CN102269699A - System and method for detecting concentration of hydrogen sulfide gas in poultry house - Google Patents

System and method for detecting concentration of hydrogen sulfide gas in poultry house Download PDF

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CN102269699A
CN102269699A CN2011102094349A CN201110209434A CN102269699A CN 102269699 A CN102269699 A CN 102269699A CN 2011102094349 A CN2011102094349 A CN 2011102094349A CN 201110209434 A CN201110209434 A CN 201110209434A CN 102269699 A CN102269699 A CN 102269699A
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laser
hydrogen sulfide
gas
sulfide gas
concentration
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CN102269699B (en
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董大明
郑文刚
赵贤德
张石锐
张馨
邱权
郭瑞
单飞飞
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Beijing Research Center of Intelligent Equipment for Agriculture
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Beijing Research Center of Intelligent Equipment for Agriculture
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Abstract

The invention discloses a system and a method for detecting the concentration of hydrogen sulfide gas in a poultry house, and relates to the technical field of harmful gas detection. The system comprises a laser, an optical transceiver, a reflector, a photoelectric detector and a signal acquisition processor and display, wherein the laser is used for emitting laser with set wavelength; the optical transceiver is connected with the laser, transmits emitted light to a reflector and light reflected by the reflector to the photoelectric detector; the reflector reflects the laser emitted by the optical transceiver back to the optical transceiver; the photoelectric detector is connected with the optical transceiver, performs photoelectric conversion on the reflected light and transmits an electric signal obtained through conversion to the signal acquisition processor and display; and the signal acquisition processor and display is connected with the photoelectric detector, inverts the concentration of the hydrogen sulfide gas by Lambert-Beer Law according to the electric signal, and displays the acquired hydrogen sulfide concentration information. By the system and the method, the H2S gas concentration in a certain range can be acquired in real time, the service life is long, and the detection accuracy is high.

Description

Pouity dwelling place sulfureted hydrogen gas concentration detection system and method
Technical field
The present invention relates to harmful gas detection technique field, relate in particular to a kind of pouity dwelling place sulfureted hydrogen gas concentration detection system and method.
Background technology
Sulfurous organic compound in the poultry farming environment (ight soil, pad grass, feed etc.) can produce H in decomposable process 2S gas.H 2S gas has toxicity, and gives out penetrating odor.The H that in pouity dwelling place, has low concentration 2During S gas, can produce bird and keeper's sense of smell stimulates, and causes the sense of discomfort and the disease of respiratory tract; The H that in pouity dwelling place, has high concentration 2During S gas, can cause bird and keeper to poison, in addition dead; H in pouity dwelling place 2When S gas outwards discharges, can cause the deterioration of ambient air.H 2Though the toxicity of S gas is stronger, the H in the pouity dwelling place 2The S gas concentration is generally lower, has brought certain difficulty for its online detection.
Existing H in the Chang Yong pouity dwelling place 2S gas online test method has two kinds.A kind of is Ultraluminescence analytic approach (Temporal and spatial distributions of aerial contaminants in an enclosed pig buildings in winter, Environmental Research, 44 volumes, the 6th phase, 11-19 page or leaf): with H 2S gas is converted into SO 400 ℃ the time by converter 2, analyze SO by laser-induced fluorescence (LIF) 2Concentration, thereby obtain H 2The concentration of S.Another kind method is electrochemical process (Micro-machined nano-crystalline silver doped SnO 2H 2S sensor, Sensors anf Actuators B:Chemical, 114 volumes, the 1st phase, 32-39 page or leaf), even the metal oxide electrode chemically reactive of gas to be measured and preparation, thus H analyzed 2The concentration of S.
The Ultraluminescence analytic approach can be to H in the pouity dwelling place 2The S gas concentration is accurately measured, but following defective is arranged:
(1) need carry out high-temperature chemical reaction, during expend time in and energy;
(2) though can realize on-line monitoring, reaction velocity is slow, and Measuring Time is long;
(3) Zhuan Zhi volume is general bigger;
(4) only can obtain the H of measuring position 2The S gas concentration can not be to the H in certain zone 2The S gas concentration is monitored.
Electrochemical process can realize H in the pouity dwelling place 2The low-cost online detection of S gas concentration, but following defective is arranged:
(1) H in the pouity dwelling place 2The S gas concentration is lower, and the electrochemical electrode reaction is insensitive, and accuracy of detection is not high;
(2) there is baseline drift in electrochemical electrode, needs often it to be calibrated;
(3) the electrochemical electrode physical life is shorter, needs in time to change;
(4) need contact measurement, only can obtain the H of measuring position 2The S gas concentration can not be to the H in certain zone 2The S gas concentration is monitored.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is: a kind of H that can obtain in real time in the certain limit is provided 2The contactless pouity dwelling place H that S gas concentration, long service life and accuracy of detection are high 2S gas concentration detection system and method.
(2) technical scheme
For addressing the above problem, the invention provides sulfureted hydrogen gas concentration detection system in a kind of pouity dwelling place, this system comprises: laser instrument, be used to launch the laser of setting wavelength, described setting wavelength is the characteristic wavelength of hydrogen sulfide gas; Optical transceiver is connected with described laser instrument, is used for emission light is sent to reverberator, and the reflected light of reverberator reflected back is sent to photoelectric detector; Reverberator is used for described optical transceiver is returned in the laser-bounce of being sent by described optical transceiver; Photoelectric detector links to each other with described optical transceiver, is used for described reflected light is carried out opto-electronic conversion, and the electric signal that is converted to is sent to signal acquisition process and display; Signal acquisition process and display link to each other with described photoelectric detector, are used for according to described electric signal, adopt the concentration of langbobier law inverting hydrogen sulfide gas to be measured, and show the concentration information of the hydrogen sulfide gas to be measured that obtains.
Preferably, this system also comprises: the laser instrument control module, link to each other with described laser instrument, and be used to drive described laser instrument emission laser signal.
Preferably, this system also comprises: temperature control module, described laser control module links to each other, and is used for the temperature of described laser instrument is controlled in the constant scope, and produces modulation signal, and the wavelength of laser instrument emitted laser is modulated.
Preferably, described laser instrument is the distributed feed-back Distributed Feedback Laser.
Preferably, described optical transceiver comprises: optical collimator, be used for the parasitic light of the described laser instrument emitted laser of filtering, and the reflected light that converges the reverberator reflected back; Spectrophotometric unit, the reflected light that is used for described optical collimator is converged carries out light-splitting processing.
Preferably, described optical transceiver is connected by optical fiber with described laser instrument.
Preferably, described reverberator is a plane mirror, or the angle mirror structure for being made of mutually perpendicular two catoptrons.
The present invention also provides sulfureted hydrogen gas concentration detection method in a kind of pouity dwelling place, and the method comprising the steps of:
S1. the laser of wavelength is set in the drive laser emission, and described setting wavelength is the characteristic wavelength of hydrogen sulfide gas;
S2. optical transceiver is sent to reverberator with the light of laser instrument emission, and the reflected light of transmitter reflected back is sent to photoelectric detector;
S3. photoelectric detector carries out opto-electronic conversion to described reflected light, and the electric signal that is converted to is sent to signal acquisition process and display;
S4. signal acquisition process and display adopt the concentration of langbobier law inverting hydrogen sulfide gas to be measured according to described electric signal, and show the concentration of the hydrogen sulfide gas to be measured that obtains.
Preferably, step S4 comprises:
S4.1 signal acquisition process and display amplify and Filtering Processing described electric signal, and carry out analog to digital conversion, obtain the second harmonic signal of digitized hydrogen sulfide gas to be measured;
Many repeating step S1-S4.1 of S4.2 obtain a plurality of second harmonic signals of hydrogen sulfide gas to be measured;
The second harmonic signal that S4.3 is used for the hydrogen sulfide gas of concentration known carries out least-squares algorithm linear fitting to a plurality of second harmonic signals of hydrogen sulfide gas to be measured, obtains the optimal value of the second harmonic signal of hydrogen sulfide gas to be measured;
S4.4 is according to langbobier law, multiply by the content that described optimal value obtains described hydrogen sulfide gas to be measured with the concentration of the hydrogen sulfide gas of described concentration known.
(3) beneficial effect
System and method of the present invention is measured the mode of its spectral absorption intensity then by the open light path emission of Distributed Feedback Laser narrow-linewidth laser, has realized on-line quick detection H under non-contacting situation 2The concentration of S gas.This system is simply portable, and controlled light path scope is big, is applicable to the H of all kinds of pouity dwelling places of large, medium and small type 2The S gas detection, highly sensitive, the hommization operation is convenient in liquid crystal display.With respect to original technology, greatly degree has been saved human and material resources and time.
Description of drawings
Fig. 1 is the pouity dwelling place sulfureted hydrogen gas concentration detection system structured flowchart according to one embodiment of the present invention;
Fig. 2 is the pouity dwelling place sulfureted hydrogen gas concentration detection method process flow diagram according to one embodiment of the present invention.
Embodiment
Pouity dwelling place sulfuretted hydrogen (the H that the present invention proposes 2S) gas concentration detection system and method reach embodiment in conjunction with the accompanying drawings and are described in detail as follows.
The pouity dwelling place H of present embodiment 2The S gas concentration detection system adopts the active probe mode, and producing wavelength with laser instrument is H 2The laser of the characteristic wavelength of S gas.After the Laser emission, after tens meters transmission, at reflector surface full emission taking place, after beam split, is obtained by photoelectric detector in livestock and poultry.The laser spectrum signal that photoelectric detector is obtained carries out quantitative analysis, can obtain the H to be measured in the light path 2S gas total concentration.
As shown in Figure 1, according to the pouity dwelling place sulfuretted hydrogen (H of one embodiment of the present invention 2S) gas concentration detection system comprises:
Laser instrument 4, being used for emission wavelength is H 2The laser of the characteristic wavelength of S gas.Preferably, the Laser Transmission distance is between 5m-200m.Laser instrument 4 also is used for emission wavelength and is the laser with reference to wavelength, and be used for ground unrest is eliminated with reference to wavelength: there is absorption in characteristic wavelength at hydrogen sulfide gas, and does not have absorption with reference to wavelength, and the two is subtracted each other, and has both obtained the noise of system itself.
Optical transceiver 5 is connected with laser instrument 4, is used for emission light is sent to reverberator 6, and the reflected light of reverberator 6 reflected backs is sent to photoelectric detector 2.
Reverberator 6 is installed in the fixed position of pouity dwelling place, and and laser instrument 4 between have no occluder, be used for the laser-bounce light echo transceiver 5 that will send by optical transceiver 5, can aluminize in reverberator 6 surfaces.
Photoelectric detector 2 links to each other with optical transceiver 5, is used for reflected light is carried out opto-electronic conversion, and the electric signal that is converted to is sent to signal acquisition process and display 1.The wavelength band of photoelectric detector 2 responses contains two wavelength that laser instrument 4 is launched.
Signal acquisition process and display 1, link to each other with photoelectric detector 2, be used for to the ultra-weak electronic signal that photoelectric detector 2 sends amplify, processing such as filtering, gather by digital to analog converter again, thereby obtain digitized laser spectrum data, according to these laser spectrum data (second harmonic signal), adopt langbobier law (Lambert-Beer) inverting H to be measured 2The concentration of S gas, and show the H to be measured that obtains 2The concentration information of S.
By the Lambert-Beer law as can be known, the amplitude of the second harmonic signal that measures is directly proportional with gas concentration, therefore can directly come inverting H to be measured according to the second harmonic signal amplitude after handling 2The concentration of S gas.But before inverting, must find the H of normal concentration (general concentration ratio is higher) 2S gas is done reference, and the second harmonic signal that records according to calibrating gas is to the H to be measured that records 2The second harmonic signal of S gas carries out least-squares algorithm linear fitting, obtains H to be measured 2The optimal value of the second harmonic of S gas, the concentration of calibrating gas is multiplied by this optimal value and just obtains H to be measured 2The concentration of S gas.
This system also comprises: laser instrument control module 3, link to each other with laser instrument 4, and be used for drive laser 4, and make laser instrument 4 be operated in linear modulation zone on the P-I family curve threshold current.By analysis, need merge sinusoidal wave and DC quantity of the triangular wave of a low frequency and a higher-frequency, finally form a current signal and drive Distributed Feedback Laser.In addition, the protective effect that this laser instrument control module 3 also has laser instrument 4 mainly comprises electric protection, operating voltage restriction and input voltage control.
Optical transceiver 5 preferably is connected with laser instrument 4 by optical fiber.This optical transceiver 5 comprises:
Optical collimator is used for the parasitic light of filtering laser instrument 4 emitted laser, and the reflected light that is used to converge reverberator 6 reflected backs;
Spectrophotometric unit, the reflected light that is used for optical collimator is converged carries out light-splitting processing, preferably, is made up of slit and diffraction grating, and the light after the separation incides photoelectric detector 2.
As shown in Figure 2, the present invention also provides a kind of pouity dwelling place sulfureted hydrogen gas concentration detection method, and the method comprising the steps of:
S1. the laser of wavelength is set in the emission of laser instrument control module drive laser, and this setting wavelength is H 2The characteristic wavelength of S gas;
S2. optical transceiver is sent to reverberator with the light of laser instrument emission, and the reflected light of transmitter reflected back is sent to photoelectric detector;
S3. photoelectric detector carries out opto-electronic conversion to described reflected light, and the electric signal that is converted to is sent to signal acquisition process and display;
S4. signal acquisition process and display adopt the langbobier law inverting to obtain H to be measured according to described electric signal 2The concentration of S gas, and show the H to be measured that obtains 2The S gas concentration.
Wherein, step S4 comprises:
S4.1 signal acquisition process and display amplify and Filtering Processing electric signal, and carry out analog to digital conversion, obtain digitized H to be measured 2The second harmonic signal of S gas;
Many repeating step S1-S4.1 of S4.2 obtain H to be measured 2A plurality of second harmonic signals of S gas;
S4.3 is used for the H of concentration known 2The second harmonic signal of S gas under the testing environment of native system is to H to be measured 2A plurality of second harmonic signals of S gas carry out least-squares algorithm linear fitting, obtain H to be measured 2The optimal value of the second harmonic signal of S gas;
S4.4 is according to langbobier law, with the H of concentration known 2The concentration of S gas multiply by optimal value and obtains H to be measured 2The content of S gas.
Embodiment 1
Laser instrument in the present embodiment is the adjustable diode laser of writing, and its emitted laser wavelength can be subjected to the influence of temperature and output current simultaneously.The mode that present embodiment takes temperature to weigh, regulate electric current is exported two band light beam.The system of present embodiment also comprises:
Temperature control module links to each other with laser control module, is used for the temperature of laser instrument is controlled in the constant scope, and produces modulation signal, and the Wavelength of Laser that laser instrument sends is modulated.
Embodiment 2
The laser instrument of present embodiment is distributed feed-back (Distributed Feed Back, a DFB) laser instrument.The effect of this Distributed Feedback Laser is to produce with 1578nm (H 2The absorption spectra peak of S gas) be the laser of narrowband at center.Because what present embodiment adopted is the Distributed Feedback Laser that has refrigeration control, so need not to add temperature control module.
What reverberator was selected is plane mirror, the incident light strictness can be reflected back abreast.
The effect of photoelectric detector is that light signal is converted to electric signal, so that follow-up information processing.Photoelectric detector receives the photocurrent I that produces after the optical radiation PWith the pass of illumination be:
I P＝ηEAeλ/h c
In the formula, η is the quantum efficiency of photoelectric absorption process; E is a light radiant flux density; A is the receiving area of photodiode; λ is an optical wavelength; Hc is single photon energy.
Embodiment 3
The system architecture of present embodiment is similar to Example 2, is made up of signal acquisition process and display, photoelectric detector, laser instrument control module, Distributed Feedback Laser, optical transceiver, several parts of reverberator.
Compare to embodiment 2, the light path of present embodiment is grown (30m), and (light path refers to the length that light passes, and this value is to be determined by the distance of measuring.Light path is long more, the feature laser wavelength is absorbed many more, therefore, if distance is long, the strong laser wavelength that absorbs can be saturated, and should adopt more weak feature laser this moment, as wavelength is 1570nm), the stronger spectral absorption summit state that when gas concentration is strong, reaches capacity, so present embodiment adopts the Distributed Feedback Laser of 1570nm, evades H 2S gas is in the strong absorption of 1578nm.
Simultaneously, because the distance between outgoing and the reception is far away, the reverberator of present embodiment adopts the angle mirror structure, promptly is made of mutually perpendicular two reflector body, and no matter light is with which kind of angle incident, all is parallel to input path in theory and returns.
The retrieving concentration method of present embodiment is all identical with preceding two embodiment, promptly carries out H on the second harmonic basis 2The metering of S gas concentration.
Above embodiment only is used to illustrate the present invention, and is not limitation of the present invention.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is carried out various combinations, revises or is equal to replacement, the spirit and scope that do not break away from technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (9)

1. pouity dwelling place sulfureted hydrogen gas concentration detection system is characterized in that this system comprises:
Laser instrument is used to launch the laser of setting wavelength, and described setting wavelength is the characteristic wavelength of hydrogen sulfide gas;
Optical transceiver is connected with described laser instrument, is used for emission light is sent to reverberator, and the reflected light of reverberator reflected back is sent to photoelectric detector;
Reverberator is used for described optical transceiver is returned in the laser-bounce of being sent by described optical transceiver;
Photoelectric detector links to each other with described optical transceiver, is used for described reflected light is carried out opto-electronic conversion, and the electric signal that is converted to is sent to signal acquisition process and display;
Signal acquisition process and display link to each other with described photoelectric detector, are used for according to described electric signal, adopt the concentration of langbobier law inverting hydrogen sulfide gas to be measured, and show the concentration information of the hydrogen sulfide gas to be measured that obtains.
2. pouity dwelling place sulfureted hydrogen gas concentration detection system as claimed in claim 1 is characterized in that this system also comprises:
The laser instrument control module links to each other with described laser instrument, is used to drive described laser instrument emission laser signal.
3. pouity dwelling place sulfureted hydrogen gas concentration detection system as claimed in claim 2 is characterized in that this system also comprises:
Temperature control module, described laser control module links to each other, and is used for the temperature of described laser instrument is controlled in the constant scope, and produces modulation signal, and the wavelength of laser instrument emitted laser is modulated.
4. pouity dwelling place sulfureted hydrogen gas concentration detection system as claimed in claim 1 is characterized in that described laser instrument is the distributed feed-back Distributed Feedback Laser.
5. pouity dwelling place sulfureted hydrogen gas concentration detection system as claimed in claim 2 is characterized in that described optical transceiver comprises:
Optical collimator is used for the parasitic light of the described laser instrument emitted laser of filtering, and the reflected light that converges the reverberator reflected back;
Spectrophotometric unit, the reflected light that is used for described optical collimator is converged carries out light-splitting processing.
6. pouity dwelling place sulfureted hydrogen gas concentration detection system as claimed in claim 1 is characterized in that described optical transceiver is connected by optical fiber with described laser instrument.
7. pouity dwelling place sulfureted hydrogen gas concentration detection system as claimed in claim 1 is characterized in that described reverberator is a plane mirror, or the angle mirror structure for being made of mutually perpendicular two catoptrons.
8. pouity dwelling place sulfureted hydrogen gas concentration detection method is characterized in that the method comprising the steps of:
S1. the laser of wavelength is set in the drive laser emission, and described setting wavelength is the characteristic wavelength of hydrogen sulfide gas;
S2. optical transceiver is sent to reverberator with the light of laser instrument emission, and the reflected light of transmitter reflected back is sent to photoelectric detector;
S3. photoelectric detector carries out opto-electronic conversion to described reflected light, and the electric signal that is converted to is sent to signal acquisition process and display;
S4. signal acquisition process and display adopt the concentration of langbobier law inverting hydrogen sulfide gas to be measured according to described electric signal, and show the concentration of the hydrogen sulfide gas to be measured that obtains.
9. pouity dwelling place sulfureted hydrogen gas concentration detection method as claimed in claim 8 is characterized in that step S4 comprises:
S4.1 signal acquisition process and display amplify and Filtering Processing described electric signal, and carry out analog to digital conversion, obtain the second harmonic signal of digitized hydrogen sulfide gas to be measured;
Many repeating step S1-S4.1 of S4.2 obtain a plurality of second harmonic signals of hydrogen sulfide gas to be measured;
The second harmonic signal that S4.3 is used for the hydrogen sulfide gas of concentration known carries out least-squares algorithm linear fitting to a plurality of second harmonic signals of hydrogen sulfide gas to be measured, obtains the optimal value of the second harmonic signal of hydrogen sulfide gas to be measured;
S4.4 is according to langbobier law, multiply by the content that described optimal value obtains described hydrogen sulfide gas to be measured with the concentration of the hydrogen sulfide gas of described concentration known.
CN 201110209434 2011-07-25 2011-07-25 Method for detecting concentration of hydrogen sulfide gas in poultry house Active CN102269699B (en)

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CN103528992A (en) * 2013-10-25 2014-01-22 北京农业智能装备技术研究中心 System and method for measuring methane distribution in livestock house
CN110470630A (en) * 2018-05-11 2019-11-19 西安电子科技大学 A kind of distribution type fiber-optic gas sensor based on difference modes
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CN112924415A (en) * 2021-01-26 2021-06-08 北京无线电计量测试研究所 Data processing method and system for laser methane telemetering equipment
CN113406018A (en) * 2021-06-17 2021-09-17 大连海事大学 Detector and detection method for sulfur content of marine fuel oil
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Publication number Priority date Publication date Assignee Title
CN103528992A (en) * 2013-10-25 2014-01-22 北京农业智能装备技术研究中心 System and method for measuring methane distribution in livestock house
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CN110470630A (en) * 2018-05-11 2019-11-19 西安电子科技大学 A kind of distribution type fiber-optic gas sensor based on difference modes
CN110554002A (en) * 2019-09-30 2019-12-10 大连艾科科技开发有限公司 Hydrogen sulfide concentration detection module, hydrogen sulfide concentration telemeter and application
CN112924415A (en) * 2021-01-26 2021-06-08 北京无线电计量测试研究所 Data processing method and system for laser methane telemetering equipment
CN112924415B (en) * 2021-01-26 2023-01-06 北京无线电计量测试研究所 Data processing method and system for laser methane telemetering equipment
CN113406018A (en) * 2021-06-17 2021-09-17 大连海事大学 Detector and detection method for sulfur content of marine fuel oil
CN113406018B (en) * 2021-06-17 2024-02-09 大连海事大学 Marine fuel oil sulfur content detector and detection method

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