Patent ID: 11933646
Assignee: WUHAN UNIVERSITY OF TECHNOLOGY
Field: Measurement (Instruments)
Classification: CPC G  H  Y | IPC G  H

Claim 0:
1. An interferometric demodulation system for a large capacity fiber grating sensing network, comprising: a nanoscale wide-spectrum light source, a pulse optical modulator, an optical circulator, a reference grating, a grating array sensing network, an optical amplifier, a Mach-Zehnder interferometer, a photoelectric converter, an embedded signal processor and a heating device; wherein: a continuous light output end of the nanoscale wide-spectrum light source is connected to an input end of the pulse optical modulator, and an output end of the pulse optical modulator is connected to a first communication end of the optical circulator, a second communication end of the optical amplifier is connected to an input end of the reference grating, an output end of the reference grating is connected to an input end of the grating array sensing network, and a third communication end of the optical circulator is connected to an input end of the optical amplifier, an output end of the optical amplifier is connected to an input end of the Mach-Zehnder interferometer, three-channel signal output ends of the Mach-Zehnder interferometer are respectively connected to signal input ends corresponding to the embedded signal processor through the photoelectric converter, and the embedded signal processor controls the heating device to control a temperature of an any one of interference arms of the Mach-Zehnder interferometer,
wherein the nanoscale wide-spectrum light source comprises a broadband light source, an optical filter, the optical amplifier and a gain-saturated semiconductor optical amplifier, and
wherein the optical filter is a nanoscale optical band-pass filter, a bandwidth range of a nanoscale optical band-pass filter is the same as a bandwidth range of the grating array sensing network, and the broadband light source emits a wide-spectrum optical signal, and the wide-spectrum optical signal is band-pass filtered by the optical filter, thus a filtered signal broadband is the same as a working bandwidth of the grating array sensing network, then the filtered signal is power amplified by the optical amplifier, and then is power compensated and shaped by the gain-saturated semiconductor optical amplifier, and finally a nanoscale wide-spectrum optical signal is output;
the pulse optical modulator is used for modulating an input nanoscale wide-spectrum optical signal into a pulse optical signal, so as to distinguish reflected signals of adjacent FBG in the grating array sensing network; and
the pulse optical modulator is also used to amplify the pulse optical signal power.