Extended range pseudo-heterodyne demodulation for fiber optic sensors |
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| Authors: | J S Sirkis A D Kersey T A Berkoff E J Friebele |
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| Institution: | (1) Department of Mechanical Engineering, University of Maryland, 20742 College Park, MD;(2) Optical Sciences Division, Naval Research Laboratory, Code 5600, 20073 Washington, DC;(3) SFA Inc., 20785 Landover, MD |
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| Abstract: | This article describes a pseudo-heterodyne demodulation technique for interferometric fiber optic sensors that has a larger
measurement range than is currently possible with pseudo-heterodyne demodulation. This sensor demodulation technique has a
bandwidth of 30 Hz to 2.5 kHz, is capable of resolving optical phase angles as small as 5×10−4 rad, and has a maximum measurement range of tens of radians in a bandwidth of 30–500 Hz. A comparison between the response
obtained from a resistance strain gage and a fiber optic sensor using this demodulation is favorable. |
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