Study of Fourier transform spectrometer based on Michelson interferometer wave-meter

Yuexiang Peng; Liqiang Wang; Li Lin

doi:10.1117/12.754741

4 January 2008 Study of Fourier transform spectrometer based on Michelson interferometer wave-meter

Yuexiang Peng, Liqiang Wang, Li Lin

Proceedings Volume 6837, Information Optics and Photonics Technologies II; 68370T (2008) https://doi.org/10.1117/12.754741
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

A wave-meter based on Michelson interferometer consists of a reference and a measurement channel. The voice-coiled motor using PID means can realize to move in stable motion. The wavelength of a measurement laser can be obtained by counting interference fringes of reference and measurement laser. Reference laser with frequency stabilization creates a cosine interferogram signal whose frequency is proportional to velocity of the moving motor. The interferogram of the reference laser is converted to pulse signal, and it is subdivided into 16 times. In order to get optical spectrum, the analog signal of measurement channel should be collected. The Analog-to-Digital Converter (ADC) for measurement channel is triggered by the 16-times pulse signal of reference laser. So the sampling rate is constant only depending on frequency of reference laser and irrelative to the motor velocity. This means the sampling rate of measurement channel signals is on a uniform time-scale. The optical spectrum of measurement channel can be processed with Fast Fourier Transform (FFT) method by DSP and displayed on LCD.

Citation Download Citation

Yuexiang Peng, Liqiang Wang, and Li Lin "Study of Fourier transform spectrometer based on Michelson interferometer wave-meter", Proc. SPIE 6837, Information Optics and Photonics Technologies II, 68370T (4 January 2008); https://doi.org/10.1117/12.754741

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