【摘要】：電類(lèi)傳感器在易燃易爆環(huán)境下測(cè)量具有極大的潛在危險(xiǎn)性,如在油罐溫度、礦井粉塵濃度測(cè)量等環(huán)境中易引發(fā)爆炸,造成重大事故�；诶⑸淅碚�,提出了全分布式光纖測(cè)溫方案,對(duì)系統(tǒng)的光功率進(jìn)行了估算,提出了器件選型方案、傳感光纖封裝與布設(shè)方案、解調(diào)與定標(biāo)方案。在數(shù)據(jù)采集與處理方面,提出了整體去噪方法,即線性累加平均與小波變換軟閾值配合使用的去噪方法。最后對(duì)測(cè)溫系統(tǒng)進(jìn)行了實(shí)驗(yàn)標(biāo)定,在標(biāo)定過(guò)程中,針對(duì)背向拉曼散射光強(qiáng)比隨距離衰減的問(wèn)題,提出了以e為底的指數(shù)修正方案,并用MATLAB進(jìn)行了定標(biāo)曲線擬合。通過(guò)測(cè)溫實(shí)驗(yàn)、空間分辨率實(shí)驗(yàn)驗(yàn)證了系統(tǒng)的性能指標(biāo),測(cè)溫精度為0.7℃,空間分辨率為0.7m,達(dá)到系統(tǒng)設(shè)計(jì)要求。
[Abstract]:The measurement of electric sensors in flammable and explosive environment has great potential danger, such as oil tank temperature, mine dust concentration measurement and so on, which can easily lead to explosion and cause serious accidents. Based on the Raman scattering theory, a fully distributed optical fiber temperature measurement scheme is proposed, the optical power of the system is estimated, the device selection scheme, the sensor fiber packaging and layout scheme, the demodulation and calibration scheme are proposed. In the aspect of data acquisition and processing, a global denoising method is proposed, that is, linear cumulative average and wavelet transform soft threshold. Finally, the temperature measurement system is calibrated experimentally. In the process of calibration, aiming at the attenuation of backscatter intensity ratio with distance, an exponential correction scheme based on e is proposed, and the calibration curve is fitted by MATLAB. The performance index of the system is verified by the experiments of temperature measurement and spatial resolution. The precision of temperature measurement is 0.7 鈩，

本文編號(hào)：2351801