Abstract
A new interference spectrometer for the far-infrared using the method of `selective modulation' is described. This spectrometer consists of two plane mirrors and two identical Ronchi gratings instead of entrance and exit slits. Radiations from the source are transmitted by one grating, reflected back by two mirrors successively and give rise to Young's interference fringes on the other grating. The latter grating vibrates in its own plane and selectively modulates the radiation which produces fringes with the same spacing as that of the slits of this grating. Scanning of the spectrum is carried out by rotating one of the mirrors. Measurements of the atmospheric absorption show that this spectrometer gives the spectrum in the region of 50-250 µm with a constant resolving power of 50 by a single scanning.
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