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提出了一种基于强度检测的包层模谐振特种光纤传感系统。包层模谐振特种光纤是一种新型的传感元件,对折射率和弯曲等物理量十分敏感。利用它的光谱滤波特性,结合分布式反馈激光器的窄带光谱,可将传感参量改变而引起的光谱移动,最终转化为光强度的变化。在该传感系统中设置了参考光路,抑制了光源波动对实验结果的影响。分析了传感系统中其他影响传感精度的因素。这种方法基于光强度的测量,采用全光设计,无需机械部件调谐,具有方法简单、成本低廉等优点。通过实验,实现了0.0005 R.I.U.(单位折射率)的解调精度。
A kind of cladding mode resonant special optical fiber sensing system based on intensity detection is proposed. Clad mode-mode resonant special fiber is a new type of sensing element that is very sensitive to physical quantities such as refractive index and bending. Utilizing its spectral filtering characteristics, combined with the narrowband spectrum of the distributed feedback laser, the spectral shift caused by the change of the sensing parameters can be finally transformed into the change of light intensity. The reference light path is set in the sensing system, which suppresses the influence of light source fluctuation on the experimental results. The other factors affecting the sensing accuracy in the sensing system are analyzed. This method is based on the measurement of light intensity, the use of all-optical design, without mechanical components tuning, with the method is simple, low cost and so on. Through experiments, the precision of 0.0005 R.I.U. (unit refractive index) demodulation has been achieved.