CN1125324C - System and method for detecting leakage by laser imaging - Google Patents
System and method for detecting leakage by laser imaging Download PDFInfo
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- CN1125324C CN1125324C CN 00120955 CN00120955A CN1125324C CN 1125324 C CN1125324 C CN 1125324C CN 00120955 CN00120955 CN 00120955 CN 00120955 A CN00120955 A CN 00120955A CN 1125324 C CN1125324 C CN 1125324C
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Abstract
The present invention relates to a leakage detection method and a device thereof by laser imaging. The leakage detection device comprises a laser device, a gas cylinder filled with detected media, an imaging instrument and a monitor, wherein a detected object is placed in the front of the output light of the laser device; the lens of the imaging instrument is placed towards the detected object, and the imaging instrument and the monitor are electrically connected; the gas cylinder filled with detected media is connected with the detected object through a pipeline. The leakage detection device is used by the leakage detection method which comprises: firstly, the detected media are filled in the detected object; then, the laser device is switched on; under laser radiation, when the detected media is leaked, temperature difference is applied to leaked gas and surrounding environment, and flowing images of the leaked gas are observed on the monitor through the imaging instrument.
Description
The present invention relates to a kind of leak hunting method and device, particularly relate to a kind of laser imaging leak detection system and method that the method that adopts laser imaging is hunted leak to large-scale instrument and equipment
The existing leak hunting method that uses is broadly divided into four classes: pressure detection method, vacuum detecting method, gas detection method and ultrasonic Detection Method, as: list of references [1] Zhang Danhua, Xiao Shengyi translates: " sensor application ", [day] automatic technology editorial office, China Measuring Press, 1992.Wherein the gas detection method is better than other three class methods.In the gas detection method, commonly used have halogen detection method, temperature conductivity detection method and a helium detector etc.The leak detection sensitivity of this four classes leak hunting method is different, and the sensitivity that has is lower, and what have is higher, and the sensitivity of gas detection method all can reach year slip less than 1 gram, and wherein helium leak detector sensitivity is higher.Most widely used in the above-mentioned gas leak detection method is the halogen detection method, and the employed halogen gas sensor construction of halogen detection method as shown in Figure 1.The halogen detection method is that the platinum with heating serves as anodal 7, disposes negative pole 8 in its vicinity, pot 9, and well heater 10, heater power source 11 if form current potential, just has faint electric current to flow.But if there is halogen gas, then positive ion increases, and electric current increases.The halogen gas sensor utilizes this phenomenon to measure.The sensitivity of sensor is determined by gas concentration.Because of gas constantly spreads in air, along with the prolongation of time, sensitivity will descend, so leak detection sensitivity differs greatly according to the difference of using method.The common shortcoming of above-mentioned four class leak hunting methods is: (1). testing staff's labour intensity is big during leak detection, when taking a lot of work, has a strong impact on the progress of whole work.(2). they all can not position leak detection, and especially in multinode leak detection process, above-mentioned four class leak hunting methods are difficult to provide the definite position of leakage.
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, in order to save time, alleviate when leak detection testing staff's labour intensity, increase work efficiency, make that labour intensity leak detection work big and when taking a lot of work becomes easily, labour intensity is little, the hi-tech testing of good economy performance; Secondly, in order accurately to detect the definite position of leakage, improve accuracy of measurement; And further for realize large-area once the leak detection, thereby a kind of leak detection system and method that adopts laser imaging is provided.
The object of the present invention is achieved like this: laser imaging leak detection system provided by the invention comprises the gas cylinder of laser instrument, imager, monitor and measured medium; Wherein detected material is placed in output light the place ahead of laser instrument, imager
The alignment lens detected material is placed, and imager and monitor are electrically connected; Be connected by pipeline between valve on this gas cylinder and the detected material; In the time will detecting a certain equipment and whether leak gas, need detected material is filled with the gas of certain pressure, laser radiation is when detected material is a part of, when measured medium leaks out from detected material, because gas leakage absorbs laser energy, therefore gas leakage and environment on every side have a temperature difference, can clearly observe the image that gas leakage flows by imager on monitor, thereby reach the purpose of leak detection.
Laser imaging leak detection system of the present invention also comprises the one scan instrument, the scanner head of scanner is between laser instrument and measured object, laser instrument output light direct irradiation is on the catoptron of scanner head, the mirror surface of laser beam and scanner head is at 45 ± 5 ° of angles, settle convex lens on the place ahead light path of scanner head mirror reflects output light, convex lens output light is through being scanned into H width direct irradiation on detected material.And,, can also settle one group of concave, convex lens to the light path the catoptron of scanner head from laser instrument output light in order to increase the area of laser radiation; Scanner head both can be placed on the support of adjustable-angle, also can be hand held in.The laser beam of vertical direction diffusion angle generally is designed to ± and 15 °, the maximum spread angle of the laser of horizontal direction can reach ± and 15 °～± 24 °.Like this, measured object is far away more from scanister, and the irradiated area of laser on measured object is just big more.By the appropriate design of scanning light path and the adjusting of scanner head mirror angle, the laser beam that laser leakage detecting equipment is produced expands the large-area coplanar laser illumination of rectangle to, reach the laser radiation effect that the leak point once detects in the large tracts of land of measured object, thereby improve the leak detection work efficiency widely.
Wherein, laser instrument can with kind comprise semiconductor laser, carbon dioxide laser, helium-neon laser and yttrium-aluminum garnet laser etc., kind as the gas of measured medium comprises ammonia, freon, nitrous oxide, sulfur hexafluoride, fluorine carbon nitrogen, methyl alcohol, ethene and chlorinated polyvinyl chloride etc., the kind of imager comprises various video cameras, thermal imaging system etc., and also available general display device of monitor and televisor replace.
Laser leakage detecting method of the present invention is to utilize optical imaging concept, use laser leakage detecting device of the present invention, at first certain gas of open fill is as the switch of the gas cylinder of measured medium, with certain gas filling in detected material as measured medium, open laser instrument then, open imager simultaneously, the switch of monitor, laser radiation is when detected material is a part of, when measured medium leaks out from detected material, because gas leakage absorbs laser energy, therefore gas leakage and environment on every side have a temperature difference, can clearly observe the image that gas leakage flows by imager on monitor, reach the purpose that multinode is accurately located leak detection.As shown in Figure 3, over-emitting black exhaust is exactly the flow image that measured medium leaks.When being equipped with one scan in this device, through the mirror reflects output light of the scanner head convex lens on the light path of the place ahead, convex lens output light is scanned into H width direct irradiation on detected material; Scanner can expand laser irradiation area to certain width and height rectangular area, thereby has enlarged the area of field of detection, has therefore improved work efficiency.
Laser leakage detecting system and method for the present invention is suitable for the aerospace industry of hunting leak, as the leak detection work of systems such as rocket, engine, space shuttle; Be used for light industry, as leak detection work such as air-conditioning, refrigerators; And other need apparatus for sealing, as the leak detection work of various pressure vessels and pipeline etc.; The leak detection work that special gas leaks; Though the concrete object difference of detected material, leak hunting method is identical with step, and therefore laser leakage detecting equipment of the present invention and leak detection process are very simple and convenient.
Advantage of the present invention:
(1) can detect the leakage of multinode simultaneously, can find out the position that multiple spot leaks intuitively and leak intensity by monitor;
(2) laser leakage detecting equipment is easy to use, and testing staff's labour intensity is little, can shorten the leak detection time greatly, accelerates job schedule;
(3) highly sensitive, to year slip less than 1 the gram leakage point, can on monitor, clearly observe.
(4) the present invention is owing to used the scanner head that has governor motion in the laser imaging leak test plant, through the laser irradiation area behind the scanister greater than more than 10 times of former laser beam irradiation area, it is applied in the laser imaging leak detection system, thereby realized the effect that the leak point once detects in the rectangle large tracts of land, be that the saving of labor saves time again, thereby improved the efficient of leak detection work widely.
Below in conjunction with drawings and Examples the present invention is described in detail:
Fig. 1 is a kind of halogen sensor structural representation in the existing leakage detection apparatus.
Fig. 2 is the structural representation of laser imaging leak detection system of the present invention.
Actual detected effect image when measured medium leaked when Fig. 3 was to use method of the present invention to hunt leak, wherein, the flow image the when position of turning black among the figure is exactly the detected gas leakage can clearly be observed on monitor.
Fig. 4 is the structural representation of band scanister in the laser imaging leak detection system of the present invention.
Embodiment 1: the laser imaging leak detection system of making the hydropower machine stator that is used to hunt leak.
This laser imaging leak detection system comprises semiconductor laser 1, common commercially available imager 4, and monitor 5 is filled with the gas cylinder 3 of measured medium freon; Wherein detected material hydropower machine stator 2 places on the light path of output light of laser instrument 1 and settles, the position that imager 4 is settled faces toward detected material hydropower machine stator 2 with the camera lens of imager 4, and imager 4 and monitor 5 (general television set of various brands and various models gets final product) are electrically connected; Be filled with between valve on the gas cylinder 3 of measured medium freon and the detected material hydropower machine stator 2 and connect to form by pipeline.
Embodiment 2: laser imaging leak hunting method of the present invention carries out according to the following step: the laser imaging leak detection system that uses embodiment 1 to make, at first will be filled with the valve switch opens on the gas cylinder 3 of measured medium freon, the tested leak detection medium freon of filling in the detected material hydropower machine stator 2; Open laser instrument 1, laser radiation is when detected material hydropower machine stator 2, when the measured medium freon leakage, the Freon gas that leaks has a temperature difference with environment on every side, in monitor 5, just can be clear that as the chimney smokes flow image by imager 4, and can determine the particular location of leakage exactly, reach the purpose of leak detection.This leak detection process is very simple and convenient, and very directly perceived.
Embodiment 3: make a scanister that is used for the laser imaging leak test plant the simplest by Fig. 4, this device is that two optical lenses in the light path shown in Figure 4 are removed, one commercially available scanner, the scanner head 10 of this scanner has the mechanism of scalable scanner head catoptron 6 angles, optical male lens 7 are placed in it between laser instrument 1 and the detected material 2; Scanner head 10 is placed on the horizontal table, and the maximum angle of its horizontal direction can be adjusted to ± and 15 °～± 24 °.Laser instrument 1 output beam direct irradiation on the catoptron 6 of scanner head 10, catoptron 6 incident angles at 45 of laser beam and scanner head 10, laser beam incident after reflection one convex lens 7, and the light of realizing the horizontal scanning width reenters and is mapped on the detected material 2.Wherein H is the height of process scanner head 10 back laser in vertical spread, and the laser radiation width of its horizontal direction can be realized by the scanner head of adjusting in the scanister as required.
Embodiment 4: the laser imaging leak detection system that is used to the work of hunting leak of making playscript with stage directions invention band scanister by Fig. 4, this system also comprises a commercially available scanner on the basis of embodiment 1, the scanner head 10 of this scanner has the mechanism of scalable scanner head catoptron 6 angles; The scanner head 10 of scanner is placed on the horizontal table, scanner head 10 relies on governor motion to regulate scanner head 10 catoptrons 6 angles, the diffusion of the laser beam of vertical direction highly generally is designed to ± and 15 °, the maximum angle of its horizontal direction can be adjusted to ± and 15 °～± 24 °, like this, measured object 2 is far away more from scanner, and the irradiated area of laser on measured object 2 is just big more; The logical semiconductor laser of one Daepori 1, three optical lenses 8,9,7, light path by Fig. 4 is placed in them between laser instrument 1 and the detected material 2, after laser instrument 1 output light arrives concavees lens 8, through expanding bundle incident one convex lens 9, the light that planoconvex lens 9 focuses on output incides on the catoptron 6 of scanner head 10, light incides another convex lens 7 again through reflection, and the light of convex lens 7 outputs realizes that the horizontal scanning width is radiated at detected material 2.Be the height of process scanner head 10 back laser in vertical spread as the H among Fig. 4, the laser radiation width of its horizontal direction can be realized by the scanner head of adjusting in the scanister as required.
Claims (8)
1, a kind of laser imaging leak detection system, it is characterized in that: comprise laser instrument (1), be filled with gas cylinder (3), imager (4) and the monitor (5) of measured medium, wherein detected material (2) places the place ahead of the output light of laser instrument (1), the camera lens that imager (4) is placed in imager (4) faces toward on the position of detected material (2), and imager (4) and monitor (5) are electrically connected by lead; Be communicated with by pipeline between the gas cylinder (3) that is filled with measured medium and the detected material (2).
2, by the described a kind of laser imaging leak detection system of claim 1, it is characterized in that: also comprise the one scan instrument, the scanner head of scanner (10) is positioned between laser instrument (1) and the measured object (2), laser instrument (1) output light direct irradiation is on the catoptron (6) of scanner head (10), the mirror surface of laser beam and scanner head (10) is at 45 ± 5 ° of angles, on the place ahead light path of scanner head catoptron (6) reflection output light, settle convex lens (7), convex lens (7) output light through be scanned into laser at the height vertical irradiation of vertical spread on detected material (2).
3, by the described a kind of laser imaging leak detection system of claim 1, it is characterized in that: the described scanner head (10) that is positioned between laser instrument (1) and the measured object (2) is placed on the support of adjustable-angle.
4, by the described a kind of laser imaging leak detection system of claim 1, it is characterized in that: in the light path of described laser instrument (1) output light direct irradiation on the catoptron (6) of scanner head (10), also comprise and settle one group of concave, convex lens.
5, by the described a kind of laser imaging leak detection system of claim 1, it is characterized in that: said laser instrument (1) comprises semiconductor laser, carbon dioxide laser, helium-neon laser and yttrium-aluminum garnet laser.
6, by the described a kind of laser imaging leak detection system of claim 1, it is characterized in that: the kind of the gas of said measured medium comprises: ammonia, fluorine Lyons, nitrous oxide, sulfur hexafluoride, fluorine carbon nitrogen, methyl alcohol, ethene and chlorinated polyvinyl chloride.
7, a kind of laser imaging leak hunting method, it is characterized in that: the switch of at first opening the gas cylinder (3) that is filled with measured medium, with the gas filling in the gas cylinder in detected material (2) as measured medium, open laser instrument then, open the switch of imager (4), monitor (5) simultaneously, laser radiation is when certain part of detected material (2), by imager (4) imaging, monitor (5) presents the image that gas leakage flows after going up and observing gas leakage and environment on every side that a temperature difference is arranged then.
8. laser imaging leak hunting method, it is characterized in that: the switch of at first opening the gas cylinder (3) that is filled with measured medium, with the gas filling in the gas cylinder in detected material (2) as measured medium, open laser instrument then, open imager (4) simultaneously, the switch of monitor (5), laser instrument output light direct irradiation is on the catoptron of scanner head, the mirror surface of laser beam and scanner head is at 45 ± 5 ° of angles, on the place ahead light path of scanner head mirror reflects output light, settle convex lens, convex lens output light through be scanned into laser at the height direct irradiation of vertical spread on detected material, by imager (4) imaging, monitor (5) presents the image that gas leakage flows after going up and observing gas leakage and environment on every side that a temperature difference is arranged then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00120955 CN1125324C (en) | 1999-08-02 | 2000-08-02 | System and method for detecting leakage by laser imaging |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99111220.2 | 1999-08-02 | ||
| CN99111221.0 | 1999-08-02 | ||
| CN99111221 | 1999-08-02 | ||
| CN99111220 | 1999-08-02 | ||
| CN 00120955 CN1125324C (en) | 1999-08-02 | 2000-08-02 | System and method for detecting leakage by laser imaging |
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| Publication Number | Publication Date |
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| CN1291717A CN1291717A (en) | 2001-04-18 |
| CN1125324C true CN1125324C (en) | 2003-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 00120955 Expired - Fee Related CN1125324C (en) | 1999-08-02 | 2000-08-02 | System and method for detecting leakage by laser imaging |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI403701B (en) * | 2010-04-30 | 2013-08-01 | Quanta Comp Inc | Electronic equipment having laser component and capability of inspecting leak of laser and inspecting method for inspecting leak of laser thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100510673C (en) * | 2005-07-30 | 2009-07-08 | 中国科学院安徽光学精密机械研究所 | Laser remote sensing delecting device for natural gas pipe line leakage and detection method thereof |
| CN104386531A (en) * | 2014-11-20 | 2015-03-04 | 东莞三联热缩材料有限公司 | Circular hose packaging machine |
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2000
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI403701B (en) * | 2010-04-30 | 2013-08-01 | Quanta Comp Inc | Electronic equipment having laser component and capability of inspecting leak of laser and inspecting method for inspecting leak of laser thereof |
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| CN1291717A (en) | 2001-04-18 |
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