A Geodetic And Survey Infrared Distance Measurement Instrument

Robin H. Hines

doi:10.1117/12.955175

15 November 1976 A Geodetic And Survey Infrared Distance Measurement Instrument

Robin H. Hines

Proceedings Volume 0095, Modern Utilization of Infrared Technology II; (1976) https://doi.org/10.1117/12.955175
Event: 20th Annual Technical Symposium, 1976, San Diego, United States

Abstract

An infrared light emitting diode is amplitude modulated at 15 megahertz. The light is optically collimated and transmitted to a cube corner reflector at the distance to be measured. The return light from the reflector is focused onto an avalanche photodiode. The phase relation between the transmitted and the received light is a direct measure of the fractional part of a wavelength from the instrument to the reflector. Multiple frequencies are used to determine the number of whole wavelengths to the reflector. The composite distance is calculated by an on board logic processor and presented on a liquid crystal display. Error is less than ±1 cm at distances up to 1 kilometer. The instrument is economi-cal, lightweight, and rugged for field use. Overall system operation is explained along with special optical and electronic problems and limitations that were encountered.

Citation Download Citation

Robin H. Hines "A Geodetic And Survey Infrared Distance Measurement Instrument", Proc. SPIE 0095, Modern Utilization of Infrared Technology II, (15 November 1976); https://doi.org/10.1117/12.955175

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