Large-scale linear array photocell spot location tracking sensor and spot location method

Abstract

The invention provides a wide-range linear array photoelectric cell light spot locating and tracking sensor and a light spot locating method thereof. The light spot locating and tracking sensor comprises a photoelectric cell unit, a multi-channel detected signal preprocessing module, an AD conversion module and a computer signal processing system. The photoelectric cell unit is formed by connecting a plurality of rectangular photoelectric cells, and the rectangular photoelectric cells are in mutual electric insulation. The multi-channel detected signal preprocessing module comprises a plurality of preprocessing branch circuit modules and is used for conducting amplification processing on photoelectric cell signals to obtain analog signals. The AD conversion module is connected to the output end of each preprocessing branch circuit module and is used for converting the output analog signals into digital signals. The computer signal processing system is connected to the output end of the AD conversion module, and is used for processing the digital signals which are input in sequence and calculating the position of a light spot. The method includes the steps that the continuous rectangular photoelectric cells covered by the light spot constitute a self-adapting local area two-quadrant coordinate system, so that the position of the light spot in the self-adapting local area two-quadrant coordinate system is obtained, and then the position of the light spot in the coordinate system formed by the photoelectric cell unit is calculated according to the fixed structural parameter of the photoelectric cell unit.

Description

technical field [0001] The invention relates to the technical field of precision measurement and automatic control, in particular to a large-scale linear array photocell light spot positioning tracking sensor and a light spot positioning method. Background technique [0002] Laser has excellent directivity and high brightness. It can be used as a straight line and scanning plane reference. It has been widely used in geodetic surveying and construction engineering as a straight line or horizontal line measurement reference. and flatness benchmarks, and then realize automatic processing according to the laser plane. The most important key technology and equipment in these measurement and control projects are the detection and tracking sensing and control of collimated laser or scanning laser, quantitative and real-time Measure the difference between the plane to be processed and the reference line and the plane to ensure the elevation profile of the plane to be measured, or to...

AI Technical Summary

Problems solved by technology

[0004] As a straightness and flatness measurement and control system, the requirements for photoelectric detection technology are high precision and large range, especially the tracking control on complex working surfaces requires a large dynamic range and range, while the existing detection sensors for positioning The accuracy is up to 0.01mm, which can meet the requirements, but due to the limitation of the size of CCD and PSD chips, the range is 10mm, and the price of the larger scale is very high. In the tracking measurement that requires a large length, multiple line CCDs have to be used. Or PSD splicing, but there are splicing intervals, and it is difficult to uniformly correct the coordinates. Photocells as spot position detection and automatic tracking sensors are far cheaper than CCDs. Only limited to quadrants and spot sizes, it is urgent to develop photoelectric detection and tracking sensors with high precision and a dynamic measurement and tracking range of tens of centimeters

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