| 摘要 |
A wavelength-variable light source is configured to emit a light with a wavelength (lambda), which is variable within a scan width (Deltalambda). An interferometer has a coherent length (DeltaL), which is determinable from (Deltalambda) and (lambda). A controller determines an appropriate magnitude of the scan width (Deltalambda) while a CCD camera captures a fringe image in an exposure time (Te), which is set longer than a time for wavelength scanning.
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