title: Distance and velocity measurements by the use of an orthogonal Michelson interferometer.
abstract: A novel signal processing scheme for detecting distance and velocity signals simultaneously is demonstrated. In this method, a frequency-modulated diode laser is used to illuminate a dual-channel Michelson interferometer with two orthogonal output signals. The distance and the velocity signals then exist on the beat frequencies of the output interferometric signal. Two interferometric output signals with a quadrature phase shift are used to adjust the gating time period of frequency counters for beat-frequency measurement. The distance and velocity signals can thus be obtained from the counting number within the gated-in time period.
authors.forename: Y S
authors.initials: YS
authors.lastname: Chang
authors.forename: P Y
authors.initials: PY
authors.lastname: Chien
authors.forename: M W
authors.initials: MW
authors.lastname: Chang