WO2016052050A1 - センシングシステム - Google Patents
センシングシステム Download PDFInfo
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- WO2016052050A1 WO2016052050A1 PCT/JP2015/074737 JP2015074737W WO2016052050A1 WO 2016052050 A1 WO2016052050 A1 WO 2016052050A1 JP 2015074737 W JP2015074737 W JP 2015074737W WO 2016052050 A1 WO2016052050 A1 WO 2016052050A1
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
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- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
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- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
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Definitions
- the present invention relates to a sensing system.
- Patent Document 1 discloses a sensitive membrane array type gas detector for the purpose of obtaining long life, long-term stability and high detection accuracy.
- a plurality of gas detection elements are provided, one of which is in an operating state, and the rest are all in a non-operating state. And the function of the gas detection element made into the operation state is always checked, and when abnormality occurs, it switches to one of the other gas detection elements. Thereafter, similarly, every time an abnormality occurs in the operating gas detection element, the remaining gas detection elements are switched.
- Japanese Patent Publication Japanese Patent Laid-Open No. 11-160267 (published Jun. 18, 1999)”
- the conventional technology as described above has a configuration in which a plurality of gas detection elements for switching are prepared in advance. And it is the structure which detects that the lifetime of the gas detection element in use has expired and switches to a new gas detection element.
- the conventional technology as described above has a problem that a plurality of gas detection elements for switching must be provided.
- the present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a sensing system having a long life without requiring a plurality of gas detection elements for switching.
- a first detector for detecting a first detection target according to an aspect of the present invention, a second detector for detecting a second detection target, and the first detector
- a controller that controls the start or stop of the detection operation of the detector and the second detector, wherein the first detection object and the second detection object are detections included in the first concept.
- the control unit is configured to detect either the first detector or the second detector.
- the start, stop, or detection condition of the detection operation of the other detector is controlled according to the detection value of one of the detectors.
- the sensing system has a long life.
- (A), (b) and (c) is a figure which shows an example of the external appearance of the alcohol detection system which concerns on Embodiment 1 of this invention. It is a functional block diagram which shows the outline of a structure of the alcohol detection system which concerns on Embodiment 1 of this invention.
- (A) And (b) is an example of the graph which shows the detected value with respect to the humidity of the hygrometer and semiconductor gas sensor which concern on Embodiment 1 of this invention.
- (A) And (b) is a flowchart which shows the flow of the data processing which the control part which concerns on Embodiment 1 of this invention performs.
- FIG. 1 It is a figure which shows an example of the external appearance of the air quality monitoring system which concerns on Embodiment 2 of this invention. It is a functional block diagram which shows the outline of a structure of the air quality monitoring system which concerns on Embodiment 2 of this invention.
- (A) And (b) is a flowchart which shows the flow of the data processing which the control part which concerns on Embodiment 2 of this invention performs. Is a graph showing the sensitivity dependence on the operating temperature of the gas sensor (detected temperature) using a ZnO-SO 2 composite thin film.
- (A) And (b) is a graph which shows the gas selectivity of the semiconductor gas sensor by the presence or absence of the combination with a Pt or Pd catalyst.
- (A) And (b) is a flowchart which shows the flow of the data processing which the control part which concerns on Embodiment 4 of this invention performs. It is a functional block diagram which shows the outline of a structure of the optical sensing system which concerns on Embodiment 5 of this invention. It is a flowchart which shows the flow of the data processing which the control part which concerns on Embodiment 5 of this invention performs.
- FIG. 1 is a diagram showing an outline of a sensing system 10 according to the present invention.
- a sensing system 10 includes a first detector 1, a second detector 2, and a control unit (control means) 3.
- Detectors 1 and 2 As the first detector 1 and the second detector 2, a photodetector, a microphone, a piezoelectric element, an ammeter, a voltmeter, a tesla meter, a thermometer, an ion counter, a Geiger counter, a particle counter, a semiconductor gas sensor, an optical sensor, an SPR A (Surface plasmon resonance) sensor or the like can be used.
- the detection principle of the first detector 1 and the detection principle of the second detector 2 may be different or the same.
- a parameter directly detected by each detector is a physical parameter (detection target), a substance that changes the physical parameter is a measurement target, and the purpose of detecting the detection target is a detection purpose.
- each detector detects a change in the inspection light generated when the inspection light irradiated to the measurement target passes through the measurement target. Further, each detector detects light (fluorescence or the like) generated by irradiating the measurement target with inspection light (excitation light).
- the detection purpose is to obtain information on the state of the detection target by calculating the transmittance and wavelength shift by analyzing the physical parameters.
- the physical parameter is, for example, electromagnetic wave intensity, sound, force, current, voltage, magnetism, temperature, distance, and the like.
- the purpose of detection is to obtain information on the state of an object to be detected or to include or generate a detection target.
- the first detection object and the second detection object are detection objects included in the first concept, and are at least one type of detection included in a subordinate concept of the first concept that is common to each other. Includes subject.
- At least one of the first detection object and the second detection object includes a detection object other than the other detection object.
- Control unit 3 The control unit 3 controls the start, stop (end), or detection condition of the detection operation of the other detector in accordance with the detection value of either the first detector or the second detector. To do.
- control unit 3 determines the detection value of one detector and controls the detection start, detection stop, refresh, calibration, etc. of the other detector. Alternatively, the control unit 3 determines the detection value of one detector and sets conditions such as detection start, detection stop, refresh, and calibration of the other detector.
- the control unit 3 may be realized by a computer.
- the control unit 3 may be implemented as a control program for the sensing system 10 that causes the sensing system 10 to be realized by the computer by operating the computer as each unit included in the sensing system 10. Good.
- the control part 3 may be comprised only with the electronic circuit.
- the sensing system 10 may include a storage unit and a display unit.
- the storage unit stores, for example, the detection value of the first detector 1 and / or the detection value of the second detector 2.
- the storage unit may store content suitable for the purpose of the user who uses the sensing system 10.
- the display unit displays the detection value of the first detector 1 and / or the measurement value corresponding to the detection value of the second detector 2.
- the display unit may display content that suits the purpose of the user who uses the sensing system 10.
- sensing system operation Next, the operation of the sensing system 10 according to the present invention will be described. As the operation of the sensing system 10, there are mainly the following three.
- the control unit 3 starts the operation of the other detector.
- the first detector 1 and the second detector 2 are in operation, and the detection result of one of the detectors is controlled to be greater than or less than a certain value or less than or equal to a certain value.
- the unit 3 stops (ends) the operation of the other detector.
- At least one detector is operating, and the control unit 3 sets the detection condition of the other detector based on the detection value of the detector.
- This detection condition includes refresh and calibration.
- the sensing system 10a is an alcohol detection system 10a (sensing system).
- the alcohol detection system 10a is used to check a person's drinking level or degree of drinking.
- the alcohol detection system 10a is used as a driver's alcohol check in a vehicle.
- the purpose of detection in this embodiment is to obtain information on the ethanol concentration contained in a person's breath.
- FIG. 2A shows an example in which the alcohol detection system 10a is provided on the handle 101 of the automobile.
- FIG. 2B shows an example in which the alcohol detection system 10a is provided in the seat 102 of the automobile.
- FIG. 2C shows a schematic block diagram of the alcohol detection system 10a.
- the alcohol detection system 10a detects water vapor contained in sweating or exhalation of a person who rides with a hygrometer 1a (first detector), and in response to the detection, detects ethanol. Detection of the semiconductor gas sensor (second detector) 2a to be detected is started.
- FIG. 3 is a functional block diagram showing an outline of the configuration of the alcohol detection system 10a.
- the alcohol detection system 10a includes a hygrometer 1a, a semiconductor gas sensor 2a, a control unit 3a, a display unit 4a, and a storage unit 5a.
- the hygrometer 1a is a digital hygrometer that utilizes a change in electrical resistance by absorbing moisture.
- the hygrometer 1a detects humidity as a detection target. Here, humidity indicates the concentration of water vapor.
- the hygrometer 1a transmits the detected value to the control unit 3a.
- the semiconductor gas sensor 2a is a semiconductor gas sensor (semiconductor gas sensor, semiconductor film gas sensor).
- the semiconductor gas sensor 2a detects ethanol concentration and humidity as detection targets.
- the semiconductor gas sensor 2a transmits the detection value to the control unit 3a.
- a semiconductor gas sensor, a catalytic combustion gas sensor, an optical gas sensor, and the like detect changes in physical property parameters of a reaction film when a reaction film such as an oxide semiconductor reacts with a gas.
- a reaction film such as an oxide semiconductor reacts with a gas.
- the detection target of the semiconductor gas sensor 2a contains water vapor.
- the detection target of the hygrometer 1a and the detection target of the semiconductor gas sensor 2a are detection targets included in the first concept of gas.
- the common detection target of the hygrometer 1a and the semiconductor gas sensor 2a is the humidity included in the subordinate concept of the first concept, that is, the concentration of water vapor.
- the control unit 3a includes a detection value receiving unit 31a, a sensor operation determination unit (control unit) 32a, a display control unit 33a, and a calculation unit (calculation unit) 34a.
- the detection value receiving unit 31a receives detection values from the hygrometer 1a and the semiconductor gas sensor 2a, and transmits them to the sensor operation determination unit 32a, the display control unit 33a, the calculation unit 34a, and the storage unit 5a.
- the sensor operation determination unit 32a determines the detection value of the hygrometer 1a and / or the semiconductor gas sensor 2a, and controls the operation of the hygrometer 1a or the semiconductor gas sensor 2a.
- the display control unit 33a receives the detection values of the hygrometer 1a and the semiconductor gas sensor 2a from the detection value receiving unit 31a or the humidity and ethanol concentration calculated by the calculation unit 34a, and displays the detection value and ethanol concentration on the display control unit. Instruct to display on part 4a.
- the user can confirm whether or not the alcohol detection system 10a is functioning normally. Further, the user can operate control conditions such as the detected temperature of the semiconductor gas sensor 2a for adjusting the sensitivity of the semiconductor gas sensor 2a based on the display data, for example.
- the display control unit 33a may instruct to display only the ethanol concentration calculated based on the hygrometer 1a and the semiconductor gas sensor 2a. In addition, it may be instructed to display the alcohol level determined from the calculated ethanol concentration.
- the calculating unit 34a calculates the detected value and concentration of ethanol from the detected values of the hygrometer 1a and the semiconductor gas sensor 2a.
- the calculation unit 34a does not share the hygrometer 1a in the semiconductor gas sensor 2a except for the detection value (humidity detection value) of the detection target common to the hygrometer 1a and the semiconductor gas sensor 2a from the detection value of the semiconductor gas sensor 2a.
- the detection value of the detection target (detection value of ethanol) is set as the detection value of the semiconductor gas sensor 2a. The value is transmitted to the display control unit 33a and the storage unit 5a.
- (A) of FIG. 4 is an example of the graph which shows the detected value with respect to the humidity of the hygrometer 1a and the semiconductor gas sensor 2a.
- the calculating unit 34a calculates a difference value between the actually detected detection value (total of the detected values of ethanol and humidity) in the semiconductor gas sensor 2a and the detected value of the humidity in the semiconductor gas sensor 2a calculated as described above.
- the detected value of ethanol can be calculated by calculating the difference value.
- (B) of FIG. 4 is another example of the graph which shows the detected value with respect to the humidity of the hygrometer 1a and the semiconductor gas sensor 2a.
- the storage unit 5a stores, as a table, a graph of a relational expression between humidity and a detected value of the hygrometer 1a as shown in FIG. 4B and a graph of humidity and the semiconductor gas sensor 2a detector. It may be.
- the calculating unit 34a uses the table to calculate the degree that the specific humidity affects the detection value in the semiconductor gas sensor 2a (the detected value of the humidity in the semiconductor gas sensor 2a).
- the degree to which the humidity affects the detection value of the semiconductor gas sensor from the detection value detected by the hygrometer 1a at the specific humidity is calculated. To do.
- the detected value of ethanol of the semiconductor gas sensor 2a is calculated by calculating the difference value between the actually detected value of the semiconductor gas sensor 2a and the detected humidity value of the semiconductor gas sensor 2a calculated as described above.
- the calculation unit 34a may be configured to calculate the ethanol concentration from the detected value of the ethanol.
- the display unit 4a displays humidity, ethanol concentration, or the like in accordance with an instruction from the display control unit 33a.
- the storage unit 5a stores a correction formula and a correction coefficient used by the calculation unit 34a for calculation.
- the storage unit 5a stores a detection value of the semiconductor gas sensor 2a, a detection value of the hygrometer 1a, and the like.
- the storage unit 5a stores a control program executed by the control unit 3a.
- FIG. (A) of FIG. 5 is a flowchart which shows the flow of the data processing which the control part 3a which concerns on this embodiment performs.
- the alcohol detection system 10a starts to operate, for example, when a car door is opened, when a person is seated in the driver's seat, or when an engine is started. That is, at this time, the hygrometer 1a and the semiconductor gas sensor 2a start detection.
- the detection value receiving unit 31a receives the detection values of the hygrometer 1a and the semiconductor gas sensor 2a
- the detection value is stored in the storage unit 5a.
- the calculation unit 34a reads the detection value stored in the storage unit 5a, and calculates the humidity and the ethanol concentration excluding the influence of the humidity according to the above-described method (step S1).
- the sensor operation determination unit 32a stops the detection of the semiconductor gas sensor 2a after the ethanol concentration is calculated (step S2).
- the sensor operation determination unit 32a stops the operation of the alcohol detection system 10a when no one is present in the driver's seat or when the engine is stopped (step S3).
- step S3 the hygrometer 1a performs the detection operation continuously or at predetermined time intervals.
- the sensor operation determination unit 32a monitors the detection value of the hygrometer 1a at predetermined time intervals, and determines whether or not the amount of change in the detection value of the hygrometer 1a is within a predetermined value (step S4). .
- step S2 When the sensor operation determination unit 32a determines that the amount of change in the detected value of the hygrometer 1a is within a predetermined value (YES in step S2), the sensor operation determination unit 32a does not start the operation of the semiconductor gas sensor 2a, The process proceeds to step S3.
- step S2 When the sensor operation determination unit 32a determines that the amount of change in the detection value of the hygrometer 1a is not within a predetermined value (NO in step S2), the sensor operation determination unit 32a instructs the start of detection of the semiconductor gas sensor 2a ( Step S5). Thereafter, the process proceeds to step S1.
- step S4 If the sensor operation determination unit 32a determines that the amount of change in the detected value of the hygrometer 1a is not within a predetermined value (NO in step S4), the process proceeds to step S3.
- the alcohol detection system 10a starts to operate, for example, when a car door is opened, when a person is seated in the driver's seat, or when an engine is started. That is, at this time, the hygrometer 1a and the semiconductor gas sensor 2a start detection.
- the detection value receiving unit 31a receives the detection values of the hygrometer 1a and the semiconductor gas sensor 2a
- the detection value is stored in the storage unit 5a.
- the calculation unit 34a reads the detection value stored in the storage unit 5a, and calculates the humidity and the ethanol concentration excluding the influence of the humidity according to the method described above (step S11).
- the detection value receiving unit 31a receives the detection value from the hygrometer 1a and transmits it to the sensor operation determination unit 32a.
- the sensor operation determination unit 32a determines whether or not the detection value of the hygrometer 1a has changed abruptly (step S12). In this determination, when the amount of change in the detected value of the hygrometer 1a per predetermined time changes more than twice, or the amount of change in the detected value of the hygrometer 1a is a predetermined value (for example, detected by the semiconductor gas sensor 2a).
- the sensor operation determination unit 32a determines that the detection value of the hygrometer 1a has changed abruptly. May be.
- the sensor operation determination unit 32a determines that the detection value of the hygrometer 1a has changed abruptly (YES in step S12)
- the sensor operation determination unit 32a instructs the semiconductor gas sensor 2a to heat the reaction film. . That is, by controlling the temperature of the reaction film of the semiconductor gas sensor 2a, the semiconductor gas sensor 2a is controlled so as not to detect the humidity that is the detection target in common with the hygrometer 1a (the detection condition of the semiconductor gas sensor 2a is controlled) (step) S13).
- the reaction film may be heated until the detection value of the semiconductor gas sensor 2a becomes constant.
- the reaction may be performed at a temperature and time at which the reaction film of the semiconductor gas sensor 2a is sufficiently refreshed.
- the semiconductor gas sensor 2a may resume detection when heating to a predetermined temperature is completed, or may be detected while the reaction film is being heated.
- the detection value receiving unit 31b When the detection value receiving unit 31b receives the detection values from the hygrometer 1a and the semiconductor gas sensor 2a, the detection value receiving unit 31b transmits the detection values of the hygrometer 1a and the semiconductor gas sensor 2a to the calculation unit 34a.
- the calculation unit 34a calculates the ethanol concentration from the detection values of the hygrometer 1a and the semiconductor gas sensor 2a (step S1).
- the operation of the alcohol detection system 10a may be stopped at the time when no one is present from the driver's seat or when the engine is stopped (step S14).
- the reaction film of the semiconductor gas sensor 2a can be refreshed when the humidity becomes high. Therefore, the semiconductor gas sensor 2a can perform detection in a state where the influence of humidity immediately after refreshing is small. Further, the water vapor concentration and the ethanol concentration can be measured separately (selectively) from the detection value of the hygrometer 1a and the detection value of the semiconductor gas sensor 2a.
- the detection value of the semiconductor gas sensor 2a is not affected by humidity and detects only ethanol. As time elapses from heating of the reaction film, the reaction film of the semiconductor gas sensor 2a cools, and the detection value of the semiconductor gas sensor 2a is affected by humidity.
- the detection value of the semiconductor gas sensor 2a when the temperature of the reaction film of the semiconductor gas sensor 2a changes (decreases) under a certain humidity can be measured.
- the humidity can be calculated from the detected value of the hygrometer 1a. Therefore, the detection value of the semiconductor gas sensor 2a when the temperature of the reaction film of the semiconductor gas sensor 2a changes (decreases) under a specific humidity can be measured.
- the relationship among the humidity, the temperature of the semiconductor gas sensor 2a, and the detection value of the semiconductor gas sensor 2a can be analyzed.
- the state of the reaction film of the semiconductor gas sensor 2a is normal (sufficiently refreshed). Or whether it has deteriorated).
- the sensor operation determination unit 32a determines that the detection value of the hygrometer 1a has changed to a predetermined value or more after the detection of the semiconductor gas sensor 2a is started, the sensor operation determination unit 32a determines the temperature of the reaction film of the semiconductor gas sensor 2a. It may be instructed to maintain a temperature at which the influence of humidity is sufficiently suppressed.
- the semiconductor gas sensor 2a can detect ethanol in a state where the influence of humidity is sufficiently suppressed. That is, the hygrometer 1a can selectively detect, and the semiconductor gas sensor 2a can selectively detect ethanol.
- the alcohol detection system 10a according to the present embodiment can suppress power consumption as compared with a configuration in which the reaction film of the semiconductor gas sensor 2a is always set to a temperature at which the influence of humidity is sufficiently suppressed.
- the alcohol detection system 10a is not configured to always heat the reaction film of the semiconductor gas sensor 2a during detection. That is, the reaction film of the semiconductor gas sensor 2a is configured to be heated as necessary. Therefore, consumption of the reaction film due to heating can be reduced, and the life of the semiconductor gas sensor 2a can be extended. Therefore, the life of the alcohol detection system 10a can be extended.
- the detection of the semiconductor gas sensor 2a may be started or stopped (terminated) according to the detection value of the hygrometer 1a, or the detection condition may be controlled, or the detection value of the semiconductor gas sensor 2a may be controlled.
- the detection of the hygrometer 1a may be started, stopped (finished), or the detection condition may be controlled.
- the first detector is a semiconductor gas sensor
- the second detector is a digital hygrometer.
- the control unit 3 determines the operations of the first detector and the second detector based on the detection values of the semiconductor gas sensor as the first detector and the digital hygrometer as the second detector.
- C of FIG. 5 is a flowchart which shows the flow of the data processing which the control part 3a which concerns on this modification performs.
- the alcohol detection system 10a starts to operate when, for example, a car door is opened, when a person is seated in a driver's seat, or when an engine is started. That is, at this time, the hygrometer and the semiconductor gas sensor start detection.
- the detection value receiving unit receives the detection values of the hygrometer and the semiconductor gas sensor 2a
- the detection values are stored in the storage unit 5.
- the calculation unit 34a reads the detection value stored in the storage unit 5a, and calculates the humidity and the ethanol concentration excluding the influence of the humidity according to the method described above (step S11).
- the sensor operation determination unit 32a determines whether or not the amount of change in the detection value of the semiconductor gas sensor 2a is within a predetermined value (step S15).
- the sensor operation determination unit 32a determines that the amount of change in the detection value of the semiconductor gas sensor 2a is within a predetermined value (no change) (NO in step S15)
- the sensor operation determination unit 32a supplies the hygrometer 1a.
- An instruction to stop (end) the detection is given (step S16).
- the sensor operation determination unit 32a determines whether or not a predetermined time has elapsed from the instruction (step S17). For example, the sensor operation determination unit 32a may make the above determination with reference to a timer unit that can measure the elapsed time.
- step S17 If the sensor operation determination unit 32a determines that a predetermined time has elapsed (YES in step S17), the hygrometer 1a is instructed to start detection (step S18).
- step S14 When the person leaves the driver's seat or when the engine is stopped, the operation of the alcohol detection system 10a is also stopped (step S14).
- step S15 the process proceeds to S1.
- the sensor operation determination unit 32a determines that the amount of change in the detection value of the semiconductor gas sensor 2a is within a predetermined value. If it is determined whether or not the change amount of the detection value of the semiconductor gas sensor 2a is within a predetermined value, the operation of the hygrometer may be resumed.
- the detection value of the semiconductor gas sensor that reacts to both humidity and ethanol is monitored. Therefore, if the detection value of the semiconductor gas sensor is within a predetermined range, it can be determined that there is no fluctuation in humidity, and the hygrometer can be operated when necessary. Therefore, the usage frequency of the hygrometer can be suppressed, and the hygrometer can have a long life.
- the ethanol concentration can be accurately measured without considering the change in humidity, and the power consumption can be reduced by stopping the detection of the hygrometer 1a.
- alcohol detection system 10a was explained as an example, for example, a methane / hydrogen sensor used with a fuel cell etc. may be applied instead of semiconductor gas sensor 2a.
- the sensing system which can perform a detection without being influenced by humidity is realizable. Therefore, it is possible to operate the fuel cell, a vehicle equipped with the fuel cell, and the like more precisely, with low power consumption and low running cost.
- the reaction film may be refreshed by light irradiation.
- the sensing system according to the present embodiment is an air quality monitoring system 10b (sensing system).
- the detection purpose of the air quality monitoring system 10b is to obtain information on air quality.
- FIG. 6 is a diagram showing an example in which the air quality monitoring system 10b is mounted on the air purifier 103.
- the air cleaner 103 sucks air in the direction b1 and discharges air in the direction b2.
- the air quality monitoring system 10b may be provided in an air conditioner (not shown).
- the semiconductor gas sensor (first detector) 1b constantly detects the volatile organic compound (VOC) gas concentration, and the detection value of the semiconductor gas sensor 1b is predetermined.
- the value is equal to or greater than the value, detection of the absorptive gas sensor (second detector) 2b for detecting the concentration of the aldehyde gas is started.
- the air quality monitoring system 10b separately (selectively) measures the aldehyde-based gas and other gas concentrations separately from the detection value of the semiconductor gas sensor 1b and the absorptive gas sensor 2b.
- the air quality monitoring system 10b may be mounted on an air cleaner.
- the air cleaner when purifying toluene or xylene having a high specific gravity, the air cleaner uses an air flow that blows the exhaust from the air cleaner obliquely forward, and circulates and inhales air (toluene or xylene) close to the floor surface.
- air cleaner when purifying aldehyde-based gas that is light in specific gravity and easily collects on the ceiling, exhaust air from the air cleaner is used as a vertical air flow, air in the entire room is circulated, and aldehyde-based gas is sucked.
- FIG. 7 is a functional block diagram showing an outline of the configuration of the air quality monitoring system 10b.
- the air quality monitoring system 10b includes a semiconductor gas sensor 1b, an absorptive gas sensor 2b, a control unit 3b, a display unit 4b, and a storage unit 5b.
- the semiconductor gas sensor 1b is a semiconductor gas sensor.
- the semiconductor gas sensor 1b detects general VOC gas as a detection target.
- the semiconductor gas sensor 1b transmits the detection value to the control unit 3b.
- the absorptive gas sensor 2b is an absorptive gas sensor.
- the absorptive gas sensor 2b detects aldehyde-based gas as a detection target.
- the absorptive gas sensor 2b includes a reaction chip that changes color when contacted with an aldehyde-based gas, and a measuring instrument that measures the absorbance of the chip.
- the absorptive gas sensor 2b transmits the detection value to the control unit 3b.
- the detection target of the semiconductor gas sensor 1b and the detection target of the absorptive gas sensor 2b are detection targets included in the first concept of gas.
- the detection target common to the detection target of the semiconductor gas sensor 1b and the absorptive gas sensor 2b is an aldehyde gas included in the subordinate concept of the first concept.
- the control unit 3b includes a detection value receiving unit 31b, a sensor operation determination unit 32b, a display control unit 33b, and a calculation unit 34b.
- the detected value receiving unit 31b is the same as the detected value receiving unit 31a described in the first embodiment, a description thereof is omitted here.
- the sensor operation determination unit 32b determines the detection value of the semiconductor gas sensor 1b and / or the absorption gas sensor 2b, and controls the operation of the semiconductor gas sensor 1b or the absorption gas sensor 2b.
- the display control unit 33b receives the detection values of the semiconductor gas sensor 1b and the absorptive gas sensor 2b from the detection value receiving unit 31b, or the VOC gas concentration and aldehyde gas concentration calculated by the calculation unit 34a, and displays the values. Instruct to display on part 4b.
- the user can confirm whether the air quality monitoring system 10b is functioning normally.
- control conditions such as temporarily stopping detection or refreshing the reaction film based on the display data.
- the display control unit 33b may instruct to display only the aldehyde gas concentration calculated from the detection values of the semiconductor gas sensor 1b and the absorptive gas sensor 2b. Moreover, you may instruct
- the calculation unit 34b calculates the detection value and concentration of a gas other than the aldehyde-based gas from the detection value of the absorptive gas sensor 2b from the semiconductor gas sensor 1b. The calculated value is transmitted to the display control unit 33a and the storage unit 5a.
- the calculation unit 34b removes the detection value (detection value of aldehyde-based gas) of the detection target common to the absorptive gas sensor 2b and the semiconductor gas sensor 2a from the detection value of the semiconductor gas sensor 1b, and the absorptivity formula in the semiconductor gas sensor 1b.
- a detection value (detection value of a gas other than aldehyde gas) that is not common to the gas sensor 2b may be used as a detection value of the semiconductor gas sensor 1b.
- the method described in the calculation of the detected value of ethanol in the calculating unit 34a described in the first embodiment can be applied.
- an aldehyde gas The detection value and concentration of other gases may be calculated.
- the display unit 4b displays a detection value, a concentration, and the like for a gas other than the aldehyde-based gas among the aldehyde-based gas, the VOC gas, and the VOC gas according to the instruction of the display control unit 33b.
- the storage unit 5b stores a correction formula, a correction coefficient, a graph, and the like used for calculation by the calculation unit 34b.
- the storage unit 5b stores a detection value of the absorptive gas sensor 2b, a detection value of the semiconductor gas sensor 1b, and the like.
- the storage unit 5b stores a control program executed by the control unit 3b.
- FIG. (A) of FIG. 8 is a flowchart which shows the flow of the data processing which the control part 3b which concerns on this embodiment performs.
- the detected value receiving unit 31b receives the detected value from the semiconductor gas sensor 1b and transmits it to the sensor operation determining unit 32b.
- the sensor operation determination unit 32b determines whether or not the detection value of the semiconductor gas sensor 1b is equal to or greater than a predetermined value (step S21).
- the predetermined value may be a detection value corresponding to the lowest concentration that causes health damage to the human body in any gas that can be detected by the semiconductor gas sensor 1b.
- any of the above gases may be the most toxic gas among the gases that can be detected by the semiconductor gas sensor 1b.
- the sensor operation determination unit 32b determines that the detection value of the semiconductor gas sensor 1b is equal to or greater than a predetermined value (YES in step S21), the sensor operation determination unit 32b starts detection for the absorptive gas sensor 2b. (Step S22).
- the detection value receiving unit 31b When the detection value receiving unit 31b receives the detection values from the semiconductor gas sensor 1b and the absorbance gas sensor 2b, the detection value receiving unit 31b transmits the detection values of the semiconductor gas sensor 1b and the absorption gas sensor 2b to the calculation unit 34b.
- the calculation unit 34b calculates the concentration of a gas other than the aldehyde gas among the VOC gas, the aldehyde gas, and the VOC gas from the detection values of the semiconductor gas sensor 1b and the absorptive gas sensor 2b, and the concentration is displayed on the display unit 4b. Is done. (Step S23).
- the sensor operation determination unit 32b determines whether or not the detection value of the semiconductor gas sensor 1b is equal to or less than a predetermined target value (step S24). In this step, the sensor operation determination unit 32b monitors the detection value of the semiconductor gas sensor 1b at a predetermined time interval, and determines whether or not the amount of change in the detection value of the semiconductor gas sensor 1b is equal to or less than a predetermined value. May be. Further, the target value may be a target value set in a device on which the air quality monitoring system 10b is mounted.
- the sensor operation determination unit 32b determines that the detection value of the semiconductor gas sensor 1b is equal to or less than the predetermined target value (YES in step S24).
- the sensor operation determination unit 32b stops (ends) detection in the absorptive gas sensor 2b. (Step S25).
- the sensor operation determination part 32b receives a detection value from the semiconductor gas sensor 1b, when not determining that the value of the detection value of the semiconductor gas sensor 1b is more than a predetermined value (in step S21 NO). Thereafter, the process proceeds to step S21.
- step S24 If the sensor operation determination unit 32b does not determine that the detection value of the semiconductor gas sensor 1b is equal to or less than the predetermined target value (NO in step S24), the process proceeds to step S23.
- the absorptive gas sensor 2b requires time to initialize (refresh) the reaction chip. If the reaction film is refreshed while the absorptive gas sensor 2b is not detecting, the absorptiometric gas sensor 2b is detected at a desired timing (when the detected value of the semiconductor gas sensor 1b is equal to or higher than a predetermined value). Can be done accurately. Therefore, by mounting the air quality monitoring system 10b according to this embodiment on an air conditioner or an air purifier, the air conditioner or the air purifier can be controlled according to the accurate detection result of the air quality monitoring system 10b. Therefore, the air conditioner and the air cleaner can efficiently control the air quality in the room.
- reaction chip of the absorptive gas sensor 2b is handled as a consumable, if the absorptive gas sensor 2b is always detecting, the reaction chip is consumed in large quantities.
- the air quality monitoring system 10b can be controlled so that the absorptive gas sensor 2b detects only when necessary according to the detection value of the semiconductor gas sensor 1b. Therefore, the lifetime of the reaction chip of the absorptive gas sensor 2b is extended, and the user does not need to frequently replace the reaction chip.
- the calculation unit 34b calculates the concentration of the VOC gas, the concentration of the aldehyde gas, the concentration of a gas other than the aldehyde gas in the VOC gas, and the like from the detection values of the semiconductor gas sensor 1b and the absorption gas sensor 2b. Therefore, the air quality monitoring system 10b can separately (selectively) measure the VOC gas, the aldehyde-based gas, and the gas other than the aldehyde-based gas among the VOC gases.
- the detection speed of the semiconductor gas sensor 1b is faster than that of the absorption gas sensor 2b, the following can be said. That is, the response of the air quality monitoring system 10b is faster than that of the air quality monitoring system in which the absorptive gas sensor 2b is always detecting.
- the air quality monitoring system 10b in which the detection target is a gas is illustrated, but a water quality monitoring system in which the detection target is a component in the liquid may be used.
- FIG. 8B is a flowchart showing the flow of data processing performed by the control unit 3b according to this modification.
- the detection value receiving unit 31b receives the detection value from the absorptive gas sensor 2b and transmits it to the sensor operation determination unit 32b.
- the sensor operation determination unit 32b determines whether or not the detection value of the absorptive gas sensor 2b is equal to or greater than a predetermined value (step S31).
- the predetermined value may be a detection value corresponding to the lowest concentration that causes health damage to the human body in any gas that can be detected by the absorptive gas sensor 2b.
- any of the above gases may be the most toxic gas among the gases that can be detected by the absorptive gas sensor 2b.
- the sensor operation determination unit 32b determines that the detection value of the absorptive gas sensor 2b is equal to or greater than a predetermined value (YES in step S31), the sensor operation determination unit 32b starts detection for the semiconductor gas sensor 1b. (Step S32).
- step S23 Since step S23 has been described above, a detailed description thereof is omitted here.
- the sensor operation determination unit 32b determines whether or not the detection value of the absorptive gas sensor 2b is equal to or greater than a predetermined value (step S34).
- the sensor operation determination unit 32b determines that the detection value of the absorptive gas sensor 2b is equal to or greater than a predetermined value (YES in step S34)
- the sensor operation determination unit 32b increases the temperature of the reaction film with respect to the semiconductor gas sensor 1b. (Step S35).
- the sensor operation determination unit 32b determines whether or not the value detected by the absorptive gas sensor 2b is equal to or less than a predetermined target value (step S36). In this step, the sensor operation determination unit 32b monitors the detection value of the absorptive gas sensor 2b at a predetermined time interval, and whether or not the amount of change in the detected value of the absorptive gas sensor 2b is equal to or less than a predetermined value. It may be judged. Further, the target value may be a target value set in a device on which the air quality monitoring system 10b is mounted.
- the sensor operation determination unit 32b determines that the detection value of the absorptive gas sensor 2b is equal to or less than the predetermined target value (YES in step S36)
- the sensor operation determination unit 32b stops (ends) detection in the semiconductor gas sensor 1b. (Step S37).
- the sensor operation determination unit 32b determines that the detected value of the absorptive gas sensor 2b is not equal to or greater than a predetermined value (NO in step S31), the sensor operation determining unit 32b receives the detected value from the absorptive gas sensor 2b, and proceeds to step S31. To do.
- step S34 If the sensor operation determination unit 32b determines that the detection value of the absorptive gas sensor 2b is not equal to or greater than the predetermined target value (NO in step S34), the process proceeds to step S36.
- step S36 If the sensor operation determination unit 32b determines that the detection value of the absorptive gas sensor 2b is not less than or equal to the predetermined value (NO in step S36), the process proceeds to step S23.
- step S32a The detection of the semiconductor gas sensor 1b and the absorption gas sensor 2b starts to open (step S32a), and then the process proceeds to step S23. Since the processing from step S23 to step S36 has been described above, a description thereof is omitted here.
- the sensor operation determination unit 32b determines that the detection value of the absorptive gas sensor 2b is equal to or less than a predetermined value (YES in step S36), the sensor operation determination unit 32b decreases the detection temperature of the semiconductor gas sensor (step S37a). .
- step S23 Since step S23 has been described above, a detailed description thereof is omitted here.
- the sensor operation determination unit 32b determines whether there is an end instruction from the user (step S38a). If there is an end instruction from the user (YES in step S38a), the detection of the semiconductor gas sensor 1b and the absorptive gas sensor 2b is ended. When there is no end instruction from the user (NO in step S38a), the process proceeds to step S23.
- FIG. 9 is a graph showing the sensitivity dependence on the operating temperature (detection temperature) of the gas sensor using the ZnO—SO 2 composite thin film disclosed in Non-Patent Document 1.
- FIG. 10A is a graph showing the gas selectivity at 200 ° C. of the semiconductor gas sensor with or without the combination with the Pt or Pd catalyst shown in Non-Patent Document 2.
- FIG. 10B is a graph showing the gas selectivity at 200 ° C. of the semiconductor gas sensor with or without the combination with the Pt or Pd catalyst shown in Non-Patent Document 2.
- the sensitivity of the semiconductor gas sensor to the detection gas varies depending on the detection temperature. Therefore, the selectivity of the detection target of the semiconductor gas sensor 1b can be changed by adjusting the temperature of the reaction film of the semiconductor gas sensor 1b and adjusting the detection temperature.
- the semiconductor gas sensor 1b can be controlled so that the control unit 3 hardly detects an aldehyde-based gas on the same principle as the selectivity of the semiconductor gas sensor described above.
- the sensor operation determination unit 32b may stop the detection of the absorptive gas sensor 2b when the detection value of the semiconductor gas sensor 1b becomes a constant value.
- the timing at which detection of the absorptive gas sensor 2b is started next may be determined according to the amount of change in the detection value of the semiconductor gas sensor 1b.
- other operating conditions set temperature, detection target flow velocity, applied voltage, etc. may be determined according to the detection value of the semiconductor gas sensor 1b.
- the above operating conditions affect the detection sensitivity, lifetime, power consumption, etc. of the absorptive gas sensor 2b.
- the air quality monitoring system 10b determines the operating conditions of these absorptive gas sensors 2b according to the detection value of the semiconductor gas sensor 1b. Therefore, the detection sensitivity of the absorptive gas sensor 2b, the usage period of the absorptive gas sensor 2b, the period until refreshing, the power consumption of the absorptive gas sensor 2b, the running cost of the absorptive gas sensor 2b, the absorptive gas sensor 2b From the standpoint of reducing consumption, an optimal detection condition for the absorptive gas sensor 2b can be set.
- FIG. 11 is a diagram illustrating an example in which the gas sensing system 10 c is mounted on the automobile 104. That is, the detection purpose of the gas sensing system 10c is to obtain information on the exhaust gas concentration of the automobile 104.
- the first semiconductor gas sensor (first detector) 1c whose detection condition is set to 200 ° C. always detects the gas concentrations of CO, NO, and NO 2.
- the detection value of the first semiconductor gas sensor 1c becomes a predetermined value or more
- the detection of the second semiconductor gas sensor 2c (second detector) in which the detection condition for detecting CO is set to 400 ° C.
- the gas sensing system 10c has a configuration in which a detector based on the same detection principle detects a detection target based on different detection conditions.
- a detector based on the same detection principle detects a detection target based on different detection conditions.
- the sensitivity dependency of the detection target differs depending on the operating temperature (detection temperature).
- the CO detection value of the gas sensing system 10c is high, it is fed back to the detected gas generation source. For example, if the detected gas with a high detection value is CO, there is a possibility of incomplete combustion of the fuel.
- the gas sensing system 10c transmits information indicating that the CO concentration is high, for example, to the combustion control device 20 that controls the combustion of fuel. Therefore, the combustion control device 20 can perform control such as diluting the fuel in accordance with the information.
- FIG. 12 is a functional block diagram showing an outline of the configuration of the gas sensing system 10c.
- the gas sensing system 10c includes a first semiconductor gas sensor 1c, a second semiconductor gas sensor 2c, a control unit 3c, a display unit 4c, and a storage unit 5c.
- the first semiconductor gas sensor 1c is a semiconductor gas sensor whose detection condition is set to 200 ° C. As shown in FIG. 9, the first semiconductor gas sensor 1c uses NO, NO 2 , and CO as detection targets. The first semiconductor gas sensor 1c transmits the detection value to the control unit 3c.
- the second semiconductor gas sensor 2c is a semiconductor gas sensor whose detection condition is set to 400 ° C. As shown in FIG. 9, the second semiconductor gas sensor 2c uses CO as a detection target. The second semiconductor gas sensor 2c transmits the detection value to the control unit 3c.
- the detection target of the first semiconductor gas sensor 1c and the detection target of the second semiconductor gas sensor 2c are detection targets included in the first concept of gas.
- a common detection target of the first semiconductor gas sensor 1c and the second semiconductor gas sensor 2c is CO included in the subordinate concept of the first concept.
- the control unit 3c includes a detection value acquisition unit 31c, a sensor operation determination unit 32b, a display control unit 33b, a calculation unit 34c, and a gas concentration determination unit 35c.
- the detection value acquisition unit 31c receives detection values from the first semiconductor gas sensor 1c and the second semiconductor gas sensor 2c, and sensor operation determination unit 32c, display control unit 33c, calculation unit 34c, gas concentration determination unit 35c, and storage unit 5c. Send to.
- the sensor operation determination unit 32c determines the detection value of the first semiconductor gas sensor 1c and / or the second semiconductor gas sensor 2c, and controls the operation of the first semiconductor gas sensor 1c or the second semiconductor gas sensor 2c.
- the display control unit 33c receives the detection values of the first semiconductor gas sensor 1c and the second semiconductor gas sensor 2c or the CO gas concentration calculated by the calculation unit 34c from the detection value acquisition unit 31c, and displays the values as display units. 4c is instructed to be displayed.
- the user can confirm whether or not the gas sensing system 10c is functioning normally.
- the user can operate a vehicle control condition such as an accelerator / brake operation based on the display data.
- the display control unit 33c may display only the CO concentration, or may display the state of combustion determined from the CO concentration.
- the calculation unit 34c calculates a detection value and CO concentration of a gas other than CO among gases detected by the first semiconductor gas sensor 1c from the detection value of the second semiconductor gas sensor 2c. The calculated value is transmitted to the gas concentration determination unit 35c, the display control unit 33c, and the storage unit 5c.
- the calculation unit 34c removes from the detection value of the first semiconductor gas sensor 1c the detection value (the detection value of CO concentration) of the detection target common to the second semiconductor gas sensor 2c and the first semiconductor gas sensor 1c.
- a detection value detection value of a gas other than CO
- a detection value detection value of a gas other than CO
- the gas concentration determination unit 35c determines whether the concentration of CO received from the calculation unit 34c is equal to or higher than a predetermined value.
- the gas concentration determination unit 35c may determine whether or not the detection value of the second semiconductor gas sensor 2c is equal to or greater than a predetermined value. If the calculated value or the detected value is equal to or greater than a predetermined value, high concentration CO information indicating that CO is higher than the predetermined concentration is transmitted to the combustion control device 20.
- the display unit 4c displays a detection value for the first semiconductor gas sensor 1c and the second semiconductor gas sensor 2c, a concentration calculated from the detection value, and the like according to an instruction from the display control unit 33c.
- the storage unit 5c stores a correction formula, a correction coefficient, a graph, and the like used for calculation by the calculation unit 34c.
- the storage unit 5c stores detection values of the first semiconductor gas sensor 1c and the second semiconductor gas sensor 2c.
- the storage unit 5c stores a control program executed by the control unit 3c.
- FIG. 13 is a flowchart which shows the flow of the data processing which the control part 3c which concerns on this embodiment performs.
- the detection value acquisition unit 31c receives the detection value from the first semiconductor gas sensor 1c and transmits it to the sensor operation determination unit 32c.
- the sensor operation determination unit 32c determines whether or not the detection value of the first semiconductor gas sensor 1c is greater than or equal to a predetermined value (step S41).
- the predetermined value may be a detection value corresponding to the lowest concentration at which CO causes a health hazard on the human body.
- the sensor operation determination unit 32c determines that the detection value of the first semiconductor gas sensor 1c is equal to or greater than a predetermined value (YES in step S41), the sensor operation determination unit 32c detects the second semiconductor gas sensor 2c. Is instructed to start (step S42).
- step S42 when the sensor operation determination unit 32c instructs the second semiconductor gas sensor 2c to start detection, the sensor operation determination unit 32c determines whether or not a predetermined time has elapsed from the instruction (step S43). ). For example, the sensor operation determination unit 32c may make the above determination with reference to a timer unit that can measure the elapsed time.
- the predetermined time is equal to or longer than the time when the operation of the second semiconductor gas sensor 2c is stable and the generation of CO gas can be accurately detected.
- the predetermined time may be set with reference to the detection result of the CO gas.
- the predetermined time is a sufficient time for detecting the generation of CO gas such that the concentration of CO gas is stabilized or the average value of fluctuation can be determined.
- the predetermined time is a time during which the power consumption of the second semiconductor gas sensor 2c can be suppressed as much as possible.
- the sensor operation determination unit 32c determines that the predetermined time has not elapsed since the detection start instruction of the second semiconductor gas sensor 2c (NO in step S43), the sensor operation determination unit 32c detects the second semiconductor gas sensor 2c is not instructed to stop (end) detection.
- the calculation unit 34c calculates the concentrations of CO and gases other than CO from the detection values of the first semiconductor gas sensor 1c and the second semiconductor gas sensor 2c received from the detection value acquisition unit 31c.
- the calculation unit 34c transmits the calculated CO and gas concentrations other than CO to the gas concentration determination unit 35c (step S44).
- the gas concentration determination unit 35c determines whether or not the received CO concentration is equal to or higher than a predetermined value (step S45).
- step S45 When the gas concentration determination unit 35c determines that the received CO concentration is equal to or higher than the predetermined value (YES in step S45), the gas concentration determination unit 35c transmits high concentration CO information to the combustion control device 20 (step S45). S46). Thereafter, the process proceeds to step S43.
- the sensor operation determination unit 32c determines that the detection value of the first semiconductor gas sensor 1c is not equal to or greater than the predetermined value (NO in step S41), the sensor operation determination unit 32c receives the detection value from the first semiconductor gas sensor 1c, and step S41. Migrate to
- step S45 If the gas concentration determination unit 35c does not determine that the received CO concentration is equal to or higher than the predetermined value (NO in step S45), the process proceeds to step S43.
- step S47 when the sensor operation determination unit 32c determines that a predetermined time has elapsed since the instruction to start the second semiconductor gas sensor 2c (YES in step S43), the sensor operation determination unit 32c An instruction to stop (end) the detection of the gas sensor 2c is given (step S47).
- the first semiconductor gas sensor 1c and the second semiconductor gas sensor 2c are semiconductor gas sensors having the same detection principle. Therefore, it is possible to reduce the processing amount of the control processing of the two detectors. Therefore, the control unit 3c can be simplified.
- the gas sensing system 10c starts selective detection of the second semiconductor gas sensor 2c for detecting a specific gas in accordance with detection values for the plurality of gases of the first semiconductor gas sensor 1c.
- the first semiconductor gas sensor 1c has a higher response speed than the second semiconductor gas sensor 2c, the following can be said. That is, the response of the gas sensing system 10c is faster than the gas sensing system in which the second semiconductor gas sensor 2c is always detecting.
- FIG. 13B is a flowchart showing the flow of data processing performed by the control unit 3b according to this modification.
- step S41, step S42 and step S43 have been described above, description thereof is omitted here.
- step S43 when the sensor operation determination unit 32c determines that a predetermined time has not elapsed since the detection start instruction of the second semiconductor gas sensor 2c (NO in step S43), the sensor The operation determination unit 32c does not instruct the second semiconductor gas sensor 2c to stop (end) detection, and proceeds to step S53.
- the sensor operation determination unit 32c sets the detection condition of the second semiconductor gas sensor 2c according to the detection value of the second semiconductor gas sensor 2c received from the detection value acquisition unit 31c.
- the sensor operation determination unit 32c instructs the second semiconductor gas sensor 2c to perform detection under the set detection conditions (step S53).
- the second semiconductor device increases the CO detection sensitivity.
- the temperature of the reaction film of the gas sensor 2c is adjusted. For example, as shown in FIG. 9, the detection sensitivity to CO is higher when the reaction film is 300 ° C. than when the reaction film of the second semiconductor gas sensor 2 c is 400 ° C. Further, even when the reaction membrane is at 300 ° C., the specificity of detection for CO can be maintained. Therefore, the sensor operation determination unit 32c may instruct the reaction film of the second semiconductor gas sensor 2c to be 300 ° C.
- the sensor operation determination unit 32c sets the detection time longer when it is determined that the detection value of the second semiconductor gas sensor 2c is low, and sets the detection time short when it is determined that the detection value of the second semiconductor gas sensor 2c is high.
- the second semiconductor gas sensor 2c receives the detection condition instruction and performs detection under the set detection condition (step S54). Thereafter, the process proceeds to step S44.
- step S44, step S45, step S46, and step S47 have been described above, description thereof is omitted here.
- operating conditions set temperature, flow velocity to be detected, applied voltage, etc.
- other operating conditions set temperature, flow velocity to be detected, applied voltage, etc.
- the above operating conditions affect the detection sensitivity, life, power consumption, etc. of the second semiconductor gas sensor 2c.
- the gas sensing system 10c determines the operating conditions of the second semiconductor gas sensor 2c according to the detection value of the first semiconductor gas sensor 1c. Therefore, the detection sensitivity of the second semiconductor gas sensor 2c, the period until the second semiconductor gas sensor 2c is refreshed, the power consumption of the second semiconductor gas sensor 2c, the running cost of the second semiconductor gas sensor 2c, the second semiconductor gas sensor From the viewpoint of suppressing the consumption of 2c and the like, it is possible to set an optimal detection condition for the second semiconductor gas sensor 2c.
- the second semiconductor gas sensor 2c has properties such as shorter life than the first semiconductor gas sensor 1c, high power consumption, high running cost, a consumable part, and difficulty in initialization (refresh), the gas In the sensing system 10c, the detection of the second semiconductor gas sensor 2c can be controlled under detection conditions that suppress the disadvantages of the second semiconductor gas sensor 2c as much as possible.
- the sensor operation determination unit 32c changes the temperature of the reaction film of the second semiconductor gas sensor 2c from 400 ° C. to 300 ° C., for example, according to the detection value of the second semiconductor gas sensor 2c received from the detection value acquisition unit 31c. Instruct to lower. Therefore, as described above, the detection sensitivity for CO can be increased while maintaining the specificity of detection for CO. Furthermore, power consumption can be reduced by lowering the detection temperature of the second semiconductor gas sensor 2c.
- the target of a gas sensing system is not limited to CO.
- a gas sensing system targeting a gas other than CO can be realized by appropriately changing the types and detection conditions of the first semiconductor gas sensor 1c and the second semiconductor gas sensor 2c reaction film.
- the gas sensing system 10c for detecting the exhaust gas of the automobile is exemplified, but the present invention may be applied to a system for detecting an organic gas such as ethylene mercaptan generated from food in the refrigerator.
- the gas sensing system using the detection target as a gas is exemplified, but the present invention may be applied to a water quality monitoring system using the detection target as a component in the liquid.
- the following configuration can be applied to the heating of the reaction film of the semiconductor gas sensor in the first embodiment, the second embodiment, and the third embodiment.
- the detection condition is the light intensity for heating the reaction film.
- the sensing system according to the present embodiment is an optical sensing system 10d (sensing system) whose detection purpose is to obtain information on the presence and state of a substance from light transmission, reflection, absorption, scattering, and emission spectrum.
- FIG. 14 (a) and 14 (b) are views showing the appearance of the optical sensing system 10d.
- the optical sensing system 10d irradiates the leaf 120 with light from the light source 110 using an optical fiber.
- the optical sensing system 10d detects light (transmitted light) transmitted through the leaves 120.
- the optical sensing system 10d irradiates the leaf 120 with light from the light source 110 using the lens 115.
- the optical sensing system 10 d detects the light transmitted through the leaf 120 using the lens 115.
- the state of the leaf 120 can be analyzed by the optical sensing system 10d.
- the optical sensing system 10d may be configured to detect reflected or scattered light.
- FIG. 15 is a functional block diagram showing an outline of the configuration of the optical sensing system 10d.
- the optical sensing system 10d includes a Si photodetector (first detector) 1d, a spectroscope (second detector) 2d, a control unit 3d, a display unit 4d, and a storage unit 5d. .
- the Si photodetector 1d detects light in a red to infrared wavelength range (for example, 600 nm to 1100 nm) as a detection target.
- the Si photodetector 1d transmits the detection value to the control unit 3d.
- the spectroscope 2d detects a wavelength range (for example, 300 nm to 750 nm) in the ultraviolet to near infrared region as a detection target.
- the spectroscope 2d transmits the detection value to the control unit 3d.
- the detection target of the Si photodetector 1d and the detection target of the spectroscope 2d are detection targets included in the first concept of light intensity.
- a common detection target of the Si photodetector 1d and the spectroscope 2d is the light intensity at a wavelength of 600 nm to 750 nm included in the subordinate concept of the first concept.
- the control unit 3d includes a detection value acquisition unit 31d, a sensor operation determination unit 32d, a display control unit 33d, and a calculation unit 34d.
- the detection value acquisition unit 31d receives the detection values from the Si photodetector 1d and the spectroscope 2d and transmits them to the sensor operation determination unit 32d, the display control unit 33d, the calculation unit 34d, and the storage unit 5d.
- the sensor operation determination unit 32d determines the detection value of the Si photo detector 1d and / or the spectroscope 2d, and controls the detection operation of the Si photo detector 1d or the spectroscope 2d.
- the display control unit 33d receives the detection values of the Si photodetector 1d and the spectroscope 2d or the light intensity of the wavelength calculated by the calculation unit 34d from the detection value acquisition unit 31d, and the display control unit receives the detection value and the light of each wavelength. Instructs the display unit 4d to display the intensity.
- the user can confirm whether or not the optical sensing system 10d is functioning normally by viewing the display unit 4d.
- the user can operate a control condition such as a wavelength range to be measured based on display data (detection value and each wavelength) displayed on the display unit 4d.
- the display control unit 33d may instruct the display unit 4d to display the light intensity calculated from the detection values of the Si photodetector 1d and the spectroscope 2d. Moreover, you may instruct
- the calculation unit 34d calculates a detection value of light intensity with a wavelength of 750 to 1100 nm from detection values of the Si photodetector 1d and the spectroscope 2d. The calculated value is transmitted to the display control unit 33a and the storage unit 5a.
- the calculation unit 34d removes the detection value (600 to 750 nm) of the detection target common to the Si photodetector 1d and the spectroscope 2d from the detection value of the Si photo detector 1d, and the detection target not common to the spectroscope 2d in the Si photo detector 1d.
- This detection value (detection value of 750 to 1100 nm) may be the detection value of the Si photodetector 1d.
- the calculation method described in the calculation of the detection value of ethanol in the calculation unit 34a described in the first embodiment can be applied to the calculation of the detection value of the detection value of the light intensity having a wavelength of 750 to 1100 nm.
- the detection value of the hygrometer 1a in the calculation of the detection value of ethanol in the first embodiment is replaced with the detection value obtained by integrating the spectroscope 2d with respect to 600 nm to 750 nm, and the detection value of the semiconductor gas sensor 2a in the first embodiment is replaced with that of the Si photodetector 1d.
- the integrated detection value and the light intensity of the light intensity of the wavelength of 750 to 1100 nm may be calculated.
- integrated detection value and “integrated detection value” are obtained in a certain wavelength region when the horizontal axis is the optical wavelength, the vertical axis is the optical intensity, and the detection value of the spectrometer is displayed as a chart. It is the integrated value of light intensity.
- the storage unit 5d stores a correction formula, a correction coefficient, a graph, and the like used by the calculation unit 34d for calculation.
- the storage unit 5d stores detection values of the Si photodetector 1d and the spectroscope 2d.
- the storage unit 5d stores a control program executed by the control unit 3d.
- FIG. 16A is a flowchart illustrating the flow of data processing performed by the control unit 3d according to the present embodiment.
- the detection value acquisition unit 31d receives the detection value from the Si photodetector 1d and transmits it to the sensor operation determination unit 32d.
- the sensor operation determination unit 32d determines whether or not the detection value of the Si photo detector 1d has changed (step S61). For example, in the above determination, when the amount of change in the detected value of the Si photodetector 1d per predetermined time has changed more than twice, or there has been a change of 10% or more of the detected value at the start of detection of the Si photodetector 1d. In this case, it may be determined that the detection value of the Si photodetector 1d has changed.
- the sensor operation determination unit 32d determines that the detection value of the Si photodetector 1d has changed (YES in step S61), the sensor operation determination unit 32d instructs the spectroscope 2d to start detection (step S62). ).
- the detection value acquisition unit 31d When the detection value acquisition unit 31d receives the detection values from the Si photo detector 1d and the spectroscope 2d, the detection value acquisition unit 31d transmits the detection values of the Si photo detector 1d and the spectroscope 2d to the calculation unit 34d.
- the calculating unit 34d calculates the light intensity at a wavelength of 750 to 1100 nm from the detection values of the Si photodetector 1d and the spectroscope 2d (step S63).
- the sensor operation determination unit 32d monitors the detection value of the Si photo detector 1d at a predetermined time interval, and determines whether or not the amount of change in the detection value of the Si photo detector 1d is within a predetermined value (step S64). .
- the sensor operation determination unit 32d determines that the amount of change in the detection value of the Si photodetector 1d is within a predetermined value (YES in step S64), the sensor operation determination unit 32d stops (ends) detection in the spectrometer 2d. To instruct.
- the detection value acquisition unit 31d receives the detection value from the Si photo detector 1d, Control goes to step S61.
- step S64 If the sensor operation determination unit 32d determines that the amount of change in the detection value of the Si photodetector 1d is not within a predetermined value (NO in step S64), the process proceeds to step S63.
- the detection of the spectroscope 2d starts when it is determined that the detection value of the Si photodetector 1d has changed.
- the change in the detection value of the Si photodetector 1d means a state in which light of a specific wavelength is transmitted, reflected, absorbed, scattered, or emitted from a substance. That is, in the configuration of the present embodiment, detection of the spectroscope 2d is started when light of a specific wavelength enters a state of being transmitted, reflected, absorbed, scattered, or emitted from a substance. Since the spectrum measurement is possible in the spectroscope 2d, detailed analysis is possible. Therefore, the spectroscope 2d can be started only when detailed analysis of the spectroscope 2d is necessary. Thereby, the power consumption of the optical sensing system 10d can be reduced. Further, the spectroscope 2d need not always perform detection. Therefore, it is possible to suppress wear that occurs according to the detection time. That is, the sensing system can have a long life.
- the sensor operation determination unit 32d may set the detection conditions (measurement time, set temperature, applied voltage, etc.) of the spectrometer 2d from the detection values of the Si photodetector 1d.
- the applied voltage may be adjusted from the detection value of the Si photodetector 1d so that the detection sensitivity of the spectroscope 2d becomes an appropriate sensitivity. Thereby, there is no possibility that the spectroscope 2d is destroyed by an input exceeding the detection limit.
- the sensor operation determination unit 32d may determine a time zone for detecting the spectroscope 2d from the detection value of the Si photodetector 1d.
- the detection conditions described above affect the detection sensitivity, lifetime, power consumption, etc. of the spectrometer 2d. Therefore, in the optical sensing system 10d, by determining the detection conditions described above from the detection value of the Si photodetector 1d, the detection sensitivity of the spectrometer 2d, the usage period of the spectrometer 2d, or the period until refreshing, the power consumption From the viewpoints of running cost, reduction of wear, etc., it is possible to set the optimal detection conditions for the spectrometer 2d.
- the light intensity in the red to infrared wavelength range detected by the Si photodetector 1d changes.
- the sensor operation determination unit 32d starts detection by the spectroscope 2d. By checking the spectrum of 600 nm to 750 nm from the detection value of the spectroscope 2d, the user can determine whether the change in light intensity in the red to infrared wavelength range is due to the shift of the absorption peak. It is possible to analyze whether or not it is derived from the fact that the change has occurred.
- the change in the plasmon absorption peak will be known, and the optical constant change around the metal fine particle or the metal fine particle It is possible to detect a change in the shape. Thereby, it becomes a gas sensor or a liquid sensor using a plasmon absorption peak.
- the change in the optical constant around the metal fine particles and the substance that causes the shape change of the metal fine particles are targets for detecting the change in the material state, and the detection purpose is to obtain information on the concentration of the gas or liquid. The same applies to a substance having an emission peak specific to red.
- the emission is fluorescence
- detection by the spectroscope 2d can be started, a spectrum of 300 nm to 750 nm can be measured, and the relative ratio between the intensity of the excitation wavelength and the intensity of the fluorescence wavelength can be analyzed.
- the Si photodetector 1d is replaced with a spectroscope capable of detecting a wavelength range of ultraviolet to infrared (eg, 300 nm to 1100 nm), and the spectroscope 2d detects light of a red to infrared wavelength range (eg, 600 nm to 1100 nm).
- a possible Si photo detector may be used instead.
- the Si photodetector 1d is replaced with a Si photodetector capable of detecting light in the red to infrared wavelength range (eg, 600 nm to 1100 nm), and the spectroscope 2d is changed to an ultraviolet to infrared wavelength range (eg, 300 nm to 1100 nm). May be replaced with a spectroscope capable of detecting.
- the sensor operation determination unit 32d determines the detection operation of the other detector according to the detection value of the one detector.
- optical sensing system 10d may be mounted on a system that detects gas emitted from the leaves of a plant, a system that detects components of liquid fertilizer, a system that detects fluorescence of leaves, and the like.
- the optical sensing system 10d when detecting a gradual change such as a leaf growth state or moisture content, it is not necessary for all the detectors provided in the optical sensing system to always detect. Therefore, it is effective to apply the optical sensing system 10d according to the present embodiment.
- the optical sensing system that detects the light intensity is exemplified, but it may be a sensing system for other continuous physical parameters (detection targets) such as vibration, sound, radiation, and electronic energy.
- the first detector is a spectroscope 2d capable of detecting a wavelength range of ultraviolet to infrared (eg, 300 nm to 1000 nm), and the second detector is a wavelength range of red to infrared (eg, 600 nm).
- the Si photodetector 1d capable of detecting light of ⁇ 1100 nm).
- the present modification corresponds to a system that determines the operation of the first detector based on the second detection result.
- FIG. 16B is a flowchart showing the flow of data processing performed by the control unit 3d according to this modification.
- the Si photodetector 1d and the spectroscope 2d start to operate together when the user starts the operation of the optical sensing system 10d.
- the sensor operation determination unit 32d monitors the detection value of the spectroscope 2d at a predetermined time interval, and determines whether or not the detection value of the spectroscope 2d has changed. (Step S71).
- the sensor operation determination unit 32d determines that the detection value of the spectrometer 2d has changed (YES in step S71)
- the sensor operation determination unit 32d determines that the amount of change in the detection value of the Si photodetector 1d is within a predetermined value. It is determined whether or not there is (step S72).
- the sensor operation determination unit 32d instructs the Si photodetector 1d to stop (end) detection (step S73). .
- the calculation unit 34d calculates the spectrum of 300 nm to 1000 nm and the light intensity of 1000 nm to 1100 nm from the detection results of the Si photodetector 1d and the spectroscope 2d (step S74), and then proceeds to step S71.
- a time during which the detection of the Si photodetector 1d is stopped can be provided. Therefore, the power consumption of the optical sensing system 10d can be reduced.
- Modification 2 Next, a modified example of the data processing flow performed by the control unit 3d will be described with reference to FIG. (C) of FIG. 16 is a flowchart which shows the flow of the data processing which the control part 3d which concerns on this modification performs.
- the Si photodetector 1d and the spectroscope 2d start to operate together when the user starts the operation of the optical sensing system 10d.
- the sensor operation determination unit 32d monitors the detection value of the spectroscope 2d at a predetermined time interval, and determines whether or not the detection value of the spectroscope 2d has changed. (Step S71).
- the calculation unit 34d calculates an integrated value of the change amount (step S75).
- the sensor operation determination unit 32d determines whether the change amount of the detection value of the Si photodetector 1d is equal to the integral value of the change amount of the spectroscope 2d calculated by the calculation unit 34d (step S76). When it is determined that the amount of change in the detection value of the Si photodetector 1d is equal to the amount of change in the spectroscope 2d calculated by the calculation unit 34d and the integral value (YES in step S76), the sensor operation determination unit 32d detects that the spectroscope 2d A stop (end) is instructed (step S77).
- the detection value acquisition unit 31d acquires the detection value only from the Si photodetector 1d (step S78). Thereafter, the process proceeds to step S71.
- the sensor operation determination unit 32d determines that the detection value of the spectroscope 2d has not changed, or the change amount of the detection value of the Si photodetector 1d is integrated with the change amount of the spectroscope 2d calculated by the calculation unit 34d.
- the calculation unit 34d calculates the spectrum of 300 nm to 1000 nm and the light intensity of 1000 nm to 1100 nm from the detection results of the Si photodetector 1d and the spectroscope 2d ( Step S79). Thereafter, the process proceeds to step S71.
- data processing shown in the present modification may be configured to end upon receiving an instruction to end data processing from the user.
- the Si photodetector 1d and the spectroscope 2d determine that they are measuring a change in a common detection target, a time during which the detection of the spectroscope 2d is stopped is provided. Can do. Therefore, the power consumption of the optical sensing system 10d can be reduced.
- the sensing system is an optical sensing system 10e (sensing system 10) whose detection purpose is to obtain information on the presence and state of a substance from light transmission, reflection, absorption, scattering, and emission spectrum. .
- optical sensing system 10e An example of the appearance of the optical sensing system 10e is the same as the optical sensing system 10d shown in the fourth embodiment. Therefore, the description here is omitted.
- FIG. 17 is a functional block diagram showing an outline of the configuration of the optical sensing system 10e.
- the optical sensing system 10e includes a first Si photodetector 1e (first detector), a second Si photodetector 2e (second detector), a control unit 3e, a display unit 4e, and a storage. A portion 5e is provided.
- the first Si photodetector 1e detects light in a red to infrared wavelength range (for example, 600 nm to 1000 nm) as a detection target.
- the first Si photodetector 1e transmits the detection value to the control unit 3e.
- the second Si photodetector 2e detects a specific wavelength range (for example, 600 nm to 700 nm) as a detection target.
- the second Si photodetector 2e transmits the detection value to the control unit 3e.
- the second Si photodetector 2e is configured to include a bandpass filter that transmits only a specific wavelength range.
- the detection target of the first Si photodetector 1e and the detection target of the second Si photodetector 2e are detection targets included in the first concept of light intensity.
- the common detection target of the first Si photodetector 1e and the second Si photodetector 2e is the light intensity of a wavelength of 600 nm to 700 nm included in the subordinate concept of the first concept.
- the first Si photodetector 1e may be a Si photodetector with a band-pass filter, and the second Si photodetector 2e.
- the control unit 3e includes a detection value acquisition unit 31e, a sensor operation determination unit 32e, a display control unit 33e, and a calculation unit 34e.
- the detection value acquisition unit 31e receives detection values from the first Si photo detector 1e and the second Si photo detector 2e, and transmits them to the sensor operation determination unit 32e, the display control unit 33e, the calculation unit 34e, and the storage unit 5e.
- the sensor operation determination unit 32e determines the detection value of the first Si photo detector 1e and / or the second Si photo detector 2e, and controls the detection operation of the first Si photo detector 1e or the second Si photo detector 2e. .
- the display control unit 33e receives the detection value of the first Si photo detector 1e or the second Si photo detector 2e or the light intensity calculated by the calculation unit 34e from the detection value acquisition unit 31e, and the display control unit 33 The display unit 4e is instructed to display the light intensity in each wavelength region.
- the user can confirm whether or not the optical sensing system 10e is functioning normally. Further, the user can operate control conditions such as sensitivity of each photo detector by adjusting circuit constants connected to the first Si photo detector 1e and / or the second Si photo detector 2e based on the display data.
- the display control unit 33e may instruct to display the light intensity calculated from the detection values of the first Si photo detector 1e and the second Si photo detector 2e.
- the leaf growth state and the amount of water determined from the detection values of the first Si photodetector 1e and the second Si photodetector 2e may be displayed.
- the calculation unit 34e calculates a detection value of light intensity with a wavelength of 700 to 1000 nm from the detection values of the first Si photodetector 1e and the second Si photodetector 2e. The calculated value is transmitted to the display control unit 33a and the storage unit 5a.
- the calculation unit 34e removes the detection value (600 to 700 nm) of the detection target common to the first Si photodetector 1e and the second Si photodetector 2e from the detection value of the first Si photodetector 1e.
- the detection value of the detection target (detection value of 700 to 1000 nm) that is not common to the second Si photodetector 2e in the Si photodetector 1e may be used as the detection value of the Si photodetector 1e.
- the calculation method described in the calculation of the detection value of ethanol in the calculation unit 34a described in the first embodiment can be applied to the calculation of the detection value of the detection value of the light intensity having a wavelength of 700 to 1000 nm.
- the detection value of the hygrometer 1a in the calculation of the detection value of ethanol of the first embodiment is replaced with the detection value of the second Si photodetector 2e, and the detection value of the semiconductor gas sensor 2a of the first embodiment is changed to that of the first Si photodetector 1e.
- the detection value and the light intensity of the light intensity at a wavelength of 700 to 1000 nm may be calculated.
- the storage unit 5e stores a correction formula, a correction coefficient, a graph, and the like used for calculation by the calculation unit 34e.
- the storage unit 5e stores detection values of the first Si photo detector 1e and the second Si photo detector 2e.
- the storage unit 5e stores a control program executed by the control unit 3e.
- FIG. 18 is a flowchart showing the flow of data processing performed by the control unit 3e according to this embodiment.
- the detection value acquisition unit 31e receives the detection value from the first Si photodetector 1e and transmits it to the sensor operation determination unit 32e.
- the sensor operation determination unit 32e determines whether or not the detection value of the first Si photodetector 1e has changed (step S81). For example, in the above determination, when the amount of change in the detection value of the first Si photodetector 1e per predetermined time changes by more than twice, or 10% of the detection value at the start of detection of the first Si photodetector 1e. When the above change has occurred, it may be determined that the detection value of the first Si photodetector 1e has changed.
- the sensor operation determination unit 32e determines that the detection value of the first Si photodetector 1e has changed (YES in step S81).
- the sensor operation determination unit 32e starts detection with respect to the second Si photodetector 2e. (Step S82).
- the detection value acquisition unit 31e When the detection value acquisition unit 31e receives detection values from the first Si photo detector 1e and the second Si photo detector 2e, the detection value acquisition unit 31e transmits the detection values of the first Si photo detector 1e and the second Si photo detector 2e to the calculation unit 34e. .
- the calculating unit 34e calculates the light intensity with a wavelength of 700 to 1000 nm from the detection values of the first Si photodetector 1e and the second Si photodetector 2e (step S83).
- the sensor operation determination unit 32e monitors the detection value of the first Si photodetector 1e at a predetermined time interval, and determines whether or not the amount of change in the detection value of the first Si photodetector 1e is within a predetermined value. Judgment is made (Step S84).
- the sensor operation determination unit 32e determines that the amount of change in the detection value of the first Si photodetector 1e is within a predetermined value (YES in step S84), the sensor operation determination unit 32e determines that the second Si photodetector 2e Instructs to stop (end) detection.
- step S81 If the sensor operation determination unit 32e does not determine that the detection value of the first Si photodetector 1e has changed (NO in step S81), the detection value acquisition unit 31e starts from the first Si photodetector 1e. The detection value is received, and the process proceeds to step S81.
- step S84 If the sensor operation determination unit 32e determines that the amount of change in the detection value of the first Si photodetector 1e is not within a predetermined value (NO in step S84), the process proceeds to step S83.
- the change in the detection value of the first Si photodetector 1e occurs when light of a specific wavelength within the detection target of the first Si photodetector 1e transmits, reflects, absorbs, scatters, and emits light from the substance. That is, in the configuration of the present embodiment, when light having a specific wavelength within the detection target of the first Si photodetector 1e is transmitted from the substance (may be reflected, absorbed, scattered, or emitted). In this configuration, the detection of the second Si photodetector 2e is started.
- the second Si photodetector 2e detects only a limited wavelength range (600 nm to 700 nm) among detection targets (600 nm to 1000 nm) of the first Si photodetector 1e. To do. Therefore, it is possible to determine whether the change in the detection value of the first Si photodetector 1e is a detection target of the second Si photodetector 2e or a change in other detection targets. That is, the optical sensing system 10e can separately (selectively) detect light intensities of 600 nm to 700 nm and 700 nm to 1000 nm.
- the optical sensing system 10e can roughly determine a phenomenon occurring in the observation target substance with a simple configuration including two Si photodetectors and a bandpass filter. Further, there is a common detection target between the detection target of the first Si photodetector 1e and the detection target of the second Si photodetector 2e (the detection target of the second Si photodetector 2e is the first Si photodetector 1e). Is included in the detection target). Therefore, it is not necessary to always operate the second Si photodetector 2e, and the life of the optical sensing system 10e can be extended and the power consumption can be reduced.
- the sensor operation determination unit 32e starts the detection operation of the second Si photodetector 2e in accordance with the detection value of the first Si photodetector 1e. Thereafter, the sensor operation determination unit 32e changes the detection value of the first Si photodetector 1e corresponding to the change of the detection value of the second Si photodetector 2e (the detection target of the second Si photodetector 2e). If it is determined that there is no change in the detection target other than (1), the sensor operation determination unit 32e may instruct to stop the detection of the first Si photodetector 1e.
- the configuration of the above configuration it is possible to provide a time during which the detection of the first Si photodetector 1e is stopped. Therefore, the power consumption of the optical sensing system 10e can be reduced.
- the optical sensing system 10e can be used to detect a change in the state of a substance whose transmission, reflection, or absorption peak changes with respect to light having a wavelength of 600 nm to 700 nm due to a specific phenomenon. That is, when the detection value of the first Si photodetector 1e changes (the light intensity in the red to infrared wavelength range changes), the sensor operation determination unit 32e starts detection of the second Si photodetector 2e. Therefore, it is possible to analyze whether or not the change in the detection value of the first Si photodetector 1e is a change in light intensity between 600 nm and 700 nm. Therefore, the optical sensing system 10e can be used to obtain information on the state change of a substance whose transmission, reflection, or absorption peak changes with respect to light having a wavelength of 600 nm to 700 nm due to a specific phenomenon.
- a specific phenomenon is the decomposition of chlorophyll, which is a pigment of chloroplasts in plants, and the purpose of detection is to obtain information on changes in leaf state.
- the first Si photodetector 1e always detects light in the red to infrared wavelength range (600 nm to 1000 nm).
- the sensor operation determination unit 32e starts detection of the second Si photodetector 2e.
- the second Si photodetector 2e detects light intensity in a limited wavelength range (600 nm to 700 nm) among the detection targets (600 nm to 1000 nm) of the first Si photodetector 1e.
- the user determines whether the change in the detection value of the first Si photodetector 1e is a change in the light intensity at a wavelength of 600 nm to 700 nm, which is one of the absorption peaks of chlorophyll, from the detection value of the second Si photodetector 2e. Or a change other than the light intensity at a wavelength of 600 nm to 700 nm (for example, infrared absorption caused by a change in fluorescence in a wavelength range to be detected by the first Si photodetector 1e or a lack of water content in the leaf) Decrease).
- these determinations may be made based on the comparison by the calculation unit 34e comparing the intensity change from 600 nm to 700 nm with the intensity change from 600 nm to 1000 nm. This determination may be performed by the calculation unit 34e, but is not limited thereto.
- the second Si photodetector 2e is an Si photodetector with a bandpass filter, but the second Si photodetector 2e may be used as another type of detector having higher sensitivity than the first Si photodetector 1e. Good.
- the detection limit is usually low for a highly sensitive detector, if the detection operation is always performed, the detector may be destroyed by an input exceeding the detection limit. This possibility can be reduced by causing the sensor operation determination unit 32e to start detection of the second detector from the detection value of the first Si photodetector 1e.
- the sensor operation determination unit 32e may be configured to determine the detection condition of the second Si photodetector 2e from the detection value of the first Si photodetector 1e.
- the detection condition may affect the detection sensitivity of the second Si photodetector 2e with respect to the detection target, the lifetime of the second Si photodetector 2e, the power consumption of the second Si photodetector 2e, and the like.
- the sensor operation determination unit 32e detects the detection sensitivity of the second Si photodetector 2e with respect to the detection target, the lifetime of the second Si photodetector 2e, the period until the second Si photodetector 2e is refreshed, and the power consumption of the second Si photodetector 2e. From this point of view, an optimal detection condition for the second Si photodetector 2e may be set.
- the optical sensing system 10e may be mounted on a system that detects gas emitted from the leaves of a plant, a system that detects components of liquid fertilizer, a system that detects fluorescence of leaves, and the like.
- the optical sensing system 10e when detecting a gradual change such as a leaf growth state or moisture content, it is not necessary for all the detectors provided in the optical sensing system to always detect. Therefore, it is effective to apply the optical sensing system 10e according to the present embodiment.
- the optical sensing system that detects the light intensity is exemplified, but it may be a sensing system for other continuous physical parameters (detection targets) such as vibration, sound, radiation, and electronic energy.
- control blocks 3a to 3e of the sensing systems 10a to 10e may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or by software using a CPU (Central Processing Unit). May be.
- a logic circuit hardware
- IC chip integrated circuit
- CPU Central Processing Unit
- the sensing systems 10a to 10e include a CPU that executes instructions of a program that is software that realizes each function, and a ROM (Read Only Memory) in which the program and various data are recorded so as to be readable by a computer (or CPU) ) Or a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) that expands the program, and the like.
- the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it.
- a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used.
- the program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program.
- a transmission medium such as a communication network or a broadcast wave
- the present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.
- the first detection object and the second detection object are detection objects included in the first concept and are common to each other and are subordinate concepts of the first concept
- the control unit includes at least one type of detection target included in the first detector or the second detector according to the detection value of the other detector.
- a sensing system characterized by controlling the start or stop of a detection operation.
- the control unit When the first detection target includes only a detection target common to the second detection target, and the second detection target includes a detection target other than the common detection target, the control unit The start or stop of the detection operation by the second detector is controlled according to the detection value of the common detection target included in the first detection target detected by the first detector. Sensing system.
- control unit A sensing system that controls the start or stop of the detection operation by the second detector in accordance with the detection value of the first detection target detected by the first detector.
- the control unit has different detection temperatures of the first detector and the second detector. Sensing system characterized by controlling as follows.
- a sensing system detects a first detection target.
- a first detector (first detector 1, hygrometer 1a, semiconductor gas sensor 1b, first semiconductor gas sensor 1c, Si photodetector 1d, first Si photodetector 1e) and a second detector for detecting a second detection target; 2 detectors (second detector 2, semiconductor gas sensor 2a, absorptive gas sensor 2b, second semiconductor gas sensor 2c, spectrometer 2d, second Si photodetector 2e), the first detector and the above Control unit (control unit 3, control for controlling start or stop of detection operation with second detector 3a to e, sensor operation determination units 32a to e), and the first detection object and the second detection object are detection objects included in the first concept and are common to each other.
- control unit responds to a detection value of one of the first detector and the second detector.
- the start, stop or detection condition of the detection operation of the other detector is controlled.
- the control unit starts, stops or detects the detection operation of the other detector according to the detection value of one of the first detector and the second detector.
- the control unit starts, stops or detects the detection operation of the other detector according to the detection value of one of the first detector and the second detector.
- each detector does not need to always perform detection. Therefore, it is possible to suppress wear that occurs according to the detection time of each detector. That is, the sensing system can have a long life.
- the first detection object and the second detection object are detection objects included in the first concept, and are at least one kind included in a subordinate concept of the first concept that is common to each other. It contains the detection object. For this reason, each detector can obtain
- the detector that is controlled by the detection condition is a semiconductor film type gas sensor
- the reaction film of the semiconductor film type gas sensor is less likely to deteriorate compared to a configuration in which the detection temperature is kept constant at a high temperature. Therefore, the sensing system can have a long life.
- the sensing system according to aspect 2 of the present invention includes the calculation unit (calculation units 34a to 34e) in the above-described aspect 1, and the calculation unit is common to the detection values of the detection targets of the one detector. Except for the detection value of the detection target to be detected, the detection value of the detection target not common to the other detector in the one detector may be set as the detection value of the one detector.
- the calculation unit calculates a detection value of a detection target that is not common to the other detector in the one detector.
- the detection value of the detection target that is not common to the other detector in the one detector can be selectively calculated.
- the sensing system (alcohol detection system 10a) is the above aspect 1,
- the control unit (the control unit 3a, the sensor operation determination unit 32a) detects the detection operation of the other detector according to the detection value of one of the first detector and the second detector.
- the first or second detector is a semiconductor film type gas sensor (semiconductor gas sensor 1b), and the control unit (control unit 3a, sensor operation determination unit 32a)
- the temperature of the reaction film of the gas sensor of the type is controlled so that the semiconductor film type gas sensor does not detect at least one type of detection object included in the subordinate concept of the first concept, Also good.
- the said control part controls the temperature of the reaction film
- one of the detectors can detect a detection target excluding at least one type of detection target included in the subordinate concept of the first concept, which is common to the above-described one.
- the sensing system (alcohol detection system 10a, air quality monitoring system 10b, optical sensing system 10d) according to aspect 4 of the present invention is the same as the first detector (hygrometer 1a, semiconductor gas sensor 1b, Si
- the detection principle of the photodetector 1d, and the detection principle of the second detector may be different from each other.
- the detection start or stop (end) of a detector having characteristics such as difficulty in refreshing, high running cost, consumption, and high power consumption is controlled according to the detection value of the other detector. It becomes possible to do.
- a detector whose start or stop (end) is controlled need not always perform detection.
- the above configuration can realize a sensing system with low power consumption, low cost, and long life.
- the sensing system gas sensing system 10c, optical sensing system 10e according to aspect 5 of the present invention is the same as that of aspects 1 to 3 in that the first detector (first semiconductor gas sensor 1c, first Si photodetector 1e).
- the detection principle and the detection principle of the second detector are the same, and the detection conditions of the first detector and the second detector are different. It may be.
- the two detectors have the same detection principle. Therefore, since the control method of each detector is common, the processing amount of the control processing of the two detectors can be reduced.
- the detection start or end of a detector having a reaction film that is difficult to refresh is It becomes possible to control according to the detector of the detector. Therefore, detection of a detector having a reaction film that is difficult to refresh can be started only when necessary.
- the detection target does not react with the reaction film, so that the saturation of the reaction between the detection target and the reaction film of the detector can be delayed.
- the number of reaction film refreshes performed in the saturation state can be suppressed.
- the temperature of the reaction film is usually raised, so that the number of refreshes is suppressed, thereby preventing the reaction film from being deteriorated and extending the life of the detector of the sensing system.
- the sensing system according to each aspect of the present invention may be realized by a computer.
- the sensing system is controlled by causing the computer to realize the sensing system by operating the computer as each unit included in the sensing system.
- a program and a computer-readable recording medium on which the program is recorded also fall within the scope of the present invention.
- the present invention can be used for a sensing system.
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Abstract
Description
本発明に係るセンシングシステム10は、第1の検出器1、第2の検出器2および制御部(制御手段)3を備えている。
第1の検出器1および第2の検出器2としては、フォトディテクタ、マイク、圧電素子、電流計、電圧計、テスラメータ、温度計、イオンカウンター、ガイガーカウンター、パーティクルカウンタ、半導体ガスセンサ、光学センサ、SPR(Surface plasmon resonance)センサなどを使用することができる。
制御部3は、第1の検出器または上記第2の検出器の何れか一方の検出器の検出値に応じて、他方の検出器の検出動作の開始、停止(終了)または検出条件を制御する。
次に、本発明に係るセンシングシステム10の動作について説明する。センシングシステム10の動作として、主に以下の3つが挙げられる。
本発明の実施形態について、図1~図5に基づいて説明すれば、以下のとおりである。なお、説明の便宜上、前記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。
本実施形態に係るセンシングシステムの外観の一例について、図2の(a)~(c)を用いて説明する。本実施形態に係るセンシングシステムは、アルコール検出システム10a(センシングシステム)である。例えば、アルコール検出システム10aは、人の飲酒量または酩酊度を確認するために用いられる。本実施形態では、アルコール検出システム10aを、車内において運転者のアルコールチェックとして利用する例について説明する。本実施形態での検出目的は、人の呼気に含まれるエタノール濃度に関する情報を得ることである。
次に、図3を参照して、本実施形態に係るアルコール検出システム10aの要部構成について説明する。図3は、アルコール検出システム10aの構成の概略を示す機能ブロック図である。図3に示すように、アルコール検出システム10aは、湿度計1a、半導体ガスセンサ2a、制御部3a、表示部4aおよび記憶部5aを備えている。
湿度計1aは、水分を吸収することで電気抵抗が変化ことを利用したデジタル湿度計である。湿度計1aは検出対象として、湿度を検出する。ここで、湿度とは水蒸気の濃度を示す。湿度計1aは検出値を制御部3aに送信する。
半導体ガスセンサ2aは、半導体ガスセンサ(半導体型ガスセンサ、半導体膜型ガスセンサ)である。半導体ガスセンサ2aは検出対象としてエタノール濃度および湿度を検出する。半導体ガスセンサ2aは検出値を制御部3aに送信する。
制御部3aは、検出値受付け部31a、センサ動作判断部(制御手段)32a、表示制御部33a、および算出部(算出手段)34aを備えている。
次に制御部3aが行うデータ処理の流れについて、図5の(a)を用いて説明する。図5の(a)は、本実施形態に係る制御部3aが行うデータ処理の流れを示すフローチャートである。
次に図5の(b)を用いて、他のデータ処理の流れについて、説明する。
(変形例2)
次に制御部3aが行うデータ処理の流れの変形例について、図5の(c)を用いて説明する。本変形例では、第1の検出器を半導体ガスセンサ、第2の検出器をデジタル湿度計としている。制御部3が、第1の検出器である半導体ガスセンサおよび第2の検出器であるデジタル湿度計の検出値をもとに、第1の検出器および第2の検出器の動作を決定する。図5の(c)は、本変形例に係る制御部3aが行うデータ処理の流れを示すフローチャートである。
本発明の他の実施形態について、図6~図9に基づいて説明すれば、以下のとおりである。なお、説明の便宜上、前記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。
本実施形態に係るセンシングシステムの外観の一例について、図6を用いて説明する。本実施形態に係るセンシングシステムは、空質モニタリングシステム10b(センシングシステム)である。空質モニタリングシステム10bの検出目的は空質に関する情報を得ることである。
次に、図7を参照して、本実施形態に係る空質モニタリングシステム10bの要部構成について説明する。図7は、空質モニタリングシステム10bの構成の概略を示す機能ブロック図である。図7に示すように、空質モニタリングシステム10bは、半導体ガスセンサ1b、吸光光度式ガスセンサ2b、制御部3b、表示部4bおよび記憶部5bを備えている。
半導体ガスセンサ1bは、半導体ガスセンサである。半導体ガスセンサ1bは検出対象としてVOCガス一般を検出する。半導体ガスセンサ1bは、検出値を制御部3bに送信する。
吸光光度式ガスセンサ2bは、吸光光度式のガスセンサである。吸光光度式ガスセンサ2bは検出対象としてアルデヒド系のガスを検出する。吸光光度式ガスセンサ2bはアルデヒド系のガスが接触することにより色が変わる反応チップと、このチップの吸光度を測定する測定器とからなる。吸光光度式ガスセンサ2bは検出値を制御部3bに送信する。
次に制御部3bが行うデータ処理の流れについて、図8の(a)を用いて説明する。図8の(a)は、本実施形態に係る制御部3bが行うデータ処理の流れを示すフローチャートである。
次に制御部3bが行うデータ処理の流れの変形例について、図8の(b)を用いて説明する。本変形例に係る制御部3bは、吸光光度式ガスセンサ2bの検出値に応じて半導体ガスセンサ1bの検出の制御を行なう。図8の(b)は、本変形例に係る制御部3bが行うデータ処理の流れを示すフローチャートである。
本発明の他の実施形態について、図11~図13に基づいて説明すれば、以下のとおりである。なお、説明の便宜上、前記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。
本実施形態に係るセンシングシステムの外観の一例について、図11を用いて説明する。本実施形態に係るセンシングシステムは、ガスセンシングシステム10c(ガスセンシングシステム)である。図11は、ガスセンシングシステム10cを自動車104に搭載した例を示す図である。すなわち、ガスセンシングシステム10cの検出目的は自動車104の排気ガス濃度に関する情報を得ることである。
次に、図12を参照して、本実施形態に係るガスセンシングシステム10cの要部構成について説明する。図12は、ガスセンシングシステム10cの構成の概略を示す機能ブロック図である。図12に示すように、ガスセンシングシステム10cは、第1の半導体ガスセンサ1c、第2の半導体ガスセンサ2c、制御部3c、表示部4cおよび記憶部5cを備えている。
第1の半導体ガスセンサ1cは、検出条件が200℃に設定されている半導体ガスセンサである。図9に示すように、第1の半導体ガスセンサ1cは、NO、NO2、COを検出対象をとする。第1の半導体ガスセンサ1cは検出値を制御部3cに送信する。
第2の半導体ガスセンサ2cは、検出条件が400℃に設定されている半導体ガスセンサである。図9に示すように、第2の半導体ガスセンサ2cは、COを検出対象をとする。第2の半導体ガスセンサ2cは検出値を制御部3cに送信する。
次に制御部3cが行うデータ処理の流れについて、図13の(a)を用いて説明する。図13の(a)は、本実施形態に係る制御部3cが行うデータ処理の流れを示すフローチャートである。
次に制御部3cが行うデータ処理の流れの変形例について、図13の(b)を用いて説明する。本変形例に係る制御部3cは、第1の半導体ガスセンサ1cの検出値に応じて第2の半導体ガスセンサ2cの検出を開始し、第1の半導体ガスセンサ1cおよび/または第2の半導体ガスセンサ2cの検出値に応じて第2の半導体ガスセンサ2cの検出条件の設定を行なう。図13の(b)は、本変形例に係る制御部3bが行うデータ処理の流れを示すフローチャートである。
本発明の実施形態について、図14~図16に基づいて説明すれば、以下のとおりである。なお、説明の便宜上、前記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。
本実施形態に係るセンシングシステムの外観の一例について、図14の(a)および(b)を用いて説明する。本実施形態に係るセンシングシステムは、検出目的を、光の透過、反射、吸収、散乱、発光スペクトルから物質の存在や状態の情報を得ることとした、光センシングシステム10d(センシングシステム)である。
次に、図15を参照して、本実施形態に係る光センシングシステム10dの要部構成について説明する。図15は、光センシングシステム10dの構成の概略を示す機能ブロック図である。図15に示すように、光センシングシステム10dは、Siフォトディテクタ(第1の検出器)1d、分光器(第2の検出器)2d、制御部3d、表示部4dおよび記憶部5dを備えている。
Siフォトディテクタ1dは、検出対象として赤~赤外の波長範囲(例えば600nm~1100nm)の光を検出する。Siフォトディテクタ1dは検出値を制御部3dに送信する。
分光器2dは、検出対象として紫外~近赤外域の波長範囲(例えば300nm~750nm)を検出する。分光器2dは検出値を制御部3dに送信する。
制御部3dは、検出値取得部31d、センサ動作判断部32d、表示制御部33d、および算出部34dを備えている。
次に制御部3dが行うデータ処理の流れについて、図16の(a)を用いて説明する。図16の(a)は、本実施形態に係る制御部3dが行うデータ処理の流れを示すフローチャートである。
例えば、上記判断において、所定の時間あたりのSiフォトディテクタ1dの検出値の変化量が2倍以上に変化した場合、あるいは、Siフォトディテクタ1dの検出開始時の検出値の1割以上の変化があった場合、Siフォトディテクタ1dの検出値が変化したと判断してもよい。
本変形例においては、第1の検出器が紫外~赤外域の波長範囲(例えば300nm~1000nm)を検出できる分光器2dであり、第2の検出器を赤~赤外の波長範囲(例えば600nm~1100nm)の光を検出可能なSiフォトディテクタ1dとしている。本変形例においては、上記の第2の検出結果をもとに第1の検出器の動作を決定するシステムに対応する。
次に制御部3dが行うデータ処理の流れの変形例について、図16の(c)を用いて説明する。図16の(c)は、本変形例に係る制御部3dが行うデータ処理の流れを示すフローチャートである。
本発明の実施形態について、図17および図18に基づいて説明すれば、以下のとおりである。なお、説明の便宜上、前記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。
次に、図17を参照して、本実施形態に係る光センシングシステム10eの要部構成について説明する。図17は、光センシングシステム10eの構成の概略を示す機能ブロック図である。図17に示すように、光センシングシステム10eは、第1のSiフォトディテクタ1e(第1の検出器)、第2のSiフォトディテクタ2e(第2の検出器)、制御部3e、表示部4eおよび記憶部5eを備えている。
第1のSiフォトディテクタ1eは、検出対象として赤~赤外の波長範囲(例えば600nm~1000nm)の光を検出する。第1のSiフォトディテクタ1eは検出値を制御部3eに送信する。
第2のSiフォトディテクタ2eは、検出対象として特定の波長範囲(例えば600nm~700nm)を検出する。第2のSiフォトディテクタ2eは検出値を制御部3eに送信する。例えば、第2のSiフォトディテクタ2eは特定の波長範囲のみを透過させるバンドパスフィルタを備えている構成である。
制御部3eは、検出値取得部31e、センサ動作判断部32e、表示制御部33e、および算出部34eを備えている。
次に制御部3eが行うデータ処理の流れについて、図18を用いて説明する。図18は、本実施形態に係る制御部3eが行うデータ処理の流れを示すフローチャートである。
例えば、上記判断において、所定の時間あたりの第1のSiフォトディテクタ1eの検出値の変化量が2倍以上に変化した場合、あるいは、第1のSiフォトディテクタ1eの検出開始時の検出値の1割以上の変化があった場合、第1のSiフォトディテクタ1eの検出値が変化したと判断してもよい。
センシングシステム10a~eの制御ブロック3a~eは、集積回路(ICチップ)等に形成された論理回路(ハードウェア)によって実現してもよいし、CPU(Central Processing Unit)を用いてソフトウェアによって実現してもよい。
本発明は、以下のように表すこともできる。
本発明の態様1に係るセンシングシステム(センシングシステム10、アルコール検出システム10a、空質モニタリングシステム10b、ガスセンシングシステム10c、光センシングシステム10d、光センシングシステム10e)は、第1の検出対象を検出する第1の検出器(第1の検出器1、湿度計1a、半導体ガスセンサ1b、第1の半導体ガスセンサ1c、Siフォトディテクタ1d、第1のSiフォトディテクタ1e)と、第2の検出対象を検出する第2の検出器(第2の検出器2、半導体ガスセンサ2a、吸光光度式ガスセンサ2b、第2の半導体ガスセンサ2c、分光器2d、第2のSiフォトディテクタ2e)と、上記第1の検出器と上記第2の検出器との検出動作の開始または停止を制御する制御部(制御部3、制御部3a~e、センサ動作判断部32a~e)とを備え、上記第1の検出対象および上記第2の検出対象は、第1の概念に包含される検出対象であって、互いに共通する、上記第1の概念の下位概念に包含される少なくとも1種類の検出対象を含み、上記制御部は、上記第1の検出器または上記第2の検出器の何れか一方の検出器の検出値に応じて、他方の検出器の検出動作の開始、停止または検出条件を制御する。
上記制御部(制御部3a、センサ動作判断部32a)は、上記第1の検出器または上記第2の検出器の何れか一方の検出器の検出値に応じて、他方の検出器の検出動作の検出条件を制御し、上記第1または上記第2の検出器は半導体膜型のガスセンサ(半導体ガスセンサ1b)であり、上記制御部(制御部3a、センサ動作判断部32a)は、上記半導体膜型のガスセンサの反応膜の温度を制御し、上記半導体膜型のガスセンサが上記互いに共通する、上記第1の概念の下位概念に包含される少なくとも1種類の検出対象を検出しないように制御してもよい。
1a 湿度計(第1の検出器)
1b 半導体ガスセンサ(第1の検出器)
1c 第1の半導体ガスセンサ(第1の検出器)
1d Siフォトディテクタ(第1の検出器)
1e 第1のSiフォトディテクタ(第1の検出器)
2 第2の検出器
2a 半導体ガスセンサ(第2の検出器)
2b ガスセンサ(第2の検出器)
2b 吸光光度式ガスセンサ(第2の検出器)
2c 第2の半導体ガスセンサ(第2の検出器)
2d 分光器(第2の検出器)
2e 第2のSiフォトディテクタ(第2の検出器)
3、3a~e 制御部
10 センシングシステム
10a アルコール検出システム(センシングシステム)
10b 空質モニタリングシステム(センシングシステム)
10c ガスセンシングシステム(センシングシステム)
10d 光センシングシステム(センシングシステム)
10e 光センシングシステム(センシングシステム)
32a~e センサ動作判断部(制御部)
34a~e 算出部
Claims (5)
- 第1の検出対象を検出する第1の検出器と、
第2の検出対象を検出する第2の検出器と、
上記第1の検出器と上記第2の検出器との検出動作の開始または停止を制御する制御部とを備え、
上記第1の検出対象および上記第2の検出対象は、第1の概念に包含される検出対象であって、互いに共通する、上記第1の概念の下位概念に包含される少なくとも1種類の検出対象を含み、
上記制御部は、
上記第1の検出器または上記第2の検出器の何れか一方の検出器の検出値に応じて、他方の検出器の検出動作の開始、停止または検出条件を制御することを特徴とするセンシングシステム。 - 上記制御部は、さらに、算出部を備えており、
上記算出部は、上記一方の検出器の検出対象の検出値から上記互いに共通する検出対象の検出値を除いて、上記一方の検出器おける他方の検出器と共通しない検出対象の検出値を上記一方の検出器の検出値とすることを特徴とする請求項1に記載のセンシングシステム。 - 上記制御部は、上記第1の検出器または上記第2の検出器の何れか一方の検出器の検出値に応じて、他方の検出器の検出動作の検出条件を制御し、
上記第1または上記第2の検出器は半導体膜型のガスセンサであり、
上記制御部は、上記第1または第2の検出器の検出の開始を制御し、
上記制御部は、上記半導体膜型のガスセンサの反応膜の温度を制御することによって、上記半導体膜型のガスセンサが上記互いに共通する、上記第1の概念の下位概念に包含される少なくとも1種類の検出対象を検出しないように制御することを特徴とする請求項1に記載のセンシングシステム。 - 上記第1の検出器の検出原理と第2の検出器の検出原理とが、互いに異なっていることを特徴とする請求項1から3の何れか1項に記載のセンシングシステム。
- 第1の検出器の検出原理と第2の検出器の検出原理とが、同じであり、第1の検出器と第2の検出器との検出条件が異なることを特徴とする請求項1から3の何れか1項に記載のセンシングシステム。
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CN115718126A (zh) * | 2017-10-26 | 2023-02-28 | 霍尼韦尔国际公司 | 用于使用用于选择性、低分辨率甲醛检测器的多种固体电解质传感器的系统和方法 |
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