Radiant energy – Radiant energy generation and sources – With radiation modifying member
Patent
1994-10-28
1996-10-08
Anderson, Bruce C.
Radiant energy
Radiant energy generation and sources
With radiation modifying member
2504951, 2504931, G01J 100
Patent
active
055634206
ABSTRACT:
A single integrated source of infrared and ultraviolet energy with minimal visible radiation therein. The invention (10) includes a first source of infrared and visible radiation (12) and a second source of ultraviolet and visible radiation (14). In a specific implementation, visible radiation from the infrared source (12) is eliminated by a filter (20) comprising a germanium substrate coated with a thin film multilayer stack. The filtered infrared beam and the ultraviolet beam are combined by a set of mirrors. A cold first mirror (30) directs the ultraviolet energy to a cold second mirror (22) which then transmits infrared energy and reflects ultraviolet energy. The visible radiation from the ultraviolet source is eliminated by transmission through the first cold mirror. The first and second mirrors provide a composite output beam which is collimated by a third mirror (36) and output as a single beam. For safety, a shutter (24) is provided in front of the ultraviolet source (14). The shutter (24) is triggered by a suitably positioned vehicle sensor (26). In addition, a chopper (35) is provided facilitate detection of the output beam. Thus, a beam of both ultraviolet and infrared energy is directed to a single section of an exhaust plume. This enables optimal detection of atmospheric pollutants by a single compact integrated UV and IR sensor head with minimal calibration and signal processing requirements.
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Sullivan M. E.
Thiede D. A.
Walter G. A.
Anderson Bruce C.
Denson-Low W. K.
Santa Barbara Research Center
Schubert W. C.
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