Common optical path transmitting and receiving device for thermopile detector
A thermopile detector, transmitting and receiving technology, applied in the direction of electric radiation detectors, etc., can solve the problems of low echo receiving efficiency, lack of optical receiving system, and trace gas cannot operate normally, so as to improve the optical receiving rate and improve Detection accuracy, the effect of weakening the maximum irradiance intensity
Active Publication Date: 2019-08-06
PETROCHINA CO LTD +1
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Problems solved by technology
However, the diameter of the photosensitive surface of ordinary thermopile infrared detectors is usually only 10mm, and there is a lack of corresponding optical receiving system. The echo receiving efficiency of thermopile infrared detectors used in infrared detection systems is extremely low, and it cannot work normally in the process of trace gas detection. run
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[0030] It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
[0031] A common optical path transmitting and receiving device for a thermopile detector, comprising a condensing and receiving unit and a laser transmitting unit; the condensing and receiving unit includes a Fresnel lens 1, a multi-stage lens arranged in sequence along the positive direction of the main optical axis 14 The reflector 2, the homogenizing rod 3 and the thermopile detector 8, the multi-level reflector 2 and the homogenizing rod 3 are all cylindrical structures with open ends. The surfaces are all reflective surfaces, and the optical axis of the Fresnel lens 1, the axis of the multi-level reflector 2 and the axis of the homogenizing rod 3 all coincide with ...
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The invention discloses a common optical path transmitting and receiving device for a thermopile detector. The device comprises a laser transmitting unit, a light condensing and receiving unit, a rotating base (11) and a supporting dual-arm (12). The light condensing and receiving unit comprises a Fresnel lens (1), a multi-stage reflector (2) and a light-homogenizing rod (3). The laser transmitting unit comprises a first turning corner (4), a limiting aperture (5) and a second turning corner (6). A laser (7) and a thermopile detector (8) are installed in a transmitting chamber (9) and a receiving chamber (10) and can be disassembled. All modules are assembled by a package housing and corresponding supporting components. According to the device, a refraction-reflection secondary focusing system formed by the Fresnel lens and the multi-stage reflector is used, the optical receiving efficiency of echo light is increased, a common optical path structure mode with beam transmitting and receiving integration is used, the system complexity is greatly reduced, the structure is simple and compact, and the manufacturing cost is low.
Description
technical field [0001] The invention relates to the fields of optical design and infrared detection, in particular to a common optical path transmitting and receiving device for thermopile detectors. Background technique [0002] With the rapid development of the pipeline transportation industry, more and more attention has been paid to the safety of long-distance gas pipelines. Pipeline leakage detection technology is an important guarantee for the safe and stable operation of pipelines. Compared with traditional detection methods, laser detection methods based on near-infrared semiconductor absorption spectroscopy have the advantages of high sensitivity, fast response time, strong selectivity, etc., and can be combined with vehicle or airborne, and are increasingly used in long-distance gas transmission Remote sensing detection of pipeline leaks. [0003] At present, most of the optical receiving systems of laser detectors regard the echo from the distant reflection targe...
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IPC IPC(8): G01J5/28
CPCG01J5/28
Inventor 李栋吴国忠王莉莉刘昌宇庞鑫峰周英明王秋实孟凡斌柏明星
Owner PETROCHINA CO LTD