CN102269699B - Method for detecting concentration of hydrogen sulfide gas in poultry house - Google Patents

Method for detecting concentration of hydrogen sulfide gas in poultry house Download PDF

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CN102269699B
CN102269699B CN 201110209434 CN201110209434A CN102269699B CN 102269699 B CN102269699 B CN 102269699B CN 201110209434 CN201110209434 CN 201110209434 CN 201110209434 A CN201110209434 A CN 201110209434A CN 102269699 B CN102269699 B CN 102269699B
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laser
hydrogen sulfide
concentration
sulfide gas
measured
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CN102269699A (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

The concentration of hydrogen sulfide gas in poultry house detection method
Technical field
The present invention relates to harmful gas detection technique field, relate in particular to a kind of concentration of hydrogen sulfide gas in poultry house 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.There is the H of low concentration in pouity dwelling place 2during S gas, can produce and stimulate bird and keeper's sense of smell, cause sense of discomfort and the disease of respiratory tract; There is the H of high concentration in pouity dwelling place 2during S gas, can cause bird and keeper poisoning, even dead; H in pouity dwelling place 2when S gas outwards discharges, can cause the deterioration of ambient air.H 2although the toxicity of S gas is stronger, the H in pouity dwelling place 2the S gas concentration is generally lower, has brought certain difficulty to its online detection.
Existing H in pouity dwelling place commonly used 2s gas online test method has two kinds.A kind of is ultraviolet fluorescence analysis method (Temporal and spatial distributions of aerial contaminants in an enclosed pig buildings in winter, Environmental Research, 44 volumes, the 6th phase, 11-19 page): by H 2s gas is converted into SO 400 ℃ the time by converter 2, by laser-induced fluorescence (LIF), analyze SO 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), even the metal oxide electrode chemically reactive of gas to be measured and preparation, thus H analyzed 2the concentration of S.
The ultraviolet fluorescence analysis method can be to H in pouity dwelling place 2the S gas concentration is carried out Accurate Measurement, but following defect is arranged:
(1) need to 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) volume of device is generally larger;
(4) only can obtain the H of measuring position 2the S gas concentration, can not be to the H in certain area 2the S gas concentration is monitored.
Electrochemical process can realize H in pouity dwelling place 2the low cost of S gas concentration detects online, but following defect is arranged:
(1) H in 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, need change in time;
(4) need contact measurement, only can obtain the H of measuring position 2the S gas concentration, can not be to the H in certain area 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: but the H in a kind of Real-time Obtaining 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, for launching the laser of setting wavelength, the characteristic wavelength that described setting wavelength is hydrogen sulfide gas; Optical transceiver, be connected with described laser instrument, and for utilizing emitted light is sent to reverberator, and the reflected light that reverberator is reflected back is sent to photoelectric detector; Reverberator, return described optical transceiver for the laser reflection that will be sent by described optical transceiver; Photoelectric detector, be connected with described optical transceiver, for described reflected light is carried out to opto-electronic conversion, and the electric signal be converted to is sent to signal acquisition process and display; Signal acquisition process and display, be connected with described photoelectric detector, for according to described electric signal, adopts 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 obtained.
Preferably, this system also comprises: the laser control module is connected with described laser instrument, for driving described laser instrument Emission Lasers signal.
Preferably, this system also comprises: temperature control module, and described laser control module is connected, and is controlled in constant scope for the temperature by described laser instrument, and produces modulation signal, and the wavelength of the laser that laser instrument is launched is modulated.
Preferably, described laser instrument is the distributed feed-back Distributed Feedback Laser.
Preferably, described optical transceiver comprises: optical collimator, and the parasitic light of the laser of launching for the described laser instrument of filtering, and converge the reflected light that reverberator is reflected back; Spectrophotometric unit, carry out light-splitting processing for the reflected light that described optical collimator is converged.
Preferably, described optical transceiver is connected by optical fiber with described laser instrument.
Preferably, described reverberator is plane mirror, or is by mutually perpendicular two angular mirror structures that catoptron forms.
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, the characteristic wavelength that described setting wavelength is hydrogen sulfide gas are set in the drive laser emission;
S2. optical transceiver is sent to reverberator by the light of laser instrument emission, and the reflected light that transmitter is reflected back is sent to photoelectric detector;
S3. photoelectric detector carries out opto-electronic conversion to described reflected light, and the electric signal be converted to is sent to signal acquisition process and display;
S4. signal acquisition process and display, according to described electric signal, adopt the concentration of langbobier law inverting hydrogen sulfide gas to be measured, and show the concentration of the hydrogen sulfide gas to be measured obtained.
Preferably, step S4 comprises:
S4.1 signal acquisition process and display are amplified described electric signal and filtering is processed, 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;
S4.3 carries out least-squares algorithm linear fitting for the second harmonic signal of the hydrogen sulfide gas of concentration known 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, by the concentration of the hydrogen sulfide gas of described concentration known, is multiplied by the content that described optimal value obtains described hydrogen sulfide gas to be measured.
(3) beneficial effect
System and method of the present invention, by Distributed Feedback Laser open path emission narrow-linewidth laser, is then measured the mode of its spectral absorption intensity, has realized on-line quick detection H in non-contacting situation 2the concentration of S gas.This system is simply portable, and controlled light path scope is large, is applicable to the H of all kinds of pouity dwelling places of large, medium and small type 2s gas detects, highly sensitive, and 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.
The accompanying drawing explanation
Fig. 1 is the concentration of hydrogen sulfide gas in poultry house detection system structured flowchart according to one embodiment of the present invention;
Fig. 2 is the concentration of hydrogen sulfide gas in poultry house 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 by reference to the accompanying drawings embodiment and be 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 Laser emission, in livestock and poultry after the transmission of tens meters, at reflector surface, full emission occurs, after light splitting, by photoelectric detector, obtained.The laser spectrum signal that photoelectric detector is obtained carries out quantitative analysis, can obtain the H to be measured in 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 is H for emission wavelength 2the laser of the characteristic wavelength of S gas.Preferably, the Laser Transmission distance is between 5m-200m.Laser instrument 4 is also the laser with reference to wavelength for emission wavelength, and with reference to wavelength, be used for ground unrest is eliminated: characteristic wavelength exists and absorbs 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, be connected with laser instrument 4, and for utilizing emitted light being sent to reverberator 6, and the reflected light that reverberator 6 is reflected back is sent to photoelectric detector 2.
Reverberator 6, be arranged on the fixed position of pouity dwelling place, and and laser instrument 4 between have no occluder, for the laser reflection light echo transceiver 5 that will be sent by optical transceiver 5, can aluminize in reverberator 6 surfaces.
Photoelectric detector 2, be connected with optical transceiver 5, for reflected light is carried out to opto-electronic conversion, and the electric signal be 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, with photoelectric detector 2, be connected, the processing such as the ultra-weak electronic signal that is used for that photoelectric detector 2 is sent is amplified, filtering, by digital to analog converter, gathered 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 obtained 2the concentration information of S.
From the Lambert-Beer law, the amplitude of the second harmonic signal measured is directly proportional with gas concentration, therefore can directly according to the second harmonic signal amplitude after processing, carry out inverting H to be measured 2the concentration of S gas.But, before inverting, must find the H of normal concentration (general concentration ratio is higher) 2s gas makes reference, and the second harmonic signal recorded according to calibrating gas, to the H to be measured recorded 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 control module 3, with laser instrument 4, be connected, and for drive laser 4, and make laser instrument 4 be operated in the linear modulation zone on P-I family curve threshold current.By analysis, need to be merged a 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 control module 3 also has laser instrument 4, mainly comprise 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, the parasitic light of the laser of launching for filtering laser instrument 4, and the reflected light be reflected back for converging reverberator 6;
Spectrophotometric unit, carry out light-splitting processing for the reflected light that optical collimator is converged, and preferably, slit and diffraction grating, consists of, and the light after separation incides photoelectric detector 2.
As shown in Figure 2, the present invention also provides a kind of concentration of hydrogen sulfide gas in poultry house detection method, and the method comprising the steps of:
S1. the laser of wavelength is set in the emission of laser control module drive laser instrument, and this setting wavelength is H 2the characteristic wavelength of S gas;
S2. optical transceiver is sent to reverberator by the light of laser instrument emission, and the reflected light that transmitter is reflected back is sent to photoelectric detector;
S3. photoelectric detector carries out opto-electronic conversion to described reflected light, and the electric signal be converted to is sent to signal acquisition process and display;
S4. signal acquisition process and display, according to described electric signal, adopt the langbobier law inverting to obtain H to be measured 2the concentration of S gas, and show the H to be measured obtained 2the S gas concentration.
Wherein, step S4 comprises:
S4.1 signal acquisition process and display are amplified electric signal and filtering is processed, 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 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 is multiplied 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 the optical maser wavelength of its emission can be subject to the impact of temperature and output current simultaneously.The mode that the present embodiment takes temperature to weigh, regulate electric current is exported the light beam of two wave bands.The system of the present embodiment also comprises:
Temperature control module, be connected with laser control module, is controlled in constant scope for the temperature by laser instrument, and produces modulation signal, and the wavelength of the laser that laser instrument is sent is modulated.
Embodiment 2
The laser instrument of the present embodiment is distributed feed-back (Distributed Feed Back, DFB) laser instrument.The effect of this Distributed Feedback Laser is to produce with 1578nm (H 2the absorption spectra peak of S gas) laser of narrowband centered by.Because what the present embodiment adopted is the Distributed Feedback Laser with refrigeration control, so without additional temperature control module.
What reverberator was selected is plane mirror, incident light strictly 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 produced after optical radiation pwith the pass of illumination, be:
I P＝ηEAeλ/h c
In formula, the quantum efficiency that η is the photoelectric absorption process; E is light radiant flux density; The receiving area that A is photodiode; λ is optical wavelength; Hc is single photon energy.
Embodiment 3
The system architecture of the present embodiment is similar to Example 2, signal acquisition process and display, photoelectric detector, laser control module, Distributed Feedback Laser, optical transceiver, several parts of reverberator, consists of.
Compare to embodiment 2, the light path of the 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 longer, the feature laser wavelength is absorbed more, therefore, if distance is long, the strong laser wavelength absorbed can be saturated, now should adopt weak feature laser, as wavelength is 1570nm), the stronger spectral absorption summit state that reaches capacity when gas concentration is strong, so the present embodiment adopts the Distributed Feedback Laser of 1570nm, evades H 2s gas is in the strong absorption of 1578nm.
Simultaneously, distant due to outgoing and between receiving, the reverberator of the present embodiment adopts angular mirror structure, mutually perpendicular two reflector body, consists of, and no matter light is with which kind of angle incident, all is parallel in theory input path and returns.
The retrieving concentration method of the present embodiment is all identical with the first two embodiment, on the second harmonic basis, carries out H 2the metering of S gas concentration.
Above embodiment is only for the present invention is described, and limitation of the present invention not.Although with reference to embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is carried out to various combinations, revises or is equal to replacement, do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.

Claims (2)

1. a concentration of hydrogen sulfide gas in poultry house detection method, is characterized in that, the method adopts the concentration of hydrogen sulfide gas in poultry house detection system, and this system comprises the distributed feed-back Distributed Feedback Laser, for launching the laser of 1570nm wavelength; The laser control module, with described laser instrument, be connected, for driving described laser instrument Emission Lasers signal, and make the linear modulation zone of laser works on P-I family curve threshold current, a sinusoidal wave and DC quantity of the triangular wave of a low frequency and a higher-frequency is merged, finally form a current signal and drive Distributed Feedback Laser; Temperature control module, be connected with laser control module, is controlled in constant scope for the temperature by described laser instrument, and produces modulation signal, and the wavelength of the laser that laser instrument is launched is modulated; Optical transceiver, be connected with described laser instrument, and for utilizing emitted light is sent to reverberator, and the reflected light that reverberator is reflected back is sent to photoelectric detector; Reverberator, return described optical transceiver for the laser reflection that will be sent by described optical transceiver, and reverberator is plane mirror, or be by mutually perpendicular two angular mirror structures that catoptron forms; Photoelectric detector, be connected with described optical transceiver, for described reflected light is carried out to opto-electronic conversion, and the electric signal be converted to is sent to signal acquisition process and display; Signal acquisition process and display, be connected with described photoelectric detector, for according to described electric signal, adopts 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 obtained; The method comprising the steps of:
S1. drive laser produces the laser of 1570nm by the laser of temperature control module modulate emission characteristic wavelength;
S2. optical transceiver is sent to reverberator by the light of laser instrument emission, and the reflected light that reverberator is reflected back is sent to photoelectric detector;
S3. photoelectric detector carries out opto-electronic conversion to described reflected light, and the electric signal be converted to is sent to signal acquisition process and display;
S4. signal acquisition process and display, according to described electric signal, adopt the concentration of langbobier law inverting hydrogen sulfide gas to be measured, and show the concentration of the hydrogen sulfide gas to be measured obtained.
2. concentration of hydrogen sulfide gas in poultry house detection method as claimed in claim 1, is characterized in that, step S4 comprises:
S4.1 signal acquisition process and display are amplified described electric signal and filtering is processed, 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;
S4.3 carries out least-squares algorithm linear fitting for the second harmonic signal of the hydrogen sulfide gas of concentration known 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, by the concentration of the hydrogen sulfide gas of described concentration known, is multiplied by the content that described optimal value obtains described hydrogen sulfide gas to be measured.
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CN103528992B (en) * 2013-10-25 2017-01-11 北京农业智能装备技术研究中心 System and method for measuring methane distribution in livestock house
FR3032035B1 (en) * 2015-01-27 2022-07-15 Arkema France TRANSPORTABLE DEVICE FOR ON-LINE MEASUREMENT OF THE HYDROGEN SULPHIDE CONCENTRATION OF A GAS EFFLUENT
CN110470630B (en) * 2018-05-11 2021-12-28 西安电子科技大学 Distributed optical fiber gas sensor based on differential mode
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
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
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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AT500543B1 (en) * 2002-02-11 2006-11-15 Franz Dr Winter METHOD FOR RASKING SPECTROSCOPIC CONCENTRATION, TEMPERATURE AND PRESSURE MEASUREMENT OF GASEOUS WATER
CN101782514B (en) * 2009-11-05 2011-09-28 胜利油田胜利工程设计咨询有限责任公司 Online monitoring device for concentration of hydrogen sulfide by laser
CN101915740A (en) * 2010-08-02 2010-12-15 北京大方科技有限责任公司 Gas metering monitoring device and monitoring method

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