| 摘要 |
The present invention discloses a demodulation system for 3D-matrix multi-channel fiber optic sensing which comprises a wavelength swept optical source that generates an incident light. The demodulation system further comprises an optical frequency domain reflector and a balanced detector connected with the wavelength swept optical source through a fiber circulator. The optical frequency domain reflector comprises a first optical path and a second optical path with a frequency shifter arranged on one or both of the optical paths. The optical frequency domain reflector outputs the incident light to an optical switch module. The optical switch module selectively transmits the incident light to the sensor network as well as transmits the reflection light from the sensor network to the optical frequency domain reflector. The present invention employs existing optical devices to identify the location of the sensors by using an FFT transform, thereby enabling the function of a multiplexing distributed sensor network. The present invention has a simple structure and a low cost, and can enhance the spatial resolution by increasing the number of the frequency shifters. In addition, the spacing between neighboring sensors in the present invention can reach the millimeter level, which is particularly suitable for a micro-scale quasi-distributed sensing system. |
