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Browse Prior Art Database

Colorimetry Applied to Quantitative Chemical Analysis in Electron Probe Microanalysis

IP.com Disclosure Number: IPCOM000074229D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

DiGiacomo, G: AUTHOR [+2]

Abstract

A color display of the characteristic X-rays from a sample is made on a cathode-ray tube of a trigun oscilloscope which displays three colors, one for each gun. Using this arrangement, three elements can be displayed simultaneously in different colors on the face of the oscilloscope. The characteristic X-rays are produced by an electron beam impinging on the sample. The beam diameter can be as small as 0.25 microns. The X-rays emitted by the sample modulate the guns of the scope, one element per gun. At the same time the electron beam scans an area in the sample as large as 16 x 10/4/ microns square. Since the electron beam in the microprobe is synchronized with the trigun oscilloscope, a color distribution of three elements, or less, in the sample can be displayed simultaneously.

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Colorimetry Applied to Quantitative Chemical Analysis in Electron Probe Microanalysis

A color display of the characteristic X-rays from a sample is made on a cathode-ray tube of a trigun oscilloscope which displays three colors, one for each gun. Using this arrangement, three elements can be displayed simultaneously in different colors on the face of the oscilloscope. The characteristic X-rays are produced by an electron beam impinging on the sample. The beam diameter can be as small as 0.25 microns. The X-rays emitted by the sample modulate the guns of the scope, one element per gun. At the same time the electron beam scans an area in the sample as large as 16 x 10/4/ microns square. Since the electron beam in the microprobe is synchronized with the trigun oscilloscope, a color distribution of three elements, or less, in the sample can be displayed simultaneously.

The colors assigned to each element in their pure state are blue, green, and red. When the elements are combined, the resultant color is a mixture of these colors in a ratio which corresponds to the element's concentration. The concentrations and the resultant colors are governed by mathematical relationships. Mathematical relationships relating color coordinates: hue, brightness, and strength, to the chemical composition can be determined on the basis of color distributions obtained from known standards.

If the resultant color is analyzed with a colorimeter, commonly known as "color eye", the concentr...