Spatial filtering speed-measuring sensor device and method for improving speed measurement accuracy

Abstract

The invention discloses a spatial filtering speed-measuring sensor device and a method for improving speed measurement accuracy. The device comprises a lighting source, a gathering lens, an image sensor, a data collector, a central processor, a laser displacement sensor, a data output interface and the like. According to the method, the frequency of power peak points of collected image spectrums is used during calculation of movement speeds of object surface particles; in consideration of contribution of other power magnitude points and other frequency points to the frequency caused by a movement target, the movement speeds of the object surface particles are solved by a logarithm weighted average algorithm; a power threshold is set, and when power values in the collected image spectrums are larger than the threshold, the frequency points take part in calculation of the frequency caused by the movement target; the working height from the movement target is measured by the laser displacement sensor accurately in real time, the measurement speed is corrected according to the height in real time to reduce speed measurement errors caused by different working heights, and the speed measurement accuracy of the spatial filtering speed-measuring sensor device is improved.

Description

technical field [0001] The invention relates to the technical field of space filter speed measurement sensors, in particular to a space filter speed measurement sensor device and a method for improving speed measurement accuracy. Background technique [0002] Since the spatial filter velocity sensor (Spatial Filter Velocimeter, SFV) has the advantages of non-contact measurement, high precision, etc., and has a simple optical and mechanical structure and uses an incoherent light source, it can be used for non-contact measurement of fluid, gas and solid surface velocities. It has been used more and more in many fields in industrial production and scientific research. Both civil and military fields have broad application prospects. It has been widely used in vehicle integrated navigation, steel rolling, printing and other high-speed conveyor belt process measurement fields. . [0003] The spatial filter speed sensor uses the scattered light of the moving object to be modulated...

AI Technical Summary

Problems solved by technology

[0008] When the working distance between the spatial filter speed sensor and the moving target changes, it will cause the object distance in the imaging system of the spatial filter speed sensor to change, which will cause the magnification Q of the coupling lens in the imaging system to change, thus causing the space filter speed sensor Accuracy of speed measurement decreases

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