Distributed optical fiber Raman temperature monitor for granary based on pulse coding technology

Abstract

The invention relates to a distributed optical fiber Raman temperature monitor for a granary based on the pulse coding technology for granary safety detection, and belongs to the field of grain reserve. The temperature monitor is characterized in that the temperature monitor comprises a temperature measurement optical cable in the granary; a temperature measurement demodulating module which consists of a laser light source, an acousto-optic pulse modulator, an optical fiber bidirectional coupler, an optical wavelength division multiplexer, an avalanche diode, an amplifier, a signal processor and a PC host; a communication module, an alarm module and a remote client for monitoring. When the laser light source injects optical pulses into the optical fiber, a part of Raman scattering light closely related to the temperature can be generated and positioned through the optical time domain reflection technology, the signal-to-noise ratio is improved through the simplex cyclic encoding and decoding technology, and the temperature of a point to be measured can be obtained. The invention provides a safe, practical and high-sensitivity granary temperature measurement monitor, aiming at solving the problems of time and labor waste, low accuracy, electronic monitoring short circuit, limited sensing points, easiness in causing a fire and the like of manual inspection in the granary at present.

Description

technical field [0001] The invention belongs to the technical field of grain storage, in particular to a distributed optical fiber Raman temperature monitor for granaries based on pulse coding technology. Background technique [0002] The food issue is related to the national economy and the people's livelihood, and is the most important task for the survival and development of human society. The old proverb "Food is paramount to the people" reflects the basic position and important strategic position of the grain industry from the side. Therefore, the security issues and security strategies of the grain industry are related to the economic and political situation of any country. Self-sufficiency in food means that the country is economically independent and not subject to others in the international economic arena. If a country cannot achieve food self-sufficiency, it will inevitably be controlled by others in international relations. Therefore, it can be said that food i...

AI Technical Summary

Problems solved by technology

The invention adopts distributed optical fiber Raman sensing technology, which can realize all-round temperature monitoring of multiple granary temperatures, can overcome the existing wireless granary temperature monitoring system with short transmission distance, low speed, and complicated networking, and solves the dependence between sensor nodes Strong resistance, poor wall-penetrating effect, high power consumption, regular replacement of batteries, etc.

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