Particle monitoring sensor

Details Particle monitoring sensor Particle monitoring sensor

1993-07-08

1995-10-31

Rosenberger, Richard A.

Optics: measuring and testing

By particle light scattering

With photocell detection

G01N 2185

Patent

active

054634601

ABSTRACT:
An improved particle monitoring sensor is described which uses a variety of techniques to prolong the effective life of the optical surfaces within the particle monitoring sensor. Substantially inert purging gas is directed over the particle monitoring sensor windows, which are normally exposed to a harsh operating environment. The surfaces of these windows are heated by heating elements in direct thermal contact with the windows. In addition, a restrictive slit is placed over the detector window to reduce the exposed area and to increase the velocity of gas flowing over the window surface. While this slit reduces the detector's field of view, the signal loss is reduced by using a linearly polarized light source and aligning the elongated slit's major axis with the direction of polarization.

REFERENCES:
patent: 3495259 (1970-02-01), Rocholl et al.
patent: 3901602 (1975-08-01), Gravatt
patent: 4355861 (1987-10-01), Sebold
patent: 5083865 (1992-01-01), Kinney et al.

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