Accession Number : AD0462729


Title :   NEAR FIELD INFRARED BACKGROUND NOISE SIMULATION


Descriptive Note : Interim engineering rept. Feb-Oct 1964


Corporate Author : MITHRAS CAMBRIDGE MA


Personal Author(s) : Adams, Richard H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/462729.pdf


Report Date : Jan 1965


Pagination or Media Count : 64


Abstract : Studies on the near field infrared background noise problem were directed toward the simulation of the infrared noise emanating from a known turbulent zone. A laboratory tool for simulating the near field noise has been designed, utilizing a simple heated round free subsonic jet as the infrared noise generator. A review of the characteristics of the hot free subsonic jet is presented and the design of the near field infrared background simulator is described. Preliminary measurements of the fluctuations in radiant emittance from the jet have been made with an AC radiometer. The data were reduced to normalized spectral density curves. The spectral density curves exhibit a more rapid decrease in energy level with increasing frequency than do spectral density curves obtained from hot wire measurements.


Descriptors :   *BACKGROUND NOISE , INFRARED RESEARCH , WATER , HIGH TEMPERATURE , POWER SPECTRA , CALIBRATION , NOISE , RADIOMETERS , CARBON DIOXIDE , JET FLOW , NEAR FIELD , INFRARED SPECTRA , SPIKES , SIMULATION , DENSITY


Subject Categories : Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE