CN109211825A - Solution gas infrared detecting device and method in a kind of water using acoustooptical effect collimated light path - Google Patents
Solution gas infrared detecting device and method in a kind of water using acoustooptical effect collimated light path Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 230000000694 effects Effects 0.000 title claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 49
- 230000005611 electricity Effects 0.000 claims abstract description 35
- 238000004891 communication Methods 0.000 claims abstract description 32
- 230000003321 amplification Effects 0.000 claims abstract description 26
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 26
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 239000007789 gas Substances 0.000 claims description 326
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000012544 monitoring process Methods 0.000 claims description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 230000002159 abnormal effect Effects 0.000 claims description 15
- 238000003860 storage Methods 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000000284 extract Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000002372 labelling Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 4
- 238000004090 dissolution Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 150000004677 hydrates Chemical class 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- DGJPPCSCQOIWCP-UHFFFAOYSA-N cadmium mercury Chemical compound [Cd].[Hg] DGJPPCSCQOIWCP-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012625 in-situ measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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Abstract
The present invention provides solution gas infrared detecting device and method in a kind of water using acoustooptical effect collimated light path, belongs to infrared gas detection technology and application field, including optics, electricity, auxiliary and mechanical part.Opticator includes light source module, acousto-optic modulator, closed gas chamber, photoelectric detection module, and linear formula light channel structure intelligently adjusts the output beam of light source module using acousto-optic modulator, to realize beam path alignment；Electric department point includes power supply, light source driving, acousto-optic driving, the acquisition of gas chamber temperature control, gas chamber pressure control, data, locking phase amplification, dsp processor mould, host computer communication module；Slave part is air pump module；Mechanical part includes cylinder-shaped sealing shell, upper platform, lower layer's platform, front panel, rear panel, 24V power inlet, communications cable outlet, gas vent, gas access；This invention simplifies the complexities of sensor optical system, improve stability of instrument and portability, are more suitable for underwater operation environment.
Description
Technical field
The invention belongs to infrared gas detection technology and applied technical fields, and in particular to a kind of to be collimated using acoustooptical effect
Solution gas infrared detecting device and method in the water of optical path.
Background technique
Gas hydrates are distributed widely in all over the world close as the 21 century new energy for being expected to substitute fossil fuels
In bottom sediment.Before finding feasible recovery method, the submarine exploration to gas hydrates and related substances is
The emphasis research topic of scientists.One of decomposition emergent gas as gas hydrates, the titanium dioxide dissolved in seawater
Carbon (CO2), methane (CH4), hydrogen sulfide (H2S) concentration and its isotope abundance become the object that people need focus measurement.
Gas detection technology field under water, currently used method have seismic reflection method and chemical sensor detection method；
Wherein the former is to carry out Underwater Imaging using propagation effect of the underwater evolution bubble to signals such as sound waves, the disadvantage is that cannot be to underwater
Dissolved gas carry out quantitative analysis, the latter needs to be sampled under water first, then carry out sample analysis by land, the disadvantage is that
Original position and the real-time of gas detection are not can guarantee.
Gas detection technology based on infrared absorption spectrum is to be made using different molecular to the absorption of specific infrared spectroscopy
With the concentration information of gas being converted into optical signal, and then be converted into electric signal and analyzed.Using tunable diode laser
Absorption spectrum (Tunable Diode Laser Absorption Spectroscopy, TDLAS) combines Wavelength modulation spectroscopy
(Wavelength Modulation Spectroscopy, WMS) (TDLAS-WMS) technology measures gas concentration, substantially former
Reason is: making laser by applying sawtooth current scanning signal using the electric current tuning and thermal tuning characteristic of laser wavelength
The a certain absorption peak of the output wavelength scanning under test gas of device, while Sine Modulated is carried out to the wavelength of laser, according to secondary
The correlation examinations of harmonic signal amplitude (relative to frequency modulating signal) and gas concentration.The technology with it is currently used
Underwater gas detection technology is compared, have high sensitivity, selectivity it is good, can real-time in-situ measurement, excellent with long-time stability etc.
Point.However, the gas-detecting device based on TDLAS-WMS technology that people report at present, structure is complicated for light path part, body
Product is huge, after integrated sensor-based system, needs biggish volumetric spaces, can not thus form portable instrument；Light path part
Mechanical alignment method is generally used, this method is extremely sensitive to vibrating, and the uncertain factors such as underwater vibration easily cause optical path to lose
Standard, the working performance so that quasi-instrument is not used to underwater environment, or in an underwater environment are deteriorated or even can not normal works
Make.Therefore it for environment such as the high pressures, humidity, vibration that adapt to underwater confined space, needs to optimize optics, electricity structure and reduces
Volume, more stringent requirements are proposed for this design to gas dissolved water sensor.
Summary of the invention
Detection technique demand and existing TDLAS-WMS infrared gas detection device for solution gas in water is in optical design
On deficiency, the invention proposes solution gas infrared detecting device and method in a kind of water using acoustooptical effect collimated light path,
Incident angle of the device using acousto-optic modulator to Laser Output Beam relative to closed gas chamber carries out automatically controlled adjusting,
In the case where being passed through Standard Gases into gas chamber, by the shape and amplitude of the acquired second harmonic signal of procedure judges whether
It meets the requirements, successively the driving signal of feedback adjustment acousto-optic modulator, until optical path reaches collimation requirements.
To achieve the above object, The technical solution adopted by the invention is as follows:
Solution gas infrared detecting device in a kind of water using acoustooptical effect collimated light path, including opticator, electric department
Point, slave part and mechanical part；Opticator includes light source module, acousto-optic modulator, closed gas chamber, photodetection mould
Block, the light source module, acousto-optic modulator, closed gas chamber, photoelectric detection module point-blank, form linear light
Line structure；Electric department point includes power module, light source driver module, acousto-optic drive module, gas chamber temperature control module, gas chamber pressure control mould
Block, data acquisition module, locking phase amplification module, dsp processor module, host computer communication module；The gas chamber temperature control module
Including heating sheet, temperature sensor and temperature-adjusting circuit, the output end of temperature-adjusting circuit is defeated with heating sheet and temperature sensor respectively
Enter end electrical connection；The gas chamber pressure control module includes pressure sensor, flow control valve and pressure control circuit, pressure control circuit it is defeated
Outlet is electrically connected with the input terminal of pressure sensor and flow control valve respectively；Slave part includes air pump module；Mechanical part
Go out including cylinder-shaped sealing shell, upper platform, lower layer's platform, front panel, rear panel, 24V power inlet, the communications cable
Mouth, gas vent, gas access；
Wherein the input terminal of light source module is electrically connected with the output end of the light source driver module in electricity part；Light source module
Output end be connected with the optical input port of acousto-optic modulator；The electricity input terminal of acousto-optic modulator is defeated with acousto-optic drive module
Outlet electrical connection；The optics output end of acousto-optic modulator is connected with the optical input port of closed gas chamber；The light of closed gas chamber
Output end is learned to be connected with the input terminal of photoelectric detection module；Gas output end, that is, gas outlet of closed gas chamber and air pump module
Input terminal is connected via gas pipeline；The output end of photoelectric detection module is electrically connected with the input terminal of locking phase amplification module；
In electricity part dsp processor module respectively with the input terminal of host computer communication module, light source driver module it is defeated
Enter end, the input terminal of acousto-optic drive module, the input terminal of pressure control circuit in gas chamber pressure control module, the control in gas chamber temperature control module
Air pump module electrical connection in the input terminal and slave part of circuit temperature；The output end of host computer communication module goes out with the communications cable
Mouth connection；The output end of pressure control circuit in gas chamber pressure control module is electric with the input terminal of pressure sensor and flow control valve respectively
Connection；The output end of flow control valve is connected with gas input, that is, air intake of the closed gas chamber；Flow control valve
Gas input be connected with gas access；The internal gas of pressure sensor and closed gas chamber is connected by flow control valve
Logical, the output end of pressure sensor and the input terminal of data acquisition module connect；The heating sheet of gas chamber temperature control module is wrapped in envelope
The outside of enclosed gas chamber；Temperature sensor is sealed in the inside of closed gas chamber, the input of output end and data acquisition module
End connection；The output end of temperature-adjusting circuit is electrically connected with the input terminal of heating sheet and temperature sensor respectively；Locking phase amplification module
Output end is electrically connected with the input terminal of data acquisition module；The output end of data acquisition module and the input of dsp processor module
End electrical connection；The output end of power module is connected with the modules in electricity part；
The input terminal of air pump module is connected with gas output end, that is, gas outlet of closed gas chamber in slave part, air pump mould
The output end of block is connected with gas vent, while air pump module is also electrically connected with dsp processor module；
Upper platform and lower layer's platform in the mechanical part are fixed in cylinder-shaped sealing shell, and front panel is with after
Panel is separately mounted to cylinder-shaped sealing shell two sides, and wherein upper platform is for installing opticator, slave part and electricity
The temperature sensor and heating sheet in gas chamber temperature control module in the department of the Chinese Academy of Sciences point, lower layer's platform is for installing electricity part, wherein electricity
Only temperature-adjusting circuit is arranged in lower layer's platform in gas chamber temperature control module in the department of the Chinese Academy of Sciences point；24V power inlet, communications cable outlet
Setting is on the front panel；Gas access, gas vent are arranged on plate below；The input of 24V power inlet and power module
End connection；Communications cable outlet is connect with the output end of host computer communication module；The input terminal of gas access and flow control valve
It is connected；Gas vent is connected with the output end of air pump module via gas pipeline.
The application method of solution gas infrared detecting device in a kind of water using above-mentioned acoustooptical effect collimated light path, has standard
Directly, it demarcates, measure three kinds of operating modes, specific as follows:
1 under collimated mode, which is placed in laboratory applications environment, using bottled object gas as the invention
Auxiliary collimation material, the specific steps are as follows:
(a) voltage is provided to power module by 24V power inlet, so that it be made to generate electricity part, air pump module
Required operating voltage；Dsp processor module via each module of data collecting module collected operating voltage, if abnormal, then
Interrupt alignment procedure；If voltage normally if enter step (b)；
(b) gas pipeline is utilized, gas access is connected on the steel cylinder of bottled object gas, steel cylinder pressure reducing valve is adjusted
Pressure makes it meet the inlet pressure requirements of flow control valve；Air pump module is opened, bottled target is pumped into closed gas chamber
Gas；Dsp processor module adjusts the gas flow rate of flow control valve, and is read in closed gas chamber by pressure sensor
Pressure makes pressure in closed gas chamber reach setting value by feedback control；
(c) dsp processor module adjusts the operating voltage of heating sheet, and reads closed gas chamber by temperature sensor
Temperature makes the temperature of closed gas chamber reach setting value by feedback control；
(d) dsp processor module starts light source driver module, and the operating temperature for adjusting light source module is setting value；
(e) dsp processor module applies triangular signal and sine wave signal to light source driver module, sends out light source module
The infrared signal that wavelength is scanned and modulates out；
(f) light source module, acousto-optic modulator, closed gas chamber, photoelectric detection module are manually adjusted, light source module is issued
Infrared light be incident in photoelectric detection module after acousto-optic modulator, closed gas chamber；Locking phase amplification module is visited from photoelectricity
It surveys in the signal of module output and extracts second harmonic signal, and it is transferred to dsp processor module via data acquisition module；
(g) according to the initial value of the acousto-optic driving signal of setting, dsp processor module issues driving letter to acousto-optic drive module
Number, acousto-optic drive module generates the electric signal of special carrier frequency to drive acousto-optic modulator, and ultrasonic wave enters acousto-optic modulator
Afterwards, the refractive index of acousto-optic medium changes and forms grating, and incident infrared signal is situated between by acousto-optic at an angle
Diffraction will occur when matter, to change the direction of propagation of infrared light；
(h) second harmonic signal that dsp processor module is exported via data collecting module collected locking phase amplification module, and
It is compared with the standard second harmonic signal being calculated from database, calculates the similarity of harmonic signal, and will
It is stored into internal storage；
(i) output voltage, closed gas chamber pressure, the closed gas chamber of dsp processor Module cycle monitoring power module
Whether normal temperature observes it；Step (a) is returned to if abnormal,；If normal, according to the driving of the acousto-optic drive module of setting
Signal adjusts wavelength, modifies acousto-optic driving signal, repeats step (g)~(i), until circulation terminates；
(j) maximum similarity is found out from the similarity result being calculated, and determines corresponding acousto-optic driving
Driving signal, that is, driving voltage value of module, as the optimal driving signal of acousto-optic drive module；
(k) dsp processor module successively closes light source driver module, acousto-optic drive module, air pump module, and pressure controls mould
Block, temperature control modules, photoelectric detection module, data acquisition module；
(l) dsp processor module, power module is turned off manually, end of collimation adjusts process；
2 under calibration mode, which is placed in laboratory applications environment, using air distribution system, bottled nitrogen, bottled mesh
Auxiliary calibration equipment or material of the standard gas body as the invention, the specific steps are as follows:
(a) voltage is provided to power module by 24V power inlet, to generate needed for electricity part, air pump module
Operating voltage；Dsp processor module is then interrupted if abnormal, via the operating voltage of each module of data collecting module collected
Calibration process；Then enter step (b) if normal；
(b) concentration range for the object gas demarcated as needed and the flow adjustment range of air distribution system, determine bottled
The concentration of object gas, using bottled nitrogen, bottled object gas as the input gas of air distribution system, using gas pipeline,
Gas access is connected on the delivery outlet of air distribution system；
(c) bottled nitrogen of air distribution system, the stream of bottled object gas is arranged in the target gas levels demarcated as needed
Amount, the object gas of concentration needed for generating；
(d) air pump module is opened, the object gas for needing to demarcate concentration is pumped into gas chamber；Pass through dsp processor module
The gas flow rate for adjusting flow control valve, and reads the pressure in closed gas chamber by pressure sensor, by feedback control,
Pressure in closed gas chamber is set to reach setting value；
(e) dsp processor module adjusts the operating voltage of heating sheet, and reads closed gas chamber by temperature sensor
Temperature makes the temperature of closed gas chamber reach setting value by feedback control；
(f) dsp processor module starts light source driver module, and the operating temperature for adjusting light source module is setting value；
(g) dsp processor module applies triangular signal and sine wave signal to light source driver module, sends out light source module
The infrared signal that wavelength is scanned and modulates out；
(h) according to collimated mode optimum results, dsp processor module issues optimal drive voltage to acousto-optic drive module
Value；The infrared light for issuing light source module is incident in photoelectric detection module after acousto-optic modulator, closed gas chamber；Locking phase
Amplification module extracts second harmonic signal from the signal that photoelectric detection module exports, and it is transmitted via data acquisition module
To dsp processor module；
(i) according to the acquisition time of the gaseous sample of each calibration concentration, dsp processor module is via data acquisition module
The second harmonic signal that circle collection locking phase amplification module obtains within this sampling period, obtains the amplitude of second harmonic signal
And it is stored in internal storage；After reaching acquisition time, the average value of acquired second harmonic signal amplitude is calculated, and
Its concentration together with marked gas is stored in internal storage；
(j) output voltage, closed gas chamber pressure, the closed gas chamber of dsp processor Module cycle monitoring power module
Whether normal temperature observes it；Step (a) is returned to if abnormal,；If normal, according to next calibration concentration of setting, adjustment
The flow of air distribution system two input cyclinder gas, repeats step (c)~(j), until whole concentration calibrations terminate；
(k) according to cycle labeling as a result, fitting the linear pass of second harmonic signal amplitude Yu institute's marked gas concentration
System, by fitting coefficient storage into the internal storage of dsp processor module；
(l) dsp processor module successively closes light source driver module, acousto-optic drive module, air pump module, and pressure controls mould
Block, temperature control modules, photoelectric detection module, data acquisition module；
(m) dsp processor module, power module is turned off manually, terminates calibration process；
3 in measurement mode, which is placed in submerged applications environment, using underwater gas-liquid separation equipment, overwater boat body
Deck monitors the assistance application equipment of computer, overwater boat body deck 24V power supply as the invention, the specific steps are as follows:
(a) above deck, using gas pipeline, gas access is connected to the gas delivery port of underwater gas-liquid separation equipment
On；Operating voltage is provided to power module via 24V power inlet by cable using overwater boat body deck 24V power supply,
Thus operating voltage needed for generating electricity part, air pump module；Overwater boat body deck monitors computer by cable and leads to
Communication cable outlet is connect with host computer communication module, is acquired using dsp processor module via each mould of data collecting module collected
The operating voltage of block, and overwater boat body deck monitoring computer is transmitted it to, until its is working properly；By underwater gas-liquid separation
Equipment and apparatus of the present invention are placed in pressure-resistant cabin, and are placed in water by towed body；
(b) overwater boat body deck monitors computer and sends starting measuring command to dsp processor module；
(c) dsp processor module opens air pump module, and the gas of gas-liquid separation equipment output is pumped into closed gas chamber
Body；Dsp processor module adjusts the gas flow rate of flow control valve, and reads the pressure in closed gas chamber by pressure sensor
Power, and transmit it to overwater boat body deck monitoring computer；By feedback control, pressure in closed gas chamber is made to reach setting
Value；
(d) dsp processor module adjusts the operating voltage of heating sheet, and reads closed gas chamber by temperature sensor
Temperature makes the temperature of closed gas chamber reach setting value by feedback control；
(e) dsp processor module starts light source driver module, adjusts the operating temperature of light source module, makes its setting value；
(f) dsp processor module applies triangular signal and sine wave signal to light source driver module, sends out light source module
The infrared signal that wavelength is scanned and modulates out；
(g) according to collimation as a result, dsp processor module sets the voltage of acousto-optic drive module as optimal drive voltage
Value；The infrared light for issuing light source module is incident in photoelectric detection module after acousto-optic modulator, closed gas chamber；
(h) locking phase amplification module extracts second harmonic signal from the signal that photoelectric detection module exports, and by its via
Data acquisition module is transferred to dsp processor module；
(i) dsp processor module is according to the obtained second harmonic signal amplitude of sampling and according to the object gas of calibration
The linear relationship of concentration and second harmonic signal amplitude calculates the concentration of under test gas, and it is transmitted to via cable
Monitoring computer in deck in ship structure；
(j) output voltage, closed gas chamber pressure, the closed gas chamber of dsp processor Module cycle monitoring power module
Whether normal temperature observes it；Alarm command then is issued to deck monitoring computer if abnormal,；If normal, then inquire whether
It is connected to the stopping measuring command that monitoring computer is sent；If receiving stopping measuring command, step (k) is gone to；If not being connected to
Stop measuring command, then repeatedly step (h)~(j)；
(k) dsp processor module successively closes light source driver module, acousto-optic drive module, air pump module, and pressure controls mould
Block, temperature control modules, photoelectric detection module, data acquisition module；
(l) hand off overwater boat body deck 24V power supply above deck terminates measurement process.
Need the concentration range for the object gas demarcated should be with different depth described in step (b) in the step 2
The target gas levels range for being lauched middle dissolution is consistent, and the concentration of bottled object gas is greater than this range, such ability
The object gas of various concentration is configured by air distribution system.
According to cycle labeling as a result, fitting second harmonic signal amplitude described in step (k) in the step 2
Linear relationship with institute marked gas concentration is fitted with Origin software, our average width second harmonic signal
Value and the concentration of institute's marked gas import software and can be fitted to it and acquire fitting coefficient.
Beneficial effects of the present invention:
(1) present invention is by using full-automatic optical beam collimation method, using acousto-optic modulator to Laser Output Beam
Incident angle carries out automatically controlled adjusting, in the case where being passed through collimation gas into gas chamber, is acquired by procedure judges secondary
Whether the shape and amplitude of harmonic signal meet the requirements, the driving signal of feedback adjustment acousto-optic modulator, until optical path reaches quasi-
It is straight to require, reduce the alignment procedure of sensor optical system.
(2) The present invention gives a kind of linear light channel structure based on acousto-optic modulator, simplifies sensing system
Optics complexity improves the stability, reliability and portability of instrument, is more suitable for underwater operation environment.
(3) for the optical system and sensor that collimate manually, the present invention can be using collimation gas online to light
The collimation on road can be carried out judgement, to improve the sensing capabilities of underwater traverse measurement environment.
Detailed description of the invention
Fig. 1 is structural block diagram of the invention；
Fig. 2 is cylinder-shaped sealing shell structural schematic diagram of the invention；
Fig. 3 is cylinder-shaped sealing shell internal structure schematic block diagram of the invention；
Fig. 4 is cylinder-shaped sealing shell front panel detail view of the invention；
Fig. 5 is cylinder-shaped sealing shell rear panel detail view of the invention；
Fig. 6 is active configuration figure of the present invention under collimated mode；
Fig. 7 is active configuration figure of the present invention under calibration mode；
Fig. 8 is the active configuration figure of the present invention in measurement mode；
Fig. 9 is work flow diagram of the present invention under collimated mode；
Figure 10 is work flow diagram of the present invention under calibration mode；
Figure 11 is the work flow diagram of the present invention in measurement mode；
Figure 12 is the second harmonic signal waveform that the present invention is extracted using carbon dioxide as object gas.
Specific embodiment
As shown in Fig. 1,2,3,4 and 5, solution gas infrared detecting device in a kind of water using acoustooptical effect collimated light path,
Including opticator, electricity part, slave part and mechanical part；Opticator includes light source module, acousto-optic modulator, closing
Formula gas chamber, photoelectric detection module, the light source module, acousto-optic modulator, closed gas chamber, photoelectric detection module are straight at one
On line, linear light channel structure is formed；Electric department point includes power module, light source driver module, acousto-optic drive module, gas chamber control
Warm module, gas chamber pressure control module, data acquisition module, locking phase amplification module, dsp processor module, host computer communication module；Institute
The gas chamber temperature control module stated includes heating sheet, temperature sensor and temperature-adjusting circuit, the output end of temperature-adjusting circuit respectively with heating sheet
It is electrically connected with the input terminal of temperature sensor；The gas chamber pressure control module includes pressure sensor, flow control valve and pressure control
Circuit, the output end of pressure control circuit are electrically connected with the input terminal of pressure sensor and flow control valve respectively；Slave part includes
Air pump module；Mechanical part is defeated including cylinder-shaped sealing shell, upper platform, lower layer's platform, front panel, rear panel, 24V power supply
Entrance, communications cable outlet, gas vent, gas access；
Wherein the input terminal of light source module is electrically connected with the output end of the light source driver module in electricity part；Light source module
Output end be connected with the optical input port of acousto-optic modulator；The electricity input terminal of acousto-optic modulator is defeated with acousto-optic drive module
Outlet electrical connection；The optics output end of acousto-optic modulator is connected with the optical input port of closed gas chamber；The light of closed gas chamber
Output end is learned to be connected with the input terminal of photoelectric detection module；Gas output end, that is, gas outlet of closed gas chamber and air pump module
Input terminal is connected via gas pipeline；The output end of photoelectric detection module is electrically connected with the input terminal of locking phase amplification module；
In electricity part dsp processor module respectively with the input terminal of host computer communication module, light source driver module it is defeated
Enter end, the input terminal of acousto-optic drive module, the input terminal of pressure control circuit in gas chamber pressure control module, the control in gas chamber temperature control module
Air pump module electrical connection in the input terminal and slave part of circuit temperature；The output end of host computer communication module goes out with the communications cable
Mouth connection；The output end of pressure control circuit in gas chamber pressure control module is electric with the input terminal of pressure sensor and flow control valve respectively
Connection；The output end of flow control valve is connected with gas input, that is, air intake of the closed gas chamber；Flow control valve
Gas input be connected with gas access；The internal gas of pressure sensor and closed gas chamber is connected by flow control valve
Logical, the output end of pressure sensor and the input terminal of data acquisition module connect；The heating sheet of gas chamber temperature control module is wrapped in envelope
The outside of enclosed gas chamber；Temperature sensor is sealed in inside the metal shell of closed gas chamber, output end and data acquisition module
The input terminal of block connects；The output end of temperature-adjusting circuit is electrically connected with the input terminal of heating sheet and temperature sensor respectively；Power supply mould
The output end of block is electrically connected with the input terminal of data acquisition module；The output end of locking phase amplification module and data acquisition module it is defeated
Enter end electrical connection；The output end of data acquisition module is electrically connected with the input terminal of dsp processor module；The output end of power module
It is connected with the modules in electricity part；
The input terminal of air pump module is connected with gas output end, that is, gas outlet of closed gas chamber in slave part, air pump mould
The output end of block is connected with gas vent, while air pump module is also electrically connected with dsp processor module；
Upper platform and lower layer's platform in the mechanical part are fixed in cylinder-shaped sealing shell, and front panel is with after
Panel is separately mounted to cylinder-shaped sealing shell two sides, and wherein upper platform is for installing opticator, slave part and electricity
The temperature sensor and heating sheet in gas chamber temperature control module in the department of the Chinese Academy of Sciences point, lower layer's platform is for installing electricity part, wherein electricity
Only temperature-adjusting circuit is arranged in lower layer's platform in gas chamber temperature control module in the department of the Chinese Academy of Sciences point；24V power inlet, communications cable outlet
Setting is on the front panel；Gas access, gas vent are arranged on plate below；The input of 24V power inlet and power module
End connection；Communications cable outlet is connect with the output end of host computer communication module；The input terminal of gas access and flow control valve
It is connected；Gas vent is connected with the output end of air pump module via gas pipeline.
The application method of solution gas infrared detecting device in a kind of water using above-mentioned acoustooptical effect collimated light path, has standard
Directly, it demarcates, measure three kinds of operating modes, specific as follows:
1 under collimated mode, which is placed in laboratory applications environment, using bottled object gas as the invention
Auxiliary collimation material, as shown in Fig. 6 and Fig. 9, the specific steps are as follows:
(a) voltage is provided to power module by 24V power inlet, so that it be made to generate electricity part, air pump module
Required operating voltage；Dsp processor module via each module of data collecting module collected operating voltage, if abnormal, then
Interrupt alignment procedure；If voltage normally if enter step (b)；
(b) gas pipeline is utilized, gas access is connected on the steel cylinder of bottled object gas, steel cylinder pressure reducing valve is adjusted
Pressure makes it meet the inlet pressure requirements of flow control valve；Air pump module is opened, bottled target is pumped into closed gas chamber
Gas；Dsp processor module adjusts the gas flow rate of flow control valve, and is read in closed gas chamber by pressure sensor
Pressure makes pressure in closed gas chamber reach setting value by feedback control；
(c) dsp processor module adjusts the operating voltage of heating sheet, and reads closed gas chamber by temperature sensor
Temperature makes the temperature of closed gas chamber reach setting value by feedback control；
(d) dsp processor module starts light source driver module, and the operating temperature for adjusting light source module is setting value；
(e) dsp processor module applies triangular signal and sine wave signal to light source driver module, sends out light source module
The infrared signal that wavelength is scanned and modulates out；
(f) light source module, acousto-optic modulator, closed gas chamber, photoelectric detection module are manually adjusted, light source module is issued
Infrared light be incident in photoelectric detection module after acousto-optic modulator, closed gas chamber；Locking phase amplification module is visited from photoelectricity
It surveys in the signal of module output and extracts second harmonic signal, and it is transferred to dsp processor module via data acquisition module；
(g) according to the initial value of the acousto-optic driving signal of setting, dsp processor module issues driving letter to acousto-optic drive module
Number, acousto-optic drive module generates the electric signal of special carrier frequency to drive acousto-optic modulator, and ultrasonic wave enters acousto-optic modulator
Afterwards, the refractive index of acousto-optic medium changes and forms grating, and incident infrared signal is situated between by acousto-optic at an angle
Diffraction will occur when matter, to change the direction of propagation of infrared light；
(h) second harmonic signal that dsp processor module is exported via data collecting module collected locking phase amplification module, and
It is compared with the standard second harmonic signal being calculated from database, calculates the similarity of harmonic signal, and will
It is stored into internal storage；
(i) output voltage, closed gas chamber pressure, the closed gas chamber of dsp processor Module cycle monitoring power module
Whether normal temperature observes it；Step (a) is returned to if abnormal,；If normal, according to the driving of the acousto-optic drive module of setting
Signal adjusts wavelength, modifies acousto-optic driving signal, repeats step (g)~(i), until circulation terminates；
(j) maximum similarity is found out from the similarity result being calculated, and determines corresponding acousto-optic driving
Driving signal, that is, driving voltage value of module, as the optimal driving signal of acousto-optic drive module；
(k) dsp processor module successively closes light source driver module, acousto-optic drive module, air pump module, and pressure controls mould
Block, temperature control modules, photoelectric detection module, data acquisition module；
(l) dsp processor module, power module is turned off manually, end of collimation adjusts process；
2 under calibration mode, which is placed in laboratory applications environment, using air distribution system, bottled nitrogen, bottled mesh
Auxiliary calibration equipment or material of the standard gas body as the invention, as illustrated in fig. 7 and fig. 10, the specific steps are as follows:
(a) voltage is provided to power module by 24V power inlet, to generate needed for electricity part, air pump module
Operating voltage；Dsp processor module is then interrupted if abnormal, via the operating voltage of each module of data collecting module collected
Calibration process；Then enter step (b) if normal；
(b) concentration range for the object gas demarcated as needed and the flow adjustment range of air distribution system, determine bottled
The concentration of object gas, using bottled nitrogen, bottled object gas as the input gas of air distribution system, using gas pipeline,
Gas access is connected on the delivery outlet of air distribution system；
(c) bottled nitrogen of air distribution system, the stream of bottled object gas is arranged in the target gas levels demarcated as needed
Amount, the object gas of concentration needed for generating；
(d) air pump module is opened, the object gas for needing to demarcate concentration is pumped into gas chamber；Pass through dsp processor module
The gas flow rate for adjusting flow control valve, and reads the pressure in closed gas chamber by pressure sensor, by feedback control,
Pressure in closed gas chamber is set to reach setting value；
(e) dsp processor module adjusts the operating voltage of heating sheet, and reads closed gas chamber by temperature sensor
Temperature makes the temperature of closed gas chamber reach setting value by feedback control；
(f) dsp processor module starts light source driver module, and the operating temperature for adjusting light source module is setting value；
(g) dsp processor module applies triangular signal and sine wave signal to light source driver module, sends out light source module
The infrared signal that wavelength is scanned and modulates out；
(h) according to collimated mode optimum results, dsp processor module issues optimal drive voltage to acousto-optic drive module
Value；The infrared light for issuing light source module is incident in photoelectric detection module after acousto-optic modulator, closed gas chamber；Locking phase
Amplification module extracts second harmonic signal from the signal that photoelectric detection module exports, and it is transmitted via data acquisition module
To dsp processor module；
(i) according to the acquisition time of the gaseous sample of each calibration concentration, dsp processor module is via data acquisition module
The second harmonic signal that circle collection locking phase amplification module obtains within this sampling period, obtains the amplitude of second harmonic signal
And it is stored in internal storage；After reaching acquisition time, the average value of acquired second harmonic signal amplitude is calculated, and
Its concentration together with marked gas is stored in internal storage；
(j) output voltage, closed gas chamber pressure, the closed gas chamber of dsp processor Module cycle monitoring power module
Whether normal temperature observes it；Step (a) is returned to if abnormal,；If normal, according to next calibration concentration of setting, adjustment
The flow of air distribution system two input cyclinder gas, repeats step (c)~(j), until whole concentration calibrations terminate；
(k) according to cycle labeling as a result, fitting the linear pass of second harmonic signal amplitude Yu institute's marked gas concentration
System, by fitting coefficient storage into the internal storage of dsp processor module；
(l) dsp processor module successively closes light source driver module, acousto-optic drive module, air pump module, and pressure controls mould
Block, temperature control modules, photoelectric detection module, data acquisition module；
(m) dsp processor module, power module is turned off manually, terminates calibration process；
3 in measurement mode, which is placed in submerged applications environment, using underwater gas-liquid separation equipment, overwater boat body
Deck monitors the assistance application equipment of computer, overwater boat body deck 24V power supply as the invention, as shown in Figure 8 and Figure 11, tool
Steps are as follows for body:
(a) above deck, using gas pipeline, gas access is connected to the gas delivery port of underwater gas-liquid separation equipment
On；Operating voltage is provided to power module via 24V power inlet by cable using overwater boat body deck 24V power supply,
Thus operating voltage needed for generating electricity part, air pump module；Overwater boat body deck monitors computer by cable and leads to
Communication cable outlet is connect with host computer communication module, is acquired using dsp processor module via each mould of data collecting module collected
The operating voltage of block, and overwater boat body deck monitoring computer is transmitted it to, until its is working properly；By underwater gas-liquid separation
Equipment and apparatus of the present invention are placed in pressure-resistant cabin, and are placed in water by towed body；
(b) overwater boat body deck monitors computer and sends starting measuring command to dsp processor module；
(c) dsp processor module opens air pump module, and the gas of gas-liquid separation equipment output is pumped into closed gas chamber
Body；Dsp processor module adjusts the gas flow rate of flow control valve, and reads the pressure in closed gas chamber by pressure sensor
Power, and transmit it to overwater boat body deck monitoring computer；By feedback control, pressure in closed gas chamber is made to reach setting
Value；
(d) dsp processor module adjusts the operating voltage of heating sheet, and reads closed gas chamber by temperature sensor
Temperature makes the temperature of closed gas chamber reach setting value by feedback control；
(e) dsp processor module starts light source driver module, adjusts the operating temperature of light source module, makes its setting value；
(f) dsp processor module applies triangular signal and sine wave signal to light source driver module, sends out light source module
The infrared signal that wavelength is scanned and modulates out；
(g) according to collimation as a result, dsp processor module sets the voltage of acousto-optic drive module as optimal drive voltage
Value；The infrared light for issuing light source module is incident in photoelectric detection module after acousto-optic modulator, closed gas chamber；
(h) locking phase amplification module extracts second harmonic signal from the signal that photoelectric detection module exports, and by its via
Data acquisition module is transferred to dsp processor module；
(i) dsp processor module is according to the obtained second harmonic signal amplitude of sampling and according to the object gas of calibration
The linear relationship of concentration and second harmonic signal amplitude, can Inversion Calculation go out the concentration of under test gas, and by it via cable
Line is transmitted to the monitoring computer in deck in ship structure；
(j) output voltage, closed gas chamber pressure, the closed gas chamber of dsp processor Module cycle monitoring power module
Whether normal temperature observes it；Alarm command then is issued to deck monitoring computer if abnormal,；If normal, then inquire whether
It is connected to the stopping measuring command that monitoring computer is sent；If receiving stopping measuring command, step (k) is gone to；If not being connected to
Stop measuring command, then repeatedly step (h)~(j)；
(k) dsp processor module successively closes light source driver module, acousto-optic drive module, air pump module, and pressure controls mould
Block, temperature control modules, photoelectric detection module, data acquisition module；
(l) hand off overwater boat body deck 24V power supply above deck terminates measurement process.
Need the concentration range for the object gas demarcated should be with different depth described in step (b) in the step 2
The target gas levels range for being lauched middle dissolution is consistent, and the concentration of bottled object gas is greater than this range, such ability
The object gas of various concentration is configured by air distribution system.
According to cycle labeling as a result, fitting second harmonic signal amplitude described in step (k) in the step 2
Linear relationship with institute marked gas concentration is fitted with Origin software, our average width second harmonic signal
Value and the concentration of institute's marked gas import software and can be fitted to it and acquire fitting coefficient.
The light source module that the present embodiment uses is 4319nm interband cascade lasers for the wavelength of German Nanoplus company；
The acousto-optic modulator used is the I-M0XX-XC11B76-P5-GH105 of Gooch&Housego；The closed gas chamber used is light
Journey is the intensive hot spot type multi-pass pond of 26m；The photoelectric detection module used infrared mercury-cadmium tellurid detector in.
Referring to Figure 12, carry out the signal waveform that experiment measures for the standard carbon dioxide gas sample that concentration is 5ppm,
The pressure position 40Torr used is tested, temperature is 20 DEG C.Tu Zhong top set curve be photoelectric detection module output signal, lower point
Branch curve is the secondary waveform signal of locking phase amplification module output.It can be found that there are two apparent carbon dioxide gas in figure
The absorption peak (top set) and corresponding second harmonic (inferior division) of body.
Claims (4)
1. solution gas infrared detecting device in a kind of water using acoustooptical effect collimated light path, it is characterised in that including optical section
Point, electricity part, slave part and mechanical part；Opticator includes light source module, acousto-optic modulator, closed gas chamber, light
Electric detecting module, the light source module, acousto-optic modulator, closed gas chamber, photoelectric detection module point-blank, are formed
Linear light channel structure；Electric department point includes power module, light source driver module, acousto-optic drive module, gas chamber temperature control module, gas
Room pressure control module, data acquisition module, locking phase amplification module, dsp processor module, host computer communication module；The gas chamber
Temperature control module includes heating sheet, temperature sensor and temperature-adjusting circuit, and the output end of temperature-adjusting circuit is passed with heating sheet and temperature respectively
The input terminal of sensor is electrically connected；The gas chamber pressure control module includes pressure sensor, flow control valve and pressure control circuit, pressure control
The output end of circuit is electrically connected with the input terminal of pressure sensor and flow control valve respectively；Slave part includes air pump module；
Mechanical part includes cylinder-shaped sealing shell, upper platform, lower layer's platform, front panel, rear panel, 24V power inlet, communication
Cable exits, gas vent, gas access；
Wherein the input terminal of light source module is electrically connected with the output end of the light source driver module in electricity part；Light source module it is defeated
Outlet is connected with the optical input port of acousto-optic modulator；The electricity input terminal of acousto-optic modulator and the output end of acousto-optic drive module
Electrical connection；The optics output end of acousto-optic modulator is connected with the optical input port of closed gas chamber；The optics of closed gas chamber is defeated
Outlet is connected with the input terminal of photoelectric detection module；Gas output end, that is, gas outlet of closed gas chamber and the input of air pump module
End is connected via gas pipeline；The output end of photoelectric detection module is electrically connected with the input terminal of locking phase amplification module；
In electricity part dsp processor module respectively with the input terminal of host computer communication module, light source driver module input terminal,
The input terminal of acousto-optic drive module, the input terminal of pressure control circuit in gas chamber pressure control module, the temperature control electricity in gas chamber temperature control module
Air pump module electrical connection in the input terminal and slave part on road；Output end and the communications cable outlet of host computer communication module connect
It connects；Input terminal of the output end of pressure control circuit in gas chamber pressure control module respectively with pressure sensor and flow control valve is electrically connected
It connects；The output end of flow control valve is connected with gas input, that is, air intake of the closed gas chamber；Flow control valve
Gas input is connected with gas access；Pressure sensor is connected to the internal gas of closed gas chamber by flow control valve,
The output end of pressure sensor and the input terminal of data acquisition module connect；The heating sheet of gas chamber temperature control module is wrapped in closed
The outside of gas chamber；Temperature sensor is sealed in the inside of closed gas chamber, the input terminal company of output end and data acquisition module
It connects；The output end of temperature-adjusting circuit is electrically connected with the input terminal of heating sheet and temperature sensor respectively；The output of locking phase amplification module
End is electrically connected with the input terminal of data acquisition module；The output end of data acquisition module and the input terminal electricity of dsp processor module
Connection；The output end of power module is connected with the modules in electricity part；
The input terminal of air pump module is connected with gas output end, that is, gas outlet of closed gas chamber in slave part, air pump module
Output end is connected with gas vent, while air pump module is also electrically connected with dsp processor module；
Upper platform and lower layer's platform in the mechanical part are fixed in cylinder-shaped sealing shell, front panel and rear panel
Cylinder-shaped sealing shell two sides are separately mounted to, wherein upper platform is for installing opticator, slave part and electric department
The temperature sensor and heating sheet in gas chamber temperature control module in point, lower layer's platform are used to install electricity part, wherein electric department
Only temperature-adjusting circuit is arranged in lower layer's platform in gas chamber temperature control module in point；24V power inlet, communications cable outlet setting
On the front panel；Gas access, gas vent are arranged on plate below；The input terminal of 24V power inlet and power module connects
It connects；Communications cable outlet is connect with the output end of host computer communication module；Gas access is connected with the input terminal of flow control valve；
Gas vent is connected with the output end of air pump module via gas pipeline.
2. the application method of solution gas infrared detecting device in a kind of water using above-mentioned acoustooptical effect collimated light path has standard
Directly, it demarcates, measure three kinds of operating modes, specific as follows:
One, under collimated mode, which is placed in laboratory applications environment, using bottled object gas as the auxiliary of the invention
Help collimation material, the specific steps are as follows:
(a) voltage is provided to power module by 24V power inlet, so that it be made to generate needed for electricity part, air pump module
Operating voltage；Dsp processor module is then interrupted if abnormal, via the operating voltage of each module of data collecting module collected
Alignment procedure；If voltage normally if enter step (b)；
(b) gas pipeline is utilized, gas access is connected on the steel cylinder of bottled object gas, the pressure of steel cylinder pressure reducing valve is adjusted
Power makes it meet the inlet pressure requirements of flow control valve；Air pump module is opened, bottled target gas is pumped into closed gas chamber
Body；Dsp processor module adjusts the gas flow rate of flow control valve, and reads the pressure in closed gas chamber by pressure sensor
Power makes pressure in closed gas chamber reach setting value by feedback control；
(c) dsp processor module adjusts the operating voltage of heating sheet, and the temperature of closed gas chamber is read by temperature sensor
Degree, by feedback control, makes the temperature of closed gas chamber reach setting value；
(d) dsp processor module starts light source driver module, and the operating temperature for adjusting light source module is setting value；
(e) dsp processor module applies triangular signal and sine wave signal to light source driver module, and light source module is made to issue wave
Long scanned and modulation infrared signal；
(f) light source module, acousto-optic modulator, closed gas chamber, photoelectric detection module are manually adjusted, issues light source module red
Outer light is incident in photoelectric detection module after acousto-optic modulator, closed gas chamber；Locking phase amplification module is from photodetection mould
Second harmonic signal is extracted in the signal of block output, and it is transferred to dsp processor module via data acquisition module；
(g) according to the initial value of the acousto-optic driving signal of setting, dsp processor module issues driving signal to acousto-optic drive module,
Acousto-optic drive module generates the electric signal of special carrier frequency come after driving acousto-optic modulator, ultrasonic wave to enter acousto-optic modulator,
The refractive index of acousto-optic medium changes and forms grating, when incident infrared signal passes through acousto-optic medium at an angle
Diffraction will occur, to change the direction of propagation of infrared light；
(h) second harmonic signal that dsp processor module is exported via data collecting module collected locking phase amplification module, and by its
It is compared with the standard second harmonic signal being calculated from database, calculates the similarity of harmonic signal, and deposited
It stores up in internal storage；
(i) output voltage, the closed gas chamber pressure, closed gas room temperature of dsp processor Module cycle monitoring power module,
Whether normal observe it；Step (a) is returned to if abnormal,；If normal, according to the driving signal tune of the acousto-optic drive module of setting
Whole wavelength modifies acousto-optic driving signal, repeats step (g)~(i), until circulation terminates；
(j) maximum similarity is found out from the similarity result being calculated, and determines corresponding acousto-optic drive module
Driving signal, that is, driving voltage value, as the optimal driving signal of acousto-optic drive module；
(k) dsp processor module successively closes light source driver module, acousto-optic drive module, air pump module, pressure control module,
Temperature control modules, photoelectric detection module, data acquisition module；
(l) dsp processor module, power module is turned off manually, end of collimation adjusts process；
Two, under calibration mode, which is placed in laboratory applications environment, using air distribution system, bottled nitrogen, bottled target
Auxiliary calibration equipment or material of the gas as the invention, the specific steps are as follows:
(a) voltage is provided to power module by 24V power inlet, thus work needed for generating electricity part, air pump module
Make voltage；Dsp processor module then interrupts calibration via the operating voltage of each module of data collecting module collected if abnormal,
Process；Then enter step (b) if normal；
(b) concentration range for the object gas demarcated as needed and the flow adjustment range of air distribution system, determine bottled target
The concentration of gas, using bottled nitrogen, bottled object gas as the input gas of air distribution system, using gas pipeline, by gas
Body entrance is connected on the delivery outlet of air distribution system；
(c) bottled nitrogen of air distribution system, the flow of bottled object gas is arranged in the target gas levels demarcated as needed,
The object gas of concentration needed for generating；
(d) air pump module is opened, the object gas for needing to demarcate concentration is pumped into gas chamber；It is adjusted by dsp processor module
The gas flow rate of flow control valve, and the pressure in closed gas chamber is read by pressure sensor, by feedback control, make to seal
Pressure reaches setting value in enclosed gas chamber；
(e) dsp processor module adjusts the operating voltage of heating sheet, and the temperature of closed gas chamber is read by temperature sensor
Degree, by feedback control, makes the temperature of closed gas chamber reach setting value；
(f) dsp processor module starts light source driver module, and the operating temperature for adjusting light source module is setting value；
(g) dsp processor module applies triangular signal and sine wave signal to light source driver module, and light source module is made to issue wave
Long scanned and modulation infrared signal；
(h) according to collimated mode optimum results, dsp processor module issues optimal drive voltage value to acousto-optic drive module；Make
The infrared light that light source module issues is incident in photoelectric detection module after acousto-optic modulator, closed gas chamber；Locking phase amplification
Module extracts second harmonic signal from the signal that photoelectric detection module exports, and it is transmitted to via data acquisition module
Dsp processor module；
(i) according to the acquisition time of the gaseous sample of each calibration concentration, dsp processor module is via data acquisition module at this
The second harmonic signal that circle collection locking phase amplification module obtains in a sampling period obtains the amplitude of second harmonic signal and incites somebody to action
It is stored into internal storage；After reaching acquisition time, calculate the average value of acquired second harmonic signal amplitude, and by its
It is stored in internal storage together with the concentration of marked gas；
(j) output voltage, the closed gas chamber pressure, closed gas room temperature of dsp processor Module cycle monitoring power module,
Whether normal observe it；Step (a) is returned to if abnormal,；If normal, according to next calibration concentration of setting, distribution is adjusted
The flow of system two input cyclinder gas, repetition step (c)~
(j), until whole concentration calibrations terminate；
It (k), will according to cycle labeling as a result, fit the linear relationship of second harmonic signal amplitude Yu institute's marked gas concentration
Fitting coefficient is stored into the internal storage of dsp processor module；
(l) dsp processor module successively closes light source driver module, acousto-optic drive module, air pump module, pressure control module,
Temperature control modules, photoelectric detection module, data acquisition module；
(m) dsp processor module, power module is turned off manually, terminates calibration process；
Three, which in measurement mode, is placed in submerged applications environment, using underwater gas-liquid separation equipment, overwater boat body first
The assistance application equipment of board monitoring computer, overwater boat body deck 24V power supply as the invention, the specific steps are as follows:
(a) above deck, using gas pipeline, gas access is connected on the gas delivery port of underwater gas-liquid separation equipment；
Operating voltage is provided to power module via 24V power inlet by cable using overwater boat body deck 24V power supply, thus
Operating voltage needed for generating electricity part, air pump module；Overwater boat body deck monitors computer and passes through cable and communication electricity
Cable outlet is connect with host computer communication module, is acquired using dsp processor module via each module of data collecting module collected
Operating voltage, and overwater boat body deck monitoring computer is transmitted it to, until its is working properly；By underwater gas-liquid separation equipment
And apparatus of the present invention are placed in pressure-resistant cabin, and are placed in water by towed body；
(b) overwater boat body deck monitors computer and sends starting measuring command to dsp processor module；
(c) dsp processor module opens air pump module, and the gas of gas-liquid separation equipment output is pumped into closed gas chamber；DSP
Processor module adjusts the gas flow rate of flow control valve, and reads the pressure in closed gas chamber by pressure sensor, and
Transmit it to overwater boat body deck monitoring computer；By feedback control, pressure in closed gas chamber is made to reach setting value；
(d) dsp processor module adjusts the operating voltage of heating sheet, and the temperature of closed gas chamber is read by temperature sensor
Degree, by feedback control, makes the temperature of closed gas chamber reach setting value；
(e) dsp processor module starts light source driver module, adjusts the operating temperature of light source module, makes its setting value；
(f) dsp processor module applies triangular signal and sine wave signal to light source driver module, and light source module is made to issue wave
Long scanned and modulation infrared signal；
(g) according to collimation as a result, dsp processor module sets the voltage of acousto-optic drive module as optimal drive voltage value；Make
The infrared light that light source module issues is incident in photoelectric detection module after acousto-optic modulator, closed gas chamber；
(h) locking phase amplification module extracts second harmonic signal from the signal that photoelectric detection module exports, and by it via data
Acquisition module is transferred to dsp processor module；
(i) dsp processor module is according to the obtained second harmonic signal amplitude of sampling and according to the target gas levels of calibration
With the linear relationship of second harmonic signal amplitude, the concentration of under test gas is calculated, and it is transmitted to hull via cable
Monitoring computer on deck；
(j) output voltage, the closed gas chamber pressure, closed gas room temperature of dsp processor Module cycle monitoring power module,
Whether normal observe it；Alarm command then is issued to deck monitoring computer if abnormal,；If normal, then it inquires and whether is connected to
Monitor the stopping measuring command that computer is sent；If receiving stopping measuring command, step (k) is gone to；If not being connected to stopping
Measuring command, then repeatedly step (h)~(j)；
(k) dsp processor module successively closes light source driver module, acousto-optic drive module, air pump module, pressure control module,
Temperature control modules, photoelectric detection module, data acquisition module；
(l) hand off overwater boat body deck 24V power supply above deck terminates measurement process.
3. solution gas infrared detecting device in a kind of water using above-mentioned acoustooptical effect collimated light path as claimed in claim 2
Application method, it is characterised in that the concentration range for the object gas for needing to demarcate described in the step (b) in the step 2
The target gas levels range that middle dissolution should be lauched with different depth is consistent, and the concentration of bottled object gas is greater than this model
It encloses, the object gas of various concentration could be configured by air distribution system in this way.
4. solution gas infrared detecting device in a kind of water using above-mentioned acoustooptical effect collimated light path as claimed in claim 2
Application method, it is characterised in that according to cycle labeling as a result, fitting secondary described in the step (k) in the step 2
The linear relationship of harmonic signal amplitude and institute's marked gas concentration is fitted with Origin software, we are second harmonic
The average amplitude of signal and the concentration of institute's marked gas, which import software, can be fitted it and acquire fitting coefficient.
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