【摘要】：煤礦電纜線路故障造成的火災(zāi)是煤礦井下發(fā)生火災(zāi)的主要原因之一,而傳統(tǒng)的火災(zāi)探測僅僅是利用溫度信號直接轉(zhuǎn)換成電信號進(jìn)行探測的,而電信號的在煤礦井下傳輸時容易受到干擾,導(dǎo)致測量精度、相應(yīng)時空間分辨率等都較低,針對煤礦電纜線路老化、絕緣皮破損等造成的煤礦井下的火災(zāi)問題,本文利用分布式光纖傳感技術(shù),設(shè)計(jì)了能夠?qū)γ旱V井下實(shí)現(xiàn)溫度動態(tài)監(jiān)測預(yù)警系統(tǒng)。該系統(tǒng)不同于以往的火災(zāi)探測的“點(diǎn)”式測量,該系統(tǒng)利用一根感溫光纖實(shí)現(xiàn)溫度的分布式測量,光纖既是溫度傳感器,又是信號的傳輸介質(zhì),并且光信號在傳播過程中,是完全電絕緣的,不容易受到外界的干擾,同時,本系統(tǒng)能實(shí)現(xiàn)對沿線多點(diǎn)進(jìn)行溫度測量,能對溫度異常點(diǎn)進(jìn)行準(zhǔn)確定位,實(shí)現(xiàn)溫度預(yù)警,因此,其具有重要的研究價值。本應(yīng)用研究不僅分析了研究的目的、意義以及分布式光纖的未來發(fā)展趨勢,還對分布式光纖的測溫原理有著全面系統(tǒng)的介紹。在總體結(jié)構(gòu)上,設(shè)置了光源模塊、光電轉(zhuǎn)換、信號處理以及界面顯示部分,結(jié)合煤礦井下的實(shí)際環(huán)境,本文對各模塊重要元器件的選擇都做了較為詳細(xì)的分析。此外,在系統(tǒng)降噪方面,本文分兩個方面進(jìn)行了分析,選擇了最能適用于本系統(tǒng)的方法,特別是在利用現(xiàn)代信號處理技術(shù)降噪方面,本文利用了累加平均和小波算法進(jìn)行降噪,同時針對系統(tǒng)的瑞利噪聲,系統(tǒng)在傳統(tǒng)的感溫光纖的溫度解調(diào)方法的基礎(chǔ)上進(jìn)行了優(yōu)化設(shè)計(jì),提高了整個系統(tǒng)的性能最后本文在界面顯示部分,利用了LABVIEW對系統(tǒng)界面進(jìn)行了設(shè)計(jì),在上位機(jī)界面上,能清晰地看到各個預(yù)設(shè)點(diǎn)的溫度值以及變換趨勢,一旦溫度值超過預(yù)先設(shè)定的溫度范圍時,會啟動報警聯(lián)動裝置,提醒工作人員采取相關(guān)的手段方法,真正能做到對電纜故障造成的潛在火災(zāi)事故進(jìn)行消除
[Abstract]:The fire caused by the fault of coal mine cable line is one of the main causes of underground fire in coal mine, but the traditional fire detection only uses the temperature signal to convert the electric signal directly to detect. The electrical signal transmission in coal mine is easy to be interfered with, which leads to low measurement precision and corresponding spatial resolution. Aiming at the problems of coal mine underground fire caused by the aging of cable line and the damaged insulation skin, etc. In this paper, the distributed optical fiber sensing technology is used to design a dynamic temperature monitoring and warning system for underground coal mines. The system is different from the "point" measurement of fire detection in the past. The system uses a temperature sensing fiber to realize the distributed measurement of temperature. The optical fiber is not only a temperature sensor but also a transmission medium of the signal, and the optical signal is propagating in the process. It is completely electric insulation and is not easily disturbed by the outside world. At the same time, the system can measure the temperature of many points along the route, locate the temperature anomaly accurately, and realize the temperature warning. Therefore, it has important research value. This application study not only analyzes the purpose and significance of the research and the future development trend of distributed optical fiber, but also introduces the principle of temperature measurement of distributed optical fiber in a comprehensive and systematic way. In the overall structure, the light source module, photoelectric conversion, signal processing and interface display part are set up. Combined with the actual environment of underground coal mine, the selection of important components of each module is analyzed in detail in this paper. In addition, in the aspect of system noise reduction, this paper analyzes two aspects, and selects the most suitable method for the system, especially in the aspect of using modern signal processing technology to reduce noise, this paper makes use of accumulative average and wavelet algorithm to reduce noise. At the same time, aiming at the Rayleigh noise of the system, the system is optimized and designed on the basis of the traditional temperature demodulation method of the temperature sensing fiber, which improves the performance of the whole system. The interface of the system is designed by using LABVIEW. On the upper computer interface, the temperature value and the changing trend of each preset point can be clearly seen. Once the temperature value exceeds the preset temperature range, the alarm linkage device will be activated. Staff are reminded to take relevant measures to eliminate potential fire accidents caused by cable failures.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD752.1

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