Non-dispersive ir measurement of gases using an optical filter

Details Non-dispersive ir measurement of gases using an optical filter Non-dispersive ir measurement of gases using an optical filter

2006-08-15

2006-08-15

Gabor, Otilia (Department: 2878)

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

C250S339120

Reexamination Certificate

active

07091487

ABSTRACT:
A method and apparatus for determining the safety of a gas mixture containing flammable components such as methane together with ethane or other hydrocarbon, together with a diluent gas. The method includes the filtered infrared spectroscopy of the gas mixture in a gas cell using a filter. The peak transmission wavelength and bandwidth of the filter are so chosen to provide an output, when an infrared light source having a flat wavelength distribution is used, indicative of the % LEL of the gas mixture, within a predetermined tolerance. The filter may be a gas correlation filter containing a mixture of methane and ethane, together with a diluent gas.

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NDC Infrared Engineering: “Narrow Bandpass Filters type NBP”, 2000, http://www.ndc.com/products
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H. I. Coward et al, Limits of Flammability of Gases and Vapours, Pub. 1952, National Bureau of Mines Bulletin 5C3, pp. 5-9.

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