FOURIER-TRANSFORM SPECTROMETER CONFIGURATION OPTIMIZED FOR SELF EMISSION SUPPRESSION AND SIMPLIFIED RADIOMETRIC CALIBRATION

摘要

A beamsplitter for a double beam interferometer with the interferometer and beamsplitter being designed to provide suppression of the interferometer's self emissions by optical substraction. The beamsplitter is formed of two flat transparent substrates having balanced transmission characteristics at the wavelengths of interest. These substrates are superposed and mounted next to each other with a thin layer of air squeezed between adjacent flat surfaces of the substrates. A temperature sensor on a mount in which the beamsplitter is installed allows for simplified radiometric calibration of the interferometer.