Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Reexamination Certificate
2006-02-13
2010-02-02
Porta, David P (Department: 2884)
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
C250S339130
Reexamination Certificate
active
07655910
ABSTRACT:
A gas concentration measuring apparatus utilizing a gas correlation method capable of measuring concentrations of a plurality of analyte gases simultaneously and at high sensitivity uses an infrared light source (2) such as an infrared semiconductor diode or a quantum cascade semiconductor laser to increase the intensity of collimated infrared light (5) and to lessen infrared light unnecessary for measurement, thereby improving the S/N ratio while achieving a rise in sensitivity. A plurality of analyte gases are simultaneously measured by means of a gas correlation filter comprising a reference gas cell (6a) filled with all of the analyte gases and a plurality of probe gas cells (6b) each individual of which is filled with all such analyte gases other than one of the analyte gases which is of its particular interest.
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Chen Yoshimura LLP
Igyarto Carolyn
Japan Science and Technology Agency
Porta David P
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