Method and apparatus for monitoring the temperature and velocity

Details Method and apparatus for monitoring the temperature and velocity Method and apparatus for monitoring the temperature and velocity

1991-11-18

1993-01-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Flame light source

25022711, 250425, 21912147, 356 28, G01J 120

Patent

active

051809214

ABSTRACT:
A method and an apparatus for monitoring simultaneously the temperature and the velocity of sprayed particles. The system is comprised of a sensor head attached to the spray gun, an optical fibre transmitting the collected radiation to detection apparatus, and a protective detection cabinet having the detection apparatus that incorporates two detectors. A two-slit or multiple-slit mask is located in the sensor head at the end of the optical fibre. For the temperature measurements, the particle emitted radiation collected by the sensor head is transmitted to two photodetectors, filtered by interference filters at two adjacent wavelengths. The particle temperature may be computed from the ratio of the detector outputs. To measure the velocity, the two-slit system collects radiation emitted by the in-flight particles travelling in the sensor field of view, which generates a double peak light pulse transmitted through the optical fibre. The time delay between these two peaks may be evaluated automatically and the particle velocity computed knowing the distance between the two slit images.

REFERENCES:
patent: 4322165 (1982-03-01), Ellebracht et al.
patent: 5054913 (1991-10-01), Ishikawa et al.

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