Abstract
A high precision demodulation method based on least squares fitting for expanding the temperature measurement range of the fiber Lyot filter has been proposed and experimentally demonstrated. And a compact reflective Lyot filter has also been proposed to verify this method. The filter consists of a polarizer and a section of polarization maintaining fiber (PMF) coated with a gold film at the end. The birefringence of the PMF can be obtained through the least squares method, so that the temperature measurement range is not limited to the free spectral range (FSR) of the periodic interference spectrum. Experimental results show that the proposed method can extend the measurement range by 5.5 times compared to the dip wavelength tracking method. And the demodulation fluctuation of the birefringence is within 10 -7 .
Highlights
The research on optic fiber temperature sensors with large measurement range and high precision characteristics is of great significance in the fields of aerospace, healthcare and industrial production [1], [2]
We propose a high precision demodulation method for expanding the temperature measurement range of the fiber Lyot filter
In conclusion, a birefringence demodulation method based on least squares algorithm has been proposed for expanding the temperature measurement range of the Lyot filter
Summary
The research on optic fiber temperature sensors with large measurement range and high precision characteristics is of great significance in the fields of aerospace, healthcare and industrial production [1], [2]. Most of them are demodulated by the dip wavelength tracking method, so the measurement range is limited by FSR of the interference spectrum. W. Li et al.: Highly Precise Birefringence Demodulation to Overcome the Sensing Limitation From the FSR on the Fiber Lyot Filter highly sensitive to temperature [20]. We propose a high precision demodulation method for expanding the temperature measurement range of the fiber Lyot filter. The least squares method is utilized to demodulate the birefringence of the polarization maintaining fiber (PMF) in the filter, so that the temperature demodulation range is not limited by the FSR of the interference spectrum, thereby expanding the temperature measurement range by 5.5 times. A new reflective Lyot filter composed of a polarizer and a PMF coated with gold film has been proposed to make the temperature sensor more compact and practical
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