单光纤结构的压力传感器.pdf

单光纤结构的压力传感器

(物理科学学院应用物理系刘进)
(学号:2002145015)

【摘要】本文设计了一种单光纤结构的压力传感器及其实验系统。单光纤结构的压力传
感器结构是由单根光纤和一弹性膜片组成,压力变化使得敏感膜发生弹性形变,光纤接收到
的反射光强因此改变,实现光强调制。从光纤光强分布理论出发,通过弹性膜片作为光纤位
移传感器的反射镜物理模型,对影响传感器灵敏度的因素如膜片参数及腔长等进行了理论计
算。对单光纤结构的压力传感器进行了实验研究,并与双光纤压力传感器进行比较。实验结
果表明,单光纤的压力传感器具有适合在微小距离下测量压力,单调性好,灵活性高等特点。
膜片表面的粗糙度会对光强接收有影响,通过对膜片进行镀膜,可以提高了反射率,减小误
差。用单根光纤同时作为发射光纤和接收光纤,不仅可以减少尺寸,还可以解决采用光纤束
存在的死区问题。
【关键词】压力传感器光纤传感器单光纤弹性膜片
【教师点评】论文按照指导教师要求在阅读了相关文献资料之后,参考和引用了与选题
有关的文献资料和最新文献资料;论文选题“单光纤结构的光纤压力传感器”具有一定的理
论价值与实际价值,论文对单光纤结构的光纤压力传感器进行了较为深入的实验研究,具有
一定的学术水平和一定的实用价值;论文观点正确,实验数据可靠,表现出对实际问题有一
定的解决和分析问题的能力;论文结构合理,论述层次符合逻辑,语句通顺,论文写作态度
认真,论文符合本科毕业论文的相关要求。(点评教师:李学金)
(指导教师:李学金)
A Mono-Fiber-Optics Pressure Sensor
【Abstract】 A mono-fiber-optics pressure sensor and its experiment system are designed. It
consists of mono-fiber and an elastic spherical diaphragm. The elastic deformation of the
diaphragm is caused by the pressure, and the reflecting light intensity received by the fiber is
changed, and the modulation of light intensity is figured out. The elastic diaphragm is seen as the
reflector physical model of the fiber-optics displacement sensor, the relationship between the
sensitivity of the sensor and diameters of elastic diaphragm, the distance from terminal of fiber to
the initial diaphragm are calculated based on the light intensity distribution theory. The
mono-fiber-optics pressure sensor is researched based on the experiment, compared with the
double-fiber-optics pressure sensor. According to the result of experiment, the mono-fiber-optics
pressure sensor suit detecting pressure in the tiny distance has good monotony and high flexibility.
The receiving of light intensity is influenced by the roughness of the diaphragm’s surface, plating
can enhance the reflectivity and reduce the error. Using only one fiber-optics as transmitting fiber
and receiving fiber, can diminish the size of sensor and solve the un-detecting-area problem of