Accession Number : AD0000013


Title :   DETECTORS FOR MILLIMETER RADIATION


Descriptive Note : Technical rept. 1


Corporate Author : OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS


Personal Author(s) : DAUNT, J G ; KAPLAN, BERNARD


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/000013.pdf


Report Date : 30 Sep 1952


Pagination or Media Count : 39


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.


Descriptors :   *MILLIMETER WAVES , *MILLIMETER WAVE EQUIPMENT , RATIOS , TEMPERATURE , LOW TEMPERATURE , MAGNETIC FIELDS , RESISTANCE , SUPERCONDUCTORS , OBSERVATION , POWER SPECTRA , VARIATIONS , NOISE , RESISTORS , BOLOMETERS , FREQUENCY , METALS


Subject Categories : Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE