本文選題：EFPI傳感器 + 實(shí)時解調(diào)��； 參考：《中北大學(xué)》2017年碩士論文

【摘要】：非本征型法布里-珀羅干涉(EFPI)光纖傳感器由于其抗電磁干擾、精度高、絕緣性能高、重量輕、體積小、遠(yuǎn)距離傳輸?shù)韧怀鰞?yōu)點(diǎn),得到了國內(nèi)外各項(xiàng)工程的廣泛應(yīng)用,涉及了航天航空、醫(yī)療、礦井、高壓供電等各個領(lǐng)域;對于EFPI光纖傳感器,要實(shí)現(xiàn)傳感信號的解調(diào),解調(diào)技術(shù)是影響測量精度和測量速度的關(guān)鍵點(diǎn),因此對基于EFPI傳感器解調(diào)系統(tǒng)的研究和推進(jìn)各個領(lǐng)域的發(fā)展具有重要意義。本文研究的對象為基于MEMS工藝的光纖法珀高溫壓力傳感器,主要用于測量高溫下壓力的變化,針對此結(jié)構(gòu)的EFPI傳感器信號,利用高速可編程邏輯器件(FPGA)實(shí)現(xiàn)實(shí)時解調(diào)技術(shù)。設(shè)計(jì)了一套完整的光纖信號解調(diào)系統(tǒng),包括傳感模塊、實(shí)時解調(diào)硬件模塊、FPGA邏輯模塊等。傳感模塊主要搭建了一個光路系統(tǒng),通過光源、可調(diào)諧濾波器、標(biāo)準(zhǔn)具等光學(xué)器件,將傳感信號傳輸?shù)紽PGA中進(jìn)行處理;實(shí)時解調(diào)硬件模塊主要設(shè)計(jì)了硬件系統(tǒng),通過高速ADC、DAC、可編程運(yùn)放,實(shí)現(xiàn)光電轉(zhuǎn)換和傳感模塊的控制;FPGA邏輯模塊,編寫解調(diào)邏輯代碼,實(shí)現(xiàn)了邏輯算法和數(shù)據(jù)采集;同時,本文針對光源光功率不穩(wěn)定的現(xiàn)象,提出了一種基于硬件的光功率補(bǔ)償法,并對補(bǔ)償法進(jìn)行了Matlab仿真和邏輯編程實(shí)現(xiàn),最后將算法邏輯封裝成IP核,完成了光功率的補(bǔ)償。峰值解算上,引用了固定閾值的質(zhì)心法尋峰和插值法實(shí)時標(biāo)定,通過FPGA邏輯編程仿真,封裝成IP核。實(shí)驗(yàn)結(jié)果表明,光功率補(bǔ)償和尋峰方法可行,結(jié)果可靠精度高。最后,本文對MEMS EFPI傳感器解調(diào)系統(tǒng)的應(yīng)用方面進(jìn)行了介紹,總結(jié)了論文成果并為今后的進(jìn)一步研究做了展望。
[Abstract]:The extrinsic Fabry-Perot Interferometer (EFPI) optical fiber sensor has been widely used in various projects at home and abroad because of its outstanding advantages of anti-electromagnetic interference, high precision, high insulation performance, light weight, small volume and long distance transmission. It involves aerospace, medical treatment, mine, high-voltage power supply and other fields. For EFPI optical fiber sensor, demodulation technology is the key point that affects the measurement accuracy and speed to realize the demodulation of sensing signal. Therefore, it is of great significance to research and promote the development of demodulation system based on EFPI sensor. The research object of this paper is optical fiber Fabry-Perot high-temperature pressure sensor based on MEMS process, which is mainly used to measure the change of pressure at high temperature. Aiming at the signal of EFPI sensor with this structure, the real-time demodulation technology is realized by using high-speed programmable logic device (FPGA). A complete fiber signal demodulation system is designed, including sensing module, real time demodulation hardware module and FPGA logic module. The sensing module mainly builds an optical circuit system, which transmits the sensing signal to FPGA through optical devices such as light source, tunable filter, standard device, etc. The hardware module of real-time demodulation mainly designs the hardware system. The FPGA logic module of optoelectronic conversion and sensing module is realized by using high speed ADC DAC, programmable operational amplifier, demodulation logic code is compiled, logic algorithm and data acquisition are realized, meanwhile, the phenomenon of unstable optical power of light source is analyzed in this paper. An optical power compensation method based on hardware is proposed, and the compensation method is implemented by Matlab simulation and logic programming. Finally, the algorithm logic is encapsulated into IP core and the optical power compensation is completed. In the peak solution, the fixed threshold method is used to find the peak and the interpolation method is used to calibrate it in real time. The IP core is encapsulated by FPGA logic programming simulation. The experimental results show that the optical power compensation and peak finding method are feasible and the results are reliable and accurate. Finally, this paper introduces the application of MEMS EFPI sensor demodulation system, summarizes the results of the paper and makes a prospect for further research.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP212;TN791

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