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Infrared Detector

IP.com Disclosure Number: IPCOM000093784D
Original Publication Date: 1966-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

von Gutfeld, RJ: AUTHOR

Abstract

This infrared detector has the following characteristics. The response This infrared detector has the following characteristics. The response time is of the order of 20-40 nanoseconds. It has compactness. The element responsive to infrared radiation is a film of the order of 2000 Angstroms thick and as small as 0.2 cm. long and 0.002 cm. wide. The detector is very sensitive to radiation in the 10-100 micron range.

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Infrared Detector

This infrared detector has the following characteristics. The response This infrared detector has the following characteristics. The response time is of the order of 20-40 nanoseconds. It has compactness. The element responsive to infrared radiation is a film of the order of 2000 Angstroms thick and as small as
0.2 cm. long and 0.002 cm. wide. The detector is very sensitive to radiation in the 10-100 micron range.

The detector comprises a single crystal, such as a sapphire substrate 2, onto which is vapor deposited a 2000 Angstrom thick film of In-Sn alloy 4, having an area of about 4x 10/-4/cm/2/. A superconductor, such as In-Sn alloy or any other superconductor can be used whose transition temperature is broadened so that the transition occurs over a temperature Delta T approx. 10-40 millidegrees. Such broadening can also be achieved through a variety of evaporation techniques as well as techniques that employ magnetic fields during the operation of the device.

Such device is kept at low temperatures in a liquid helium bath. The bath temperature is controlled by a manostat. Deposited over such alloy film is an alkali-halide layer 6 of the order of 1-3000 Angstroms

A bias current flowing through the film is used to produce a small voltage proportional to the temperature change of the film i. e. its resistance change. Such voltage signals can be amplified and displayed on a suitable indicator such as a cathode-ray tube.

The choice of materials f...