Noise tube sources for the far IR and millimeter region.
The radiant output of a noise tube (C. P. Clare Model TN-167), designed for the 90-140-GHz (3.3-2.1-mm) frequency range, has been compared with that from mercury lamps over the wavelength region from 0.4 to ~6 mm. Lamellar grating and Michelson Fourier transform spectrometers were used in conjunction with He cooled bolometers of NEP from 10(-12) to 10(-14) W/(H(2))(1/2) to measure relative spectral irradiance. With this instrumental arrangement, the radiant power emitted by the noise tube was observed to be less than that from a mercury lamp, at least to a 3-mm wavelength, but it produced less source noise than an ac operated mercury lamp. When the noise tube operating current was reduced, the spectral irradiance peak shifted to longer wavelengths.
Möller
K D
KD
Zoeller
R G
RG
Ugras
N G
NG
Zabiocky
P
P
Heaney
J B
JB
Stewart
K P
KP
Boucarut
R A
RA