Optical fiber vibration detection equipment based on foreign fiber remote pump amplification

• Main Authors: TAN DONGJIE, SUN WEI, WANG HAIMING, QIU HONGHUI, LIU LU, TIAN XIAOZHONG, ZHOU YAN, GUO FENGLIN, CAI YONGJUN, MA YUNBIN
• Format: Patent
• Language: English
• Published: 25.02.2015
• Subjects: MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES; MEASURING; PHYSICS; TESTING

The utility model discloses optical fiber vibration detection equipment based on foreign fiber remote pump amplification. The equipment comprises an optical fiber vibration sensor based on a coherent rayleigh scattering technology and N remote pump amplifiers, wherein the sensor comprises an annular device of three ports; the N remote pump amplifiers are connected in series one by one through a sensing optical fiber; the N remote pump amplifiers are connected to the sensor through a remote pump optical fiber; a first remote pump amplifier of the N remote pump amplifiers is connected to the annular device through the sensing optical fiber; the first remote pump amplifier receives a pulse light source from the annular device and successively transmits to the remote pump amplifiers which are connected in series; each remote pump amplifier in the N remote pump amplifiers amplifies the pulse light source received by each remote pump amplifier and N is a positive integer which is greater than 1. A foreign fiber remote pump amplification mode is used and centralized amplification is performed on each segment of sensing optical fibers so that a fai-OTDR sensing distance can be effectively lengthened; a light signal used for detection is enhanced and detection accuracy is increased.