CN105319173B - Gas remote measurement device and method - Google Patents
Gas remote measurement device and method Download PDFInfo
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- CN105319173B CN105319173B CN201510830103.5A CN201510830103A CN105319173B CN 105319173 B CN105319173 B CN 105319173B CN 201510830103 A CN201510830103 A CN 201510830103A CN 105319173 B CN105319173 B CN 105319173B
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Abstract
The present invention provides gas remote measurement device and method, the gas remote measurement device includes：The wavelength covering under test gas for the measurement light that light source is sent out, the absorption line of gas pool gas；Beam splitting device is used to the measurement light separating the first light beam and the second light beam, and first light beam passes through region to be measured；Light deflection module for changing the first light beam direction of travel；Gas cell, second light beam pass through the gas cell, the gas cell to accommodate gas known to concentration；First detector is used to that the measurement light in region to be measured will to be passed through to be converted to the first electric signal, and is transmitted to processor；Second detector is transmitted to processor for that the second light beam of the gas cell will be passed through to be converted to the second electric signal；Processor is used to adjust the running parameter of the light source, keeps the drift of the corresponding light source of first electric signal not exceeded；Angle of inclination for adjusting the smooth deflection module the first incident light beam relatively so that the interference between reflected light of first light beam on internal reflection body in region to be measured is not exceeded.The present invention have many advantages, such as high-precision, it is simple in structure, at low cost.
Description
Technical field
The present invention relates to photoelectric analysis more particularly to gas remote measurement device and methods.
Background technology
Natural gas is a kind of flammable explosive gas, and main component is methane, explosion limit 5%-16%.Existed in recent years
Huge prestige is caused because the explosion accident that fuel gas pipeline leakage causes happens occasionally, to the security of the lives and property of resident in all parts of the country
The side of body.For this purpose, gas company needs to carry out regular safety check and not to the leakage situation of natural gas facility in natural gas user room
Periodically selective examination.
Laser telemeter is the device for using natural gas leaking in extensive partition window telemetry building at present, and remote sensing instrument uses wavelength
Modulated spectrum (WMS) technology, basic principle are：Laser frequency is fixed near a certain absorption peak of methane, while to laser frequency
Rate carries out cosine-modulation, is detected according to frequency modulation(PFM) harmonic signal and the correlation of gas concentration, to obtain light path
On under test gas information.The type remote sensing instrument has many deficiencies, such as：
1. certain drift can occur since laser center wavelength varies with temperature, the mistake of gas concentration measurement can be caused
Difference；
2. being not used to the detection of each layer indoor gas in building.For the indoor telemetering with window, the prior art without
Method determines windowpane to the distance of metope, namely can not obtain indoor gas content；
Detection for the indoor gas of two layers of building or more, existing remote sensing instrument are helpless；
3. due to the barrier of glass, incoming laser beam can generate the reflected beams 1 and reflected light at the both sides interface of glass pane
Beam 2 can form interference between the reflected beams, greatly reduce the accuracy of detection to gas characteristic absorption peak on the detector.
Invention content
For the deficiency for solving in above-mentioned prior art, the present invention provides a kind of high and low cost of precision, application fields
Extensively, the strong gas remote measurement device of function.
The purpose of the present invention is what is be achieved through the following technical solutions：
Gas remote measurement device, the gas remote measurement device include：
Light source, known to the wavelength covering under test gas of the measurement light that an only light source is sent out, the concentration in gas cell
Gas absorption line；
Beam splitting device, the beam splitting device are used to the measurement light separating the first light beam and the second light beam, and described first
Light beam passes through region to be measured；
Light deflection module, the smooth deflection module for changing the first light beam direction of travel；
Gas cell, second light beam pass through the gas cell, the gas cell to accommodate gas known to concentration；
First detector, first detector will be for that will pass through first light beam in region to be measured to be converted to the first telecommunications
Number, and it is transmitted to processor；
Second detector, second detector will be for that will pass through the second light beam of the gas cell to be converted to the second telecommunications
Number, and it is transmitted to processor；
Processor, the processor are used to adjust the running parameter of the light source, make the corresponding light of second electric signal
The drift in source is not exceeded；Angle of inclination for adjusting the smooth deflection module the first incident light beam relatively so that the first electricity
Interference between reflected light of corresponding first light beam of signal on internal reflection body in region to be measured is not exceeded.
According to above-mentioned gas remote measurement device, optionally, the gas remote measurement device further comprises：
Unmanned plane, the light source, the first and second detectors, light deflection module, gas cell are mounted on the unmanned plane.
According to above-mentioned gas remote measurement device, optionally, the smooth deflection module further comprises：
Wedge-shaped transmission device, the wedge shape transmission device are fixed on the side of connector, and first light beam passes through described
Wedge-shaped transmission device；
The other side of connector, the connector is fixed at least two range adjusters；
The length of at least two range adjusters, at least two range adjusters is adjustable, for adjusting the connection
Inclined degree of the part relative to the first light beam.
According to above-mentioned gas remote measurement device, it is preferable that the range adjuster uses piezoelectric material.
According to above-mentioned gas remote measurement device, it is preferable that the light source is laser.
According to above-mentioned gas remote measurement device, optionally, gas known to the under test gas and concentration is identical or not
Same gas.
The present invention also aims to provide a kind of high-precision, the gas remote measurement method that application field is wide, powerful,
The goal of the invention is achieved by the following technical programs：
Gas remote measurement method, the gas remote measurement method include the following steps：
(A1) the measurement light that light source is sent out is divided into the first light beam and the second light beam, and the wavelength covering for measuring light is to be measured
The absorption line of gas known to gas, concentration；
(A2) first light beam passes through light deflection module, injects later in region to be measured, the first detector will be to be measured
The first light beam after gas absorbs is converted to the first electric signal, and is transmitted to processor；
Second light beam passes through gas known to concentration, the second detector that the second light beam of injection is converted to the second electricity
Signal, and it is transmitted to processor；
(A3) processor obtains the drift of the light source according to second electric signal, if drift is exceeded, described in adjustment
The running parameter of light source enters step (A1)；If not exceeded, enter step (A4)；
Processor is obtained according to first electric signal between reflected light of first light beam on internal reflection body in region to be measured
Interference signal adjusts the angle of inclination of the smooth deflection module the first incident light beam relatively, enters step if interference is exceeded
(A1)；If not exceeded, enter step (A4)；
(A4) processor handles first electric signal according to spectral technique, to obtain the content of under test gas.
According to above-mentioned gas remote measurement method, optionally, in step (A4), processor selects direct absorption spectroscopy techniques
Or wavelength modulation spectroscopy goes to handle first electric signal.
According to above-mentioned gas remote measurement method, optionally, the adjustment mode of the smooth deflection module is：
Length of the adjustment mounted at least two range adjusters of connector side so that it is another to be mounted on the connector
The inclined degree of the wedge-shaped transmission device relative measurement light of side changes, and passes through the wedge shape to transmit so as to adjust light is measured
Deflection angle after device.
According to above-mentioned gas remote measurement method, it is preferable that the range adjuster uses piezoelectric material.
According to above-mentioned gas remote measurement method, it is preferable that in step (A2), if the interference exceeds threshold value, adjust
The voltage value being applied on the range adjuster.
Compared with prior art, the device have the advantages that being：
1. making laser output wavelength be locked under test gas absorption peak centre wavelength by the way that feedback light path is arranged, wave is avoided
Long drift, keeps measurement result more accurate；
Interference effect of the monitoring in real time between measuring the reflected beams of the light on glass pane, when the noise that interference generates exceeds
After threshold value, incident angle of first light beam on glass pane is adjusted by adjusting the degree of deflection of the first light beam, to avoid
Interference, namely ensure that accuracy of detection；
2. directly absorbing (scanning DA) with scanning wavelength and two kinds of operating modes of Wavelength modulation spectroscopy (WMS) being optional.
Accuracy of measurement is high, and it is big to measure concentration range.
3. application field is wide, safety
Optical system is mounted on unmanned plane, unmanned plane flies to different height, to measure different buildings by telemetering
The content of indoor gas, has expanded application field in layer；Testing staff ensure that the life peace of testing staff without getting in
Entirely；
4. powerful
The content information measured can be sent on the communication terminal of owner in real time, even if will also realize that dawn indoor gas outside
Content finds natural gas leaking information early, excludes security risk.
Description of the drawings
With reference to attached drawing, the disclosure will be easier to understand.Skilled addressee readily understands that be：This
A little attached drawings are used only for the technical solution illustrated the present invention, and are not intended to and are construed as limiting to protection scope of the present invention.
In figure：
Fig. 1 is the basic block diagram of gas remote measurement device according to the ... of the embodiment of the present invention；
Fig. 2 is the basic block diagram of according to embodiments of the present invention 2 light deflection module.
Specific implementation mode
Fig. 1-2 and following description describe the present invention optional embodiment to instruct how those skilled in the art implement
It is of the invention with reproducing.In order to instruct technical solution of the present invention, some conventional aspects are simplified or have been omitted.Those skilled in the art
It should be appreciated that modification or replacement from these embodiments will within the scope of the invention.Those skilled in the art should understand that
Following characteristics can be combined in various ways to form multiple modifications of the present invention.As a result, the invention is not limited in it is following can
Embodiment is selected, and is only limited by the claims and their equivalents.
Embodiment 1：
Fig. 1 schematically illustrates the basic block diagram of the gas remote measurement device of the embodiment of the present invention, as shown in Figure 1, institute
Stating gas remote measurement device includes：
Light source, such as laser, wavelength covering the under test gas such as methane, gas of the measurement light that an only light source is sent out
The absorption line of gas known to concentration in pond；
Reflectance coating is plated in beam splitting device, the subregion on the plane of incidence such as semi-transparent semi-reflecting lens, on convergent lens, described point
Beam device is used to the measurement light separating the first light beam and the second light beam, and first light beam passes through region to be measured；
Light deflection module, such as the transmission device with the angle of wedge between light incident surface and light-emitting face, the smooth deflection module is used
In the direction of travel for changing the first light beam；
Gas cell, second light beam pass through the gas cell, the gas cell to accommodate gas, such as concentration known to concentration
Known under test gas substitutes gas；
First detector, first detector will be for that will pass through first light beam in region to be measured to be converted to the first telecommunications
Number, and it is transmitted to processor；
Second detector, second detector will be for that will pass through the second light beam of the gas cell to be converted to the second telecommunications
Number, and it is transmitted to processor；
Processor, the processor are used to adjust the running parameter of the light source, make the corresponding light of second electric signal
The drift of the wavelength of source output is not exceeded；Angle of inclination for adjusting the smooth deflection module the first incident light beam relatively,
So that the interference between reflected light of corresponding first light beam of the first electric signal on internal reflection body in region to be measured is not exceeded.
In order to detect the content of different floor indoor gas, further, the gas remote measurement device further comprises：
Unmanned plane, such as multi-rotor unmanned aerial vehicle, the light source, the first and second detectors, light deflection module, gas cell installation
On the unmanned plane, unmanned plane flies to different story heights, to detect the content of different floor indoor gas.
In order to reduce the loading capacity of unmanned plane to improve the cruising ability of unmanned plane, further, the processor is arranged
It is interior in monitoring room or monitoring；The electric signal of output is wirelessly transmitted to the place by first and second detector
Manage device.
The gas remote measurement method of the embodiment of the present invention namely the course of work of above-mentioned gas telemetering equipment, the gas are distant
Survey method includes the following steps：
(A1) the measurement light that light source is sent out is divided into the first light beam and the second light beam, and the wavelength covering for measuring light is to be measured
The absorption line of gas known to gas, concentration；
(A2) first light beam passes through light deflection module, injects later in region to be measured, the first detector will be to be measured
The first light beam after gas absorbs is converted to the first electric signal, and is transmitted to processor；
Second light beam passes through gas known to concentration, the second detector that the second light beam of injection is converted to the second electricity
Signal, and it is transmitted to processor；
(A3) processor obtains the drift of the light source output wavelength according to second electric signal, if drift is exceeded,
The running parameter for adjusting the light source enters step (A1)；If not exceeded, enter step (A4)；
Processor is obtained according to first electric signal between reflected light of first light beam on internal reflection body in region to be measured
Interference signal adjusts the angle of inclination of the smooth deflection module the first incident light beam relatively, enters if interference exceeds threshold value
Step (A1)；If non-superthreshold enters step (A4)；
(A4) processor handles first electric signal according to spectral technique, to obtain the content of under test gas.
In order to expand the detection range of gas concentration, optionally, in step (A4), processor selects direct absorption spectrum
Technology (under test gas of processing high concentration) or wavelength modulation spectroscopy (under test gas of processing low concentration) go to handle
First electric signal.
In order to detect the content of different floor indoor gas, further, unmanned plane carries the light source, detector, light
Deflection module, gas cell fly to outdoor, and the light that the light source is sent out is injected indoor.
In order to reduce the loading capacity of unmanned plane to improve the cruising ability of unmanned plane, further, the processor is arranged
It is interior in monitoring room or monitoring；The electric signal of output is wirelessly transmitted to the processor by the detector.
In order to allow owner to grasp indoor safe condition, the security risks such as natural gas leaking, further, institute are found early
Gas remote measurement method is stated to further comprise the steps：
(A5) if the content C of under test gas is not zero, and it is in increasing trend, prompts alarm, and content information is sent to
On the communication terminal of owner.
Embodiment 2：
According to embodiments of the present invention 1 gas remote measurement device and method natural gas leaking in each layer room of residential building detects
In application examples.
In the application examples, it includes 1651nm (corresponding that an only light source, which uses Distributed Feedback Laser, the wavelength for measuring light,
To the absorption line of methane)；Modulation output wavelength is gone by adjusting the driving current and operating temperature of laser；Beam splitting device is adopted
Use semi-transparent semi-reflecting lens；It is collected by window and the light of wall reflection using convergent lens, the light after convergence is received by the first detector；
Gas cell interior sealing has the methane of known concentration；Unmanned plane uses big boundary unmanned plane；Laser, detector and light deflection module,
Gas cell, processor are installed on unmanned plane.
Fig. 2 schematically illustrates the basic block diagram of the light deflection module of the embodiment of the present invention, as shown in Fig. 2, described
Light deflection module includes：
The wedge-shaped transmission device 11 with the angle of wedge is fixed on the side of connector 21 between light incident surface and light-emitting face, described
First light beam passes through the wedge-shaped transmission device；The other side of connector is fixed at least two range adjusters 31,32；At least
The length of two range adjusters (using piezoelectric material) is adjustable, changes by adjusting the voltage being applied on range adjuster
The length of adjuster, the inclined degree so as to adjust the connector relative to the first light beam, namely the first light beam of adjustment are opposite
The incident angle of the light incident surface of wedge-shaped transmission device.
In the course of work of telemetering equipment：
(B1) unmanned plane carries the light source, detector, light deflection module, gas cell and processor and flies to outdoor；
Positioning step：The position for needing adjustment unmanned plane, the suitable inspection positions shooting one outside building layer window
Width template image simultaneously stores；
Unmanned plane climbs certain altitude, this is highly approximately equal to the floor height of building.The height climbed can be controlled by GPS,
Or operator's probably one height of estimation.After unmanned plane hovering, entrained video camera shoots piece image, software extraction
The angle point (angle point grid can be used Harris algorithms or other similar image characteristics extraction algorithms) of window on image, then with
The corner location of window is matched on template image, if angle point is in the position of image and mutual angle, distance and mould
Plate is almost the same (three comparison threshold values can be set, when position, angle and distance are respectively less than given threshold value, it is believed that consistent),
Then successful match, expression positions successfully, into telemetering step.If above- mentioned information differs greatly, illustrate positioning failure.
If positioning failure, attempts rotation unmanned plane or rotate entrained video camera certain angle, again shooting figure
Picture is matched according to above-mentioned matching process with template image, if successful match, then it represents that is positioned successfully, is walked into telemetering
Suddenly.
If still failed after adjusting unmanned plane and video camera posture, the height for adjusting unmanned plane is needed, is risen
Or decline certain distance, it then repeats the above steps, until positioning successfully；
(A1) the measurement light that laser is sent out is divided into the first light beam and the second light beam, and the wavelength for measuring light covers first
The absorption line of alkane；
(A2) first light beam passes through light deflection module, injects interior across glass pane later, and the first detector will
First electric signal is converted to by the first light beam reflected after indoor methane adsorption, and is transmitted to processor；
Second light beam passes through methane known to concentration, the second detector in gas cell to convert the second light beam of injection
For the second electric signal, and it is transmitted to processor；
(A3) processor handles second electric signal, obtains the intensity and first harmonic of methane adsorption second harmonic signal
The ratio of the intensity of signal when being maximum between corresponding wavelength and methane adsorption spectral line deviation (at the absorption line of methane,
The intensity of methane adsorption second harmonic signal and the ratio of the intensity of first harmonic signal are the largest, and have previously been stored in processor
It is interior) to get the drift for the output wavelength for going out the light source, if drift is exceeded, adjust the running parameter of the light source, such as laser
Device operating temperature or operating current enter step (A1)；If not exceeded, enter step (A4)；
Processor obtains the interference signal between reflected light of first light beam on glass pane according to first electric signal, if
Interfere exceeded, then adjusts the angle of inclination of the first relatively incident light beam of the smooth deflection module, enter step (A1)；If not surpassing
Mark, enters step (A4)；
(A4) processor selects direct absorption spectroscopy techniques (methane of processing high concentration) or wavelength modulated optical absorption spectra skill
Art (methane of processing low concentration) goes to handle first electric signal, to obtain the content of indoor methane；
(A5) if the content C of methane is not zero, and it is in increasing trend, prompts alarm, and content information is sent to owner
Communication terminal on.
Embodiment 3：
According to embodiments of the present invention 1 gas remote measurement device and method natural gas leaking in each layer room of residential building detects
In application examples, as different from Example 2：
1. gas cell and the second detector integrate, gas cell interior sealing has replacement gas, the suction of the replacement gas
The absorption line for receiving spectral line and methane is in the output wavelength scanning range of laser, for substituting gas known to the concentration
The ratio of body, the intensity for the second harmonic signal that gas absorbs and the intensity of first harmonic signal is in the absorption line for substituting gas
Place is maximum, which is stored in advance in processor；During telemetering, by analyze the output of the second detector second
When the ratio of electric signal, the intensity for obtaining the absorption second harmonic signal for substituting gas and the intensity of first harmonic signal is maximum
Corresponding wavelength and substitute gas absorption line between deviation to get the output wavelength for going out the light source drift.
2. plating reflectance coating on the subregion of the plane of incidence of light convergent lens so that be incident on the measurement light quilt in the region
Reflection is divided into the first light beam and the second light beam for being reflected by reflectance coating across light convergent lens to measure light.
3. processor is mounted in monitoring car, wireless communication is used with the drive module and detector of the laser.
Above-described embodiment is only that the case where illustratively giving detection interior Methane in Air, can also be certainly other
Gas, such as benzene homologues, formaldehyde, coal gas are toxic, pernicious gas and flammable explosive gas, and those skilled in the art is come
It says, the specific implementation mode of these gas detections, is that need not pay creativeness can obtain on the basis of the above embodiments
's.
Claims (8)
1. gas remote measurement device in room, it is characterised in that：The gas remote measurement device includes：
Light source, gas known to the wavelength covering under test gas of the measurement light that an only light source is sent out, the concentration in gas cell
The absorption line of body；
Beam splitting device, the beam splitting device are used to the measurement light separating the first light beam and the second light beam, first light beam
Across region to be measured；
Light deflection module, the smooth deflection module for changing the first light beam direction of travel；The smooth deflection module includes：
Wedge-shaped transmission device, the wedge shape transmission device are fixed on the side of connector, and first light beam passes through the wedge shape
Transmission device；
The other side of connector, the connector is fixed at least two range adjusters；
The length of at least two range adjusters, at least two range adjusters is adjustable, for adjusting the connector phase
For the inclined degree of the first light beam；
Gas cell, second light beam pass through the gas cell, the gas cell to accommodate gas known to concentration；
First detector, first detector are used to first light beam in region to be measured will be passed through to be converted to the first electric signal, and
It is transmitted to processor；
Second detector, second detector are used to the second light beam of the gas cell will be passed through to be converted to the second electric signal,
And it is transmitted to processor；
Processor, the processor handle second electric signal, obtain the second harmonic signal of the absorption of gas pool gas
Intensity and the ratio of the intensity of first harmonic signal corresponding wavelength when being maximum, and then obtain the wavelength and the gas cell
Deviation between the absorption line of interior gas, if the deviation is exceeded, the processor is used to adjust the running parameter of the light source,
Keep the drift of the corresponding light source of second electric signal not exceeded；The processor enters relatively for adjusting the smooth deflection module
The angle of inclination for the first light beam penetrated so that reflection of corresponding first light beam of the first electric signal on internal reflection body in region to be measured
Interference between light is not exceeded, and the reflector is glass pane.
2. gas remote measurement device according to claim 1, it is characterised in that：The gas remote measurement device further comprises：
Unmanned plane, the light source, the first and second detectors, light deflection module, gas cell are mounted on the unmanned plane.
3. gas remote measurement device according to claim 1, it is characterised in that：The range adjuster uses piezoelectric material.
4. gas remote measurement device according to claim 1, it is characterised in that：Gas and under test gas known to the concentration
It is identical or different gas.
5. gas remote measurement device according to claim 1, it is characterised in that：The light source is laser.
6. gas remote measurement method in room, the gas remote measurement method includes the following steps：
(A1) the measurement light that light source is sent out is divided into the first light beam and the second light beam, and the wavelength for measuring light covers gas to be measured
The absorption line of gas known to body, concentration；
(A2) first light beam passes through light deflection module, injects later in region to be measured, the first detector will be by under test gas
The first light beam after absorption is converted to the first electric signal, and is transmitted to processor；
Second light beam passes through gas known to concentration, the second detector that the second light beam of injection is converted to the second telecommunications
Number, and it is transmitted to processor；
(A3) processor obtains the drift of the light source according to second electric signal, if drift is exceeded, adjusts the light source
Running parameter, enter step (A1)；If not exceeded, enter step (A4)；The acquisition modes of the drift are：The processor
Second electric signal is handled, obtains the intensity and first harmonic of the second harmonic signal of the absorption of gas known to the concentration
The ratio of the intensity of signal corresponding wavelength when being maximum, and then obtain the absorption spectra of the wavelength and gas known to the concentration
Deviation between line；
Processor obtains the interference between reflected light of first light beam on internal reflection body in region to be measured according to first electric signal
Signal adjusts the angle of inclination of the smooth deflection module the first incident light beam relatively, enters step if interference is exceeded
(A1)；If not exceeded, enter step (A4)；The reflector is glass pane；The adjustment mode of the smooth deflection module is：
Length of the adjustment mounted at least two range adjusters of connector side so that be mounted on the connector other side
The inclined degree of wedge-shaped transmission device relative measurement light change, pass through the wedge-shaped transilluminator so as to adjust the first light beam
Deflection angle after part；
(A4) processor handles first electric signal according to spectral technique, to obtain the content of under test gas.
7. gas remote measurement method according to claim 6, it is characterised in that：In step (A4), processor selection is direct
Absorption spectroscopy techniques or wavelength modulation spectroscopy go to handle first electric signal.
8. gas remote measurement method according to claim 6, it is characterised in that：The range adjuster uses piezoelectric material.
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| CN110575083B (en) * | 2018-06-11 | 2022-07-08 | 佛山市顺德区美的电热电器制造有限公司 | Cooking appliance, cooking method, and computer-readable storage medium |
| CN109060665A (en) * | 2018-08-09 | 2018-12-21 | 山东恒晋仪器有限公司 | The device of extending space gas detection range |
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| CN109596564A (en) * | 2018-10-12 | 2019-04-09 | 上海禾赛光电科技有限公司 | A kind of laser control device, array and control method |
| CN109470638B (en) * | 2018-10-31 | 2021-05-07 | 上海禾赛光电科技有限公司 | Laser gas detection device |
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| CN108918441A (en) | 2018-11-30 |
| CN105319173A (en) | 2016-02-10 |
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