本文選題：增敏檢測 + 光纖傳感　； 參考：《光電子.激光》2014年05期

【摘要】：基于外差相干檢測原理,摒棄了傳統(tǒng)掃頻構(gòu)建布里淵散射頻譜的方法,以布里淵散射光功率為應(yīng)變監(jiān)測參量,利用具有增敏作用的高頻脈沖檢波管對布里淵散射拍頻信號進(jìn)行包絡(luò)檢波,直接將拍頻信號轉(zhuǎn)換成布里淵散射功率信號,并對攜帶應(yīng)變信息的布里淵散射功率信號進(jìn)行應(yīng)變增敏檢測,利用高頻脈沖檢波管增益響應(yīng)曲線對功率信號的調(diào)制提高散射功率應(yīng)變敏感系數(shù)。經(jīng)測試,增敏后布里淵散射光功率應(yīng)變敏感系數(shù)為0.024%/με,與傳統(tǒng)直接檢測法得到的應(yīng)變敏感系數(shù)-7.7×10-4%/με相比,敏感系數(shù)提高30倍,有效提高了系統(tǒng)信噪比;對增敏后的布里淵功率信號進(jìn)行解調(diào),在24.7km的光纖長度上,實現(xiàn)65με的應(yīng)變測量標(biāo)準(zhǔn)差,測量時間由傳統(tǒng)掃頻方法的超過30s降為僅1s。本文系統(tǒng)可有效滿足快速精確檢測應(yīng)變的監(jiān)測需求,且不需要掃頻模塊等復(fù)雜器件,結(jié)構(gòu)簡單,穩(wěn)定性高,對實際應(yīng)用具有重要的意義。
[Abstract]:Based on the principle of heterodyne coherence detection, the method of constructing Brillouin scattering spectrum is abandoned, and Brillouin scattering light power is used as the strain monitoring parameter. The Brillouin scattering beat signal is detected by an enhanced high frequency pulse detector, and the beat frequency signal is converted directly into the Brillouin scattering power signal. The strain sensitizing detection of Brillouin scattering power signal with strain information is carried out, and the modulation of power signal by gain response curve of high frequency pulse detector tube is used to improve the strain sensitivity coefficient of scattering power. The strain sensitivity coefficient of Brillouin scattering light is 0.024 / 渭 蔚, which is 30 times higher than the strain sensitivity coefficient -7.7 脳 10 ~ (-4) / 渭 蔚 of the conventional direct detection method, and the signal-to-noise ratio of the system is improved effectively. Based on the demodulation of Brillouin power signal, the strain measurement standard deviation of 65 渭 蔚 is realized in the fiber length of 24.7km. The measuring time is reduced from 30 s to 1 s. This system can effectively meet the need of rapid and accurate strain monitoring, and does not need complex devices such as frequency sweep module. The system has simple structure and high stability, which is of great significance for practical application.
【作者單位】： 閩南師范大學(xué)物理與信息工程學(xué)院;
【基金】：福建省教育廳基金(JB12143) 2012閩南師范大學(xué)校杰青計劃(SJ12001)資助項目
【分類號】：TN911.23

【參考文獻(xiàn)】

相關(guān)期刊論文 前7條

1 賈振安;王虎;喬學(xué)光;尉婷;張嘉慶;;基于分布式光纖布里淵散射的油氣管道應(yīng)力監(jiān)測研究[J];光電子.激光;2012年03期

2 胡佳成;陳福昌;林尊琪;;基于布里淵光時域反射的分布式光纖傳感入侵定位檢測系統(tǒng)[J];光電子.激光;2012年05期

3 宋牟平;鮑，

本文編號：2061758