Distance and velocity detection based on a deep sinusoidal phase-modulated interferometer

To simulate a phase-modulated interferometer, a novel electrical signal generator has been demonstrated. There are two phase-locked loop (PLL) circuits used in our system to process the phase signal. The first PLL is adopted as a voltage-controlled phase shifter, and the second PLL is used to amplify the phase signal to get a phase shift with a dynamic range over ±16π rad. This system can be further modulated with sinusoidal, sawtooth, and triangular wave forms for interferometric signal detection.

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Optical interferometric signal generator based on electrical phase-locked loop technique

Chang

Lee

Chien

1998

Review of Scientific Instruments

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Automatic measurement of surface height with the interferoscope

1996

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Distance and velocity measurements by the use of an orthogonal Michelson interferometer

1997

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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.

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Distance and velocity detection based on a deep sinusoidal phase-modulated interferometer

Abstract: A deep phase-modulation signal with a sinusoidal waveform is employed on a Michelson interferometer for detecting distance and velocity signals simultaneously. This approach is simple to implement and has a wide-dynamic-range capability with a linear scale factor.

Cited by 3 publications

References 10 publications

Optical interferometric signal generator based on electrical phase-locked loop technique

Optical interferometric signal generator based on electrical phase-locked loop technique

Automatic measurement of surface height with the interferoscope

Distance and velocity measurements by the use of an orthogonal Michelson interferometer

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