Radiant energy – Radiant energy generation and sources – With radiation modifying member
Patent
1987-05-18
1989-02-07
Anderson, Bruce C.
Radiant energy
Radiant energy generation and sources
With radiation modifying member
2504931, 250343, 219548, G01N 2135
Patent
active
048033707
ABSTRACT:
To measure the amount of carbon dioxide in a mixture of gases, a source of infrared light includes a porous getter emitted formed of an inner tungsten heater with a layer of sintered together zirconium and carbon powder covered with spectrographic grade carbon over at least 50 percent of its surface serving as a getter and an emitter of infrared light. It is mounted within a vacuum and emits light in a strong spectrum including light having a bandwidth of at least 150 nanometers with a center point of substantially 4.2 micrometers. The light is transmitted through reference and sample flow cells each including a corresponding one of a reference gas and a sample gas onto a photosensor. The light source includes a reflector located within a range of no more than 1 centimeter from the emitter getter for reflecting heat back to said emitter getter at least 50 percent of its surface and has a window aligned with said infrared light sensor with an opening of area of between 0.05 to 20 square millimeters. The heater heats the emitter getter to a temperature in the range of 600K to 2,000K.
REFERENCES:
patent: 3473022 (1969-10-01), Walz et al.
patent: 4310781 (1987-01-01), Steinhage et al.
patent: 4480191 (1984-10-01), Karpowycz
Anderson Bruce C.
Berman Jack I.
Carney Vincent L.
Li-Cor Inc.
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