发明名称 |
Distributed sensor array and method using a pulsed signal source |
摘要 |
A distributed sensor system using pulsed optical signals optionally produced by a short coherence length source to provide a phase difference output signal representative of conditions affecting a selected sensor. In one preferred embodiment, an array of fiber-optic sensors are organized in a ladder configuration, with the sensors positioned in spaced relation and defining the rungs of the ladder. Light pulses transmitted through the sensors are multiplexed onto a return arm of the ladder. The multiplexed signals are received by an optical fiber compensating interferometer which coherently couples portions of adjacent multiplexed light signals to produce a phase difference signal representing conditions influencing selected sensors. In other preferred embodiments, the system is configured to define a plurality of adjacent Mach-Zehnder interferometers which provide output signal pairs which coherently couple to yield a phase difference signal directly representing the environmental effects on a particular sensor. Functional equivalents of the Mach-Zehnder interferometer configurations comprise configurations including adjacent Michelson interferometers. A phase and amplitude modulation technique is disclosed for providing heterodyned output signals from the distributed sensor system.
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申请公布号 |
US4770535(A) |
申请公布日期 |
1988.09.13 |
申请号 |
US19860877296 |
申请日期 |
1986.06.23 |
申请人 |
THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY |
发明人 |
KIM, BYOUNG Y.;TUR, MOSHE;BROOKS, JANET L.;FESLER, KENNETH A.;SHAW, HERBERT J. |
分类号 |
G01J1/02;G01D5/353;G01H9/00;G01J9/02;G01R15/24;G08C23/04;(IPC1-7):G01B9/02 |
主分类号 |
G01J1/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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