Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1999-05-25
2000-07-18
Font, Frank G.
Optics: measuring and testing
For size of particles
By particle light scattering
356338, G01N 1502, G01N 2100
Patent
active
060914947
ABSTRACT:
A particle sensor operates in ambient air at an ambient air temperature and includes (a) a light source projecting a beam of light, (b) a light trap aligned with the beam of light and comprising at least one light-energy-absorbing surface at a surface temperature, (c) a nozzle flowing particle-entraining air through the beam of light, and (d) an opto-electrical system detecting light scattered by a particle. In the improvement, the sensor includes a cooling apparatus in heat transfer relationship to the surface and absorbing heat from such surface. The surface temperature is maintained at or below a value which substantially eliminates thermally-induced electro-optical disturbances in the sensor. A new method for reducing electrical noise detected by an opto-electrical system in the particle sensor includes providing a cooling apparatus in heat transfer relationship to the surface and transferring heat from the surface to the cooling apparatus at a rate which limits the surface temperature to a value which substantially eliminates thermally-induced electro-optical disturbances in the sensor.
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Font Frank G.
Lauchman Layla G.
Venturedyne Ltd.
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