CN102721667A - Optical interference type intelligent gas sensor - Google Patents
Optical interference type intelligent gas sensor Download PDFInfo
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- CN102721667A CN102721667A CN2012102252991A CN201210225299A CN102721667A CN 102721667 A CN102721667 A CN 102721667A CN 2012102252991 A CN2012102252991 A CN 2012102252991A CN 201210225299 A CN201210225299 A CN 201210225299A CN 102721667 A CN102721667 A CN 102721667A
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Abstract
The invention discloses an optical interference type intelligent gas sensor, which comprises an optical interferometer, a master control panel and a display panel. The optical interferometer is used for measuring gas concentration and ambient temperature of a point to be measured; a master control circuit is used for performing filtering, linearization and temperature compensation; and gas concentration value is displayed in real time through a display circuit, and is uploaded to a monitoring system in a frequency signal mode; and when the gas concentration exceeds a set alarm point, the optical interference type intelligent gas sensor can automatically give an alarm with sound and light; parameters such as the alarm point, a power failure point and a healing point can be set through infrared remote control; and zero drift and sensitivity drift of the sensor can be corrected. The optical interference type intelligent gas sensor is high in measurement precision, high in stability, long in calibration period and simple in correction, can be used for measuring concentration of different gases, and is beneficial to accurate measurement and automatic monitoring of the gases.
Description
Technical field
The invention belongs to the Gas Thickness Detecting Technology field, relate in particular to, the intelligent gas sensor of utilization wave optics, microprocessor, intelligent information processing technology based on interference of light principle.
Background technology
In the coal mining accident, the number of this blast death of invar is maximum, and gas is the main reason that causes coal mining accident.At present, the major equipment of gas surveying is based on thermocatalytic gas indicator in the mine, but because the intrinsic property of heat catalytic element, the poor stability of this detecting device, calibration cycle weak point; And the light interference type firedamp sensor has measuring accuracy height, stability is strong, the calibration cycle is long advantage.In the gas context of detection based on the interference of light, Chinese patent 200820039611.7 " light interference type methane analyzer " has designed a kind of optics methane analyzer that is convenient for measuring, is beneficial to downhole operations; Patent 200810195648.3 " interference of light methane detecting device " is improved used light path and air chamber and extraneous contact method, but needs to obtain gas concentration through eye-observation interference of light striped, and reading is directly perceived, complicated operation; Patent 9120528.3 " intelligent interference of light gas detector " utilizes microprocessor that data are handled, but does not consider the influence to measurement result of ambient temperature, air pressure; Chinese patent 201010107767.6 " gas density intelligent test system and method ", environment temperature and air pressure change are considered to external world, have improved the measurement accuracy, but it can not carry out infrared remote control, no on-the-spot concentration demonstration, and calibration is complicated.
In a word; In existing light interference type gas density monitoring technology and method; Sensor can not show gas density, calibration complicacy intuitively, can not be connected to the mine supervision system; And can only measure methane gas concentration, these robotizations accurately that all are unfavorable for harmful gases such as gas under the mine detect.
Summary of the invention
The object of the invention is intended to overcome the defective of above-mentioned existing light interference type gas concentration monitoring aspect; Designed a kind of intelligent gas sensor based on interference of light principle; Not only kept the advantage that traditional light interference type gas sensor is simple to operate, precision is high, stability is strong, the calibration cycle is long; The function of also added digital demonstration, infrared remote control, communicating by letter with supervisory system; Not only can real-time measurement show current gas density, can also be with the gas density and the real-time mine supervision system that uploads to of temperature information of measurement point; Can not only measure gas density, can also select to measure other gas concentrations, like CO2, C2H6, SO2, NO2, C2H2, NH3, H2S etc.; Mode through infrared remote control can realize alarm set point, outage point, the isoparametric setting of telegram in reply point, can also zero point drift, sensitivity drift be proofreaied and correct, make be provided with, trimming process is simpler.
The present invention realizes through following technical scheme: a kind of light interference type intelligent gas sensor comprises interference of light meter, master control board, display board, IR remote controller.It is characterized in that: interference of light meter comprises that light source, condenser, the back side are coated with the level crossing of total reflection film, air chamber, refractive prism, compensating prism, photoelectric conversion device, standard air bag; Being separated by the copper wall level of handling through melanism in the middle of the said air chamber, form the two parts that are parallel to each other, is respectively gas specimen chamber and standard air chamber; The gas specimen chamber is connected to air intake opening through the filter chamber; The standard air chamber is connected to the standard air bag with kapillary, for the kapillary of coiling, uses the cock and the atmosphere that have aperture in the standard air bag; The rear and front end of the air chamber that the gentle specimen chamber of standard air chamber is formed is provided with respectively and copper wall and the orthogonal high transmission plane lens of pedestal; Level crossing and refractive prism that the said back side is coated with total reflection film also are arranged in the outer rear and front end of air chamber, promptly are arranged on identical two ends with high transmission plane lens, and level crossing and air chamber that the back side is coated with total reflection film are the 45 positioned opposite; Light source also becomes 45 ° of placements with the level crossing that the back side is coated with total reflection film; And at the opposite side of air chamber, condenser is arranged between light source and the level crossing, and said compensating prism is arranged between level crossing and the air chamber; The light that is sent by light source is coated with the level crossing of total reflection film with the 45 incident back side after condenser is assembled; Level crossing is divided into two-beam with light; Wherein Ray Of Light passes the gas specimen chamber, and another bundle light passes the standard air chamber, and the two-beam line that passes air chamber passes the standard air chamber respectively once more after the refractive prism refraction; The arrival level crossing can synthesize a branch of light again after passing compensating prism then; The interference fringe that produces arrives photoelectric conversion device after flat mirror reflects, convert electric signal to and be transferred to master control board.
Master control board comprise signal processing circuit, analog-to-digital conversion module, microprocessor, with supervisory system communication module, power module, toggle switch, reset key; Said signal processing circuit comprises LPF, calculus of differences unit, and the signal voltage range after the processing is fit to the analog to digital converter collection; Said analog-to-digital conversion module comprises analog to digital converter and analog to digital converter reference source; Said microprocessor is the microprocessor that has internal program memory and internal data memory, the signal of gathering is carried out digital filtering, linearization and temperature compensation handle; Said and supervisory system communication module is the frequency output driving circuit by microprocessor control; Said power module is system's power supply with input voltage after voltage stabilizing, after accurate voltage stabilizing, be the photoelectric switching circuit power supply; Said toggle switch is in order to select mode of operation, the range ability of equipment; Said reset key is the state of homing device to Default Value.
Display board comprises display module, infrared remote control module, sound and light alarm module, and said display module is charactron and charactron driving circuit; Said infrared remote control module is infrared remote receiver and driving thereof; Said sound and light alarm module is light emitting diode and active hummer.
IR remote controller adopts small-sized telepilot, can carry out alarm set point, outage point, the isoparametric setting of telegram in reply point through infrared remote control, can switch in debugging and duty, can also proofread and correct zero point drift, sensitivity drift.
Light source is handled by the high bright light emitting diode Precision Machining of monochrome and is formed; Make the LED top form the smooth flat of smooth, smooth, no naked eyes visible texture; Can make LED become concentrated, reduce the loss of light, increase the light quantity in the light path at the light of front end emission; And the brass shell through the melanism processing of band slit, prevent that unnecessary light from penetrating; Said light source adopts the power supply of high stability precision voltage regulator.
In the light path between level crossing and air chamber, be provided with the compensating prism of installing through rotating shaft, said compensating prism can rotate or swing around the shaft, realizes optical path compensation and regulates the back locking.
Photoelectric conversion device is made up of photoelectric switching circuit and two L type movable components, and said photoelectric switching circuit comprises photoelectric sensor, temperature sensor; Said L type movable component can be regulated up and down and interference of light striped is radiated at convert on the photoelectric sensor electric signal output.
Interference of light meter links to each other with master control board through winding displacement, and master control board is inserted in through plug connector is folded with display board.
The workflow of interfere type intelligent gas sensor does, at first hardware carried out initialization after powering on, and from EEPROM, reads alarm set point, outage point, telegram in reply point, password value, linear parameter and temperature compensation parameter; The judgment task pattern if be duty, is then gathered interference of light meter output voltage values, temperature value then, the magnitude of voltage of gathering is carried out the linearization process trip temperature compensation of going forward side by side obtain current gas concentration value; The alarm set point of gas concentration value that obtains and setting is compared,, then get into next circulation and continue judgment task pattern if less than alarm set point; If greater than alarm set point, then carry out the sound and light alarm operation, and judge whether greater than the outage point; If, then export power-off signal, if less than the outage point greater than the outage point; Then whether interpretation had carried out power down process, if cut off the power supply, further whether the interpretation gas concentration value is less than the telegram in reply point; If less than the telegram in reply point, the operation of then sending a telegram in reply judges whether greater than alarm set point after continuing then interference of light meter output voltage values and temperature value gathered and handle, point cuts off the power supply successively; If mode of operation then gets into parameter state is set for state is set, at first need input four passwords, if the password input error is returned after then pointing out error message and showing the bad password of importing and continued the judgment task pattern; If the password input is correct, then select the parameter of required setting, parameter judges whether to be provided with success after completion is set; If failure is set; Then show error message and return continuation judgment task pattern,, newly-installed parameter is write EEPROM substitute original parameter and show successful information if success is set.
When gas concentration changes; Gas refracting index in the gas specimen chamber changes; Thereby two light optical path differences of passing gas specimen chamber and standard air chamber change, and the interference fringe of generation is moved, and make the voltage signal of photoelectric sensor output change; Voltage signal is transferred to the signal conditioning circuit in the master control board through winding displacement; Become digital signal through signal filtering, conditioning back by the analog to digital converter collection of microprocessor, microprocessor is gathered the signal of temperature sensor simultaneously, the voltage signal that collects and temperature signal are passed through digital filtering, linearization process after; Through sensor Data Fusion voltage signal is carried out temperature compensation, obtain the gas concentration value of measurement point at last.This gas concentration value is shown on charactron through display driver circuit, simultaneously with this concentration value and temperature value with frequency signal pass to supervisory system in form, if this gas concentration value surpasses the alarm set point of setting, will produce sound and light alarm.Can set parameters such as alarm set point, outage point and telegram in reply point through infrared remote control, can also carry out the sensor calibration through the mode of infrared remote control.
Light interference type intelligent gas sensor of the present invention compared with prior art has following advantage: intuitive and accurate demonstration gas density, when having overcome traditional interference of light gas indicator and having measured the collimation error big, detect shortcoming such as data computation complicacy; Can communicate by letter with supervisory system; Not only the gas density of measurement point is measured, also measured its environment temperature, and utilize software that temperature is compensated, make accuracy of measurement high, metering performance is stable, reliable, and the calibration cycle is long; Infrared remote control is provided with parameters such as alarm set point, outage point, telegram in reply point, carries out sensor zero point, sensitivity correction; Multiple functional, a tractor serves several purposes both can detect gas density, can also select to measure other gas concentrations, and like CO2, C2H6, SO2, NO2, C2H2, NH3, H2S; Except that measure gas concentrations, also can be used as digital thermometer and use.
Description of drawings
Fig. 1 is the total theory diagram of the system of light interference type intelligent gas sensor of the present invention;
Fig. 2 is the overall construction drawing of interference of light meter of the present invention;
Fig. 3 is photoelectric conversion device location regulatory element figure;
Fig. 4 is the workflow diagram of light interference type intelligent gas sensor of the present invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, to further explain of the present invention.
Fig. 1 is the structured flowchart of light interference type intelligent gas sensor of the present invention.With reference to Fig. 1, this sensing system comprises interference of light meter, master control board, display board, IR remote controller.
Interference of light meter comprises light source, light path part, photoelectric sensor and temperature collect module.
Master control board comprise signal processing circuit, analog-to-digital conversion module, microprocessor, with supervisory system communication module, power module, toggle switch, reset key.Said signal processing circuit comprises active low-pass filter, calculus of differences unit, and the signal voltage range after the processing is that 0V～2.5V is fit to the analog to digital converter collection; Said analog-to-digital conversion module comprises 12 analog to digital converters and 2.5V analog to digital converter reference source; Said microprocessor is the microprocessor that has internal program memory and internal data memory, and the signal of gathering is carried out digital filtering, linearization and temperature compensation; Said and supervisory system communication module is the 200Hz～1000Hz frequency output driving circuit by microprocessor control; Said power module uses 9V～24V input after voltage stabilizing, to be system's power supply, after accurate voltage stabilizing, is the photoelectric switching circuit power supply; Said toggle switch is in order to select mode of operation, the range ability of equipment; Said reset key is the state of homing device to Default Value.
Display board comprises display module, infrared remote control module, sound and light alarm module, and said display module comprises 5 charactrons and charactron driving circuit; Said infrared remote control module is infrared remote receiver HS0038 and driving thereof; Said sound and light alarm module is high bright light emitting diode and the active hummer of yowl sound piezoelectric type;
IR remote controller is 21 key small ultra-thin telepilots, can carry out the setting of alarm set point, outage point, telegram in reply point through infrared remote control, can switch in debugging and duty, can also proofread and correct zero point drift, sensitivity drift.
When gas concentration changes; Light forms interference fringe through after the light path part on photoelectric switching circuit; Photoelectric switching circuit converts light signal to electric signal, and electric signal converts digital signal into by analog-to-digital conversion module after the signal processing circuit conditioning of master control board then; Master controller is gathered digital signal obtains gas after digital filtering, linearization process and temperature compensation concentration value; At last with this concentration value through on charactron, showing behind the display driver, and judge whether to surpass alarm set point and outage point, simultaneously with this concentration value through frequency output module output frequency signal to supervisory system.
Fig. 2 is the structural drawing (Fig. 2 left hand view is the vertical view of interference of light meter MECH plot) of interference of light meter.As shown in Figure 2; The light path part of interference of light meter comprises that light source 1, condenser 2, the back side are coated with the level crossing 3 of total reflection film, air chamber, refractive prism 6, compensating prism 7, photoelectric conversion device, is separated by copper wall 18 levels of handling through melanism in the middle of the said air chamber, forms the two parts that are parallel to each other; Be respectively gas specimen chamber 4 and standard air chamber 5; Gas specimen chamber 4 15 is connected to air intake opening 16 through the filter chamber, and standard air chamber 5 usefulness kapillaries 9 are connected to standard air bag 10, is the kapillaries of coiling in the standard air bag 10; Use has the cock 17 and the atmosphere of aperture; The rear and front end of the air chamber that standard air chamber and gas specimen chamber are formed is provided with respectively and copper wall 18 and pedestal 19 orthogonal high transmission plane lens 14, and the level crossing 3 that the said back side is coated with total reflection film also is arranged in the outer rear and front end of air chamber with refractive prism 6, promptly is arranged on identical two ends with high transmission plane lens 14; The level crossing 3 that the back side is coated with total reflection film is the 45 positioned opposite with air chamber; The front and the air chamber of level crossing are relative, and light source 1 also becomes the 45 positioned opposite with the level crossing 3 that the back side is coated with total reflection film, but at the opposite side of air chamber; Condenser 2 is arranged between light source 1 and the level crossing 3, and said compensating prism 7 is arranged between level crossing 3 and the air chamber; The light that is sent by light source 1 is coated with the level crossing 3 of total reflection film with the 45 incident back side after condenser 2 is assembled; Level crossing 3 is divided into two-beam with light, and wherein Ray Of Light passes gas specimen chamber 4, and another bundle light passes standard air chamber 5; The two-beam line that passes air chamber passes standard air chamber 5 respectively once more after refractive prism 6 reflections; Pass compensating prism 7 back arrival level crossings 3 then and can synthesize a branch of light again, produce interference fringe, after flat mirror reflects, arrive photoelectric conversion device.
Light source is handled by the high bright light emitting diode Precision Machining of monochrome and is formed; Make the LED top form the smooth flat of smooth, smooth, no naked eyes visible texture; Can make LED become concentrated, reduce the loss of light, increase the light quantity in the light path at the light of front end emission; And be with brass shell outward through the band slit of melanism processing, prevent that unnecessary light from penetrating; Said light source adopts the power supply of high stability precision voltage regulator.
In the light path between level crossing and air chamber, be provided with the compensating prism of installing through rotating shaft, said compensating prism can rotate or swing around the shaft, realizes optical path compensation and regulates the back locking.
Like Fig. 1, Fig. 2 and shown in Figure 3, photoelectric conversion device is made up of photoelectric switching circuit 11 and two L type movable components, and said photoelectric switching circuit comprises photoelectric sensor 13, temperature sensor 8; Said L type movable component comprises the L type element 20, L type element 22 of trough of belt 23, the element 21 of band vertical slots 24, can move left and right element 20 and up-down adjustment element 21, thereby being radiated at, interference of light striped converts electric signal output on the photoelectric sensor to.
Interference of light meter links to each other with master control board through winding displacement, and master control board is inserted in through plug connector is folded with display board.
As shown in Figure 4, the workflow of light interference type intelligent gas sensor of the present invention does, at first hardware carried out initialization after powering on, and from EEPROM, reads alarm set point, outage point, telegram in reply point, password value, linear parameter and temperature compensation parameter; The judgment task pattern if be duty, is then gathered interference of light meter output voltage values, temperature value then, the magnitude of voltage of gathering is carried out the linearization process trip temperature compensation of going forward side by side obtain current gas concentration value; The alarm set point of gas concentration value that obtains and setting is compared,, then get into next circulation and continue judgment task pattern if less than alarm set point; If greater than alarm set point, then carry out the sound and light alarm operation, and judge whether greater than the outage point; If, then export power-off signal, if less than the outage point greater than the outage point; Then whether interpretation had carried out power down process, if cut off the power supply, further whether the interpretation gas concentration value is less than the telegram in reply point; If less than the telegram in reply point, the operation of then sending a telegram in reply judges whether greater than alarm set point after continuing then interference of light meter output voltage values and temperature value gathered and handle, point cuts off the power supply successively; If mode of operation then gets into parameter state is set for state is set, at first need input four passwords, if the password input error is returned after then pointing out error message and showing the bad password of importing and continued the judgment task pattern; If the password input is correct, then select the parameter of required setting, parameter judges whether to be provided with success after completion is set; If failure is set; Then show error message and return continuation judgment task pattern,, newly-installed parameter is write EEPROM substitute original parameter and show successful information if success is set.
The present invention is based on interference of light principle design; The light emitted bright dipping; The level crossing effect that is coated with total reflection film overleaf forms the two-beam line down; Get into the refractive prism back reflection through gas specimen chamber and standard air chamber respectively and return the standard air chamber, pass through the level crossing effect at last once more, the two-beam line can synthesize Ray Of Light again.When the gas density ρ in adopting air chamber changed, the refractive index n of gas (CH4) changed, thereby produced optical path difference Δ L=(n (CH4)-n (air)) * L through the two-beam line of gas air chamber and standard air chamber, and wherein L is an air chamber length.Because the existence of this optical path difference when the irradiate light of junction is to photoelectric sensor again, forms interference fringe, along with the change of gas density ρ, optical path difference Δ L changes, and is mobile thereby interference fringe is sent out into, makes the electric signal of photoelectric sensor output change.The electric signal process active low-pass filter that changes, conditioning are after the analog to digital converter collection becomes digital signal; After microprocessor middle longitude propertyization, temperature compensation, utilize charactron to demonstrate gas concentration; To be worth simultaneously pass to supervisory system in form with frequency signal; When gas concentration surpasses the alarm set point of setting, produce sound and light alarm.
According to corresponding relation n (the gas)=k*n (CH4) of methane refractive index n (CH4) with other other refractive index ns (gas), the optical path difference Δ L=that produces when obtaining measuring other gases (n (gas)-n (air)) * L=(k*n (CH4)-n (air)) * L.Utilize IR remote controller that different coefficient k is set, can measure gas with various concentration.
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; Be not limited to the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a light interference type intelligent gas sensor comprises interference of light meter, master control board, display board, it is characterized in that:
Interference of light meter comprises that light source, condenser, the back side are coated with the level crossing of total reflection film, air chamber, refractive prism, compensating prism, photoelectric conversion device, standard air bag; Said air chamber is separated by the copper wall level of handling through melanism and forms the two parts that are parallel to each other; Be respectively gas specimen chamber and standard air chamber, the gas specimen chamber is connected to air intake opening through the filter chamber, and the standard air chamber is connected to the standard air bag with kapillary; Kapillary for coiling in the standard air bag; Use has the cock and the atmosphere of aperture, and the rear and front end of the air chamber that standard air chamber and gas specimen chamber are formed is provided with respectively and copper wall and the orthogonal high transmission plane lens of pedestal, and level crossing and refractive prism that the said back side is coated with total reflection film also are arranged in the outer rear and front end of air chamber; Promptly be arranged on identical two ends with high transmission plane lens; Level crossing and air chamber that the back side is coated with total reflection film are the 45 positioned opposite, and light source also becomes 45 to place relatively with the level crossing that the back side is coated with total reflection film, but at the opposite side of air chamber; Condenser is arranged between light source and the level crossing, and said compensating prism is arranged between level crossing and the air chamber; The light that is sent by light source incides the level crossing that the back side is coated with total reflection film with 45 after condenser is assembled; Level crossing is divided into two-beam with light; Wherein Ray Of Light passes the gas specimen chamber, and another bundle light passes the standard air chamber, and the two-beam line that passes air chamber passes the standard air chamber respectively once more after the refractive prism reflection; The arrival level crossing can synthesize a branch of light again after passing compensating prism then; The interference fringe that produces arrives photoelectric conversion device after flat mirror reflects, convert electric signal to and be transferred to master control board;
Master control board is carried out LPF, conditioning after the analog to digital converter collection becomes digital signal to the electric signal that receives, and after digital filtering, linearization, temperature compensation, utilizes display board to show again.
2. light interference type intelligent gas sensor according to claim 1; Said master control board further comprises: signal processing circuit, analog-to-digital conversion module, microprocessor, with supervisory system communication module, power module, toggle switch, reset key; Wherein said signal processing circuit comprises LPF, calculus of differences unit, and the signal voltage range after the processing is fit to the analog to digital converter collection; Said analog-to-digital conversion module comprises analog to digital converter and analog to digital converter reference source; Said microprocessor is the microprocessor that has internal program memory and internal data memory, the signal of gathering is carried out digital filtering, linearization and temperature compensation handle; Said and supervisory system communication module is the frequency output driving circuit by microprocessor control; Said power module is system's power supply with input voltage after voltage stabilizing, after accurate voltage stabilizing, be the photoelectric switching circuit power supply; Said toggle switch is in order to select mode of operation, the range ability of equipment; Said reset key is the state of homing device to Default Value.
3. light interference type intelligent gas sensor according to claim 2, said display board comprise display module, infrared remote control module, sound and light alarm module, and said display module comprises charactron and charactron driving circuit; Said infrared remote control module is infrared remote receiver and driving thereof; Said sound and light alarm module is light emitting diode and active hummer.
4. light interference type intelligent gas sensor according to claim 3; It further comprises IR remote controller; This IR remote controller switches in debugging and duty, and zero point drift, sensitivity drift is proofreaied and correct through the setting of infrared remote control realization alarm set point, outage point, telegram in reply point.
5. light interference type intelligent gas sensor according to claim 4; Wherein said light source is handled by the high bright light emitting diode Precision Machining of monochrome and is formed; Make the LED top form the smooth flat of smooth, smooth, no naked eyes visible texture; And being with brass shell outward through the band slit of melanism processing, said light source adopts the power supply of high stability precision voltage regulator.
6. light interference type intelligent gas sensor according to claim 5; Wherein in the light path between said level crossing and air chamber; Be provided with the compensating prism of installing through rotating shaft, said compensating prism can rotate or swing around the shaft, realizes optical path compensation and regulates the back locking.
7. light interference type intelligent gas sensor according to claim 6; Wherein said photoelectric conversion device is made up of photoelectric switching circuit and two L type movable components; Said photoelectric switching circuit comprises photoelectric sensor, temperature sensor, and said L type movable component is regulated up and down and interference of light striped is radiated at convert on the photoelectric sensor electric signal output.
8. light interference type intelligent gas sensor according to claim 7, wherein interference of light meter links to each other with master control board through winding displacement, and master control board is inserted in through female the folding of double row's faller gill with display board.
9. light interference type intelligent gas sensor according to claim 8, wherein this sensor at first carries out initialization to hardware after powering on, and from EEPROM, reads alarm set point, outage point, telegram in reply point, password value, linear parameter and temperature compensation parameter; The judgment task pattern if be duty, is then gathered interference of light meter output voltage values, temperature value then, the magnitude of voltage of gathering is carried out the linearization process trip temperature compensation of going forward side by side obtain current gas concentration value; The alarm set point of gas concentration value that obtains and setting is compared,, then get into next circulation and continue judgment task pattern if less than alarm set point; If greater than alarm set point, then carry out the sound and light alarm operation, and judge whether greater than the outage point; If, then export power-off signal, if less than the outage point greater than the outage point; Then whether interpretation had carried out power down process, if cut off the power supply, further whether the interpretation gas concentration value is less than the telegram in reply point; If less than the telegram in reply point, the operation of then sending a telegram in reply judges whether greater than alarm set point after continuing then interference of light meter output voltage values and temperature value gathered and handle, point cuts off the power supply successively.
10. light interference type intelligent gas sensor according to claim 9; If wherein mode of operation is for being provided with state; Then get into parameter state is set; At first need input four passwords, if the password input error is returned after then pointing out error message and showing the bad password of importing and continued the judgment task pattern; If the password input is correct, then select the parameter of required setting, parameter judges whether to be provided with success after completion is set; If failure is set; Then show error message and return continuation judgment task pattern,, newly-installed parameter is write EEPROM substitute original parameter and show successful information if success is set.
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| CN201210225299.1A CN102721667B (en) | 2012-06-29 | 2012-06-29 | Optical interference type intelligent gas sensor |
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| CN103234906A (en) * | 2013-04-15 | 2013-08-07 | 贵州省教育厅 | Infrared methane determination device for mining emergency risk avoiding system |
| CN106093136A (en) * | 2016-06-06 | 2016-11-09 | 深圳市谷粒科技有限公司 | A kind of application algorithm of semiconductor gas sensor |
| CN108132066A (en) * | 2017-12-25 | 2018-06-08 | 天地（常州）自动化股份有限公司 | A kind of design method of mine sensors |
| CN113542537A (en) * | 2020-04-13 | 2021-10-22 | 晋城三赢精密电子有限公司 | Camera module |
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