Boots – shoes – and leggings
Patent
1981-10-05
1984-08-21
Krass, Errol A.
Boots, shoes, and leggings
250339, 250374, 356 51, 364499, 364571, 364572, G01N 2126
Patent
active
044674350
ABSTRACT:
An improved nondispersive infrared gas analyzer having at least one pneumatic or Luft-type detector and at least one black body type detector located one behind the other along the optical axis of the analyzer. In the preferred embodiment, a black body detector is exposed to radiation from a sample cell through an intervening pneumatic detector. The pneumatic detector absorbs radiation at specific infrared wavelengths, while the black body detector absorbs radiation substantially uniformly at all wavelengths. Signals from the pneumatic detector and the black body detector are combined electronically in an improved signal processing circuit to provide an output signal that is substantially free of the effects of disturbing influences such as infrared source intensity variations, mechanical vibrations and shock, and the presence of interfering compounds.
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Cederstrand Carl N.
Warnke Dale F.
Beckman Instruments Inc.
Harder P. R.
Jason E. C.
Krass Errol A.
Steinmeyer R. J.
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