基于非线性AgGaSe_2晶体的光纤SO_2传感器  

A Novel SO_2 Optical Fiber Sensor Based on Nonlinear Crystal AgGaSe_2

作　　者：王玉田[1] 郭增军[1] 王莉田[1] 

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《半导体光电》2001年第5期354-356,共3页Semiconductor Optoelectronics

基　　金：河北省自然科学基金资助项目 (6 0 0 2 2 7)

摘　　要：根据SO2 气体的吸收光谱 ,选择波长为 12 68nm的单极性半导体激光器和波长为10 83nm的分布反馈式半导体激光器 ,经光纤耦合作为泵浦光并通过周期性极化的AgGaSe2 晶体叠加 ,产生对SO2 具有强吸收的 7.4 μm连续差频光 ,研制出一种光纤传感器 ,实现了对二氧化硫气体的检测。该传感器具有检测灵敏度高、稳定性好、结构简单及可在线测量等特点。实验结果表明 ,这种传感器的检测灵敏度为 7 5× 10 - 4。Based on absorptive spectrum of SO 2 gas, an infrared SO 2 sensor is investigated using a room temperature laser diode(LD) as light source. A continuous wave difference frequency light is generated near 7.4 μm by selecting a 1 268 nm monopolarized LD and a 1 083 nm distributed feedback(DFB) LD as pumping source by fiber conpling, and by means of superimposition of periodically polarized AgGaSe 2. An intrinsic absorptive optical fiber sensor is thus realized for detection of SO 2. The sensibility of this method is up to 7 5×10 -4 . This kind of sensor has such advantages as high sensitivity, good reliability, and simple configuration on which on line detection can be performed.

关 键 词：半导体激光器 光纤传感器 二氧化硫 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]