Sensor for detection of nitrogen dioxide and nitrogen tetroxide

Details Sensor for detection of nitrogen dioxide and nitrogen tetroxide Sensor for detection of nitrogen dioxide and nitrogen tetroxide

1995-07-05

1996-10-22

Warden, Jill

Chemistry: analytical and immunological testing

Nitrogen containing

422 8205, 422 8206, 422 8209, 422 8211, 422 83, 422 58, 422 88, 436 68, 436167, 436902, 436116, 436117, 25022714, 25022721, 385 12, 385122, 385123, 385141, G01N 2178

Patent

active

055676227

ABSTRACT:
A fiber optic chemical dosimeter system detects the presence of hydrazine fuels and nitrogen tetroxide and nitrogen dioxide gases that are used at rocket launch sites using colorimetric sensors that react selectively with the gases and then absorb laser light communicating through a fiber optic network having a conventional diode laser source transmitting interrogation pulses to a plurality of distributed sensors covering a wide area launch site, the sensor being reactive cladding or distal end types both providing optical reflective returns well suited for reflective near infra-red and visible-red laser interrogation by an optical time domain reflectometry monitor which compares the interrogated laser pulses with sensor returns to determine the extent and location of gas cloud exposures over the distributed wide area.

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