A fabricated structure of the reference source of infrared radiation resembling radiation of a socalled absolute black body, is described. The setup and procedure for measuring the emissivity factor of this radiation source is described. The emissivity factor of various paints applied to the surface of the reference source is studied.

A prototype of the MTsFS multipurpose Fourier transform spectrometer designed for remote sounding of the Earth’s surface is described. The interferometer that is a part of the spectrometer is based on the double-pendulum scheme and has hollow retroreflectors with an aperture of 2.5”. A 4 × 4 cryogenic CdHgTe array and a pyroelectric detector are used as radiation sensors. The interferometer is equipped with a system for scanning transversely to the flight path with the compensation for image smearing caused by spacecraft movement.

The design of a miniature dynamic interferometer for a Fourier spectrometer is considered. The interferometer is constructed according to the classical Michelson layout. A movable flat mirror in one of the arms of the interferometer is moved using a parallelogram mechanism. A distinctive feature of this design is that almost the entire optical part of the interferometer is located inside this mechanism, which makes the interferometer very compact. A motor driving the motion of a movable mirror is described, in which the force is transmitted to the moving part through a magnetic field. The main advantages of the proposed interferometer are its low cost, easy assembly and alignment, and small size and weight.