Method and apparatus for measuring pressure

Details Method and apparatus for measuring pressure Method and apparatus for measuring pressure

2005-02-15

2005-02-15

Turner, Samuel A. (Department: 2877)

Optics: measuring and testing

By light interference

Holography

Reexamination Certificate

active

06856399

ABSTRACT:
In one embodiment, an apparatus for measuring pressure is provided including a holographic element containing at least one volume hologram; a reference member; a sensing member coupled to the pressure being measured, and at least one light source; wherein the device operates by passing a reference light beam between the reference member and the holographic element, the reference beam having a constant optical path, and passing a sensing light beam between the sensing member and the holographic element, the sensing beam having optical path that varies as a function of the pressure; the volume hologram converting the reference beam and the sensing beam into an information light beam the intensity of which is a measure of the pressure. Preferably, the reference member and the sensing member are made from the same material.

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