Stray radiation multi-level suppression device for laser detection of ammonia-related pipeline leakage
A technology for pipeline leakage and laser detection, applied in the field of photoelectric detection, can solve the problems of effective signal submersion, limited measurement range, accurate detection interference, etc., and achieve the effect of suppressing thermal radiation annoyance
Active Publication Date: 2019-04-02
NORTHEAST GASOLINEEUM UNIV +1
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Problems solved by technology
Due to the limited measurement range of high-precision detection equipment, if the incident amount of stray radiation is too large, the effective signal will be overwhelmed
When performing laser detection on ammonia-related pipeline leaks, the effective signal is often submerged in stray radiation, causing great interference to accurate detection
Method used
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[0017] refer to figure 1 and figure 2 , the accompanying drawings are simplified schematic diagrams to illustrate the basic structure, key components and main uses of the present invention, so the embodiments of the present invention are not limited thereto.
[0018] Such as figure 1 As shown, a stray radiation multi-stage suppression device for laser detection of ammonia-related pipeline leakage, including a primary mirror 1, a primary suppression unit, a secondary suppression unit, a tertiary suppression unit, a detector receiving lens 2, and a detector 3 , a laser collimator 4 and a housing 5; wherein the main mirror 1 and the detector receiving lens 2 both use a Fresnel lens, the primary suppression unit includes a relay lens 6, an aperture stop 7 and a focus adjustment plate 8, and the secondary suppression The unit is composed of three broadband dielectric film mirrors installed according to a specific angle, and the third-level suppression unit is a cold diaphragm 10...
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The invention belongs to the technical field of photoelectric detection, and in particular relates to a stray radiation multi-stage suppression device for laser detection of ammonia-related pipeline leakage. Including the housing, it also includes the primary mirror, the primary suppression unit, the secondary suppression unit, the tertiary suppression unit, the detector receiving lens, the detector and the laser collimator; the primary suppression unit includes the relay lens, the aperture diaphragm and the focus adjustment plate, the secondary suppression unit includes three broadband dielectric film mirrors, and the third-level suppression unit is a cold diaphragm with a halo ring; the primary mirror and laser collimator are located at the left end of the housing, the primary suppression unit is located on the right side of the primary mirror, and the secondary suppression unit is The unit is located on the right side of the primary suppression unit, and the three broadband dielectric film reflectors are respectively located at the right end, bottom end and top end of the housing; the cold diaphragm with a light-blocking ring is located under the third broadband dielectric film reflector. The receiving lens of the detector and the light-sensitive surface of the detector are respectively located at the entrance hole and the exit hole of the cold diaphragm with the light ring.
Description
Technical field: [0001] The invention belongs to the technical field of photoelectric detection, and in particular relates to a stray radiation multi-stage suppression device for laser detection of ammonia-related pipeline leakage. Background technique: [0002] Ammonia gas is a flammable gas and a poisonous substance. It is easily soluble in water under normal temperature and pressure to form ammonia water, and it is easily liquefied into a colorless liquid under pressure. In the ammonia-related refrigeration industry, once the liquid ammonia or gaseous ammonia pipeline leaks, the ammonia concentration (volume fraction) in the air will reach 15.8%-27%, and an explosion will occur if it encounters an open flame. Important means of leakage. [0003] As photodetectors become more responsive, they become more capable of detecting even very faint stray radiation. Due to the limited measurement range of high-precision detection equipment, if the incident amount of stray radiati...
Claims
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IPC IPC(8): G01M3/02G01N21/31
CPCG01M3/02G01N21/31
Inventor 吕妍张国君李栋汪宏何承代韦新华刘延雷梁正廖晓玲
Owner NORTHEAST GASOLINEEUM UNIV