A controlling unit has been developed to bring the plates of a piezoelectrically scanned Fabry–Perot into parallelism, and keep them parallel for long periods. Using feedback from the transmitted signal with repeated scans stored in a multichannel analyzer, spectra of several hours duration may be obtained. The controller is directly compatible with a commercial ramp generator and has a total materials cost of $300.
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D. Bechtle (1976) studied this question.
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