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US3887868A
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US
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Measuring device for determining the concentration and the mean particle size of particles suspended in an electrolytically conductive liquid
Assignee: Rheinmetall Air Defence AG
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Filing: 1973-09-04
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Granted: 1975-06-03
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Expires: 1993-09-04
Abstract
Abstract A measuring device for determining the concentration and mean volume of particles suspended in an electrolytically conductive liquid, comprising a conductivity cell having a capillary restriction and incorporating means for generating pulses upon passage of the particles suspended in the liquid through said conductivity cell. A circuit is operatively connected with the conductivity cell for evaluating and counting the pulses. This circuit incorporates pulse counter means for counting pulses generated by the particles passing through the conductivity cell, and auxiliary counter means for counting a predetermined number of the pulses produced by the particles, means for determining the mean particle volume, and means for correction of the determined mean particle volume to correct the same to provide an indication of the actual mean particle volume while taking into account the probability of simultaneous throughpassage of more than one particle through the capillary restriction of the conductivity cell.
Inventors
- 👤 Walter Guggenbuhl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:12
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/10; G01N15/1031; G01N15/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
298 words
An apparatus for measuring the mean volume of a multiplicity of particles contained in an electrolytically conductive suspension liquid, comprising, in combination: a. means defining a capillary restricted measurement path arranged between two electrodes; b. a particle detector device incorporating means for propelling the suspension liquid through the capillary restricted measurement path; c. pulse generator means for generating for each particle which passes through the measurement path a particle pulse with a peak amplitude proportional to the particle volume; d. a particle pulse counting mechanism for indicating the sum of the particles contained in a predetermined volume of suspension liquid; e. pulse counting and selection means for converting only such particle pulses which, with regard to a preceding particle pulse possesS a minimum spacing in time, into square wave pulses of appropriate peak amplitude and predetermined nonvariable duration; f. a square wave pulse integration mechanism for the integrating charging of a capacitance to a final voltage which is proportional to the peak amplitude summation of all integrated square wave pulses; g. an auxiliary counting mechanism for counting all integrated square wave pulses until reaching a predetermined final numerical value; h. means for the automatic placing into standstill the integration operation of the integration mechanism upon reaching a predetermined final counter state of the auxiliary counter mechanism and for connecting the capacitance to a discharge current circuit upon termination of the counting function of the particle pulse counting mechanism; i. means for the automatic parallel circuit connection of additional conductance values at a basic conductance value of a discharge current circuit in functional dependency of the attained counter state of the particle pulse counter mechanism; and j. means for measuring the discharge time of the capacitance as an actual time value which is proportional to the mean particle volume.
Claim 2
Independent Claim
298 words
An apparatus for measuring the mean volume of a multiplicity of particles contained in an electrolytically conductive suspension liquid, comprising, in combination: a. means defining a capillary restricted measurement path arranged between two electrodes; b. a particle detector device incorporating means for propelling the suspension liquid through the capillary restricted measurement path; c. pulse generator means for generating for each particle which passes through the measurement path a particle pulse with a peak amplitude proportional to the particle volume; d. a particle pulse counting mechanism for indicating the sum of the particles contained in a predetermined volume of suspension liquid; e. pulse counting and selection means for converting only such particle pulses which, with regard to a preceding particle pulse possesS a minimum spacing in time, into square wave pulses of appropriate peak amplitude and predetermined nonvariable duration; f. a square wave pulse integration mechanism for the integrating charging of a capacitance to a final voltage which is proportional to the peak amplitude summation of all integrated square wave pulses; g. an auxiliary counting mechanism for counting all integrated square wave pulses until reaching a predetermined final numerical value; h. means for the automatic placing into standstill the integration operation of the integration mechanism upon reaching a predetermined final counter state of the auxiliary counter mechanism and for connecting the capacitance to a discharge current circuit upon termination of the counting function of the particle pulse counting mechanism; i. means for the automatic parallel circuit connection of additional conductance values at a basic conductance value of a discharge current circuit in functional dependency of the attained counter state of the particle pulse counter mechanism; and j. means for measuring the discharge time of the capacitance as an actual time value which is proportional to the mean particle volume.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |