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A multiple phase demodulation method for high resolution of the laser scanner

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5 Author(s)
Yoon, Heesun ; Department of Mechatronics, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Republic of Korea ; Yeom, Woosub ; Kang, Seonggu ; Hong, Jinpyo
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To have higher resolution of distance in the laser scanner using the phase demodulation method, signal should be modulated with a high frequency. In the signal processing of modulation and demodulation, it is inevitable to amplify the signals. However, it is not easy to amplify the high frequency since the amplifying gain is restricted by the frequency bandwidth. It is advantageous to demodulate using an intermediate frequency in which high gain amplification as well as less contaminated signal is obtained. Analytical and experimental results are presented to show how the intermediate frequency demodulation method works and how good performance is obtained in the time and frequency domains.

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Review of Scientific Instruments  (Volume:80 ,  Issue: 5 )