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基于分布反馈式激光器的功率选择特性将波长信息转换为功率值,利用FBG中心波长与温度之间的线性关系,设计了一种基于DFB激光器的FBG功率解调方案,并将其应用于环境温度的监测实验。采用DFB激光器作为系统光源,则FBG的反射光功率将反映其波长改变,通过光电转换、信号放大和滤波将光功率转换为电信号并送入ARM Cortex-M4Kinetis60微控制器。实验结果表明,当环境温度在30℃~60℃升温及降温变化过程中,FBG的反射光功率信号与温度之间的灵敏度可达到0.539 6dBm/℃,线性拟合度为0.970 5,同时,在温度变化范围较小时,系统获得的电信号与FBG温度之间的灵敏度为0.058 3V/℃,线性拟合度为0.958 9,验证了系统方案的可行性。
Based on the power selection characteristic of distributed feedback laser, the wavelength information is converted into the power value. Based on the linear relationship between the central wavelength of FBG and temperature, a DFG laser based FBG power demodulation scheme is designed and applied to ambient temperature Monitoring experiment. Using a DFB laser as a system light source, the reflected light power of the FBG will reflect its wavelength change, which is converted to electrical signals by photoelectric conversion, signal amplification and filtering and sent to an ARM Cortex-M4Kinetis60 microcontroller. The experimental results show that the sensitivity between the reflected optical power signal and the temperature of the FBG reaches 0.539 6dBm / ℃ and the linear fitting degree is 0.9705 when the ambient temperature changes from 30 ℃ to 60 ℃. At the same time, When the temperature range is small, the sensitivity between the system signal obtained and the FBG temperature is 0.058 3V / ℃ and the linear fitting degree is 0.958 9, which verifies the feasibility of the system scheme.