Photoacoustic detector

Details Photoacoustic detector Photoacoustic detector

2003-09-19

2010-06-15

Toatley, Jr., Gregory J (Department: 2886)

Optics: measuring and testing

By light interference

For dimensional measurement

C356S501000, C356S498000

Reexamination Certificate

active

07738116

ABSTRACT:
The invention relates to a photoacoustic detector, comprising at least a first chamber (V0) suppliable with a gas to be analyzed, a window for letting modulated and/or pulsed infrared radiation and/or light in the first chamber (V0), and means for detecting pressure variations created in the first chamber by absorbed infrared radiation and/or light. The means for detecting pressure variations created in the first chamber by absorbed infrared radiation and/or light comprise at least an aperture provided in the wall of the first chamber (V0), in communication with which is provided a door arranged to be movable in response to the movement of a gas, and means for a contactless measurement of the door movement. The invention relates also to a sensor for a photoacoustic detector and to a method in the optimization of a door used as a sensor for a photoacoustic detector.

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