27 April 1988 Flight Worthy Infrared Bolometers With High Throughput And Low NEP
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Abstract
The Far Infrared Absolute Spectrometer (FIRAS) and Diffuse Infrared Background Experiment (DIRBE) instruments on the Cosmic Background Explorer (COBE)1 mission require bolometers with a relatively short time constant, high throughput, and low NEP. At the same time these detectors must be flight worthy and have very small microphonic response. None of the bolometers available at the beginning of the program, either monolithic or composite, met all of the above requirements. Therefore, the Goddard Space Flight Center developed composite bolometers in-house that meet the stringent requirements of COBE. Small chips of doped and compensated silicon are used as sensing elements. The absorbing substrate consists of diamond wafers coated with thin layers of chromium and gold. Maximum IR absorptance is accomplished by controlling the total surface resistance of these layers. The throughput for the FIRAS bolometers is 1.28 sr-cm2, while for DIRBE it is 0.21 sr-cm2. At 1.6 K, the time constants range from 3 to 40 ms and their NEP range from 4x10-15 to 1x10-14 W/Hz1/2. The noise spectra of these bolometers are flat above 1 to 2 Hz.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Aristides T Serlemitsos, "Flight Worthy Infrared Bolometers With High Throughput And Low NEP", Proc. SPIE 0973, Cryogenic Optical Systems and Instruments III, (27 April 1988); doi: 10.1117/12.948379; https://doi.org/10.1117/12.948379
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