Patent
Method and apparatus for positioning object in space using a low-coherence laser beam which is reflected by two references to sharpen the interference fringe lines
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TLDR
In this article, an object is positioned in space by using a beam splitter to split a low-coherence laser light beam into a probe beam and a reference beam, while the reference beam is reflected by a pair of mirrors synchronized along light paths and scanned at different amplitudes, to form two beams of equal intensity.Abstract:
An object is positioned in space by using a beam splitter to split a low-coherence laser light beam into a probe beam and a reference beam. The probe beam is projected at the target object, while the reference beam is reflected by a pair of mirrors synchronized along light paths and scanned at different amplitudes, to form two beams of equal intensity, and light reflected by the object and the interference fringes are detected together to obtain fringe signals with sharpened profile lines.read more
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Device for determining the position of spaced-apart areas in transparent and/or diffuse objects
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Interferometer having a short coherence length light source and means for identifying interference fringes
TL;DR: In this paper, an interferometer uses a short coherence length light source in such a way that the visibility of fringes produced varies as a function of the measurand, in order to provide a signal which represents the value of the fringes is calculated.
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Self-calibrating interferometer
TL;DR: A self-calibrating interferometer which forms a pair of Michelson interferometers with one beam length of each Michelson Interferometer being controlled by a common phase shifter is described in this paper.
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High-accuracy air refractometer utilizing two nonlinear optical crystal producing 1st and 2nd second-harmonic-waves
TL;DR: In this article, an air refractometer measures the refractive index of air by directing a laser beam onto a first nonlinear optical crystal to convert a part thereof into a second-harmonic wave, and divides the number of interference fringes by the distance moved by the reflecting mirror.