Publication Date:
2019-07-12
Description:
Three techniques, flow modulation, filament modulation, and reactive-filter modulation developed to obtain selective response to hydrazine or to methyl hydrazines from photoionization detector. Implemented in portable selective hydrazine detectors, useful where continuous or rapid, repetitive quantitative measurements of concentrations of vapors of these toxic substances required. Measure concentration of gaseous hydrazines in presence of other gases like cyclohexane, chlorofluorocarbons, and ammonia. Produce modulated signal, amplitude and phase indicating amount of hydrazine, monomethyl hydrazine, or 1,1-dimethyl hydrazine present in mixture. Used with such other detectors as electrochemical cells.
Keywords:
PHYSICAL SCIENCES
Type:
KSC-11520
,
NASA Tech Briefs (ISSN 0145-319X); 16; 11; P. 74
Format:
text
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