Computer Science – Performance
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.356..125s&link_type=abstract
In ESA, Proceedings of an ESA Symposium on Photon Detectors for Space Instrumentation p 125-128 (SEE N94-15025 03-19)
Computer Science
Performance
Light (Visible Radiation), Photometers, Photons, Quantum Efficiency, Radiation Counters, Astronomy, Performance Tests, Systems Engineering
Scientific paper
The demonstration of Visible Light Photon Counters (VLPCs) with a counting quantum efficiency of 60% is reported. A quantum efficiency in excess of 85% should be achievable with optimization. With such high photon detection efficiencies, the VLPC can have many applications in astronomy. Performance characteristics of this type of device are described and compared with other types of existing photon counters. Present devices operate best at a temperature of 6 to 7K. Due to the high and fast internal gain in the VLPC, the signal from a single detected photon is well above noise and can be monitored through simple readout circuitry. Compact multichannel cassettes which provide convenient optical inputs to line arrays of VLPCs and ease electrical readout from the arrays were designed. By inserting these cassettes into an efficient cryostat of simple design, the cassette could be cooled down rapidly to operating temperatures to evaluate VLPCs for various applications. Operation of the cassette and cryostat is described.
Bharat Ravi
Petroff Michael D.
Stapelbroek Maryn G.
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