GB1371432A - Particle study apparatus having particle resolution means - Google Patents

Particle study apparatus having particle resolution means

Info

Publication number
GB1371432A
GB1371432A GB1928972A GB1928972A GB1371432A GB 1371432 A GB1371432 A GB 1371432A GB 1928972 A GB1928972 A GB 1928972A GB 1928972 A GB1928972 A GB 1928972A GB 1371432 A GB1371432 A GB 1371432A
Authority
GB
United Kingdom
Prior art keywords
pulses
particle
particles
lower threshold
positive slope
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1928972A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Coulter Electronics Ltd
Coulter Electronics Inc
Original Assignee
Coulter Electronics Ltd
Coulter Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Coulter Electronics Ltd, Coulter Electronics Inc filed Critical Coulter Electronics Ltd
Priority to GB1928972A priority Critical patent/GB1371432A/en
Publication of GB1371432A publication Critical patent/GB1371432A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/1031—Investigating individual particles by measuring electrical or magnetic effects
    • G01N15/12—Investigating individual particles by measuring electrical or magnetic effects by observing changes in resistance or impedance across apertures when traversed by individual particles, e.g. by using the Coulter principle
    • G01N15/131—Details
    • G01N15/132—Circuits

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

1371432 Particle analysis COULTER ELECTRONICS Ltd 12 May 1972 19289/72 Heading G1N In Coulter type particle study apparatus, improved resolution for two particles within the scanning ambit of the aperture at the same time, is provided using the POSITIVE SLOPES of scanning pulses within a window defined by adjustable UPPER and LOWER THRESHOLD circuits. Fig.2, shows a line I, five pulses from particles arranged in the aperture as shown at A..E. Pulses from a positive slope detector, (line II) occurring while the amplitude is above a minimum threshold 46 (line III) enable two particles to be resolved in cases B and C. Pulses exceeding the upper threshold limit may be discarded, Fig.4 (not shown). A block diagram, Fig.3 (not shown), illustrates positive slope detectors (78) and upper and lower threshold detectors (80), (82) connected to a VETO/AND circuit (86). The positive slope detector is illustrated as including an R-C differentiating circuit (112), (114); lower threshold is provided by a biased diode shunt (124); the output passes to a pulse shaping circuit (128), Fig.5 (not shown).
GB1928972A 1972-05-12 1972-05-12 Particle study apparatus having particle resolution means Expired GB1371432A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1928972A GB1371432A (en) 1972-05-12 1972-05-12 Particle study apparatus having particle resolution means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1928972A GB1371432A (en) 1972-05-12 1972-05-12 Particle study apparatus having particle resolution means

Publications (1)

Publication Number Publication Date
GB1371432A true GB1371432A (en) 1974-10-23

Family

ID=10126927

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1928972A Expired GB1371432A (en) 1972-05-12 1972-05-12 Particle study apparatus having particle resolution means

Country Status (1)

Country Link
GB (1) GB1371432A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0844475A2 (en) * 1996-11-20 1998-05-27 Microbial Systems Limited Particle sizing apparatus
US6418802B1 (en) 1996-11-21 2002-07-16 Michael Anthony Wood Particle sizing apparatus and method of use thereof
WO2006037325A1 (en) * 2004-10-01 2006-04-13 Chempaq A/S A method for calibrating a particle counting apparatus
WO2009109190A1 (en) * 2008-03-03 2009-09-11 Chempaq A/S High resolution classification

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0844475A2 (en) * 1996-11-20 1998-05-27 Microbial Systems Limited Particle sizing apparatus
EP0844475A3 (en) * 1996-11-20 1999-12-08 Microbial Systems Limited Particle sizing apparatus
US6389912B1 (en) 1996-11-20 2002-05-21 Michael Anthony Wood Particle sizing apparatus and method of use thereof
US6418802B1 (en) 1996-11-21 2002-07-16 Michael Anthony Wood Particle sizing apparatus and method of use thereof
WO2006037325A1 (en) * 2004-10-01 2006-04-13 Chempaq A/S A method for calibrating a particle counting apparatus
US7928718B2 (en) 2004-10-01 2011-04-19 Chempaq A/S Method for calibrating a particle counting apparatus
WO2009109190A1 (en) * 2008-03-03 2009-09-11 Chempaq A/S High resolution classification
AU2009221393B2 (en) * 2008-03-03 2014-01-09 Koninklijke Philips Electronics N.V. High resolution classification

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee