Diamond Measuring Machine Metadata

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Title

  • Main Title Diamond Measuring Machine

Creator

  • Author: Krstulic, J. F.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: US Department of Energy (United States)

Publisher

  • Name: Kansas City Plant (U.S.)
    Place of Publication: Kansas City, Missouri
    Additional Info: Kansas City Plant, Kansas City, MO (United States)

Date

  • Creation: 2000-01-27

Language

  • English

Description

  • Content Description: The fundamental goal of this project was to develop additional capabilities to the diamond measuring prototype, work out technical difficulties associated with the original device, and perform automated measurements which are accurate and repeatable. For this project, FM and T was responsible for the overall system design, edge extraction, and defect extraction and identification. AccuGem provided a lab and computer equipment in Lawrence, 3D modeling, industry expertise, and sets of diamonds for testing. The system executive software which controls stone positioning, lighting, focusing, report generation, and data acquisition was written in Microsoft Visual Basic 6, while data analysis and modeling were compiled in C/C++ DLLs. All scanning parameters and extracted data are stored in a central database and available for automated analysis and reporting. The Phase 1 study showed that data can be extracted and measured from diamond scans, but most of the information had to be manually extracted. In this Phase 2 project, all data required for geometric modeling and defect identification were automatically extracted and passed to a 3D modeling module for analysis. Algorithms were developed which automatically adjusted both light levels and stone focus positioning for each diamond-under-test. After a diamond is analyzed and measurements are completed, a report is printed for the customer which shows carat weight, summarizes stone geometry information, lists defects and their size, displays a picture of the diamond, and shows a plot of defects on a top view drawing of the stone. Initial emphasis of defect extraction was on identification of feathers, pinpoints, and crystals. Defects were plotted color-coded by industry standards for inclusions (red), blemishes (green), and unknown defects (blue). Diamonds with a wide variety of cut quality, size, and number of defects were tested in the machine. Edge extraction, defect extraction, and modeling code were tested for multiple runs of each stone. Although there were problems with a few stones, the machine automatically completed measurements on a majority of the stones tested. A demo was performed in Lawrence for AccuGem stockholders and potential investors. The demo successfully demonstrated our technology on a random stone brought by an attendee. In conclusion, the project was successful in development of the basic technology required for a diamond measuring machine. Continued improvements in lighting control, edge and defect extraction, and an increased image depth-of-field will increase the reliability and consistency of measurements. Although additional work is needed to make the machine a commercial product, there are no foreseeable technical roadblocks in that process.
  • Physical Description: 8 pages

Subject

  • Keyword: Data Analysis
  • Keyword: Data Acquisition Systems
  • STI Subject Categories: 36 Materials Science
  • Keyword: Crystal Defects
  • Keyword: Computerized Control Systems
  • Keyword: Design
  • Keyword: Diamonds
  • Keyword: Size

Source

  • Other Information: PBD: 27 Jan 2000

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Report No.: KCP-613-6280
  • Report No.: CRADA 98KCP1072
  • Grant Number: AC04-76DP00613
  • DOI: 10.2172/750426
  • Office of Scientific & Technical Information Report Number: 750426
  • Archival Resource Key: ark:/67531/metadc710461

Note

  • Display Note: OSTI as DE00750426
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