Laser angle measuring system based on four-quadrant photoelectric detector

Abstract

The invention discloses a laser angle measuring system which comprises a laser emitter and a four-quadrant photoelectric detector. The four-quadrant photoelectric detector comprises four photovoltaicdevices, a light shading sheet and an outer cavity. The four photovoltaic devices are distributed according to a rectangular coordinate system, and a gap between adjacent photovoltaic devices is a coordinate axis of the rectangular coordinate system. The light shading sheet is located in a gap between the adjacent photovoltaic devices to isolate the adjacent photovoltaic devices, and a side wall of the light shading sheet is perpendicular to surfaces of the light receiving sides of the photovoltaic devices. When an incident angle of input light is changed, a shadow area is formed on surfaces of the photovoltaic devices, the area of the shadow area is corresponding to the incident angle of the light, and the magnitude of the current generated by the photovoltaic devices also is corresponding to the area of the shadow area. The angle of the incident light can be finally calculated by detecting the current, and the deflection angle of the incident light can be measured.

Description

technical field [0001] The invention relates to the technical field of laser detection, in particular to a laser angle measurement system based on a four-quadrant photodetector. Background technique [0002] The four-quadrant photodetector is one of the three commonly used detectors in optical tracking. Because of its high detection sensitivity, the four-quadrant photodetector is widely used in tracking, guidance, positioning, collimation, and space satellite optical communication capture. Pointing and tracking technology (APT), position detection of the cantilever of modern atomic force microscopes (AFMs), etc.; as a measurement component, four-quadrant photodetectors are also used in laser optical systems such as scanning probe microscopes, optical tweezers, and space optical communications. With a large number of applications. [0003] The four-quadrant detector consists of four photodiodes that are independent of each other and have the same performance. The four photod...

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Problems solved by technology

[0004] However, in the prior art, the four-quadrant detector can only respond to the translation of the object, and when the object rotates, that is, when the incident angle of the light irradiating the four-quadrant detector changes, the four-quadrant detector usually cannot respond to it

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