Measurement of particle speed through optical reflective sensing

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Two methods determine the speed of 3 m glass spheres using optical reflective sensors embedded in a micro-processor system. The first method, which will be referred to as the one pulse method, is sensitive to particle size and shape. The pulse width of a detected particle is measured and normalized by a shape correction factor resulting in a speed estimate. Three models are developed to correct for effects due to particle shape and light scattering inhomogeneities. The second method, which will be referred to as the two pulse method, measures individual particle velocity components independent of size and shape with ... continued below

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70 p.

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McCardle, J. December 31, 1993.

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Description

Two methods determine the speed of 3 m glass spheres using optical reflective sensors embedded in a micro-processor system. The first method, which will be referred to as the one pulse method, is sensitive to particle size and shape. The pulse width of a detected particle is measured and normalized by a shape correction factor resulting in a speed estimate. Three models are developed to correct for effects due to particle shape and light scattering inhomogeneities. The second method, which will be referred to as the two pulse method, measures individual particle velocity components independent of size and shape with two detectors spaced a known distance apart. This distance is divided by the delay between the two detector output pulses to determine speed. A by-product of both methods is a localized particle flux. The microprocessor subsystem automates the pulse detection, timing, velocity calculation and display which are accomplished by the micro-processor subsystem. In the laboratory, a chute is used to generate particle flows with different characteristics. The detection system is tested in the chute for two different flows. A mechanical speed measurement is used for comparison to the one pulse method. The one pulse method is used for comparison to the two pulse method. A mechanical average mass flow rate is used for comparison to the flow rate measurements. Results obtained indicate that the one pulse method estimate is within 4% of the mechanically measured speed. The two pulse method gives erroneous results, in this application, due to detector separation distance greater than 3 particle diameters. The mass flow rate measurement gives erroneous results due to detector head placement. Solutions are proposed to correct discrepancies.

Physical Description

70 p.

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OSTI as DE97002322

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  • Other Information: TH: Thesis (M.S.)

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  • Other: DE97002322
  • Report No.: DOE/PC/90182--T21
  • Grant Number: AC22-91PC90182
  • Office of Scientific & Technical Information Report Number: 425292
  • Archival Resource Key: ark:/67531/metadc689059

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 31, 1993

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Nov. 11, 2015, 12:30 p.m.

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McCardle, J. Measurement of particle speed through optical reflective sensing, thesis or dissertation, December 31, 1993; United States. (digital.library.unt.edu/ark:/67531/metadc689059/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.