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利用半导体晶体吸收光的波长随温度变化的特性,设计了基于波长调制的新型半导体光纤温度传感系统。使用半导体GaAs材料作为敏感元件,采用了新型反射式结构的传感探头,具有体积小、电绝缘性好和响应快等特点。采用基于CCD衍射解调技术对传感器的反射信号波长进行解调,克服了光强调制解调易受光源抖动和光路扰动影响的缺点,缩短了系统响应时间,扩大了测温范围,提高了系统的测量精度和稳定性。实验分析了不同温度下半导体吸收后的反射光谱,并验证了半导体传感特性。实验结果表明,该系统在0~235℃测温范围内的精度为±0.5℃,分辨率为0.1℃,响应时间小于6 s,长时间稳定性实验的温度最大波动范围为±0.3℃。
A new type of semiconductor optical fiber temperature sensing system based on wavelength modulation is designed by using the characteristics that the wavelength of the semiconductor crystal absorbs light changes with temperature. The use of semiconductor GaAs material as a sensing element, the use of a new type of reflective sensor structure, with small size, good electrical insulation and fast response. The CCD demodulation technology is used to demodulate the wavelength of the reflected signal of the sensor, which overcomes the shortcomings of light intensity modulation and demodulation, such as light source jitter and light path disturbance, shortens the system response time, expands the temperature measurement range and improves the system The measurement accuracy and stability. The reflection spectra of the semiconductor after different temperatures were analyzed experimentally, and the semiconductor sensing characteristics were verified. The experimental results show that the accuracy of the system is ± 0.5 ℃, the resolution is 0.1 ℃, the response time is less than 6 s in the range of 0 ~ 235 ℃, and the maximum fluctuation range of long-term stability test is ± 0.3 ℃.