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An Optical Distance Measuring Instrument
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1973
Year
EngineeringModulated Light BeamMeasurementCalibrationLength MetrologyOptical TestingOptical MetrologyEducationTime MetrologyOptical MeasurementFiber OpticsQuality MetricsInstrumentationOptical SystemsOptical System AnalysisDigital ReadoutMeasurement SystemTransit Time
This paper describes an instrument that measures the transit time of a modulated light beam out and back over the path whose length is required. The instrument has a digital readout and an rms (1σ) accuracy of ±0.08 mm on a single measurement over ranges up to 60 m. The measurement time is 2.7 sec.