Ultra-low fiber bragg grating sensing system and query method thereof
A weak fiber grating and sensing system technology, applied in the field of sensing, can solve the problems such as the inability to accurately detect and process the reflected pulse signal, the limit of the minimum reflectivity and the maximum multiplexing number of the grating, and the lack of isolated pulse crosstalk. The effect of query speed, the realization of fast query, and the effect of real-time collection
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[0042] The temperature is detected below, taking a time-division multiplexing sensing system composed of N identical fiber Bragg gratings (assuming N=500, Bragg wavelength 1303.3nm, reflectivity 0.01%, and the distance between gratings 5m) as an example to describe in detail illustrate.
[0043] The time-division optical fiber grating sensing monitoring method in the present invention adopts "quasi-distributed optical fiber grating sensing" technology to monitor the temperature of 500 monitoring points for a long time and stably.
[0044] according to figure 2 Schematic diagram of the structure of the system, and its specific implementation steps are:
[0045] 1. Determine the location and distribution of temperature monitoring points: According to the specific conditions of the monitoring site, determine the location of 500 monitoring points, initially estimate the temperature value and its changing trend, and calculate the general situation of the temperature distribution ...
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