井下流体光纤在线光谱分析仪关键技术  

Key Techniques of On-Line Optical Fiber Spectrum Analyzer for Down-Well Fluid

作　　者：宣海锋[1] 廖延彪[1] 赖淑蓉[1] 张敏[1] 

机构地区：[1]清华大学电子工程系光纤传感实验室,北京100084

出　　处：《中国激光》2005年第8期1105-1109,共5页Chinese Journal of Lasers

基　　金：国家863计划(2001AA602011-1)资助项目。

摘　　要：利用离散光谱法实现了可应用于井下原油在线成分分析的光纤在线测量系统。给出井下流体的光谱测量的基本原理以及建立还原模型的基本算法。传统的全谱测量方式很难满足井下应用要求,为此提出了波长选择算法以简化传统光谱测量系统设计。该波长选择算法以全光谱数据为基础进行波长筛选,最终选取了11个特征光谱来代替传统的全谱扫描。以测得的吸收谱线为基础进行模型精度实验,实验表明利用离散光谱点建立还原模型和利用全光谱建立的模型具有很好的一致性。采用离散光谱法简化了系统结构,并可应用于井下在线分析。该系统可同时对井下油、气、水进行检测,也能对原油和油基钻井泥浆混合物进行在线测量,测量误差仅为2%。An on-line down-well fluid optical spectrum analyzer was presented, which can be applied to the component measurement of down-hole fluid including oil, water and gas. The principle of near infrared （NIR） spectral measurement of oil and regression method of the system are pesented. Instead of full spectrum analyzing, a discrete spectrum selecting technique was adopted. The discrete-spectrum-selecting algorithm was presented to simplify the design of conventional spectrum analysis system. By the discrete-spectrum-selecting algorithm, the system can be designed in small size and compact structure. The experimental results showed that the accuracy of the model using discrete wavelength is consisted with that of using the all wavelengths and the measurement accuracy of 98 % was achieved。

关 键 词：仪器 近红外光谱 离散光谱法 光纤在线测量 

分 类 号：TN247[电子电信—物理电子学]