This article describes a distance measuring instrument based on a freq
uency-modulation continuous wave interferometer implemented in a compa
ct setup suitable for industrial applications. The prototype uses a vi
sible laser diode that is frequency-modulated with a triangular wave f
orm. Measurements carried out with a cooperative target show a measuri
ng range from 130 to 300 mm with a relative accuracy of 1.2 X 10(-3).
(C) 1998 American Institute of Physics. [S0034-6748(98)01311-2]