基于OFDR的带式输送机全域智能精准测温系统设计

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中图分类号：TD634 文献标志码：A

Abstract：Rapid and precise measurement of temperature along the belt conveyor playsa core role in preventing external fire hazards incoal mines.Distributed optical fiber temperature measurement based on Optical Time-Domain Reflectometry （OTDR） is currently the mainstream technology for temperature measurement along belt conveyors，but it sufers from low temperature measurement accuracyand large positioning errors.Toaddress thisissue，an Optical Frequency Domain Reflectometry （OFDR）-based full-area intelligent and precise temperature measurement system for belt conveyors Was proposed.By analyzing the system's technical route and architecture，Raman scatering wasdetermined as the theoretical basis，fast Fourier transformas the signal processing algorithm，and a tunable semiconductor laser was selected.A four-layer composite-structured OFDR optical cable with a diameter of 4 mm was designed，with the diameter reduced by 50% compared with traditional OTDR optical cables， the maximum tensile strength increased by 33% ， and the maximum compressive strength improved by 233% . An industrial test was carried out along the No.l South Wing belt conveyor of Shanxi Gaohe Energy Co.，Ltd.The results showed that the system operated stably for one year， with a system inspection cycle of 12.5s. ，a temperature measurement accuracy of 0.5°C ， and a positioning accuracy of 0.25m ，all meeting the requirements of NB/T 10183—2019 Distributed Optical Fiber Temperature Measuring Device for Mine and surpassing the currnt advanced industry level. At the same time，the system reliably provided alarm functions for temperature over-limit， temperature rise， and temperature difference.

Key words： belt conveyor; conveyor belt temperature measurement; optical fiber temperature measurement Optical Time-Domain Reflectometry; Optical Frequency Domain Reflectometry; OFDR; OTDR

0引言

在煤炭开采中，带式输送机作为连续运输设备，担负着主要运输和主斜井提升等重要任务。（剩余15349字）