Heterodyne interferometric optical fiber displacement sensor for

Details Heterodyne interferometric optical fiber displacement sensor for Heterodyne interferometric optical fiber displacement sensor for

1992-12-11

1995-03-28

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356358, 356345, G01B 902

Patent

active

054022304

ABSTRACT:
A heterodyne interferometric optical fiber displacement sensor using a laser diode. The frequency and the intensity of the laser diode beam are periodically modulated by an injection current. The laser diode beam is routed to a rod lens via a first optical fiber, an optical fiber coupler, and a second optical fiber. The interference light resulting from the interference between the light reflected from the exit surface of the rod lens and the light reflected from an object surface is routed to a third optical fiber via the optical fiber coupler, which is then detected by a photodiode attached to the end of the third optical fiber. From the output of the photodiode, a given frequency component is extracted using a bandpass-filter. The extracted signal is converted into a pulse signal. The frequency change of the pulse signal (equivalent to a doppler frequency shift caused by the movement of the object surface) is accumulated using an electronic circuit. Then, the accumulated value is used to calculate the displacement of the object surface.

REFERENCES:
patent: 4627731 (1986-12-01), Waters et al.
patent: 4886363 (1989-12-01), Jungquist
patent: 4918492 (1990-04-01), Ferdinand et al.
patent: 5106191 (1992-04-01), Ohtsuka
patent: 5187546 (1993-02-01), Johnston
Journal of Physics E. Scientific Instruments, D. A Jackson, "Monomode Optical Fibre Interferometers for Precision Measurement", Dec. 1985.

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