CN105548041A - Device and method for detecting gas leakage - Google Patents
Device and method for detecting gas leakage Download PDFInfo
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- CN105548041A CN105548041A CN201510903121.1A CN201510903121A CN105548041A CN 105548041 A CN105548041 A CN 105548041A CN 201510903121 A CN201510903121 A CN 201510903121A CN 105548041 A CN105548041 A CN 105548041A
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- G—PHYSICS
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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
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Abstract
The invention discloses a device and method for detecting gas leakage. The device comprises: a light source, which emits measuring light, the length of which overlays a length corresponding to an absorption spectrum of to-be-detected gas; an emergence unit, through which the measuring light passes and is emitted into a to-be-detected area; a reception unit, which is used for collecting detection light formed through interaction of the measuring light and the to-be-detected gas in the to-be-detected area; an area array detector, on which the detection light, corresponding to each point on a to-be-detected face in the to-be-detected area, passes through the reception unit, and is imaged to output an electrical signal which is sent to an analytical unit; an adjusting unit, which is used for changing an optical focal length of the reception unit and allows the detection light of different to-be-detected faces in the to-be-detected area to be imaged on the area array detector; and the analytical unit, which is used for processing a received light signal corresponding to the different to-be-detected faces in the to-be-detected area based on spectral analysis technique in order to obtain column concentrations of the to-be-detected gas corresponding to points on the to-be-detected faces. The device and method are accurate in detection and are powerful.
Description
Technical field
The present invention relates to gas detect, particularly relate to pick-up unit and the method for Leakage Gas.
Background technology
It is breakneck that toxic gas leaks, and when occurring to leak, only finds leakage point accurately, could implement effective reparation, as hole is leaked in shutoff.Traditional leak detection mode is: be coated in suspicious leak position by whether having bubble to judge leakage point with leak detection liquid.At present, the use based on the air-leakage detector of gas infrared absorption principle is comparatively general.Along with the development of infrared imagery technique, Leakage Gas IR Thermograph with its high-level efficiency, at a distance, on a large scale, the dynamic significant advantage such as directly perceived, become the technology that Leakage inspection field is paid close attention to gradually.Leakage Gas IR Thermograph has several types:
The first, adopt (active or passive type) broadband light source, light source light spectrum covers the infrared absorption wave band of tested gas, Caustic method detector receives infrared beam, by contrasting the size of infrared intensity, determine whether in light path, there is tested gas absorption, and reconstruct the leakage image of gas by data processing.The interference of this broadband Leakage Gas IR Thermograph is large, and easily by the interference of other gas infrared absorption, the thermal-radiating impact of scenery, causes Leakage inspection false alarm.
The second, adopt monochromatic laser light source, optical maser wavelength is positioned at the centre wavelength of the infrared absorption peak of tested gas, and light beam irradiation is to region to be detected, and light beam is scattered or is reflected back collection optical system, and luminous energy is received and imaging by infrared imaging detector.Having tested gas leakage to appear at camera watch region, the laser intensity of return laser light detection system weakens due to the absorption through air mass, and the video image leaking air mass region produces changes in contrast.
The third, the laser beam of two wavelength launched by Leakage Gas image checking instrument, and wherein beam of laser wavelength is positioned at the centre wavelength at tested gas absorption peak, and another bundle optical maser wavelength is positioned at the wavelength place not having tested gas absorption.This two bundles laser beam is utilized to carry out detecting leakage gas through the light intensity difference after leakage region, and imaging on infrared imaging detector.
Second and third kind of Leakage Gas imaging detecting instrument have employed monochromatic laser light source, interference-free during imaging, but because detection limit concentration is high, small leakage or the lower pipe leakage of tested gas concentration are difficult to be 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 pick-up unit detecting accurate, multi-functional Leakage Gas.
Goal of the invention of the present invention is achieved by the following technical programs:
A pick-up unit for Leakage Gas, the pick-up unit of described Leakage Gas comprises:
Light source, the wavelength of the measurement light that described light source sends covers wavelength corresponding to the absorption line of gas to be detected;
Outgoing unit, described measurement light is injected in region to be measured after described outgoing unit;
Receiving element, the detection light after described receiving element interacts for the gas to be detected collected in described measurement light and described region to be measured;
Planar array detector, the detection light corresponding with each point on the tested surface in described region to be measured is imaged on described planar array detector after described receiving element, and the electric signal of output send analytic unit;
Regulon, described regulon, for changing the optical focal length of receiving element, makes detection photoimaging that on the different tested surfaces in described region to be measured, each point is corresponding on described planar array detector;
Analytic unit, the light signal corresponding from the different tested surfaces in described region to be measured that described analytic unit receives according to spectral analysis technique process, obtains the post concentration of the to be detected gas corresponding with each point on described tested surface.
According to the pick-up unit of above-mentioned Leakage Gas, preferably, described light source is laser instrument.
According to the pick-up unit of above-mentioned Leakage Gas, preferably, described outgoing unit adopts light to expand device or light reflection device, and described receiving element adopts optical concentrator part.
The present invention also aims to the detection method providing a kind of accurate, multi-functional Leakage Gas, this goal of the invention is achieved by the following technical programs:
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 the wavelength of described measurement light covers wavelength corresponding to the absorption line of gas to be detected;
(A2) gas to be detected in described measurement light and described region to be measured interacts;
(A3) the detection light after the gas to be detected collected in described measurement light and described region to be measured interacts;
(A4) corresponding with each point on the tested surface in described region to be measured detection light is imaged on planar array detector after collecting, and the electric signal of output send analytic unit;
(A5) electric signal corresponding from the different tested surfaces in described region to be measured that receive according to spectral analysis technique process of analytic unit, thus obtain the post concentration of the to be detected gas corresponding with each point on described tested surface;
(A6) change the optical focal length of receiving element, enter 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 electric signal described in lock-in amplify, knows the post concentration of gas to be detected by calculating the business of second harmonic and odd harmonic amplitude.
According to the detection method of above-mentioned Leakage Gas, preferably, in step (A6), change the optical focal length of receiving element, 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 reciprocates in the front and back of planar array detector.
According to the detection method of above-mentioned Leakage Gas, preferably, described light source is laser instrument, modulates described laser instrument, makes the wavelength that the absorption line of the described gas to be detected of the wavelength of described measurement light covering is corresponding.
Compared with prior art, the present invention has following beneficial effect:
1. technology of the present invention has extremely low detection limit, and measurement sensistivity is high, can measure the Leakage Gas of trace;
2. technology of the present invention can the tested region of large-area covering, leakage air mass is become space image on a display screen according to the gradient of concentration, obtains the CONCENTRATION DISTRIBUTION of gas to be measured in region to be measured; Be convenient to user accurate when the detecting of leakage point, efficient;
3. technology of the present invention is not by the cross jamming of background gas, and measurement accuracy is high.
Accompanying drawing explanation
With reference to accompanying drawing, disclosure of the present invention will be easier to understand.Those skilled in the art it is easily understood that: these accompanying drawings only for illustrating technical scheme of the present invention, and and are not intended to be construed as limiting protection scope of the present invention.In figure:
Fig. 1 is the basic block diagram of the pick-up unit of the Leakage Gas of the embodiment of the present invention.
Embodiment
Fig. 1 and following description describe Alternate embodiments of the present invention and how to implement to instruct those skilled in the art and to reproduce the present invention.In order to instruct technical solution of the present invention, simplifying or having eliminated some conventional aspects.Those skilled in the art should understand that the modification that is derived from these embodiments or replace will within the scope of the invention.Those skilled in the art should understand that following characteristics can combine to form multiple modification of the present invention in every way.Thus, the present invention is not limited to following Alternate embodiments, and only by claim and their equivalents.
Embodiment 1:
Fig. 1 schematically illustrates the structural drawing of the pick-up unit of the Leakage Gas of the embodiment of the present invention, and as shown in Figure 1, described pick-up unit comprises:
Light source, as semiconductor laser, the wavelength of the measurement light that described light source sends covers wavelength corresponding to the absorption line of gas to be detected (as methane);
Outgoing unit, described measurement light expands through light to be injected in region to be measured after device or light reflection device (as convex reflecting mirror) outgoing unit;
Receiving element, the detection light after described receiving element interacts for the gas to be detected collected in described measurement light and described region to be measured; Receiving element can adopt has imaging function and the lens combination etc. of focus adjustable, and this lens combination is prior art, does not repeat them here;
Planar array detector, the detection light corresponding with each point on the tested surface in described region to be measured is imaged on described planar array detector after described receiving element, and the electric signal of output send analytic unit; Described planar array detector can adopt surface array charge-coupled detector, face battle array complementary metal oxide semiconductor (CMOS) detector, face battle array thermopile detector or face battle array thermocouple probe;
Regulon, described regulon, for changing the optical focal length of receiving element, makes detection photoimaging that on the different tested surfaces in described region to be measured, each point is corresponding on described planar array detector;
Analytic unit, the light signal corresponding from the different tested surfaces in described region to be measured that described analytic unit receives according to spectral analysis technique process, thus obtain the post concentration of the to be detected gas corresponding with each point on described tested surface, be also the CONCENTRATION DISTRIBUTION of gas to be measured in region to be measured.
The detection method of the Leakage Gas of the embodiment of the present invention, be also the course of work of above-mentioned detection device, 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 the wavelength of described measurement light covers wavelength corresponding to the absorption line of gas to be detected;
(A2) gas to be detected in described measurement light and described region to be measured interacts, as measure light by as described in gas-selectively to be detected absorb or scattering;
(A3) the detection light after the gas to be detected collected in described measurement light and described region to be measured interacts;
(A4) corresponding with each point on the tested surface in described region to be measured detection light is imaged on planar array detector after collecting, and the electric signal of output send analytic unit;
(A5) electric signal corresponding from the different tested surfaces in described region to be measured that receive according to spectral analysis technique process of analytic unit, obtaining the post concentration of the to be detected gas corresponding with each point on described tested surface, is also the CONCENTRATION DISTRIBUTION of gas to be measured in region to be measured:
If post concentration is greater than zero, shows that region to be measured has gas to be detected, leak;
If post concentration equals zero, show not leak.
In order to obtain described post concentration quickly and accurately, further, the acquisition pattern of described post concentration is:
Analytic unit obtains even-order harmonic and odd harmonic by electric signal described in lock-in amplify, knows the post concentration of gas to be detected by calculating the business of even-order harmonic and odd harmonic amplitude;
(A6) change the optical focal length of receiving element, enter step (A4);
The post concentration of the gas to be measured that each point is corresponding on different tested surface in region to be measured can be obtained by the way.
In order to obtain the post concentration of the gas to be detected that each point is corresponding on each tested surface in region to be measured, further, in step (A6), changing the optical focal length of receiving element, the focus of receiving element is moved on optical axis.The focus of described receiving element reciprocates in the front and back of planar array detector.
Embodiment 2:
According to pick-up unit and the application examples of method in pipeline in natural gas leaking detection of the Leakage Gas of the embodiment of the present invention 1.
In this application examples, light source adopts semiconductor laser, and the measurement optical wavelength of launching corresponds to the absorption line of methane; Concavees lens, as transmitter unit, expand for measuring light; There is imaging function and the lens combination of focus adjustable as receiving element, make detection photoimaging that in region to be measured, in detection faces, each point is corresponding on two-dimensional array detector; Adopt ultrasonic motor to go to change the optical focal length of lens combination, the focus of receiving element is moved around in the front and back of planar array detector, thus make detection photoimaging that in region to be measured, on different tested surface, each point is corresponding on planar array detector; The electric signal that planar array detector exports obtains second harmonic and first harmonic signal after lock-in amplify, utilizes second harmonic and the business of first harmonic signal to obtain the post concentration of methane corresponding to described each point.
Claims (8)
1. a pick-up unit for Leakage Gas, is characterized in that: the pick-up unit of described Leakage Gas comprises:
Light source, the wavelength of the measurement light that described light source sends covers wavelength corresponding to the absorption line of gas to be detected;
Outgoing unit, described measurement light is injected in region to be measured after described outgoing unit;
Receiving element, the detection light after described receiving element interacts for the gas to be detected collected in described measurement light and described region to be measured;
Planar array detector, the detection light corresponding with each point on the tested surface in described region to be measured is imaged on described planar array detector after described receiving element, and the electric signal of output send analytic unit;
Regulon, described regulon, for changing the optical focal length of described receiving element, makes detection photoimaging that on the different tested surfaces in described region to be measured, each point is corresponding on described planar array detector;
Analytic unit, the light signal corresponding from the different tested surfaces in described region to be measured that described analytic unit receives according to spectral analysis technique process, obtains the post concentration of the to be detected gas corresponding with each point on described tested surface.
2. the pick-up unit of Leakage Gas according to claim 1, is characterized in that: described light source is laser instrument.
3. the pick-up unit of Leakage Gas according to claim 1, is characterized in that: described outgoing unit adopts light to expand device or light reflection device, and described receiving element adopts optical concentrator part.
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 the wavelength of described measurement light covers wavelength corresponding to the absorption line of gas to be detected;
(A2) gas to be detected in described measurement light and described region to be measured interacts;
(A3) the detection light after the gas to be detected collected in described measurement light and described region to be measured interacts;
(A4) corresponding with each point on the tested surface in described region to be measured detection light is imaged on planar array detector after collecting, and the electric signal of output send analytic unit;
(A5) electric signal corresponding from the different tested surfaces in described region to be measured that receive according to spectral analysis technique process of analytic unit, thus obtain the post concentration of the to be detected gas corresponding with each point on described tested surface;
(A6) change the optical focal length of receiving element, enter step (A4).
5. the detection method of Leakage Gas according to claim 4, is characterized in that: the acquisition pattern of described post concentration is:
Analytic unit obtains even-order harmonic and odd harmonic by electric signal described in lock-in amplify, knows the post concentration of gas to be detected by calculating the business of even-order harmonic and odd harmonic amplitude.
6. the detection method of Leakage Gas according to claim 4, is characterized in that: in step (A6), changes the optical focal length of receiving element, the focus of receiving element is moved on optical axis.
7. the detection method of Leakage Gas according to claim 6, is characterized in that: the focus of described receiving element reciprocates 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 is laser instrument, modulates described laser instrument, makes the wavelength that the absorption line of the described gas to be detected of the wavelength of described measurement light covering is corresponding.
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Cited By (2)
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| CN111610189A (en) * | 2020-07-03 | 2020-09-01 | 福州大学 | Optical calibration system and method for concentration of multi-component gas |
| CN114017687A (en) * | 2021-12-14 | 2022-02-08 | 合肥航谱时代科技有限公司 | Chemical gas leakage detection device |
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| CN114017687A (en) * | 2021-12-14 | 2022-02-08 | 合肥航谱时代科技有限公司 | Chemical gas leakage detection device |
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