CN110619730B - Fire detector - Google Patents
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- CN110619730B CN110619730B CN201910149880.1A CN201910149880A CN110619730B CN 110619730 B CN110619730 B CN 110619730B CN 201910149880 A CN201910149880 A CN 201910149880A CN 110619730 B CN110619730 B CN 110619730B
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
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- Chemical & Material Sciences (AREA)
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- Fire Alarms (AREA)
Abstract
The invention provides a fire detector, in a smoke detector with a heat sensor and a smoke sensor, the detection result of the heat sensor can be effectively used in addition to fire detection based on heat. A fire detector is provided with: a thermal sensor; a first smoke sensor; a second smoke sensor; and a control unit that stops the operation of the second smoke sensor when a rate of increase of the output from the thermal sensor is smaller than a threshold value, and activates the second smoke sensor to detect smoke density based on the outputs from the first smoke sensor and the second smoke sensor when the rate of increase of the output from the thermal sensor is larger than the threshold value.
Description
Technical Field
The present invention relates to a fire detector including a heat sensor and a smoke sensor.
Background
Conventionally, there is an alarm device including a heat sensor and a smoke sensor as fire detection sensors, which are sensors having different structures for fire detection (see, for example, patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2000-132761
In the alarm described in patent document 1, it is determined that a fire is occurring when the detection result of the heat sensor exceeds a threshold value or when the detection result of the smoke sensor exceeds a threshold value. That is, in the alarm of patent document 1, the heat sensor and the smoke sensor detect a fire independently, and the detection result of the heat sensor and the detection result of the smoke sensor do not affect the detection result of each other.
In addition, a detector provided with a smoke sensor is generally installed on a ceiling or a wall near the ceiling, but smoke reaches the ceiling or the vicinity of the ceiling due to an updraft generated by heat from a fire. Therefore, when the smoke sensor detects smoke, it can be said that an updraft due to heat is generated. Therefore, the heat sensor of the detector can detect the rise of heat, although the heat sensor does not detect the heat to such an extent that it can determine that it is a fire from the detected heat. As described above, the heat sensor and the smoke sensor are sensors for detecting different physical quantities due to a fire, but the detection result of the heat sensor suggests the detection result of the smoke sensor. In this case, in the alarm described in patent document 1, the detection result of the heat sensor and the detection result of the smoke sensor are processed independently, and it is desired to use the detection results of the heat sensor and the smoke sensor more effectively.
Disclosure of Invention
The present invention has been made in view of the above-described problems, and provides a fire detector capable of effectively utilizing a detection result of a heat sensor in a smoke detector including the heat sensor and a smoke sensor.
Means for solving the problems
The fire detector of the present invention comprises: a thermal sensor; a first smoke sensor; a second smoke sensor; and a control unit that stops the operation of the second smoke sensor when a rate of increase of the output from the thermal sensor is smaller than a threshold value, and activates the second smoke sensor to detect smoke density based on the outputs from the first smoke sensor and the second smoke sensor when the rate of increase of the output from the thermal sensor is larger than the threshold value.
Effects of the invention
According to the present invention, the detection result of the heat sensor can be used to reduce the power consumption of the fire detector including two smoke sensors.
Drawings
Fig. 1 is a functional block diagram of a fire detection system and a fire detector according to an embodiment.
Fig. 2 is a flowchart illustrating a fire detection process of the fire detector according to the embodiment.
Fig. 3 is a timing chart illustrating an example of operations of each part of the fire detector according to the embodiment.
Description of the reference numerals
1. A first light emitting element; 2. a second light emitting element; 3. a light receiving element; 4. a control unit; 5. a memory; 6. a transmitting part; 7. a thermal sensor; 10. a fire detector; 20. a fire signal receiver.
Detailed Description
Detailed description of the preferred embodiments
(construction of fire Detector 10)
Fig. 1 is a functional block diagram of a fire detection system and a fire detector 10 according to an embodiment. The fire detector 10 includes a first light emitting element 1, a second light emitting element 2, a light receiving element 3, a control unit 4, a memory 5, a transmitter 6, and a heat sensor 7. The fire detector 10 is connected to the fire signal receiver 20 via a signal line, and the fire detector 10 outputs a signal indicating the presence or absence of a fire to the fire signal receiver 20. In the present embodiment, a fire detection system is configured by one or more fire detectors 10 and a fire signal receiver 20.
The fire detector 10 of the present embodiment includes a photoelectric smoke sensor that emits light toward a smoke detection space formed in a housing and detects smoke by receiving scattered light generated by smoke present in the smoke detection space. In the present embodiment, the first light emitting element 1 and the light receiving element 3 function as a first smoke sensor that detects a change in a physical quantity due to smoke, and the second light emitting element 2 and the light receiving element 3 function as a second smoke sensor that detects a change in a physical quantity due to smoke. In addition, the fire detector 10 of the present embodiment has a heat sensor 7 that detects heat generated by a fire. As described above, the fire detector 10 of the present embodiment is a detector that detects heat and smoke generated by a fire.
The first light emitting element 1 and the second light emitting element 2 are, for example, leds (light emitting diodes), and emit light toward the smoke detection space. Both the first light emitting element 1 and the second light emitting element 2 emit red light (for example, wavelength 655nm) in the visible light region toward the smoke detection space. The first light-emitting element 1 and the second light-emitting element 2 are not limited to light-emitting elements that emit red light having a wavelength of 655nm, and may be light-emitting elements that emit light having a peak wavelength in a wavelength range of 600nm to 700 nm. The first light-emitting element 1 and the second light-emitting element 2 have, for example, amplifiers with variable amplification factors, and light is emitted from the first light-emitting element 1 and the second light-emitting element 2 at an intensity corresponding to the amplification factor of the amplifiers. In addition, the first light-emitting element 1 and the second light-emitting element 2 may not have the same wavelength but have different wavelengths.
The light receiving element 3 receives light and outputs a signal corresponding to the received light intensity. The light receiving element 3 is, for example, a photodiode. The light receiving element 3 is disposed at a position where the light emitted from the first light emitting element 1 and the second light emitting element 2 does not directly enter. That is, when the optical axis of the first light emitting element 1 is set as the first projection axis, the optical axis of the second light emitting element 2 is set as the second projection axis, and the optical axis of the light receiving element 3 is set as the light receiving axis, the first projection axis intersects with the light receiving axis, and the second projection axis intersects with the light receiving axis. The light receiving element 3 receives scattered light generated by the reflection of the light emitted from the first light emitting element 1 and the second light emitting element 2 by the particles of smoke.
The light receiving element 3 is located at a position where an angle θ 1 (scattering angle) of the light receiving axis with respect to the first projection axis of the first light emitting element 1 becomes an acute angle (for example, 60 degrees) in a plan view, and at a position where an angle θ 2 (scattering angle) of the light receiving axis with respect to the second projection axis of the second light emitting element 2 becomes an obtuse angle (for example, 110 degrees). The angle θ 1 is different from the angle θ 2. Therefore, when the first light emitting element 1 emits light, the light receiving element 3 receives forward scattered light of smoke generated by the light of the first light emitting element 1. When the second light emitting element 2 emits light, the light receiving element 3 receives the backscattered light of smoke generated by the light of the second light emitting element 2. The angle θ 1 may be an acute angle, and is more preferably a value in the range of 50 to 70 degrees. The angle θ 2 may be an obtuse angle, and is more preferably a value in the range of 100 to 120 degrees.
The light receiving element 3 outputs the value of the light receiving intensity of the scattered light from smoke generated by the light of the first light emitting element 1 as the first output signal S1, and outputs the value of the light receiving intensity of the scattered light from smoke generated by the light of the second light emitting element 2 as the second output signal S2.
The control unit 4 performs control for switching the activation state and the deactivation state of the first light emitting element 1, the second light emitting element 2, the light receiving element 3, and the thermal sensor 7. Here, the activation state refers to a state in which electric power is supplied. The control unit 4 controls the light emission operation of the first light-emitting element 1 and the second light-emitting element 2. The controller 4 determines whether or not a fire has occurred using the smoke density obtained by a/D converting the first output signal S1 and the second output signal S2 output from the light-receiving element 3 by the a/D converter. Data such as a fire threshold for determining whether or not a fire has occurred is stored in the memory 5. When it is determined that a fire has occurred, the control unit 4 controls the transmission unit 6 to transmit a signal indicating the occurrence of the fire to the fire signal receiver 20.
Here, the control unit 4 is constituted by dedicated hardware or an mpu (micro Processing unit) that executes a program stored in a memory. When the control unit 4 is dedicated hardware, the control unit 4 corresponds to, for example, a single circuit, a composite circuit, an asic (application Specific Integrated circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. Each function realized by the control unit 4 may be realized by separate hardware, or may be realized by one hardware. When the control unit 4 is an MPU, each function executed by the control unit 4 is realized by software, firmware, or a combination of software and firmware. Software and firmware are described as programs and are stored in internal memory. The MPU realizes each function of the control unit 4 by reading and executing a program stored in an internal memory. The internal memory is, for example, a nonvolatile or volatile semiconductor memory such as a RAM, a ROM, a flash memory, an EPROM, or an EEPROM. The memory 5 is a nonvolatile or volatile semiconductor memory such as a RAM, a ROM, a flash memory, an EPROM, and an EEPROM. The transmitter 6 is a signal transmission circuit that transmits a fire signal to the fire signal receiver 20.
The heat sensor 7 is a sensor that detects a change in heat around the fire detector 10. The thermal sensor 7 is, for example, a thermistor, a thermocouple, an infrared sensor, or a peltier element.
In the present embodiment, the photoelectric smoke sensor is exemplified as the first smoke sensor and the second smoke sensor, but the specific configuration of the smoke sensor is not limited to this example. As the first smoke sensor and the second smoke sensor, an ionization type smoke sensor may be used.
Next, a smoke detection process for detecting a fire by smoke and a heat detection process for detecting a fire by heat will be described.
(Smoke detection treatment)
The controller 4 detects whether or not a fire has occurred by comparing the smoke density, which is obtained from the first output signal S1 output from the light-receiving element 3 when the first light-emitting element 1 emits light or the first output signal SC1 obtained by correcting the first output signal S1, with a fire threshold value, which is a threshold value for fire determination.
Here, a process of correcting the first output signal S1 to obtain the first output signal SC1 will be described. When a fire occurs, not only 1 kind of smoke is generated, but various kinds of smoke such as white smoke, gray smoke, black smoke, and the like are generated according to the combustion products. In addition, in a room where the fire detector 10 is installed, hot air may be generated instead of smoke generated by a fire. The fire detector 10 needs to detect and report a fire when any of these various types of smoke is generated, and needs not to determine a fire when hot air is generated. The output ratio R of the first output signal S1 and the second output signal S2 (first output signal S1/second output signal S2) is a value corresponding to the type of smoke and whether or not the smoke is hot air. That is, the type of smoke and whether or not the smoke is hot air can be determined from the output ratio R.
The light receiving intensity of the light receiving element 3 when white smoke and gray smoke are present in the smoke detection space of the fire detector 10 is greater than the light receiving intensity of the light receiving element 3 when black smoke is present in the smoke detection space. In other words, when the black smoke is in the smoke detection space, the light receiving intensity of the light receiving element 3 is relatively small. Therefore, if the same fire threshold is used for black smoke, white smoke, and gray smoke, it is difficult to determine that a fire has occurred in the case of black smoke. In addition, when the hot air is in the smoke detection space, it is necessary to determine whether the fire is present. Thus, the first output signal S1 is corrected based on the output ratio R, that is, the type of smoke or the like, to obtain a corrected first output signal SC1, and the fire is determined using the corrected first output signal SC 1.
The memory 5 stores a correction table or a calculation formula in which an output ratio R, which is an index for determining the type of smoke and whether or not the smoke is hot air, is associated with a correction coefficient Cf. The control unit 4 refers to the correction table or the calculation formula, acquires the correction coefficient Cf corresponding to the calculated output ratio R, corrects the first output signal S1 using the acquired correction coefficient Cf, and generates a corrected first output signal SC 1. For example, the modified first output signal SC1 is obtained such that the modified first output signal SC1 is Cf × the first output signal S1. In order to obtain the corrected first output signal SC1 following the measurement value by the CS meter (dimming ratio meter), the correction coefficient Cf in the case of black smoke is a value larger than the correction coefficient Cf in the case of white smoke and gray smoke. In the case of hot air, it is necessary to determine that the fire is not present, and therefore, the correction coefficient Cf in the case of hot air is set to a value that is smaller in the value of the first output signal SC1 after correction than in the value of the first output signal S1 before correction. Since the corrected first output signal SC1 indicates a value corresponding to smoke density, the value of the first output signal SC1 is referred to as smoke density.
When the smoke density, which is the value of the corrected first output signal SC1, is greater than the fire threshold value, the control unit 4 determines that a fire has occurred. When it is determined that a fire has occurred, a fire signal is transmitted from the transmitter 6 to the fire signal receiver 20.
Instead of transmitting the fire signal from the transmitter 6, the smoke density corresponding to the corrected first output signal SC1 may be transmitted as a simulated value. In this case, the fire is discriminated by the fire signal receiver 20 that received the analog value from the transmitter 6. In addition, although the case where the first output signal S1 is corrected is described here, the fire threshold value used for determining a fire may be corrected instead of correcting the first output signal S1.
The timing at which the control unit 4 obtains the output ratio R will be described. For example, the control unit 4 can cause the first light-emitting element 1 and the second light-emitting element 2 to alternately emit light periodically and continuously obtain the output ratio R. In addition, the control unit 4 constantly lights the first light emitting element 1 and monitors whether or not the output from the light receiving element 3 exceeds a set value set to a value smaller than the fire threshold. The set value is stored in the memory 5. The control unit 4 may alternately cause the first light-emitting element 1 and the second light-emitting element 2 to emit light to obtain the output ratio R when the output from the light-receiving element 3 exceeds a set value.
(thermal detection treatment)
The control unit 4 detects whether or not a fire has occurred by comparing the amount of heat indicated by the signal output from the thermal sensor 7 with a thermal fire threshold value for fire determination based on heat.
(fire detection processing)
Next, the operation of the fire detector 10 of the present embodiment for fire detection will be described. Fig. 2 is a flowchart illustrating a fire detection process of the fire detector 10 according to the embodiment. In the normal monitoring state, the heat sensor 7 and the first smoke sensor are in the activated state, and the second smoke sensor is in the deactivated state (S10). In the present embodiment, the first light emitting element 1 and the light receiving element 3 functioning as the first smoke sensor are in an activated state, and the second light emitting element 2 is in a deactivated state. The second light emitting element 2 in the stopped state is not supplied with power.
In the monitoring state, it is determined whether the smoke density detected by the first smoke sensor is greater than a fire threshold (S11). Here, the value of the first output signal S1 is used for the determination of the smoke density in step S11. If the smoke density is higher than the fire threshold value (YES in S11), a fire occurrence notification is issued (S17). On the other hand, in the case where the smoke density is not greater than the fire threshold (NO at S11), it is determined whether the output of the thermal sensor 7 is greater than the thermal fire threshold (S12).
When the output of the heat sensor 7 is larger than the thermal fire threshold value (S12: YES), a fire occurrence notification is issued (S17). On the other hand, in the case where the output of the thermal sensor 7 is not greater than the thermal fire threshold (S12: NO), the flow proceeds to step S13.
In step S13, it is determined whether the rate of increase in the output of the thermal sensor 7 is greater than a threshold value (S13). The rate of increase in the output of the thermal sensor 7 is determined as the amount of temperature increase per unit time. The threshold value may be set to 3 ℃/60 sec, for example. In the case where the rate of increase in the output of the thermal sensor 7 is not greater than the threshold value (S13: NO), the flow returns to step S10.
On the other hand, when the rate of increase in the output of the heat sensor 7 is greater than the threshold value (S13: YES), the second smoke sensor is brought into an activated state (S14). In the present embodiment, the light receiving element 3 functioning as the second smoke sensor is already in the activated state as the first smoke sensor, and therefore the second smoke sensor is changed from the deactivated state to the activated state.
Subsequently, the type of smoke and whether the smoke is hot air are determined (S15). As described above, the kind of smoke is determined from the output ratio R of the first output signal S1 and the second output signal S2.
Next, it is determined whether the smoke density detected by the first smoke sensor is greater than a fire threshold (S16). Here, the value of the corrected first output signal SC1 is used for the determination of the smoke density in step S16. The corrected first output signal SC1 is obtained by correcting the first output signal S1 by the correction coefficient Cf obtained from the type of smoke determined in step S15. If the smoke density is higher than the fire threshold value (YES in S16), a fire occurrence notification is issued (S17). On the other hand, if the smoke density is not greater than the fire threshold (S16: NO), the process returns to step S10.
In this way, in the present embodiment, in the monitoring state, the thermal sensor 7 and the first smoke sensor are in the activated state, and the second smoke sensor is in the deactivated state.
Fig. 3 is a timing chart illustrating an operation example of each part of the fire detector 10 according to the embodiment. In fig. 3, the timing of the change in the output of the thermal sensor 7 and the action of the access to the first smoke sensor, the second smoke sensor, the thermal sensor 7, and the memory 5 are shown. In the example of fig. 3, the period until time t is a normal monitoring state. That is, the first smoke sensor and the heat sensor 7 are in the activated state, and the second smoke sensor is in the deactivated state (refer to step S10 of fig. 2).
Here, the first smoke sensor in the activated state periodically performs an operation of detecting the smoke density, and outputs a first output signal S1 corresponding to the detected value. Specifically, the first light emitting element 1 periodically emits light, and the light receiving element 3 outputs a first output signal S1 corresponding to the received light intensity at the time of light emission from the first light emitting element 1. The light receiving element 3 may be activated periodically at the timing when the first light emitting element 1 emits light, or may be activated at all times. The heat sensor 7 in the activated state periodically detects a change in ambient heat and outputs a signal corresponding to the detected value.
While the second smoke sensor is in the stopped state, processing other than fire detection is mainly performed. Specifically, the access of the control unit 4 to the memory 5 is intermittently performed. The access to the memory 5 includes operations such as writing data temporarily stored in the internal memory of the control unit 4 into the memory 5, and reading data stored in the memory 5 into the internal memory for the processing of the control unit 4. The data to be read from and written into the memory 5 is, for example, a sensitivity compensation value for compensating for a deviation in the sensitivity of the fire detector 10, the operation history of the first smoke sensor and the second smoke sensor, the number of times of fire detection, the activation time of the fire detector 10, and the like.
In addition to or instead of the access to the memory 5, the control unit 4 may perform the failure determination process. For example, in a state where the amplification factor of an amplifier provided in the first light-emitting element 1 is increased for failure determination, the first light-emitting element 1 is caused to emit light, and the control unit 4 acquires the output signal of the light-receiving element 3 at that time. The control unit 4 can determine whether or not the a/D converter of the control unit 4 has failed, based on whether or not the value of the acquired output signal is within a predetermined range.
In fig. 3, the rate of increase in the output of the thermal sensor 7, that is, the time at which the amount of increase in the output of the thermal sensor 7 per unit time exceeds the threshold value is represented by time t. After time t, the second smoke sensor is in an activated state. The second smoke sensor in the activated state periodically performs an operation of detecting the smoke density, and outputs a second output signal S2 corresponding to the detected value. During the period in which the second smoke sensor is in the activated state, no access to the memory 5 is made. I.e. access to the second smoke sensor and the memory 5 is not performed simultaneously.
As described above, according to the present embodiment, when the rate of increase in the output from the thermal sensor 7 is smaller than the threshold value, the operation of the second smoke sensor is stopped. By stopping the operation of the second smoke sensor, the power consumption of the fire detector 10 can be reduced. The fire detector 10 may be configured to determine the power that can be consumed for monitoring in advance, but by stopping the second smoke sensor as in the present embodiment, it is possible to prevent the power consumption from exceeding a predetermined value.
In addition, according to the present embodiment, the type of smoke is determined based on the output ratio R of the first output signal S1 and the second output signal S2. Therefore, the fire can be accurately determined according to the type of smoke.
In addition, according to the present embodiment, in the case where the rate of increase of the output from the thermal sensor 7 is smaller than the threshold value, the smoke density is detected based on the output of the first smoke sensor. Therefore, the fire monitoring based on the detection of smoke density is not interrupted.
Further, according to the present embodiment, when the rate of increase of the output from the thermal sensor 7 is smaller than the threshold value, the operation of the second smoke sensor is stopped, and at least one of the write processing, the read processing, and the failure determination processing is performed on the memory 5. Since the operation of the second smoke sensor is stopped, even if the write processing or the like is performed to the memory 5, it is possible to suppress the power consumption of the entire fire detector 10 from becoming excessive.
The embodiments of the present invention are not limited to the above embodiments, and various modifications can be made to the above embodiments. For example, although the case where the control unit 4 of the fire detector 10 performs the fire detection process has been described, the fire signal receiver 20 may perform the fire detection process. In this case, the fire detector 10 transmits the output from the light receiving element 3 to the fire signal receiver 20 via a transmission line, and the fire signal receiver 20 corrects the acquired output of the light receiving element 3 and determines whether or not a fire has occurred using the corrected output. In this manner, the operational effects described in the above embodiments can be obtained.
In addition, in the above-described embodiment, an example is shown in which the output of the thermal sensor 7 that detects heat is used for detection of a fire. That is, in the embodiment, the detection result of the heat sensor 7 is used for the detection of the fire by heat, and is effectively used for the stop control of the operation of the second smoke sensor. However, the output of the thermal sensor 7 may not be used for fire detection. In this case, the fire is detected based on the outputs of the first smoke sensor and the second smoke sensor.
In the above-described embodiment, an example has been described in which whether or not to stop the operation of the second smoke sensor is determined based on the result of comparison between the rate of increase in the output from the thermal sensor 7 and the threshold value. Instead of the rate of increase in the output from the heat sensor 7, the output from the heat sensor 7 may be used to determine whether or not to stop the operation of the second smoke sensor. In this case, when the value of the output from the thermal sensor 7 is smaller than the threshold value, the operation of the second smoke sensor is stopped. The threshold value compared with the value of the output from the thermal sensor 7 is a value smaller than the thermal fire threshold value. In this way, by stopping the operation of the second smoke sensor, the power consumption of the fire detector 10 can be reduced.
Claims (3)
1. A fire detector is characterized in that the fire detector is provided with a detector body,
the fire detector is provided with:
a thermal sensor;
a first smoke sensor;
a second smoke sensor; and
and a control unit that stops the operation of the second smoke sensor and detects smoke density based on the output from the first smoke sensor when a rate of increase of the output from the heat sensor is smaller than a threshold value, and activates the second smoke sensor and detects smoke density based on the outputs from the first smoke sensor and the second smoke sensor when the rate of increase of the output from the heat sensor is larger than the threshold value.
2. A fire detector as claimed in claim 1,
the control part
Determining a fire if the output of the thermal sensor is above a thermal fire threshold,
in the case where the output of the thermal sensor is below a thermal fire threshold, it is determined whether the rate of rise of the output from the thermal sensor is greater than the threshold.
3. A fire detector as claimed in claim 1 or 2,
the fire detector is provided with a memory device,
the control unit performs a write process to the memory, a read process from the memory, or a failure determination process when the rate of increase in the output from the thermal sensor is smaller than the threshold value.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2018117277A JP2019219956A (en) | 2018-06-20 | 2018-06-20 | Fire detector |
| JP2018-117277 | 2018-06-20 |
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| CN110619730A CN110619730A (en) | 2019-12-27 |
| CN110619730B true CN110619730B (en) | 2021-07-16 |
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| CN112750267A (en) * | 2020-12-29 | 2021-05-04 | 西南交通大学 | Forest fire monitoring system based on bacterial power supply and control method |
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| CN101783056A (en) * | 2010-02-10 | 2010-07-21 | 西安博康电子有限公司 | Point-type complex fire detector based on mechanical type temperature sensing element and alarm method thereof |
| CN202512700U (en) * | 2012-03-07 | 2012-10-31 | 科达士(澳大利亚)消防有限公司 | Air-breathing fire detection device |
| CN102654934A (en) * | 2012-05-09 | 2012-09-05 | 公安部沈阳消防研究所 | Optical smoke-sensing detection test device and test method thereof |
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| CN107358778A (en) * | 2017-07-28 | 2017-11-17 | 昆明理工大学 | A kind of fire-alarm of combination KNN algorithms |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2019219956A (en) | 2019-12-26 |
| CN110619730A (en) | 2019-12-27 |
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