Signal Processing Algorithms for Doppler Effect Based Nanometer Positioning Systems
Resource
Japanese Journal of Applied Physics 38 Part1 (3B): 1725-1729
Journal
Japanese Journal of Applied Physics
Journal Issue
38
Pages
Part-1
Date Issued
1999
Date
1999
Author(s)
Abstract
Interferometers based on laser Doppler effect are used as the vehicle to examine the cross relationship and performance impact among sub-systems such as optical layout, mechanical layout, signal processing algorithm, and signal processing circuitry. The classification of interferometers into the three main categories (e.g. homodyne, heterodyne and quadrature) and their influence on signal processing algorithms and circuitry which impact interferometer performance is examined. A quadrature configuration, found to have some unique advantages, is detailed. Also presented is an experimental laser encoder set-up equipped with a real-time signal processing circuitry based on a high performance field programmable gate array (FPGA) circuitry with a PC interface for quadrature signal decoding that was constructed to verify the quadrature configuration presented. The experimental data obtained that verifies how this new system architecture can fulfill the stringent demands of today's high performance, high accuracy metrology systems is also examined. ©1999 Publication Board, Japanese Journal of Applied Physics.
Subjects
Doppler interferometers; FPGA; Frequency decoding; Heterodyne; Homodyne; Phase decoding; Quadrature
Other Subjects
Algorithms; Anemometers; Decoding; Doppler effect; Field programmable gate arrays; Heterodyning; Interfaces (computer); Interferometers; Signal encoding; Encoding (symbols); Laser applications; Signal processing; Homodyning; Laser Doppler anemometers (LDA); Phase decoding; Frequency decoding; Laser Doppler interferometers; Optical disk storage; Interferometers
Type
journal article
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