Interferometric range finder and distance measurer - uses two interferometers with measuring and reference reflectors and common laser light source

摘要

Appts. is included for correcting, the measurement result in dependence on the environmental conditions pertaining in the measurement path and independently of the wavelengths. A laser light source is used for two interferometers or a three beam interferometer with reference and measuring reflectors. The inteferometers are connected to an evaluator (18) via a beam splitter (8) following the light source and separate incremented counters (16, 17). The reference reflectors (4, 5) of the interferometers (2, 3) are fixed at a definite spacing on a reference length normal (12) fixed in position on a measuring appts. A measuring work a projection (13, 14) on the normal is assigned to each reference reflector. One measuring reflector (6) is installed on a measuring carriage (15) slidable at least between the projections or marks. USE/ADVANTAGE - Universal application, from machine tools distance measuring to precision metrological range finding. Compensates for fluctuations in frequency of light from lase source and environment conditions as well temp. changes in material so that measurement results are not affected.