Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Reexamination Certificate
2011-08-23
2011-08-23
Porta, David P (Department: 2884)
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
Reexamination Certificate
active
08003945
ABSTRACT:
An NDIR gas sensor is housed within a mechanical housing made up of a can and a header housing. The header housing body contains a tunnel waveguide sample chamber. The header housing also has a top surface with a pair of windows formed in it and a signal detector, a reference detector, a MEMS source and a signal processor mounted to it. The can has inner reflective surfaces and the reference detector and the signal detector are affixed to the top surface so that the inner reflective surfaces of the can and the tunnel waveguide sample chamber create a signal channel path length detected by the signal detector that is greater than a reference channel path length detected by the reference detector and an absorption bias between the signal and reference outputs can be used to determine a gas concentration in the sample chamber. Both the signal detector and the reference detector have an identical narrow band pass filter with the same Center Wavelength (“CWL”), Full Width Half Maximum (FWHM) and transmittance efficiency at the CWL.
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Anderson Roy L
Porta David P
Sung Christine
Wagner, Anderson & Bright, P.C.
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