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基于普朗克定律的荧光光纤测温仪,采用蓝宝石光纤作为温度探头,蓝宝石光纤物理化学性能稳定,熔点高(超过2000℃),在0.3～0.4μm波段范围内透光性好,具有光波导的特点,在温度光纤传感和近红外传感等领域有很好的应用前景。利用快速傅里叶变换的拟合方法对荧光寿命进行测量,从第一个非零相的相位角的正切值得出被测的荧光寿命,具有速度快,误差小,不受本底干扰等优点,提高了测量的分辨率。测量范围为0℃～450℃,分辨率达到0.4℃。实验表明该测温仪能有效地消除光源不稳定及测量通道中光强变化对测量结果的影响,具有抗电磁干扰强,测温准确,分辨率高等特点。
Fluorescence fiber thermometer based on Planck’s law, sapphire fiber as temperature probe, sapphire fiber with stable physicochemical properties, high melting point (over 2000 ℃), good optical transmission in the wavelength range of 0.3 ~ 0.4μm, optical waveguide The characteristics of the temperature optical fiber sensing and near-infrared sensing and other fields have good prospects. Fluorescence lifetime is measured by the fitting method of Fast Fourier Transform. The measured fluorescence lifetime is obtained from the tangent of the first non-zero phase phase angle, which has the advantages of fast speed, small error and no background interference , Improve the measurement resolution. The measurement range is 0 ℃ ~ 450 ℃, the resolution reaches 0.4 ℃. Experiments show that the pyrometer can effectively eliminate the instability of the light source and the influence of the light intensity change in the measurement channel on the measurement result, and has the characteristics of strong anti-electromagnetic interference, accurate temperature measurement and high resolution.