Stray radiation multistage inhibition device used for laser detection ammonia involving pipeline leakage
A pipeline leakage and laser detection technology, applied in the field of photoelectric detection, can solve the problems of effective signal flooding, accurate detection interference, limited measurement range, etc., and achieve the effect of suppressing thermal radiation disturbance
Active Publication Date: 2018-03-23
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] like 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 wi...
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The invention belongs to the technical field of photoelectric detector and particularly relates to a stray radiation multistage inhibition device used for a laser detection ammonia involving pipelineleakage. The device comprises a housing body, a main mirror, a primary inhibition unit, a secondary inhibition unit, a tertiary inhibition unit, a detection receiving lens, a detector and a laser collimator. The primary inhibition unit comprises a relay lens, an aperture diaphragm and a focusing adjusting plate. The secondary inhibition unit comprises three wide band medium film reflection mirrors. The tertiary inhibition unit is a cold diaphragm with a light blocking ring. The main mirror and the laser collimator are arranged on the left end of the housing body. The primary inhibition unit isarranged on the right side of the main lens. The secondary inhibition unit is arranged on the right side of the primary inhibition unit. The wide band medium film reflection mirrors are arranged on the right end, the base end and the top end of the housing body. The cold diaphragm with the light blocking ring is arranged under the wide band medium film reflection mirrors. The detection receivinglens and a light sensing face of the detector are arranged at an incidence hole and an emission hole of the cold diaphragm with the light blocking 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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Login to View More 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