Detector system with cryogenic semiconductor and superconductor bolometers

Abstract

The design and characteristics are reported of a two-channel receiving device based on a semiconductor (Ge:Ga) and a superconductor (Pb+Sn) bolometers operating at deep cooling. The device is intended to detect radiation in the spectral region 50 to 500 μm at the aperture ratio 1:6 and the input hole of the field system 7 mm in diameter. The semiconductor composite bolometer has a noise equivalent power (NEP) of 3·10 −13 WHz − 1 2 at the response time 2·10 −3 s and the helium-bath temperature 1.34 K, and the superconductor one 2.1·10 −12 WHz − 1 2 at 3·10 −6 s and 4.23 K, respectively.