A versatile spectrometer system which uses a pressure-scanned Fabry-Perot and a piezoelectrically-scanned Fabry-Perot in tandem arrangement is described. This system can be used either in synchronous scanning mode where two Fabry-Perots are scanned simultaneously or in band-pass filter mode where the pressure scanned Fabry-Perot is fixed at a frequency and only the piezoelectrically-scanned Fabry Perot is scanned. The former mode is used for the spectroscopy which needs high-resolution in relatively wide frequency region. The latter is suitable for very high-resolution spectroscopy such as precise measurements of Brillouin lines etc.
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Hikita et al. (1987) studied this question.
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