Browse Prior Art Database

Cryogenic Detector

IP.com Disclosure Number: IPCOM000097296D
Original Publication Date: 1962-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Tansal, S: AUTHOR [+2]

Abstract

The attenuation and the reflection of waves in a superconducting transmission line are dependent upon the amount of current flowing in the circuits which are in close proximity to the transmission line. This is because the amount of current flowing in these lines affects the penetration depth of the transmission line.

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Cryogenic Detector

The attenuation and the reflection of waves in a superconducting transmission line are dependent upon the amount of current flowing in the circuits which are in close proximity to the transmission line. This is because the amount of current flowing in these lines affects the penetration depth of the transmission line.

Superconducting transmission line L is in the form of a closed loop. Transmission line L is made of a material such as indium alloy, the penetration depth of which is appreciably affected by the applied magnetic field. Line L has a pulse generating input P.

Three circuits A, B and C are positioned in the vicinity of L. The magnetic field generated by current in either one of the circuits A, B or C changes the penetration depth of L and changes the attenuation of signals in it. Once a pulse is established in line L, it continues circulating with slight dispersion until a discontinuity is introduced into the line. Such a discontinuity is introduced by current in any one of the circuits A, B or C.

A straight superconducting transmission line, open at its receiving end, can also be used for detection purposes by having several circuits, the states of which are to be detected, positioned along the line and by determining the states of these circuits by the magnitude of the reflected pulse. A synchronous scheme can be provided by using two transmission lines activated by the same source. A signal on one of the transmission lines is used...