NDLI: Large scale optical position sensitive detector

Content Provider	IEEE Xplore Digital Library
Author	Gugg, C. O'Leary, P. Harker, M.
Copyright Year	2013
Description	Author affiliation: Dept. Product Eng., Univ. of Leoben, Styria, Austria (Gugg, C.; O'Leary, P.; Harker, M.)
Abstract	This paper presents the development of a large scale optical position sensitive detector. The device is designed for the precise guidance of machines with respect to a reference laser plane in large working areas. The 1D detector has a measurement range of 1 [m] and, with the present implementation, a position measurement standard deviation of s <; ±0.6 [mm] in a 95% confidence interval. With this length it is orders of magnitude larger than all presently available position sensitive detectors. The instrument is based on a multi-camera image processing concept. An aluminum bar serves as the target for the laser. The target's surface is specially prepared to ensure optimal scattering of the laser light. Presently, four cameras with overlapping fields of view are deployed to observe the scattered light. Additional optical components reduce the susceptibility to extraneous light sources. Each camera is calibrated using Gram polynomials and the data from the four cameras is fused to give a consistent measurement over the complete measurement range. The linear nature of the computation's algebraic framework offers the advantage that the error propagation can be computed analytically. Weighted polynomial approximation determines the calibration coefficients and weighted polynomial interpolation is used to determine the measurement results. Complete testing of the instrument is presented, whereby cross validation ensures the correct determination of errors. A Kolmogorov-Smirnov test is performed to determine the statistical nature of the measurement errors.
Sponsorship	IEEE Instrum. Meas. Soc.
Starting Page	1775
Ending Page	1780
File Size	12533318
Page Count	6
File Format	PDF
ISBN	9781467346214
ISSN	10915281
e-ISBN	9781467346238
DOI	10.1109/I2MTC.2013.6555720
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Measurement by laser beam Cameras Polynomials Approximation methods Lasers Adaptive optics Calibration
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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