Differential pressure measuring system and differential...

Optics: measuring and testing – By light interference – Using fiber or waveguide interferometer

Reexamination Certificate

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C356S480000, C385S012000

Reexamination Certificate

active

07623245

ABSTRACT:
A differential pressure measuring system includes a light source for emitting a light, a first transducer for attenuating the intensity of the emitted light in a first range, depending on a first pressure, and providing a first light, a second transducer for attenuating the intensity of the first light in a second range, depending on a second pressure, and providing a second light, a feedback circuit for adjusting the intensity of the emitted light to maintain the intensity of the second light in the second range constant, and a measuring module for measuring a differential pressure between the first and second pressures, based on the intensities of the second light in the first and second ranges.

REFERENCES:
patent: 4730622 (1988-03-01), Cohen
patent: 4899046 (1990-02-01), Wright et al.
patent: 4933545 (1990-06-01), Saaski et al.
patent: 5798834 (1998-08-01), Brooker
patent: 6829397 (2004-12-01), Wang et al.
patent: 2003/0234921 (2003-12-01), Yamate et al.
patent: 2005/0232531 (2005-10-01), Hadley et al.
patent: 2003-166890 (2003-06-01), None

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