Journal ArticleDOI
Real-time displacement measurement using synchronous detection in a sinusoidal phase modulating interferometer
TLDR
In this article, a real-time displacement measurement system using a sinusoidal phase modulating interferometer is proposed and demonstrated, which utilizes the frequency components of the interference signal to detect the desired phase or the displacement in real time.Abstract:
A real-time displacement measurement system using a sinusoidal phase modulating interferometer is proposed and demonstrated. The system utilizes the frequency components of the interference signal to detect the desired phase or the displacement in real time. The real-time phase detector is constructed with simple electronic circuits. The system also has a feedback loop to eliminate external disturbance. It is easy to measure the relatively large displacement that exceeds a half wavelength of the light because the compensation circuit is incorporated into the system to obtain continuous phase outside the region from 0 to 2π.read more
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Journal ArticleDOI
Real-time displacement measurement with a two-wavelength sinusoidal phase-modulating laser diode interferometer.
TL;DR: A two-wavelength interferometer that uses two separate modulating currents with different phases but the same frequencies to detect a greater degree of object displacement in real time is proposed and demonstrated.
Journal ArticleDOI
Precision optical displacement sensor based on ultra-thin film photodiode type optical interferometers
TL;DR: In this paper, a detailed description of the principle, design, fabrication process and performance of PODS for application in both smooth and rough surfaces is given, as well as a detailed analysis of the performance of optical displacement sensor for smooth surfaces.
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Phase-locked phase-shifting laser diode interferometer with photothermal modulation
TL;DR: A phase-shifting interferometer that uses both phase-locked and photothermal modulating techniques and the measurement accuracy is not affected by the intensity modulation that usually appears in current modulation is proposed.
Journal ArticleDOI
Interferometry for ocular microtremor measurement.
TL;DR: A laser-based, noncontacting, interferometric technique for the measurement of ocular microtremor, which employs an in-plane-sensitive, phase-modulating speckle interferometer to detect the movement of the sclera, or white of the eye.
Journal ArticleDOI
Sinusoidal phase modulating laser diode interferometer for on-machine surface profile measurement
TL;DR: In this article, a disturbance-free sinusoidal phase modulating laser diode interferometer using an accelerated integrating buckets processing system is described, which is suitable for use in on-machine measurements.