ZA838869B - Process and apparatus for testing the authenticity of noble metal articles - Google Patents

Process and apparatus for testing the authenticity of noble metal articles

Info

Publication number
ZA838869B
ZA838869B ZA838869A ZA838869A ZA838869B ZA 838869 B ZA838869 B ZA 838869B ZA 838869 A ZA838869 A ZA 838869A ZA 838869 A ZA838869 A ZA 838869A ZA 838869 B ZA838869 B ZA 838869B
Authority
ZA
South Africa
Prior art keywords
noble metal
testing
moulding
authenticity
metal articles
Prior art date
Application number
ZA838869A
Inventor
Geoffrey Gafner
Friedrich Preisser
Original Assignee
Degussa
Int Gold Corp Ltd
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 Degussa, Int Gold Corp Ltd filed Critical Degussa
Publication of ZA838869B publication Critical patent/ZA838869B/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H13/00—Measuring resonant frequency
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02854—Length, thickness

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Immunology (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Acoustics & Sound (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pathology (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

1. An apparatus for testing the purity of noble metal mouldings, more especially noble metal bars and noble metal discs, by imparting transverse vibrations to the noble metal moulding using a vibration generator and measuring the resonance frequency by means of a vibration pickup, characterized in that the vibration generator (10) and the vibration pickup (11) are formed by piezo-electric transducers and are directly coupled to the moulding (1) to be tested and in that one or more supports (2) are present for the moulding (1) to be tested.
ZA838869A 1982-12-03 1983-11-28 Process and apparatus for testing the authenticity of noble metal articles ZA838869B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3244717 1982-12-03

Publications (1)

Publication Number Publication Date
ZA838869B true ZA838869B (en) 1984-12-24

Family

ID=6179689

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA838869A ZA838869B (en) 1982-12-03 1983-11-28 Process and apparatus for testing the authenticity of noble metal articles

Country Status (7)

Country Link
EP (1) EP0113031B1 (en)
JP (1) JPS59150338A (en)
AT (1) ATE34232T1 (en)
DE (1) DE3376586D1 (en)
HK (1) HK62590A (en)
IL (1) IL70357A0 (en)
ZA (1) ZA838869B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4304170C2 (en) * 1993-02-12 1995-10-19 Isad Ingenieurbuero Gmbh Fuer Method and device for recognizing surface structures
DE19908620C1 (en) * 1999-02-27 2000-11-30 Degussa Device and method for checking the authenticity of shaped metal articles
GB2512289B (en) * 2013-03-22 2018-12-26 Ross Nedwell Jeremy A device for determining the characteristic impedance spectrum of a token
FR3007141A1 (en) * 2013-06-18 2014-12-19 Jacques Clausin DEVICE FOR CONTROLLING THE METALLURGICAL PURITY OF GOLD OBJECTS, ESPECIALLY INGOTS AND BARS

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT200364B (en) * 1957-03-06 1958-10-25 Horst Dipl Ing Kottas Device for measuring the resonance frequencies of test specimens
GB1011472A (en) * 1962-10-17 1965-12-01 British Cast Iron Res Ass Improvements in the non-destructive testing of materials
CH553456A (en) * 1973-04-19 1974-08-30 Kuniaki Miyazawa COIN VALIDATOR.
DE2628178A1 (en) * 1976-06-23 1977-12-29 Cremer & Breuer Keramische METHOD AND DEVICE FOR AUTOMATIC, CONTINUOUS, NON-DESTRUCTION-FREE QUALITY CONTROL, IN PARTICULAR OF STONE PIPES
DK139597B (en) * 1977-07-01 1979-03-12 Akad Tekn Videnskaber Apparatus for recording echo impulses during ultrasound examinations.
JPS5734545A (en) * 1980-08-08 1982-02-24 Canon Inc Camera

Also Published As

Publication number Publication date
DE3376586D1 (en) 1988-06-16
EP0113031A3 (en) 1985-04-10
EP0113031B1 (en) 1988-05-11
IL70357A0 (en) 1984-03-30
HK62590A (en) 1990-08-17
JPS59150338A (en) 1984-08-28
EP0113031A2 (en) 1984-07-11
ATE34232T1 (en) 1988-05-15

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