Improvement of the phase measurement of an optoelectronic rangefinder with double referent mixing technique

Karolj Skala

doi:10.1117/12.221109

21 September 1995 Improvement of the phase measurement of an optoelectronic rangefinder with double referent mixing technique

Karolj Skala

Author Affiliations +

Proceedings Volume 2509, Smart Structures: Optical Instrumentation and Sensing Systems; (1995) https://doi.org/10.1117/12.221109
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

Abstract

The analysis of realisibility and feasibility of small, lightweight noncoherent infrared LED rangefinder for mass application as a distance telemeter system for moving traffic objects are given. The proposed short-range rangefinder, suitable for measuring distances from fixed and moving objects, in the range from 1 m to 20 m, with significantly increased accuracy is presented in the paper. These measuring methods, with double referent mixing technique, improves the distance resolution when the phase measurement principle is applied. A phase difference still detectable is +/- 1/4, at symmetrically double frequency conversion from 0.5 MHz to 100 Hz, and enables distance resolution +/- 0.1 m. The detection process is completely independent of the signal amplitude. That means that the reflectivity of target does not disturb the distance measurement results. The possible applications are in traffic control and traffic safety systems as a proximity switch in contest of alarm systems. This paper describes the optimum characteristics of the rangefinder regarding the cost/performance parameter. The description of the method with analytical analysis and the results of experimental realization are also given. The discussion is presented as the experimental support of theoretical analysis.

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Karolj Skala "Improvement of the phase measurement of an optoelectronic rangefinder with double referent mixing technique", Proc. SPIE 2509, Smart Structures: Optical Instrumentation and Sensing Systems, (21 September 1995); https://doi.org/10.1117/12.221109

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