Ruggedized gas detector
AssigneeDetector Electronics Corporation
InventorJohn D. King
Life of this patent
Estimating the term…
Abstract
A ruggedized gas detector having two or more perforated concentric cylinders and having a concentric screen inside the innermost cylinder. A pair of perforated tubes are positioned inside the perforated screen, and an infrared light source is placed adjacent one end of one of the tubes and an infrared sensor is placed adjacent the other tube. A pair of inclined mirrors are positioned adjacent the respective other ends of the two tubes, and an optical light path is created from the IR source through a first tube, reflected by the mirrors to a return optical path through the second tube and ultimately to the IR sensor.
Claims10
An apparatus for detecting gas concentrations in a chamber having an optical path therethrough, according to the principle of gas absorption of predetermined infrared wavelengths, comprising:
- a) a first housing having an infrared source and an infrared detector mounted therein;
- b) a second housing having infrared-reflective surfaces therein;
- c) a pair of perforated tubular chambers mounted between said first and second housings, one of said chambers aligned between said infrared source and a reflective surface, and the other of said chambers aligned between said infrared detector and a reflective surface, whereby an optical path is formed from said source to said detector;
- d) an air-permeable screen enclosing said pair of perforated chambers and mounted between said first and second housings;
- e) a first perforated cylinder concentrically positioned about said screen and mounted between said first and second housings;
- and
- f) a second perforated cylinder concentrically positioned about said first perforated cylinder and mounted between said first and second housings.
A gas detector apparatus utilizing an infrared optical path, comprising:
- a) a first housing having an infrared source and an infrared detector;
- b) a second housing having infrared-reflective surfaces, said second housing fixedly positioned relative to said first housing whereby an optical path is formed from said infrared source to said infrared detector by reflection via said infrared-reflective surfaces;
- c) a first perforated cylinder mounted between said first and second housings;
- d) a second perforated cylinder concentrically positioned inside said first perforated cylinder;
- and
- e) an air-permeable cylindrical screen concentrically positioned inside said second perforated cylinder and about said optical path.
Dependencies are inferred from the claim text.