Optical pressure detection method and apparatus

Details Optical pressure detection method and apparatus Optical pressure detection method and apparatus

1996-05-01

1999-07-27

Kim, Robert H.

Optics: measuring and testing

By particle light scattering

With photocell detection

356 355, 356349, 356351, 356361, 359129, 359130, G41B 902

Patent

active

059299894

ABSTRACT:
Light from a light source is fed to a sensing probe through a polarization plane-reserving fiber, and is split into two light beams, that is, a reference beam and a measurement beam. The reference beam is passed through a reference medium, and the measurement beam is passed through a pressure-sensitive medium, which may be in the form of gas. Then, the reference beam and the measurement beam are fed to a light-receiving portion via the polarization plane-reserving fiber, and are converted into electrical signals. The electrical signals are inputted into a signal processing portion, and the optical path length difference between the reference and measurement beams, passed through their respective mediums, is determined, and the pressure of the pressure-sensitive medium is detected from this optical path length difference.

REFERENCES:
patent: 5301001 (1994-04-01), Murphy et al.
patent: 5483343 (1996-01-01), Iwamoto et al.
patent: 5491550 (1996-02-01), Dabbs
patent: 5648848 (1997-07-01), Aiyer et al.

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