| US 7,502,115 B2 | ||
| System and method for high sensitivity optical detection of gases | ||
| C. Kumar N. Patel, Los Angeles, Calif. (US); Michael B. Pushkarsky, Los Angeles, Calif. (US); Michael E. Webber, Culver City, Calif. (US); and Tyson MacDonald, Los Angeles, Calif. (US) | ||
| Assigned to Pranalytica, Inc., Santa Monica, Calif. (US) | ||
| Filed on Nov. 21, 2007, as Appl. No. 11/986,632. | ||
| Application 11/986632 is a division of application No. 11/256377, filed on Oct. 21, 2005. | ||
| Claims priority of provisional application 60/621099, filed on Oct. 22, 2004. | ||
| Prior Publication US 2008/0084561 A1, Apr. 10, 2008 | ||
| Int. Cl. G01J 3/30 (2006.01); G01N 21/00 (2006.01); G02B 6/00 (2006.01) | ||
| U.S. Cl. 356—437 [356/432; 356/317; 250/341.2; 250/339.13] | 16 Claims |
| 1. A gas detector, comprising:
an optical analyzer detecting in a sample of gas optical absorbance of said sample at a plurality of wavelengths, said optical
analyzer transmitting an absorbency signal representative of optical absorbency for each respective one of said plurality
of wavelengths;
said optical analyzer having a selectable sensitivity;
said selectable sensitivity selected according to a first probability that said optical analyzer will transmit a false positive
(PFP) signal for a first gas and a second probability that said optical analyzer will transmit a false negative PFN signal
for said first gas;
a spectral library of gas species absorbing one or more of said plurality of wavelengths including determined absorptions
for expected gases and target gases; and
a processor receiving said absorbency signals and applying pattern recognition with said absorbency signals and said determined
absorptions to provide mole fraction quantities for said expected gases and said target gases; whereby
said sample of gas may be analyzed for presence and quantity of expected gases and target gases.
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