Method and device for precise counting and measuring the particu

Details Method and device for precise counting and measuring the particu Method and device for precise counting and measuring the particu

1997-01-02

1998-06-16

Pham, Hoa Q.

Optics: measuring and testing

For size of particles

By particle light scattering

356339, 356343, 250574, 2504581, G01N 1502

Patent

active

057679673

ABSTRACT:
A device for counting and measuring the particles provides a precise analysis of the particle characteristics and includes an ellipsoidal mirror system, having two different sizes ellipsoidal concentric mirrors (4) and (5) connected towards to each other by their cross-section lateral areas, and a first ellipsoidal mirror (4) is smaller than a second ellipsoidal mirror (5), includes also a light beam and a particulates flow passing inside the first ellipsoidal mirror (4) through a first focus of the first ellipsoidal mirror (4), concurred with a second focus of the second ellipsoidal mirror (5), also includes a light detector (20), which is placed inside the second ellipsoidal mirror (5) at a first focus of the second ellipsoidal mirror (5), concurred with a second focus of the first ellipsoidal mirror (4). An improved device comprises also an electronic control system, including an analog-digital subsystem (45) and a microprocessor subsystem (32), which provide the signal processing and control functions.

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