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为了更好的了解光纤传感原理,并提高温度光纤传感器的各方面性能,提出一种新型的具有波长与强度双解调的光纤温度传感器。将30mm的保偏光纤(PMF)的两端分别与单模光纤(SMF)进行腰椎放大熔接,形成两个腰椎,构成全光纤马赫泽德尔(M-Z)温度传感器。温度的变化将会引起光纤的纤芯模与包层模相位差的变化,从而导致干涉光谱的变化。以25-70℃作为测试温度,通过光谱仪(OSA)监测宽带光源经传感器后的干涉光谱。实验结果表明,温度升高,特征峰波长在向长波长方向移动,并且其强度在逐渐增大。因此,采用波长与强度双解调的方法对温度进行测量,其灵敏度分别为0.127nm/℃和0.32dB/℃,对应的分辨率分别为0.16℃和0.03℃。这个双解调的全光纤温度传感器制造简单、成本低、体积小和结构稳固,而且具有很高的分辨率,因此适用于实际测量。
In order to better understand the principle of optical fiber sensing and improve the performance of various aspects of temperature optical fiber sensor, a novel optical fiber temperature sensor with dual demodulation of wavelength and intensity is proposed. Both ends of a 30mm PMF were magnified and fused with a single mode fiber (SMF) to form two lumbar vertebrae, respectively, to form an all-fiber Mach-Zehnder (M-Z) temperature sensor. Changes in temperature will cause changes in the phase difference between the core and cladding modes of the fiber, resulting in changes in the interference spectrum. Using the spectrometer (OSA) to monitor the interference spectrum of the broadband light source through the sensor with 25-70 ℃ as the test temperature. Experimental results show that when the temperature rises, the characteristic peak wavelength moves in the direction of longer wavelength, and its intensity gradually increases. Therefore, the temperature is measured by the double demodulation method of wavelength and intensity, the sensitivity is respectively 0.127nm / ℃ and 0.32dB / ℃, the corresponding resolutions are 0.16 ℃ and 0.03 ℃ respectively. The dual demodulated all-fiber temperature sensor is simple to manufacture, low cost, small in size and robust in construction and high in resolution, making it suitable for practical measurements.