DEVICE FOR COUNTING PARTICLES
First Claim
1. A device for counting particles comprisinga detector arranged to produce an electrical measurement signal in response to the passage of one or more particles,a comparator arranged to compare the measurement signal with a threshold signal and to increment a counting value when the measurement signal exceeds the threshold signal, anda threshold-adjusting circuit that applies a lowpass filter to the measurement signal, and that is connected to the comparator in order to use the resulting signal as threshold signal.
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Accused Products
Abstract
A device for counting particles comprises a detector arranged to produce an electrical measurement signal in response to the passage of one or more particles, and a comparator arranged to compare the measurement signal with a threshold signal and to increment a counting value when the measurement signal exceeds the threshold signal, characterized in that it furthermore comprises a threshold-adjusting circuit that applies a lowpass filter to the measurement signal, and that is connected to the comparator in order to use the resulting signal as threshold signal.
2 Citations
10 Claims
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1. A device for counting particles comprising
a detector arranged to produce an electrical measurement signal in response to the passage of one or more particles, a comparator arranged to compare the measurement signal with a threshold signal and to increment a counting value when the measurement signal exceeds the threshold signal, and a threshold-adjusting circuit that applies a lowpass filter to the measurement signal, and that is connected to the comparator in order to use the resulting signal as threshold signal.
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9. A method for counting particles comprising:
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a) producing a measurement signal in response to the detection of the passage of one or more particles by a detector; b) producing a mobile threshold signal by applying a lowpass filter of chosen frequency to the signal generated in a); and c) comparing the measurement signal and the mobile threshold signal and emitting a signal indicating the detection of a particle when the measurement signal exceeds the mobile threshold signal by a chosen amount. - View Dependent Claims (10)
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Specification