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SHORT RANGE DISTANCE MEASUREMENT BY ELECTRO‐MAGNETIC PHASE COMPARISON TECHNIQUE*
- Source: Geophysical Prospecting, Volume 25, Issue 2, Apr 1977, p. 269 - 279
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- 27 Apr 2006
Abstract
Abstract
The contribution of electromagnetic phase comparison techniques to distance measuring is reviewed in an historical context. Special emphasis is accorded the new class of near infra‐red electro‐optic instruments suited to the measurement of distances under 2 km with an accuracy of a few millimetres. Principles of operation, sources of error, and practical applications are discussed.