Optical differential pressure sensor
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United States of America Patent
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Nov 23, 2004
Issued Date -
N/A
app pub date -
Aug 22, 2003
filing date -
Dec 4, 1998
priority date (Note) -
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Abstract
A fiber grating pressure sensor includes an optical sensing element which includes an optical fiber having a Bragg grating impressed therein which is encased within and fused to at least a portion of a glass capillary tube and/or a large diameter waveguide grating having a core and a wide cladding. Light is incident on the grating and light is reflected from the grating at a reflection wavelength .lambda.1. The sensing element may be used by itself as a sensor or located within a housing. When external pressure P increases, the grating is compressed and the reflection wavelength .lambda.1 changes. The shape of the sensing element may have other geometries, e.g., a 'dogbone' shape, so as to enhance the sensitivity of shift in .lambda.1 due to applied external pressure and may be fused to an outer shell.
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