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基于血浆吸收光谱拟合处理诊断食管癌研究

ISSN号：1671-6841
期刊名称：郑州大学学报(理学版）
时间：2014.9.15
页码：59-62
分类：TN911.23[电子电信—通信与信息系统;电子电信—信息与通信工程] TU317[建筑科学—结构工程]
作者机构：[1]College of Physics and Electronics Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China, [2]Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China, [3]Shanghai S ynet Optics Technology Corporation, Shanghai 201203, China.
相关基金：Project supported by the National High Technology Research and Development Program of China （Grant No. 2012AA041203）, the National Natural Science Foundation of China （Grant Nos. 61377062 and 31201377）, the Program of Shanghai Excellent Technical Leaders, China （Grant No. 13XD 1425400）, and the Doctorial Fund of Zhengzhou University of Light Industry, China （Grant No. 2013BSJJ012）.
相关项目：温压条件下食用植物油光学性质和流变特征研究

关键词：布里渊光时域反射计, 单脉冲跟踪, 相干检测, BOTDR, 检测技术, 时域信号, 频率波动, 数据采集卡, Brillouin optical time domain reflectometry, digital coherent detection, simplex pulse codes,signal-to-noise ratio

中文摘要：

The digital coherent detection technique has been investigated without any frequency-scanning device in the Brillouin optical time domain reflectometry(BOTDR), where the simplex pulse codes are applied in the sensing system. The time domain signal of every code sequence is collected by the data acquisition card(DAQ). A shift-averaging technique is applied in the frequency domain for the reason that the local oscillator(LO) in the coherent detection is fix-frequency deviated from the primary source. With the 31-bit simplex code, the signal-to-noise ratio(SNR) has 3.5-dB enhancement with the same single pulse traces, accordant with the theoretical analysis. The frequency fluctuation for simplex codes is 14.01 MHz less than that for a single pulse as to 4-m spatial resolution. The results are believed to be beneficial for the BOTDR performance improvement.

英文摘要：

The digital coherent detection technique has been investigated without any frequency-scanning device in the Brillouin optical time domain reflectometry （BOTDR）, where the simplex pulse codes are applied in the sensing system. The time domain signal of every code sequence is collected by the data acquisition card （DAQ）. A shift-averaging technique is applied in the frequency domain for the reason that the local oscillator （LO） in the coherent detection is fix-frequency deviated from the primary source. With the 31-bit simplex code, the signal-to-noise ratio （SNR） has 3.5-dB enhancement with the same single pulse traces, accordant with the theoretical analysis. The frequency fluctuation for simplex codes is 14.01 MHz less than that for a single pulse as to 4-m spatial resolution. The results are believed to be beneficial for the BOTDR performance improvement.

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