CA2139178A1 - Particle classification method and apparatus - Google Patents

Particle classification method and apparatus

Info

Publication number
CA2139178A1
CA2139178A1 CA002139178A CA2139178A CA2139178A1 CA 2139178 A1 CA2139178 A1 CA 2139178A1 CA 002139178 A CA002139178 A CA 002139178A CA 2139178 A CA2139178 A CA 2139178A CA 2139178 A1 CA2139178 A1 CA 2139178A1
Authority
CA
Canada
Prior art keywords
particle
particles
pulse
light
diamond
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.)
Granted
Application number
CA002139178A
Other languages
French (fr)
Other versions
CA2139178C (en
Inventor
Con-Vivier Venter
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.)
Element Six Pty Ltd
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2139178A1 publication Critical patent/CA2139178A1/en
Application granted granted Critical
Publication of CA2139178C publication Critical patent/CA2139178C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/65—Raman scattering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/87—Investigating jewels

Landscapes

  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Abstract

The invention concerns a method and apparatus for classifying particles, and in particular for classifying particles according to whether they are diamond or non-diamond particles. In the method each particle (24) is irradiated with a pulse of monochromatic light capable of causing Raman spectral activation in certain particles. Light emitted by the particle is filtered to remove components which are outside a band including a characteristic Raman spectrum for the relevant class of particles. The filtered light is direct onto a light sensitive switch (26) which is arranged to close on receipt of filtered light of predetermined intensity. On closure of the light sensitive switch, an electrical pulse is generated and directed towards a pulse detector (32). The particle is classified according to whether or not the pulse detector (32) detects an electrical pulse within a predetermined time window. The original pulse of monochromatic light can be split into a test portion, used to irradiate the particle, and a control portion used to control a time gating apparatus which sets the time window. The method can be used in a particle sorting method in which, typically diamond and non-diamond particles are separated from one another.
CA002139178A 1993-12-30 1994-12-28 Particle classification method and apparatus Expired - Fee Related CA2139178C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA93/9797 1993-12-30
ZA939797 1993-12-30

Publications (2)

Publication Number Publication Date
CA2139178A1 true CA2139178A1 (en) 1995-07-01
CA2139178C CA2139178C (en) 2007-01-30

Family

ID=25583567

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002139178A Expired - Fee Related CA2139178C (en) 1993-12-30 1994-12-28 Particle classification method and apparatus

Country Status (6)

Country Link
AU (1) AU687470B2 (en)
BR (1) BR9405310A (en)
CA (1) CA2139178C (en)
GB (1) GB2285311B (en)
RU (1) RU94045262A (en)
ZA (1) ZA9410191B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA955745B (en) * 1994-08-19 1996-02-20 De Beers Ind Diamond Classification of particles according to their Raman response

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4286170A (en) * 1980-02-11 1981-08-25 Samuel Moti X-Ray face mask and chest shield device
DD254998A1 (en) * 1985-07-26 1988-03-16 Zeiss Jena Veb Carl ARRANGEMENT FOR THE IMAGE AND ANALYSIS OF FLUORESCENCE SIGNALS
GB2219080B (en) * 1988-05-06 1992-11-04 Gersan Ets Identifying gemstones
US5275168A (en) * 1992-03-31 1994-01-04 The United States Of America As Represented By The Secretary Of The Navy Time-gated imaging through dense-scattering materials using stimulated Raman amplification

Also Published As

Publication number Publication date
RU94045262A (en) 1996-10-20
CA2139178C (en) 2007-01-30
ZA9410191B (en) 1995-08-25
GB2285311B (en) 1998-01-14
AU8178294A (en) 1995-07-06
AU687470B2 (en) 1998-02-26
GB9425994D0 (en) 1995-02-22
GB2285311A (en) 1995-07-05
BR9405310A (en) 1995-09-19

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed