CALIBRATION OF SCANNING INTERFEROMETERS

摘要

Calibrating a scanning interferometry imaging system includes: configuring the scanning interferometry imaging system for operation with an interference objective using light having a narrowband wavelength spectrum; using the scanning interferometry imaging system to direct measurement light and reference light along different paths and to overlap the measurement and reference light on a detector, the measurement and reference light having the narrowband wavelength spectrum; scanning an optical path length difference between the measurement light and the reference light at the detector while acquiring intensity data using the detector, the detector acquiring the intensity data at a frame rate and the scanning being performed at a scan speed; determining information about the scan speed based on the acquired intensity data, geometric information about the scanning interferometry imaging system, and the narrowband wavelength spectrum; and calibrating the scanning interferometry imaging system based on the information about the scan speed.