Temporal interference effects by a pair of two-frequency laser beams — application to extremely low velocity measurements

Ohtsuka, Yoshihiro; Sasaki, Iwao

doi:10.1016/0030-4018(77)90021-9

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Remote Vibration Measurements1

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1991

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Cited by 12 publications

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“…However, the effects of noise can be minimized by shifting the desired signal to a higher frequency. One way to do this is, as shown in figure 14, to use a laser beam containing two frequency-shifted components produced by an acousto-optic modulator (Ohtsuka andSasaki 1977, Ohtsuka andItoh 1979). The output from the interferometer is then given by an expression of the form where IR and 1, are the intensities of the reference beam and the signal beam, qR is the constant part and ps(t) is the time-varying part of the phase difference between the two beams and f m is the frequency difference between them.…”

Section: Remote Vibration Measurementsmentioning

confidence: 99%

Optical interferometry

Hariharan

1991

Rep. Prog. Phys.

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Developments in optical interferometry over the last two decades are reviewed. This period has seen this field revitalized by the invention of the laser: significant advances have also stemmed from the use of photoelectric detectors, digital computers, singlemode optical fibres and nonlinear optical crystals. Other new developments include holographic interferometry and electronic speckle-pattern interferometry. Current techniques and applications are described and prospects for the future are discussed.

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Section: Remote Vibration Measurementsmentioning

confidence: 99%