DETECTORS FOR MILLIMETER RADIATION
Abstract
A study was made of the possibility of the development of phosphor- bronze and partially superconducting metallic bolometers for operation at very low temperatures. Measurements were made of the current-noise power in Ta and leaded phosphor-bronze in the liquid He-temperature region, the noise power being obtained as a function of the frequency of observation from 200 to 4000 c. p.s. No current noise was observed in Ta in the normal or superconducting states at 4.2 deg K. In the intermediate state, when the Ta specimen was maintained partially superconducting in a magnetic field at 4.2 deg K, large current-noise power to the Johnson noise power in Ta in the intermediate state was (n - 1)/1 squared = 15 (ma.) to the -2 power, where n is the ratio between total and Johnson noise powers in the resistor. A tentative explanation is presented on the basis of temperature fluctuations in the specimen. No current noise was observed in the partially superconducting leaded phosphor-bronze specimen, although its resistivity was a marked function of temperature in the 2 deg to 4 deg K range.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1952
- Accession Number
- AD0000013
Entities
People
- Bernard Kaplan
- J. G. Daunt
Organizations
- Ohio State University