CN105588808A - Detection device and method for gas leakage - Google Patents
Detection device and method for gas leakage Download PDFInfo
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- CN105588808A CN105588808A CN201510917320.8A CN201510917320A CN105588808A CN 105588808 A CN105588808 A CN 105588808A CN 201510917320 A CN201510917320 A CN 201510917320A CN 105588808 A CN105588808 A CN 105588808A
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Abstract
The invention discloses a detection device and method for gas leakage. The detection method comprises the steps that measurement light covering an absorption spectrum of gas to be detected is injected into an area to be detected after passing through an emergent unit; a receiving unit collects detection light generated after interaction between measurement light and the gas to be detected; the detection light is imaged on an area array probe after passing through the receiving unit, and output electrical signals are transmitted to an analyzing unit; an adjusting unit changes the optical focal length of the receiving unit, so that the detection light of different faces to be detected in the area to be detected is imaged on the area array probe; the analyzing unit processes received light signals corresponding to the different faces to be detected through a spectral analysis technology, so that column concentration of the to-be-detected gas corresponding to each point on the corresponding face to be detected is obtained; the positions of the faces to be detected in the area to be detected relative to the receiving unit are determined at the moment according to the position of the area array probe relative to the receiving unit, and the size of a gas cluster to be detected and the position of the gas cluster relative to the detection device are obtained. The detection device has the advantages of being accurate in detection, strong in function and the like.
Description
Technical field
The present invention relates to gas and detect, relate in particular to checkout gear and the method for Leakage Gas.
Background technology
It is breakneck that toxic gas leaks, and while occurring to leak, only finds leakage point accurately, could implement effectivelyReparation, as shutoff leak hole. Traditional leak detection mode is: be coated in suspicious leak position with leak detection liquid logicalCross and whether have bubble to judge leakage point. At present, air-leakage detector based on gas infrared absorption principleUse comparatively general. Along with the development of infrared imagery technique, Leakage Gas IR Thermograph is efficient with itRate, at a distance, on a large scale, the dynamic significant advantage such as directly perceived, become gradually Leakage Gas detection field and pay close attention toTechnology. Leakage Gas IR Thermograph has several types:
The first, adopts (active or passive type) broadband light source, and light source light spectrum covers the red of tested gasOuter absorption bands receives infrared beam on focal plane array detector, by the size of contrast infrared intensity,Determine whether to exist tested GAS ABSORPTION in light path, and reconstruct the leakage image of gas by data processing.The interference of this broadband Leakage Gas IR Thermograph is large, is easily subject to the dry of other gas INFRARED ABSORPTIONDisturb, the thermal-radiating impact of scenery, causes Leakage Gas to detect false alarm.
The second, adopts one-wavelength laser light source, and optical maser wavelength is arranged in the cardiac wave of the infrared absorption peak of tested gasLong, light beam irradiates is to region to be detected, and light beam is scattered or is reflected back optics gathering system, light energy quiltInfrared imaging detector receives and imaging. Having tested gas leakage to appear at camera watch region, return laser light detectsThe laser intensity of system is because the absorption through air mass weakens, and the video image that leaks air mass region producesChanges in contrast.
The third, Leakage Gas imaging detecting instrument device is launched the laser beam of two wavelength, wherein beam of laser rippleThe long centre wavelength that is positioned at tested GAS ABSORPTION peak, another bundle optical maser wavelength is positioned at the ripple that there is no tested GAS ABSORPTIONStrong point. Utilize this two bundles laser beam to carry out detecting leakage gas through the light intensity difference after leakage region, and infraredImaging on imaging detector.
Second and third kind of Leakage Gas imaging detecting instrument adopted one-wavelength laser light source, interference-free when imaging, butBe because detection limit concentration is high, the pipe leakage that small leakage or tested gas concentration are lower is difficult toBe detected, even if leakage image detected, because contrast is very little, be difficult to orient leakage point.
Summary of the invention
In order to solve the deficiencies in the prior art, the invention provides a kind of accurate, multi-functional gas that detectsThe checkout gear that body leaks.
Goal of the invention of the present invention is achieved by the following technical programs:
A checkout gear for Leakage Gas, the checkout gear of described Leakage Gas comprises:
Light source, the measurement light wavelength that described light source sends covers the ripple corresponding to absorption line of gas to be detectedLong;
Outgoing unit, described measurement light is injected in region to be measured behind described outgoing unit;
Receiving element, described receiving element is for collecting the gas to be detected in described measurement light and described region to be measuredDetection light after body interacts;
Planar array detector, the detection light corresponding with each point on being tested surface in described region to be measured is through described receptionBehind unit, be imaged on described planar array detector, the signal of telecommunication of output send analytic unit;
Regulon, described regulon, for changing the optical focal length of receiving element, makes in described region to be measuredDifferent being tested surfaces on detection photoimaging corresponding to each point on described planar array detector;
Analytic unit, described analytic unit according to spectral analysis technique, processing receives with described region to be measured inOptical signal corresponding to different being tested surfaces, the post that obtains the to be detected gas corresponding with each point on described being tested surface is denseDegree; And determine that according to the position of the relative receiving element of planar array detector the being tested surface in region to be measured receives relativelyThe position of unit, obtains size, position that gas to be detected is rolled into a ball.
According to the checkout gear of above-mentioned Leakage Gas, preferably, described light source is laser instrument.
According to the checkout gear of above-mentioned Leakage Gas, preferably, described outgoing unit adopt light expand device orLight reflection device, described receiving element adopts optical concentrator part.
The present invention also aims to provide a kind of detection method of accurate, multi-functional Leakage Gas, thisBeing achieved by the following technical programs of improving eyesight:
The detection method of Leakage Gas, the detection method of described Leakage Gas comprises the following steps:
(A1) the measurement light that light source sends is injected in region to be measured, and described measurement light wavelength covers gas to be detectedThe wavelength corresponding to absorption line of body;
(A2) gas to be detected in described measurement light and described region to be measured interacts;
(A3) collect the detection after the gas interaction to be detected in described measurement light and described region to be measuredLight;
(A4) the detection light corresponding with each point on being tested surface in described region to be measured is imaged on face after collectingOn array detector, the signal of telecommunication of output send analytic unit;
(A5) analytic unit that according to spectral analysis technique, processing receives from different treating in described region to be measuredThe signal of telecommunication that survey face is corresponding, thus the post concentration of the to be detected gas corresponding with each point on described being tested surface obtained.
Analytic unit is determined treating in region to be measured this moment according to the position of the relative receiving element of planar array detectorThe position of the relative receiving element of survey face, obtains size, position that gas to be detected is rolled into a ball;
(A6) optical focal length of change receiving element, enters step (A4).
According to the detection method of above-mentioned Leakage Gas, preferably, the acquisition pattern of described post concentration is:
Analytic unit obtains second harmonic and odd harmonic by the described signal of telecommunication of phase-locked amplification, by calculating twoThe business of subharmonic and odd harmonic amplitude and know the post concentration of gas to be detected.
According to the detection method of above-mentioned Leakage Gas, preferably, in step (A6), change receiving elementOptical focal length, the focus of receiving element is moved on optical axis.
According to the detection method of above-mentioned Leakage Gas, preferably, the focus of described receiving element is surveyed in face battle arrayThe front and back of device come and go mobile.
According to the detection method of above-mentioned Leakage Gas, preferably, described light source is laser instrument, modulates described sharpLight device, makes described measurement light wavelength cover the wavelength corresponding to absorption line of described gas to be detected.
Compared with prior art, the present invention has following beneficial effect:
1. technology of the present invention has extremely low detection limit, measure highly sensitive, can measure traceLeakage Gas;
2. technology of the present invention can the tested region of large-area covering, will reveal air mass according to the gradient of concentrationOn display screen, becoming space image, is also spatial form, locus and dense that in region to be measured, gas to be detected is rolled into a ballDegree distributes; Be convenient to user accurate in the time of the detecting of leakage point, efficient;
3. technology of the present invention is not disturbed by the intersection of background gas, and measurement accuracy is high.
Brief description of the drawings
With reference to accompanying drawing, disclosure of the present invention will be easier to understand. Those skilled in the art easily understand: these accompanying drawings are only for illustrating technical scheme of the present invention, and are not intended to of the present inventionProtection domain is construed as limiting. In figure:
Fig. 1 is the basic block diagram of the checkout gear of the Leakage Gas of the embodiment of the present invention.
Detailed description of the invention
Fig. 1 and following declarative description optional embodiment of the present invention with instruction those skilled in the art howImplement and reproduction the present invention. In order to instruct technical solution of the present invention, simplify or omitted some conventional aspects.Those skilled in the art should understand that be derived from these embodiments modification or replace will be in scope of the present inventionIn. Those skilled in the art should understand that following characteristics can combine to form of the present invention many in every wayIndividual modification. Thus, the present invention is not limited to following optional embodiment, and only by claim and theyEquivalent limit.
Embodiment 1:
Fig. 1 has schematically provided the structure chart of the checkout gear of the Leakage Gas of the embodiment of the present invention, as Fig. 1Shown in, described checkout gear comprises:
Light source, as semiconductor laser, the measurement light wavelength that described light source sends cover gas to be detected (asMethane) wavelength corresponding to absorption line;
Outgoing unit, described measurement light expands device or light reflection device (as convex reflecting mirror) outgoing through lightBehind unit, inject in region to be measured;
Receiving element, described receiving element is for collecting the gas to be detected in described measurement light and described region to be measuredDetection light after body interacts; Receiving element can adopt has imaging function and the adjustable set of lenses of focal length etc.,In this, set of lenses is prior art, does not repeat them here;
Planar array detector, the detection light corresponding with each point on being tested surface in described region to be measured is through described receptionBehind unit, be imaged on described planar array detector, the signal of telecommunication of output send analytic unit; Described planar array detector canAdopt surface array charge-coupled detector, face battle array complementary metal oxide semiconductors (CMOS) detector, face battle array thermoelectric pile to surveyDevice or face battle array thermocouple detector;
Regulon, described regulon, for changing the optical focal length of receiving element, makes in described region to be measuredDifferent being tested surfaces on detection photoimaging corresponding to each point on described planar array detector;
Analytic unit, described analytic unit according to spectral analysis technique, processing receives with described region to be measured inOptical signal corresponding to different being tested surfaces, the post that obtains the to be detected gas corresponding with each point on described being tested surface is denseDegree; And determine that according to the position of the relative receiving element of planar array detector the being tested surface in region to be measured receives relativelyThe position of unit, obtains size, position that gas to be detected is rolled into a ball, is also that in region to be measured, gas to be detected is rolled into a ballSpatial form, locus and CONCENTRATION DISTRIBUTION.
The detection method of the Leakage Gas of the embodiment of the present invention, is also the course of work of above-mentioned detection device, described inThe detection method of Leakage Gas comprises the following steps:
(A1) the measurement light that light source sends is injected in region to be measured, and described measurement light wavelength covers gas to be detectedThe wavelength corresponding to absorption line of body;
(A2) gas to be detected in described measurement light and described region to be measured interacts, as measured light by instituteStating gas-selectively to be detected absorbs or scattering;
(A3) collect the detection after the gas interaction to be detected in described measurement light and described region to be measuredLight;
(A4) the detection light corresponding with each point on being tested surface in described region to be measured is imaged on face after collectingOn array detector, the signal of telecommunication of output send analytic unit;
(A5) analytic unit that according to spectral analysis technique, processing receives from different treating in described region to be measuredThe signal of telecommunication that survey face is corresponding, obtains the post concentration of the to be detected gas corresponding with each point on described being tested surface:
If post concentration is greater than zero, show that region to be measured has gas to be detected, leaks;
If post concentration equals zero, show not leak;
Analytic unit is determined treating in region to be measured this moment according to the position of the relative receiving element of planar array detectorThe position of the relative receiving element of survey face, obtains size, position that gas to be detected is rolled into a ball, is also to treat in region to be measuredDetect spatial form, locus and the CONCENTRATION DISTRIBUTION of gas group;
(A6) optical focal length of change receiving element, enters step (A4).
In order to obtain quickly and accurately described post concentration, further, the acquisition pattern of described post concentration is:
Analytic unit obtains even-order harmonic and odd harmonic by the described signal of telecommunication of phase-locked amplification, by calculating idolThe business of subharmonic and odd harmonic amplitude and know the post concentration of gas to be detected.
In order to obtain the post concentration of the gas to be detected that in region to be measured, on each being tested surface, each point is corresponding, furtherGround, in step (A6), changes the optical focal length of receiving element, makes the focus of receiving element at optical axisUpper movement. The focus of described receiving element comes and goes mobile in the front and back of planar array detector.
Embodiment 2:
The natural gas leaking inspection in pipeline according to the checkout gear of the Leakage Gas of the embodiment of the present invention 1 and methodApplication examples in survey.
In this application examples, light source adopts semiconductor laser, and the measurement optical wavelength of launching is corresponding to methaneAbsorption line; Concavees lens, as transmitter unit, expand for measuring light; Have imaging function and focal length adjustableSet of lenses is as receiving element, makes detection photoimaging that in region to be measured, in detection faces, each point is corresponding at two-dimensional surfaceOn array detector; Adopt ultrasonic motor to go to change the optical focal length of set of lenses, make the focus of receiving element at faceThe front and back of array detector move around, thereby make the detection light that in region to be measured, on different being tested surfaces, each point is correspondingBe imaged on planar array detector; The signal of telecommunication of planar array detector output after phase-locked amplification, obtain second harmonic andFirst harmonic signal, utilizes second harmonic and the business of first harmonic signal to obtain the post of the methane that described each point is correspondingConcentration, and determine the being tested surface phase in region to be measured this moment according to the position of the relative receiving element of planar array detectorTo the position of receiving element, obtain the position that the size of methane gas to be detected group is rolled into a ball relative checkout gear with gasPut, and then obtain spatial form, locus and the CONCENTRATION DISTRIBUTION of methane gas group in region to be measured.
Claims (8)
1. a checkout gear for Leakage Gas, is characterized in that: the checkout gear of described Leakage Gas comprises:
Light source, the measurement light wavelength that described light source sends covers the ripple corresponding to absorption line of gas to be detectedLong;
Outgoing unit, described measurement light is injected in region to be measured behind described outgoing unit;
Receiving element, described receiving element is for collecting the gas to be detected in described measurement light and described region to be measuredDetection light after body interacts;
Planar array detector, the detection light corresponding with each point on being tested surface in described region to be measured is through described receptionBehind unit, be imaged on described planar array detector, the signal of telecommunication of output send analytic unit;
Regulon, described regulon, for changing the optical focal length of receiving element, makes in described region to be measuredDifferent being tested surfaces on detection photoimaging corresponding to each point on described planar array detector;
Analytic unit, described analytic unit according to spectral analysis technique, processing receives with described region to be measured inOptical signal corresponding to different being tested surfaces, the post that obtains the to be detected gas corresponding with each point on described being tested surface is denseDegree; And determine that according to the position of the relative receiving element of planar array detector the being tested surface in region to be measured receives relativelyThe position of unit, obtains size, position that gas to be detected is rolled into a ball.
2. the checkout gear of Leakage Gas according to claim 1, is characterized in that: described light source isLaser instrument.
3. the checkout gear of Leakage Gas according to claim 1, is characterized in that: described outgoing listUnit adopts light to expand device or light reflection device, and described receiving element adopts the adjustable set of lenses of focal length.
4. a detection method for Leakage Gas, the detection method of described Leakage Gas comprises the following steps:
(A1) the measurement light that light source sends is injected in region to be measured, and described measurement light wavelength covers gas to be detectedThe wavelength corresponding to absorption line of body;
(A2) gas to be detected in described measurement light and described region to be measured interacts;
(A3) collect the detection after the gas interaction to be detected in described measurement light and described region to be measuredLight;
(A4) the detection light corresponding with each point on being tested surface in described region to be measured is imaged on face after collectingOn array detector, the signal of telecommunication of output send analytic unit;
(A5) analytic unit that according to spectral analysis technique, processing receives from different treating in described region to be measuredThe signal of telecommunication that survey face is corresponding, thus the post concentration of the to be detected gas corresponding with each point on described being tested surface obtained.
Analytic unit is determined treating in region to be measured this moment according to the position of the relative receiving element of planar array detectorThe position of the relative receiving element of survey face, obtains size, position that gas to be detected is rolled into a ball;
(A6) optical focal length of change receiving element, enters step (A4).
5. the detection method of Leakage Gas according to claim 4, is characterized in that: described post concentrationAcquisition pattern be:
Analytic unit obtains even-order harmonic and odd harmonic by the described signal of telecommunication of phase-locked amplification, by calculating idolThe business of subharmonic and odd harmonic amplitude and know the post concentration of gas to be detected.
6. the detection method of Leakage Gas according to claim 4, is characterized in that: at step (A6)In, the optical focal length of change receiving element moves the focus of receiving element on optical axis.
7. the detection method of Leakage Gas according to claim 6, is characterized in that: described reception is singleThe focus of unit comes and goes mobile in the front and back of planar array detector.
8. the detection method of Leakage Gas according to claim 4, is characterized in that: described light source isLaser instrument, modulates described laser instrument, makes described measurement light wavelength cover the absorption line of described gas to be detectedCorresponding wavelength.
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| CN201510917320.8A CN105588808A (en) | 2015-12-10 | 2015-12-10 | Detection device and method for gas leakage |
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Cited By (2)
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| CN112485212A (en) * | 2020-11-18 | 2021-03-12 | 宁波海尔欣光电科技有限公司 | Leakage detection system, method and device and non-transient storage medium |
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Application publication date: 20160518 |