Particle detecting method and storage medium storing program...

Details Particle detecting method and storage medium storing program... Particle detecting method and storage medium storing program...

2008-04-01

2008-04-01

Lauchman, Layla G. (Department: 2877)

Optics: measuring and testing

By particle light scattering

C356S335000, C356S338000

Reexamination Certificate

active

07352461

ABSTRACT:
A particle detecting method which is capable of detecting the number of low-speed particles accurately, and a storage medium storing a program for implementing the method. Intensity of scattered light generated when a light emitted into a gas stream is scattered by a particle is measured using a light receiving sensor at predetermined time intervals. A measuring time period for measuring the scattered light intensity is divided into measurement periods each defined as a predetermined time period, and a measured time point in each measurement period is selected at which a maximum value of the scattered light intensity measured is measured. The number of particles having passed by in front of the light receiving sensor is counted based on the measured time point selected in each measurement period.

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