Particle Counter
AssigneeRion Co., Ltd.
InventorsYasutaka Nakajima, Tomonobu Matsuda
Life of this patent
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Abstract
A particle counter for measuring the number of floating particles contained in a sample to determine the particle concentration therein includes: a memory section for storing a relational expression between the direct current level output from a photoelectric converter when no particles exist and the frequency of occurrence of false counts; and a subtraction section for determining the frequency of occurrence of the false counts corresponding to the direct current level output from the photoelectric converter at the time of commencement of measurement with reference to the relational expression stored in the memory section and subtracting a value based on the frequency of occurrence of the false counts from a discrete value after commencement of measurement.
Claims4
A particle counter for measuring the number of floating particles contained in a sample to determine the particle concentration therein comprising:
- a memory section for storing a frequency of occurrence of pre-calculated false counts;
- and
- a subtraction section for subtracting a value based on the frequency of occurrence of false counts stored in the memory section from a discrete value after commencement of measurement.
A particle counter for measuring the number of floating particles contained in a sample to determine the particle concentration therein comprising:
- a memory section for storing a relational expression between a direct current level output from a particle detecting section when no particles exist, and a frequency of occurrence of false counts;
- and
- a subtraction section for determining the frequency of occurrence of false counts corresponding to a direct current level output from the particle detecting section at the time of commencement of measurement with reference to the relational expression stored in the memory section, and subtracting a value based on the frequency of occurrence of the false counts from a discrete value after commencement of measurement.
Dependencies are inferred from the claim text.