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Main Title Turbidity Instrumentation. A Fiber-Optic System for Measuring Sediment Concentration by Optical Fourier Transformation.
Author McSweene, Albert ;
CORP Author Georgia Inst. of Tech., Atlanta. Environmental Resources Center.
Year Published 1971
Report Number ERC-0471; OWRR-A-027-GA; 13167,; A-027-GA(1)
Stock Number PB-202 985
Additional Subjects ( Turbidimeters ; Fourier transformation) ; ( Suspended sediments ; Particle size distribution) ; Fiber optics ; Helium neon lasers ; Particle size ; Water pollution ; Experimental design ; Water pollution detection
Library Call Number Additional Info Location Last
NTIS  PB-202 985 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 29p
Abstract Optical transformation techniques using a laser for illumination were investigated to measure sediment concentration in a water sample. An optical Fourier transformation system was set up with a bundle of fiber-optic light-pipes connected to an array of photo detectors for analyzing the transform of samples of known particle size distribution. Two of seven information channels of the fiber-optic bundle were used as a test. Intensity measurements from the test of two known monodisperse samples were used to generate a matrix of weight functions. The matrix was used to transform the measured intensity from a mixture containing two particle sizes which were different from the sizes used to determine the matrix. Results show that the system could not distinguish between 160 and 187 micrometer diameter particle but discriminated well between 276 and 321 micrometer diameter particles. Both size resolution and accuracy are expected to improve as more fiber-optic channels are used. (Author)
NTIS Title Notes Completion rept..
PUB Date Free Form Jul 71,
Category Codes 14B; 13B; 73D; 68D
NTIS Prices PC A03 MF A01
Document Type NT
Cataloging Source NTIS/MT
Control Number 326521438
Origin NTIS
Type CAT