NTRS - NASA Technical Reports Server

Back to Results
Fiber-linked interferometric pressure sensorA fiber-optic pressure sensor is described which uses a diaphragm to modulate the mirror separation of a Fabry-Perot cavity (the sensing cavity). A multimode optical fiber delivers broadband light to the sensing cavity and returns the spectrally modulated light which the cavity reflects. The sensor's output spectrum is analyzed using a tunable Fabry-Perot cavity (the reference cavity) to determine the mismatch in the mirror separations of the two cavities. An electronic servo control uses this result to cause the mirror separation of the reference cavity to equal that of the sensing cavity. The displacement of the pressure-sensing diaphragm is then obtained by measuring the capacitance of the reference cavity's metal-coated mirrors. Relative to other fiber-optic sensors, an important advantage of this instrument is its high immunity to the effects of variations in both the transmissivity of the fiber link and the wavelength of the optical source.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Beheim, G.
(NASA Lewis Research Center Cleveland, OH, United States)
Fritsch, K.
(NASA Lewis Research Center Cleveland, OH, United States)
Poorman, R. N.
(John Carroll University Cleveland, OH, United States)
Date Acquired
August 13, 2013
Publication Date
September 1, 1987
Publication Information
Publication: Review of Scientific Instruments
Volume: 58
ISSN: 0034-6748
Subject Category
Instrumentation And Photography
Accession Number
Funding Number(s)
Distribution Limits

Available Downloads

There are no available downloads for this record.
No Preview Available