Laser space corner correction method based on double phase-sensitive detectors (PSDs)

Abstract

The invention provides a laser space corner correction method based on double phase-sensitive detectors (PSDs), and belongs to the fields of measuring technologies and laser technology application. In the process of measurement, due to the fact that a space corner exists on a plane where a laser beam and a laser receiver are arranged, the space corner needs to be corrected to obtain a laser vertical incidence point coordinate. The laser space corner correction method based on the double PSDs mainly comprises a laser 1, a filtering piece 2, a pentaprism 3, a two-dimension PSD position transducer 4, a lens 5 and a two-dimension PSD position transducer 6. In the process of actual use, the space corner can be corrected by calculating position coordinates of light spots which is irradiated on the two-dimension PSD position transducer 4 and the two-dimension PSD position transducer 6, and then a coordinate of a point which is obtained by laser vertical incidence on the laser receiver.

Description

technical field [0001] The invention relates to a laser space angle correction method based on double PSD, which belongs to the field of measurement technology and laser application. Background technique [0002] When the laser beam is used as a collimated beam, it is usually required that the laser beam is vertically incident on the laser receiving device. However, in actual use, the laser beam generally cannot be irradiated vertically on the laser receiving device. Space angle, the space angle needs to be corrected in the field of high-precision measurement. In the prior art related to the present invention, it is mainly the research on the measurement method of the spatial angle, such as: [0003] "A method for measuring the spatial angle of the light source" [Wang Jiang, Acta Electronics, 11(2011): 2692-2695]. This method uses sensors on different surfaces of the polyhedron to measure the spatial angle of the light source. By establishing an equivalent vector model, Th...

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Problems solved by technology

However, the problem with this method itself is that the laser beam cannot be vertically incident on the PSD, so this method cannot meet the requirements of high-precision measurement.

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