Boong Y Cho

US Patent:

48151165, Mar 21, 1989

Filed:

Sep 17, 1981

Appl. No.:

6/302959

Inventors:

Boong Y. Cho - Columbus OH

Assignee:

Process Automation Business, Inc. - Columbus OH

International Classification:

G01N 2306
G01N 2316

US Classification:

378 53

Abstract:

A beam of X rays is directed into a traveling product such as paper having a constituent such as ash made up of components such as clay, chalk and titanium dioxide. X rays from the product may produce signal channel responses that are the same to one component but different to another component, and a resultant response indicative of the content of the constituent or component. The X rays from the product may produce a response to a detected spectrum wherein the intensities of the rays are so distributed as a function of energy that the average effective absorption coefficients for the components are substantially equalized, so that the response will be indicative of the constituent and comparatively unaffected by the relative amounts of the components.

US Patent:

45995141, Jul 8, 1986

Filed:

Dec 13, 1982

Appl. No.:

6/449276

Inventors:

Boong Y. Cho - Columbus OH

Assignee:

AccuRay Corporation - Columbus OH

International Classification:

G01F 2300

US Classification:

2503591

Abstract:

A traveling mat (10) of glass fibers that have been coated with a resinous binder is measured so as to determine quantitatively the mass of binder per unit area of the mat, by directing into the traveling mat gamma rays (26) from a first radiation source (28) comprising americium-241 isotope, also directing into the traveling mat isotopic X-rays (30) from a second radiation source (32) comprising curium-244 isotope, detecting (at 22) the gamma rays from the traveling mat to produce a first response (R. sub. A), detecting (at 24) the isotopic X-rays from the traveling mat to produce a second response (R. sub. C) and forming (at 48) a combination of the first and second responses so as to produce a third response (B) that is indicative of the mass of the binder and substantially independent of the mass of the glass fibers.

US Patent:

48037150, Feb 7, 1989

Filed:

Oct 10, 1986

Appl. No.:

6/918162

Inventors:

Boong Y. Cho - Columbus OH

Assignee:

Process Automation Business, Inc. - Columbus OH

International Classification:

G01B 1502

US Classification:

378 90

Abstract:

An apparatus for measuring the thickness of a sheet of metal by irradiating the sheet with x-rays. The intensity of the initial x-rays, the transmitted x-rays, and the backscattered x-rays are detected and the detector signals are processed to produce a signal representing the thickness of the metal sheet.

US Patent:

40526151, Oct 4, 1977

Filed:

Jul 30, 1976

Appl. No.:

5/710026

Inventors:

Boong Youn Cho - Columbus OH

Assignee:

Industrial Nucleonics Corporation - Columbus OH

International Classification:

G01N 2130

US Classification:

250341

Abstract:

A property such as moisture content in a sheet of material such as paper that both absorbs and strongly scatters infrared radiation is measured by passing the sheet through the central region of a substantially spherical cavity formed between a pair of concave mirror-surfaced, specularly reflecting bodies that are spaced apart to form a pass gap of sufficient width to allow substantially free movement of the sheet therethrough while substantially enclosing a first portion of the sheet on both sides. A spot of infrared radiation is projected onto one side of the sheet in the center of the cavity to illuminate a second portion of the sheet included within and substantially smaller than the enclosed first portion. Thus infrared radiation scattered or transmitted by the second portion is reflected from the mirror-surfaced bodies and directed back to the second portion substantially within the area of the sheet defined by the spot. The relative sizes of the first and second portions in relation to the width of the pass gap determine the relative quantities of radiation being retained in the cavity and escaping through the pass gap.