Particle size analyzer
First Claim
1. A particle size analyzer comprising:
- a crossed beam laser anemometer that produces a non-contacting probe formed of a series of fringes that produce blinking scattered light when a particle passes transversely through the series of fringes, detects the blinking scattered light produced by particles passing through said fringes and produces a fluctuating output signal having a magnitude related to the magnitude of the light scattered by particles passing through said fringes;
analyzing means for;
(a) receiving the fluctuating output signal of said crossed beam laser anemometer;
(b) verifying that a particle causing a fluctuating output signal has passed through a number of fringes of said probe above a predetermined number; and
(c) producing a coded output signal if the particle causing said fluctuating output signal has passed through said number of fringes, said coded output being a function of the magnitude of said fluctuating output signal;
storage means, including a plurality of data bins, for;
(a) receiving said coded output of said analyzing means;
(b) reading out the data stored in a particular data bin each time a coded output occurs;
(c) changing said data; and
(d) writing the changed data back into the same data bin; and
,readout means connected to said storage means for sequentially reading out the data stored in said data bins.
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Accused Products
Abstract
A particle size analyzer that measures the intensity of light scattered by moving particles passing through the probe of a crossed beam laser anemometer, verifies that the measured signal was produced by a particle passing through a region near the center of the probe, and stores count values related to the number of particles producing the same scattered light intensity value is disclosed. Since scattered light intensity values are related to particle size, the stored count values equal the number of particles of the same size detected by the analyzer. In the preferred form of the invention, the measured light intensity determines the address of a particular intensity bin of a storage system. After verification to determine if a measured intensity value was produced by a particle passing through a region near the center of the probe, the count value stored in an intensity bin related to the measured value is updated by one. When any bin reaches the maximum value that can be stored therein, the particle light intensity measuring mode of operation ends and the particle size analyzer is placed in a readout mode of operation. In the readout mode of operation, the intensity bin count values are sequentially read out, converted into analog form, and displayed.
63 Citations
16 Claims
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1. A particle size analyzer comprising:
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a crossed beam laser anemometer that produces a non-contacting probe formed of a series of fringes that produce blinking scattered light when a particle passes transversely through the series of fringes, detects the blinking scattered light produced by particles passing through said fringes and produces a fluctuating output signal having a magnitude related to the magnitude of the light scattered by particles passing through said fringes; analyzing means for;
(a) receiving the fluctuating output signal of said crossed beam laser anemometer;
(b) verifying that a particle causing a fluctuating output signal has passed through a number of fringes of said probe above a predetermined number; and
(c) producing a coded output signal if the particle causing said fluctuating output signal has passed through said number of fringes, said coded output being a function of the magnitude of said fluctuating output signal;storage means, including a plurality of data bins, for;
(a) receiving said coded output of said analyzing means;
(b) reading out the data stored in a particular data bin each time a coded output occurs;
(c) changing said data; and
(d) writing the changed data back into the same data bin; and
,readout means connected to said storage means for sequentially reading out the data stored in said data bins. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification