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Proceedings Paper

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

Paper Details

Date Published: 4 January 2008
PDF: 8 pages
Proc. SPIE 6837, Information Optics and Photonics Technologies II, 68370T (4 January 2008); doi: 10.1117/12.754741
Show Author Affiliations
Yuexiang Peng, Beijing Univ. of Technology (China)
Liqiang Wang, Tianjin Univ. of Technology and Education (China)
Li Lin, Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 6837:
Information Optics and Photonics Technologies II
Guoguang Mu; Feijun Song; Francis T. S. Yu; Suganda Jutamulia, Editor(s)

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