Sagnac/Mach-Zehnder interferometer profile fiber sensing system and time domain positioning method thereof

The invention discloses a Sagnac/Mach-Zehnder interferometer profile fiber sensing system and a time domain positioning method thereof. The system comprises a nested structure of a Sagnac interferometer consisting of three fiber couplers and four fibers and a Mach-Zehnder interferometer, wherein the...

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Bibliographic Details
Main Authors WANG LUTANG, LI JIE, FANG NIAN, HUANG ZHAOMING
Format Patent
LanguageChinese
English
Published 04.07.2012
Subjects
MEASURING
MEASURING ANGLES
MEASURING AREAS
MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS
PHYSICS
TESTING
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Summary:The invention discloses a Sagnac/Mach-Zehnder interferometer profile fiber sensing system and a time domain positioning method thereof. The system comprises a nested structure of a Sagnac interferometer consisting of three fiber couplers and four fibers and a Mach-Zehnder interferometer, wherein the Sagnac/Mach-Zehnder interferometers are respectively connected with an incoherent light source andtwo photoelectric detectors. In the time domain correlation positioning method, the cross-correlation operation of disturbing signals detected by the Sagnac interferometer and the Mach-Zehnder interferometer are utilized to determine the time used from disturbance propagation to one end of a sensing fiber, the delay time of a maximum value point of a cross-correlation curve corresponds to the time, and a disturbance position is determined by using the time. The invention overcomes the defects of limit positioning distance and positioning precision of a traditional Sagnac nterferometer profilefiber sensing system.
Bibliography:Application Number: CN20101152403