关键词: 激光三角法, 精度, 标定, 参数辨识

Abstract:

A new type of small diameter pipe detection system is designed to improve precision of detection system for oilpipe internal coating thickness. The optical model is established based on the direct laser triangulation principle with its parameters optimized through MATLAB. The calibration experiment of the sensor is carried out and the data are processed by binarization. The parameter b, the most important effect on sensitivity of optical system, is corrected based on parameter identification. The actual value of the parameter b is 33.88 mm. A second calibration experiment is carried out, and its results indicate that using the identified b improves the measuring precision at the range of ±0.02mm, which meets the measuring requirement. The measuring precision by this calibration method based on parameter identification improves one order of magnitude over those by the traditional calibration method.

Key words: laser triangulation, precision, calibration, parameter identification