WO2002014837A3 - Diamond detection using coherent anti-stokes raman spectroscopy - Google Patents

Diamond detection using coherent anti-stokes raman spectroscopy Download PDF

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Publication number
WO2002014837A3
WO2002014837A3 PCT/IB2001/001415 IB0101415W WO0214837A3 WO 2002014837 A3 WO2002014837 A3 WO 2002014837A3 IB 0101415 W IB0101415 W IB 0101415W WO 0214837 A3 WO0214837 A3 WO 0214837A3
Authority
WO
WIPO (PCT)
Prior art keywords
cars
diamond
particle
laser beams
raman spectroscopy
Prior art date
Application number
PCT/IB2001/001415
Other languages
French (fr)
Other versions
WO2002014837A2 (en
Inventor
George William Over
Hendrik Gerhard Coenraad Human
Narendra Balagury Viranna
Nicholaas Johannes Adolf Lubbe
Original Assignee
De Beers Cons Mines Ltd
George William Over
Hendrik Gerhard Coenraad Human
Narendra Balagury Viranna
Nicholaas Johannes Adolf Lubbe
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 De Beers Cons Mines Ltd, George William Over, Hendrik Gerhard Coenraad Human, Narendra Balagury Viranna, Nicholaas Johannes Adolf Lubbe filed Critical De Beers Cons Mines Ltd
Priority to CA002418858A priority Critical patent/CA2418858A1/en
Priority to AU2001276600A priority patent/AU2001276600B2/en
Priority to AU7660001A priority patent/AU7660001A/en
Publication of WO2002014837A2 publication Critical patent/WO2002014837A2/en
Publication of WO2002014837A3 publication Critical patent/WO2002014837A3/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
    • B07C5/3425—Sorting according to other particular properties according to optical properties, e.g. colour of granular material, e.g. ore particles, grain
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/44—Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
    • 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
    • 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
    • G01N2021/653—Coherent methods [CARS]

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

Abstract

The invention concerns a method and apparatus for detecting diamonds using the phenomenon of coherent anti-Stokes Raman spectroscopy (CARS). Each particle (46) which is to be analysed is irradiated by a focused particle irradiating beam (44) of laser light formed by combining initial laser beams (35, 36) having frequencies differing from one another by a value characteristic for diamond. Components of the initial laser beams are coherently phase-matched to produce, in diamond particles, a CARS signal characteristic of diamond. The scattered signal from the particle is then collected and analysed for the presence of the characteristic CARS signal. The irradiating beam and/or at least one of the initial laser beams is focused by a lens system including a cylindrical lens. This feature has been found to give an enhanced result compared to conventional CARS analysis.
PCT/IB2001/001415 2000-08-11 2001-08-08 Diamond detection using coherent anti-stokes raman spectroscopy WO2002014837A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002418858A CA2418858A1 (en) 2000-08-11 2001-08-08 Diamond detection using coherent anti-stokes raman spectroscopy
AU2001276600A AU2001276600B2 (en) 2000-08-11 2001-08-08 Diamond detection using coherent anti-stokes raman spectroscopy
AU7660001A AU7660001A (en) 2000-08-11 2001-08-08 Diamond detection using coherent anti-stokes raman spectroscopy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200004111 2000-08-11
ZA2000/4111 2000-08-11

Publications (2)

Publication Number Publication Date
WO2002014837A2 WO2002014837A2 (en) 2002-02-21
WO2002014837A3 true WO2002014837A3 (en) 2002-05-02

Family

ID=25588860

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2001/001415 WO2002014837A2 (en) 2000-08-11 2001-08-08 Diamond detection using coherent anti-stokes raman spectroscopy

Country Status (3)

Country Link
AU (2) AU7660001A (en)
CA (1) CA2418858A1 (en)
WO (1) WO2002014837A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120259229A1 (en) * 2009-12-17 2012-10-11 British Columbia Cancer Agency Branch Apparatus and methods for in vivo tissue characterization by raman spectroscopy
CN105642566B (en) * 2016-03-03 2018-04-06 布勒索特克斯光电设备（合肥）有限公司 A kind of color selector filter apparatus for automatic change
CN106053425A (en) * 2016-05-10 2016-10-26 南京理工大学 Raman spectrum gem and jade appraising device and method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4784275A (en) * 1986-09-15 1988-11-15 Vanzetti Systems Inc. Verification systems for small objects
GB2280956A (en) * 1991-02-20 1995-02-15 Gersan Ets Detecting diamonds in a plurality of objects
CA2241470A1 (en) * 1997-06-26 1998-12-26 De Beers Consolidated Mines Limited Diamond detection using coherent anti-stokes raman spectroscopy
ZA985496B (en) * 1997-06-26 1999-01-20 De Beers Cons Mines Ltd Diamond detection using coherent anti-stokes raman spectroscopy

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4784275A (en) * 1986-09-15 1988-11-15 Vanzetti Systems Inc. Verification systems for small objects
GB2280956A (en) * 1991-02-20 1995-02-15 Gersan Ets Detecting diamonds in a plurality of objects
CA2241470A1 (en) * 1997-06-26 1998-12-26 De Beers Consolidated Mines Limited Diamond detection using coherent anti-stokes raman spectroscopy
ZA985496B (en) * 1997-06-26 1999-01-20 De Beers Cons Mines Ltd Diamond detection using coherent anti-stokes raman spectroscopy

Also Published As

Publication number Publication date
AU2001276600B2 (en) 2005-05-19
AU7660001A (en) 2002-02-25
CA2418858A1 (en) 2002-02-21
WO2002014837A2 (en) 2002-02-21

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