CN203324179U - High-sensitivity portable gas detection instrument based on NDIR (Non-Dispersive Infra-Red) principle - Google Patents
High-sensitivity portable gas detection instrument based on NDIR (Non-Dispersive Infra-Red) principle Download PDFInfo
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- CN203324179U CN203324179U CN2013202773378U CN201320277337U CN203324179U CN 203324179 U CN203324179 U CN 203324179U CN 2013202773378 U CN2013202773378 U CN 2013202773378U CN 201320277337 U CN201320277337 U CN 201320277337U CN 203324179 U CN203324179 U CN 203324179U
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- pyroelectric detector
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Abstract
The utility model discloses a high-sensitivity portable gas detection instrument based on an NDIR (Non-Dispersive Infra-Red) principle. The high-sensitivity portable gas detection instrument comprises a sensor and a main circuit, wherein the sensor comprises an optical cavity, an infrared light source, a pyroelectric detector and a thermistor; the infrared light source and the pyroelectric detector are positioned in the optical cavity; the thermistor carries out temperature compensation on the pyroelectric detector; the main circuit comprises a power supply circuit and a microprocessor system; the signal input end of the microprocessor system is connected with an infrared light source driving system, a measuring channel filtering and amplifying circuit, a reference channel filtering and amplifying circuit, a thermistor circuit and an EEPROM (Electrical Erasable Programmable Read Only Memory) inner data downloading circuit, and the signal output end of the microprocessor system is connected with a crystal timing circuit, an audible and visual alarm circuit, and the like. The high-sensitivity portable gas detection instrument disclosed by the utility model can be carried by operators, mobile workers and field managers in an air return way, on a mining working face and a gas drainage and electromechanical equipment cave chamber and is used for continuously or discontinuously detecting automatically, displaying the methane concentration value and environmental temperature value of operating environment gas and recording in an inner storage in real time.
Description
Technical field
The utility model relates generally to the gas detecting instrument field, relates in particular to a kind of high-sensitivity portable gas detecting instrument based on the NDIR principle.
Background technology
Along with the fast development of coal industry, coal in China safety in production hidden danger also becomes increasingly conspicuous, and is mainly manifested in coal-mine gas and exceeds standard seriously, and therefore, in Safety of Coal Mine Production, gas (CH is monitored on reliable, accurate, real-time on-site ground
4) concentration is the important means that the prevention Gas Explosion Accidents in Coal Mines occurs.The automatic detection CH commonly used in the market
4Instrument, classify and mainly can be divided into catalytic combustion-type, infrared light spectral pattern, Semiconductor gas sensors type, gas chromatography type and optical fiber measurement type etc. by its principle, that wherein the most generally use is catalytic combustion-type CH
4Gas detecting instrument, but because its sensor itself exists easily affected by environment, reliability and poor accuracy, serviceable life is short, maintenance cost is high, easily produce all drawbacks such as catalysis is poisoning, belong to and fall behind and be about to obsolete product.And the infrared spectrum absorption-type methane detector based on the NDIR technology is one of current study hotspot, it has avoided those drawbacks of old catalytic combustion type sensor from principle, have that precision is high, reliability and selectivity good, not poisoning, be subject to that the environmental interference factor is little, long service life and without advantages such as frequent adjustment, and can realize intelligent real time monitoring and functions such as analysis continuously.But there is sensor detection sensitivity in infrared light spectral pattern detector in the market not high or sensor, down-hole that depend on external import install difficulty, school, down-hole zero difficulty, be subject to the defect such as temperature and humidity impact.
The utility model content
The utility model provides a kind of high-sensitivity portable gas detecting instrument based on the NDIR principle in conjunction with the problem existed at present.
The technical scheme that realizes above-mentioned purpose is:
A kind of high-sensitivity portable gas detecting instrument based on the NDIR principle, it is characterized in that: include sensor, main circuit, the infrared light supply that described sensor comprises optical cell and is positioned at optical cell inside, pyroelectric detector and be the thermistor of pyroelectric detector temperature compensation, wherein in pyroelectric detector, be integrated with EEPROM, pyroelectric detector includes two input channels respectively as measuring passage, reference channel, measure passage and be provided with the narrow band pass filter that centre wavelength is 3.39 μ m places, reference channel is provided with the narrow band pass filter that centre wavelength is 3.9 μ m places, described main circuit includes power circuit, microprocessor system, the signal input part of microprocessor system is connected with the infrared light supply drive system, measure channel filtering and amplifying circuit, reference channel filtering and amplifying circuit, thermosensitive resistor and circuit, data download circuit in EEPROM, the signal output part of microprocessor system is connected with the crystal timing circuit, sound light alarming circuit, the RS232 interface circuit, liquid crystal display circuit, digital pipe display circuit, data storage circuitry, measure channel filtering and amplifying circuit, the signal input part of reference channel filtering and amplifying circuit is connected with sensor, power circuit is each circuit supply.
Described a kind of high-sensitivity portable gas detecting instrument based on the NDIR principle is characterized in that: described infrared light supply adopts the osram lamp of the low drift of infrared spectrum.
Described a kind of high-sensitivity portable gas detecting instrument based on the NDIR principle, it is characterized in that: described optical cell is gold-plated surface, optical cell is spliced by the stainless (steel) wire sintered sheets, the top cover of optical cell has stainless steel sleeve or steel pipe socket, hole is arranged at stainless steel sleeve or steel pipe socket top, and gas is diffused into sensor internal by the hole at stainless (steel) wire sintered sheets and stainless steel sleeve or steel pipe socket top.
Advantage of the present utility model and effect are as follows:
The utility model at return airway, getting working face, draw out methane and the operating personnel of electromechanical equipment chamber, flow staff and site administrator wear with oneself, in order to continuously or intermittently automatically detect, show in operating environment gas methane concentration value and ambient temperature value and can be recorded in real time in internal storage.
The pyroelectric sensor integrated thermistor carries out temperature compensation, can to sensor probe, be demarcated and school zero by the parameter that reads and change electricallyerasable ROM (EEROM) in sensor (EEPROM).The microprocessor system acquisition process that is carried 16 ADC and gather through the double-channel signal value by sensor output of filtering and amplification and temperature value, final each parameter of storage also shows current concentration value, can be connected with computing machine by the RS232 interface after gug and will detect data derivation analysis.Automatic sound-light alarm, under-voltage indication and the functions such as automatic shutdown and instrument self check when it also has Real Time Clock Display, the demonstration of real-time voltage value, alarming value setting, methane content exceeding preset limit.
The accompanying drawing explanation:
The theory diagram that Fig. 1 is main circuit of the present utility model.
The sectional view that Fig. 2 is sensor of the present utility model.
The pin arrangements backplan that Fig. 3 is sensor of the present utility model.
Fig. 4 is filtering of the present utility model and amplifying circuit schematic diagram.
Embodiment:
As Fig. 1, shown in 2, a kind of high-sensitivity portable gas detecting instrument based on the NDIR principle, include sensor, main circuit, the infrared light supply 2 that sensor comprises optical cell 1 and is positioned at optical cell 1 inside, pyroelectric detector 3 and be the thermistor 4 of pyroelectric detector 3 temperature compensations, wherein in pyroelectric detector 3, be integrated with EEPROM, pyroelectric detector 3 includes two input channels respectively as measuring passage, reference channel, measure passage and be provided with the narrow band pass filter that centre wavelength is 3.39 μ m places, reference channel is provided with the narrow band pass filter that centre wavelength is 3.9 μ m places, main circuit includes power circuit 5, microprocessor system 6, the signal input part of microprocessor system 6 is connected with infrared light supply drive system 7, measure channel filtering and amplifying circuit 8, reference channel filtering and amplifying circuit 9, thermosensitive resistor and circuit 10, data download circuit 11 in EEPROM, the signal output part of microprocessor system 6 is connected with crystal timing circuit 12, sound light alarming circuit 13, RS232 interface circuit 14, liquid crystal display circuit 15, digital pipe display circuit 16, data storage circuitry 17, measure channel filtering and amplifying circuit 8, the signal input part of reference channel filtering and amplifying circuit 9 is connected with sensor 3, power circuit 5 is each circuit supply.
Gather port through filtering with after amplifying with the ADC of thermosensitive resistor and circuit 10 access microprocessor K60 by the measurement passage of pyroelectric detector 3 and the signal of reference channel output; In EEPROM, data also are connected with microprocessor signals collection port; And the infrared light supply driving circuit 7 that microprocessor port and field effect transistor are connected to sensor probe provides the square wave of 2HZ; External crystal timing circuit 12 provides major clock and auxiliary clock for microprocessor; Each signal value of microprocessor system pick-up transducers output obtains current concentration value and shows in real time at digital pipe display circuit 16 after signal processing and algorithm compensation; The supplementarys such as liquid crystal display circuit 15 shows date, temperature value and Business Name; The concentration value and the temperature that show in real time will be stored in data storage circuitry 17, can be connected with computing machine by the RS232 serial ports after staff's gug and will detect data derivation analysis; If current surveyed concentration surpasses the concentration alarm limit of setting in advance, instrument will provide the alerting signal of buzzer and two kinds of forms of LED flicker; The staff can carry out school zero by the data mutual transmission sensor 3 of downloading in EEPROM.
As shown in Figure 2,3, the utility model sensor used is the detector based on non-dispersion infrared line (NDIR) principle, it adopts novel non-focusing optical design and intellectual technology, has the characteristics of the undersized 4 series encapsulation of high-performance and symbol industry standard concurrently.This detector comprises an integrated thermistor and electricallyerasable ROM (EEROM) (EEPROM), containing Default Value, standard and calibration value, so that in very wide temperature range (20
0C is to+50
0C) keep high performance level in.The osram lamp that infrared light supply used is the low drift of infrared spectrum, optical cell is gold-plated surface, gas is diffused into sensor internal by the hole at stainless (steel) wire sintered sheets and stainless steel sleeve steel pipe socket top, infrared detection is by being used a binary channels temperature compensation pyroelectric detector to realize, the clear aperature of two passages is all determined by the optical band pass filter plate.The logical wave band of band of measuring i.e. " GAS " passage use of passage optical filter is the infrared absorption wave band (this detector is selected the narrow band pass filter that centre wavelength is 3.39 μ m places) of tested gas, by the decay of comparing light in " GAS " passage, can calculate gas concentration.Reference channel its filtering centre wavelength of optical filter that " REF " passage is used is positioned at atmosphere and object gas can not cause to it infrared band (this detector is selected the narrow band pass filter that centre wavelength is 3.9 μ m places) of optical attenuation." REF " passage can increase the stability of gas sensor, contributes to reduce long term drift and potential error as far as possible.Pyroelectric detector can be measured the luminous flux through each gas infrared absorption wave band, and obtains thus the change amount of thermal infrared flux, just because of this reason, this sensor light is used pulse signal, measures and adopts low-frequency ac to measure.The response height of pyroelectric detector depends on environment temperature, so placed the electricity of a negative temperature coefficient in infrared eye inside, leads, and it makes accurately to compensate this temperature effect becomes possibility.Sensor internal comprises an integrated storage chip, has the calibration factor for Sensor Temperature Compensation in this chip, has overcome the inherent defect of sensors with auxiliary electrode were.Thermistor is arranged in sensor outer housing, signal is compensated, and guaranteed whole operating temperature range (20
0C is to+50
0C) the gasmetry precision in.
MK60DN512ZVLL10 model minimum system in 32 Kinetis K60 Series of MCU of microprocessor employing Freescale Semiconductor, Kinetis is based on low-power consumption, the mixed signal microcontroller that ARM CortexTM-M4 has superpower extendability.The K60 Series of MCU is based on 90 nano thin-film storer (TFS) flash memory technologies of Freescale innovation, has unique Flex storer (configurable embedded EEPROM).Kinetis microcontroller series has merged up-to-date low-power consumption innovates technologies, and has high-performance, high-precision mixed signal ability, broad interconnectivity, man-machine interface and secure peripheral.And inner integrated 16 high precision analogues conversion of K60, met the utility model measurement passage and the signals such as reference channel signal value and thermistor after filtering and amplification carried out to high resolving power and high-speed sampling.Display module adopts charactron and 19264 liquid crystal displays are two shows, charactron shows the real-time concentration value, the supplementarys such as 19264 liquid crystal displays show date, temperature value and Business Name.The PORT COM module is comprised of max232 level transferring chip and standard RS232 serial ports, is used for realizing conversion and the communication between microcontroller Transistor-Transistor Logic level and RS232 level, and the RS232 serial ports is connected with computing machine and will detects data derivation analysis.
As shown in Figure 4, use novel GAS and filtering and the amplifying circuit of REF passage output signal before carrying out the ADC sampling for this.Because the output of GAS and REF passage upper sensor is analog voltage, usually be less than 30mV, consistent with the modulation of source frequency, and be superimposed upon on DC voltage, the amplitude of modulating by measurement carrys out the concentration of computation and measurement gas, so signal needed filtering and amplification before ADC is sampled.For the stability of assurance gasmetry and the long-time stability of circuit gain, the resistance used in circuit and electric capacity should have the Low Drift Temperature characteristic.As scheme selected electric capacity and resistance not only can be in the high precision of the whole length of life holding circuit gain of equipment, reduce the drift in the gasmetry process as far as possible, can also reduce to greatest extent the temperature dependency of circuit gain, guarantee the accuracy of the temperature coefficient of storage in EEPROM.
Above each module has formed whole hardware configuration of the present utility model jointly, and the high sensitivity of the utility model gas detecting instrument, except outstanding design is arranged on hardware, adopts the BP neural network of genetic optimization in the gas concentration calibration software is processed.Because exist during for the output characteristic curve of traditional least square fitting infrared sensor, error is large, calculation of complex, during the output characteristic curve of traditional BP neural network matching infrared sensor, exist network convergence speed slow, easily be absorbed in the problem of local minimum, so the utility model adopts the improved BP neural network based on genetic optimization, the method degree of fitting is higher, has effectively improved accuracy of detection and the response speed of infrared sensor.
According to the above description, can realize scheme of the present utility model in conjunction with art technology.
Claims (3)
1. the high-sensitivity portable gas detecting instrument based on the NDIR principle, it is characterized in that: include sensor, main circuit, the infrared light supply that described sensor comprises optical cell and is positioned at optical cell inside, pyroelectric detector and be the thermistor of pyroelectric detector temperature compensation, wherein in pyroelectric detector, be integrated with EEPROM, pyroelectric detector includes two detection channels respectively as measuring passage, reference channel, measure passage and be provided with the narrow band pass filter that centre wavelength is 3.39 μ m places, reference channel is provided with the narrow band pass filter that centre wavelength is 3.9 μ m places, described main circuit includes power circuit, microprocessor system, the signal input part of microprocessor system is connected with the infrared light supply drive system, measure channel filtering and amplifying circuit, reference channel filtering and amplifying circuit, thermosensitive resistor and circuit, data download circuit in EEPROM, the signal output part of microprocessor system is connected with the crystal timing circuit, sound light alarming circuit, the RS232 interface circuit, liquid crystal display circuit, digital pipe display circuit, data storage circuitry, measure channel filtering and amplifying circuit, the signal input part of reference channel filtering and amplifying circuit is connected with sensor, power circuit is each circuit supply.
2. a kind of high-sensitivity portable gas detecting instrument based on the NDIR principle according to claim 1, is characterized in that: the osram lamp of the low drift of described infrared light supply employing infrared spectrum.
3. a kind of high-sensitivity portable gas detecting instrument based on the NDIR principle according to claim 1, it is characterized in that: described optical cell is gold-plated surface, optical cell is spliced by the stainless (steel) wire sintered sheets, the top cover of optical cell has stainless steel sleeve or steel pipe socket, hole is arranged at stainless steel sleeve or steel pipe socket top, and gas is diffused into sensor internal by the hole at stainless (steel) wire sintered sheets and stainless steel sleeve or steel pipe socket top.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730116A (en) * | 2015-02-17 | 2015-06-24 | 杭州麦德乐传感科技有限公司 | Compound gas sensor |
| WO2015106607A1 (en) * | 2014-01-17 | 2015-07-23 | 无锡华润上华半导体有限公司 | Gas concentration meter, micro-flow sensor, temperature-sensitive resistor structure and manufacturing method therefor |
| CN105067554A (en) * | 2015-09-10 | 2015-11-18 | 上海申渭电子科技有限公司 | Infrared SF6 sensor device relevant to NDIR (Non-Dispersive Infrared Analyzer) and method |
| CN107192685A (en) * | 2016-03-15 | 2017-09-22 | 苏州诺联芯电子科技有限公司 | The measuring method of infrared gas sensor and infrared gas sensor |
| CN108444935A (en) * | 2018-03-21 | 2018-08-24 | 南京信息工程大学 | A kind of temperature-compensation method and compensation device of non-dispersive infrared gas sensor |
| CN109406448A (en) * | 2018-10-25 | 2019-03-01 | 四川长虹电器股份有限公司 | Infrared spectrometer |
| CN111814401A (en) * | 2020-07-08 | 2020-10-23 | 重庆大学 | LED life prediction method of BP neural network based on genetic algorithm |
-
2013
- 2013-05-20 CN CN2013202773378U patent/CN203324179U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015106607A1 (en) * | 2014-01-17 | 2015-07-23 | 无锡华润上华半导体有限公司 | Gas concentration meter, micro-flow sensor, temperature-sensitive resistor structure and manufacturing method therefor |
| CN104730116A (en) * | 2015-02-17 | 2015-06-24 | 杭州麦德乐传感科技有限公司 | Compound gas sensor |
| CN105067554A (en) * | 2015-09-10 | 2015-11-18 | 上海申渭电子科技有限公司 | Infrared SF6 sensor device relevant to NDIR (Non-Dispersive Infrared Analyzer) and method |
| CN107192685A (en) * | 2016-03-15 | 2017-09-22 | 苏州诺联芯电子科技有限公司 | The measuring method of infrared gas sensor and infrared gas sensor |
| CN108444935A (en) * | 2018-03-21 | 2018-08-24 | 南京信息工程大学 | A kind of temperature-compensation method and compensation device of non-dispersive infrared gas sensor |
| CN108444935B (en) * | 2018-03-21 | 2023-10-10 | 南京信息工程大学 | Temperature compensation method and compensation device for non-spectroscopic infrared gas sensor |
| CN109406448A (en) * | 2018-10-25 | 2019-03-01 | 四川长虹电器股份有限公司 | Infrared spectrometer |
| CN111814401A (en) * | 2020-07-08 | 2020-10-23 | 重庆大学 | LED life prediction method of BP neural network based on genetic algorithm |
| CN111814401B (en) * | 2020-07-08 | 2023-10-27 | 重庆大学 | LED life prediction method of BP neural network based on genetic algorithm |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Chen Xiaoning Inventor after: Wu Fei Inventor after: Yu Guizhou Inventor after: He Hongyan Inventor after: Zhang Tan Inventor after: Lu Zhangjun Inventor after: Ou Changjiang Inventor after: Liu Yang Inventor after: Feng Lilei Inventor before: Yu Guizhou Inventor before: Chen Xiaoyu Inventor before: Wu Fei Inventor before: Lu Zhangjun Inventor before: Ou Changjiang Inventor before: Liu Yang Inventor before: Feng Lilei |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: YU GUIZHOU CHEN XIAOYU WU FEI LU ZHANGJUN OU CHANGJIANG LIU YANG FENG LILEI TO: CHEN XIAONING WU FEI YU GUIZHOU HE HONGYAN ZHANG TAN LU ZHANGJUN OU CHANGJIANG LIU YANG FENG LILEI |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131204 Termination date: 20140520 |