STANDARDS DEVELOPMENT FOR REMOTE SENSING AT MICROWAVE AND TERAHERTZ FREQUENCIES
James P. Randa, Eyal Gerecht, Dave K. Walker, Amanda Cox, Dazhen Gu, Lixing You, Robert L. Billinger
The Noise Project in the Electromagnetics Division of the National Institute of Standards and Technology (NIST) has proposed the development of standards for microwave brightness temperature, for use in remote-sensing applications such as satellite-based weather observations. The standards would be based on existing fundamental standards for noise in waveguide sysems. The connection to brightness temperature, which is a radiated quantitym would be made by means of a well characterized antenna. A heated calibration target would be used to supplement the basic standard, either as a check or to reduce the unvertainty by a redundant measurement. We have performed preliminary measurements at 26 GHz that demonstate the feasibility of the proposed standard. A parallel effort is in progress for terahertz frequencies. This standard will be used witha terahertz radiometer. The radiometer is based on a reeiver that uses a hot-electron bolometer (HEB) mixer which is coupled to the radiation by a quasi-optical adapter. We expect to perform terahertz noise measurements with the system by the end of the year.
September 5-7, 2007
Digest of 2007 International Conference on Metrology and Measurement
, Gerecht, E.
, Walker, D.
, Cox, A.
, Gu, D.
, You, L.
and Billinger, R.
STANDARDS DEVELOPMENT FOR REMOTE SENSING AT MICROWAVE AND TERAHERTZ FREQUENCIES, Digest of 2007 International Conference on Metrology and Measurement, Beijing, CH, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=32731
(Accessed December 2, 2023)