Reflection-type Sagnac interference fiber current sensor

The invention discloses a reflection-type Sagnac interference fiber current sensor. The sensor comprises: a broadband light source, a fiber polarizer, a fiber polarization analyzer, a lithium niobate multifunctional integration device, a fiber loop device, a polarization-maintaining transmission cab...

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Bibliographic Details
Main Author XIAO YUEYU
Format Patent
LanguageChinese
English
Published 25.04.2012
Subjects
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Summary:The invention discloses a reflection-type Sagnac interference fiber current sensor. The sensor comprises: a broadband light source, a fiber polarizer, a fiber polarization analyzer, a lithium niobate multifunctional integration device, a fiber loop device, a polarization-maintaining transmission cable, a quarter wave plate, a sensing fiber, a photoelectric detector and a signal processing unit. The lithium niobate multifunctional integration device, which is formed by two polarization beam splitters, is a Mach-Zehnder phase adjusting system. The structure can realize passive bias and can realize active modulation. By using the sensor of the invention, technical difficulty of an active modulation scheme of the interference fiber current sensor can be substantially reduced. Simultaneously, unification of an optical path structure of the two schemes: the passive bias of the fiber current sensor and the active modulation can be realized.
Bibliography:Application Number: CN20111316901