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| Wavelength Measurement by Michelson Interferometry Based on Fractional Fourier Transform Signal Processing |
| JIANG Sheng1,WU Jin-min1,LU Ming-feng2,WEI Hong-tao2,FAN Jun-fang1,ZHANG Feng2,TAO Ran2 |
1. School of Automation,Beijing Information Science and Technology University,Beijing 100192,China
2. School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China |
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Abstract The mathematical model of the fringe pattern obtained by Michelson interferometric measurement of wavelength is established, its linear frequency modulation signal (chirp signal) characteristics are revealed, and Michelsonss interferometric fringe processing based on the fractional Fourier transform signal processing method is proposed to realize the laser wavelength measurement. The experimental results show that the proposed wavelength measurement method is feasible. The average relative error of wavelength measurement is about 0.39% for lasers in the wavelength range of 400nm to 635nm. The average relative error in wavelength measurement is still less than 1% when the interferogram is contaminated by Gaussian white noise.
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Received: 19 May 2023
Published: 17 November 2023
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2023, Vol. 44 
