Abstract
Laser triangulation allows non-contact measurement in the third dimension. Due to the nonlinearities presented in camera and laser sensor, large range distances are quite difficult to measure with high precision. In order to enhance the precision and accuracy of large range measurement based on laser triangulation, we propose a novel scheme composed of four laser emitters, curve fitting subpixel location algorithm for laser center detection, and the linear regression approach based on the Gaussian model for calibration. When an object performs a 100 mm displacement from a closer to a farther point, our system achieved a repeatability up to ±7 µm, an estimated standard deviation of fitting error within 0.0027 mm, an expanded uncertainty of repeatability within 0.13 mm, an average error variation of rotational plane within 0.15 degree and a nonlinearity error within ±0.04% in full scale. Compared to published results, our proposed method shows an enhancement in accuracy. The error is significantly reduced and maintains at the low level for large ranges, which makes this system applicable and suitable for industrial and indoor applications.
Highlights
Non-contact measurements play a vital and inevitable role in the modern life
We repost a non-contact measurement method based on laser triangulation along order to enhance the precision and accuracy of the measurement system based on laser along with the experimental implementation
Laser detection and image processing for parameter extraction triangulation, it is requisite thatdiscussed the detection of laser spot center must results be precise, to meet theIn parameter extraction have been in detail and measurement are presented
Summary
Non-contact measurements play a vital and inevitable role in the modern life. There are different types of measurement systems available; for example, the time of flight (TOF) method presented by Claudio et al [1] is an ultrasonic distance measurement method. Buerkle and Fatikow [3] presented a distance measurement technique based on triangulation principle. Rameshwar [5] presented a piecewise linear calibration method in his paper for height measurement based on laser triangulation, the method allowed successful measurement for large ranges. We adopt laser triangulation principle [6] to achieve large range measurement with high accuracy. 504 we adopt laser triangulation principle [6] to achieve large range measurement with high accuracy. In order to enhance the accuracy of the laser triangulation method, the center detection the spot on the object must be accurate.
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