Sectional type distance compensation method for range finding sensor
A technology of ranging sensor and compensation method, applied in the field of sensors, can solve the problems of inability to meet the linearity difference of sensors, low accuracy and linearity, low curve fitting degree, etc., and achieves easy production automation, remarkable linearity and precision. , the effect of strong scalability
Inactive Publication Date: 2018-08-03
SHANGHAI LANBAO SENSING TECH
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Problems solved by technology
Using only a single type of compensation fitting formula cannot satisfy the linearity difference between sensors
[0005] Most ranging sensors have average linearity, using linear fitting or quadratic fitting, the degree of fitting to the curve is not high, and the accuracy and linearity after compensation are not high
[0006] Fitting with high-order terms or other fitting curves (such as exponential, logarithmic, etc.), although it may have a higher degree of fitting, but the calculation is large and error-prone
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[0037] The following is a detailed description of the embodiments of the present invention. This embodiment is carried out based on the technical solution of the present invention, and provides detailed implementation methods and specific operation processes.
[0038] figure 1 It is a flow chart of a segmented distance compensation method for a distance measuring sensor in the present invention.
[0039] Taking the ranging product with a distance range of 100-2500mm as an example, use the distance measuring sensor to be compensated to test the distance at several calibration points, and get the actual distance and test distance of several points. The actual distance is the calibration point at the target. The value of , the difference between the test distance and the actual distance is the deviation value,
[0040] Establish the coordinate axis, the abscissa is the actual distance, the ordinate is the deviation value, and draw the coordinate distribution diagram of several p...
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The invention provides a sectional type distance compensation method for a for range finding sensor. The method comprises the following steps that the range finding sensor to be compensated tests distances of multiple index points, practical and test distances are obtained, a difference between the test distance and the practical distance serves as a discrepancy, and a coordinate distribution mapof the multiple points is drafted; the multiple points are connected successively to obtain a curve, the curve is divided into multiple sections according to the change trend, and each section of curve approaches a line; a host computer collects the test distance in each compensation point of the range finding sensor, a discrepancy is calculated, and compensation commands of the compensation points are generated and distributed to the range finding sensor; after receiving the compensation commands, the range finding sensor extracts distance information, and carries out calculation for each section via a linear compensation formula; and sectional type distance compensation is carried out on the range finding sensor. Distance compensation is realized via a sectional type linear fitting of the curve, the computational complexity is low, the fitting degree is high, and after compensation, the precision and linearity of the sensor are improved greatly.
Description
technical field [0001] The invention relates to the field of sensors, in particular to a segmented distance compensation method for distance measuring sensors. Background technique [0002] In recent years, the development of ranging sensors has advanced by leaps and bounds, and the demand for high-precision sensors is also increasing. However, relying on the sensitive components of the sensor itself, the accuracy and linearity often fail to meet the expected requirements. Therefore, it is necessary to correct and compensate the measurement results. [0003] At present, there are many compensation methods for distance measuring sensors, most of which are to take multiple measurement points, measure the distance value at the measurement point, draw a correlation curve in combination with the real distance, and perform fitting according to the curve. The general fitting methods include linear fitting, quadratic fitting, higher-order fitting, or other curve fitting methods. ...
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CPCG01D3/028
Inventor 许永童
Owner SHANGHAI LANBAO SENSING TECH