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Title: Three axis velocity probe system

Abstract

A three-axis velocity probe system for determining three-axis positional velocities of small particles in fluidized bed systems and similar applications. This system has a sensor head containing four closely-spaced sensing electrodes of small wires that have flat ends to establish a two axis plane, e.g. a X-Y plane. Two of the sensing electrodes are positioned along one of the axes and the other two are along the second axis. These four sensing electrodes are surrounded by a guard electrode, and the outer surface is a ground electrode and support member for the sensing head. The electrodes are excited by, for example, sinusoidal voltage having a peak-to-peak voltage of up to 500 volts at a frequency of 2 MHz. Capacitive currents flowing between the four sensing electrodes and the ground electrode are influenced by the presence and position of a particle passing the sensing head. Any changes in these currents due to the particle are amplified and synchronously detected to produce positional signal values that are converted to digital form. Using these digital forms and two values of time permit generation of values of the three components of the particle vector and thus the total velocity vector.

Inventors:
 [1];  [2];  [1]
  1. Morgantown, WV
  2. (Morgantown, WV)
Issue Date:
Research Org.:
National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
OSTI Identifier:
868586
Patent Number(s):
5170670
Assignee:
United States of America as represented by United States (Washington, DC)
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
axis; velocity; probe; three-axis; determining; positional; velocities; particles; fluidized; bed; systems; similar; applications; sensor; head; containing; closely-spaced; sensing; electrodes; wires; flat; establish; plane; x-y; positioned; axes; surrounded; guard; electrode; outer; surface; ground; support; excited; example; sinusoidal; voltage; peak-to-peak; 500; volts; frequency; mhz; capacitive; currents; flowing; influenced; presence; position; particle; passing; changes; due; amplified; synchronously; detected; produce; signal; values; converted; digital; form; forms; time; permit; generation; components; vector; total; guard electrode; fluidized bed; outer surface; ground electrode; sensing electrodes; sensing electrode; sensor head; similar applications; digital form; signal value; currents flowing; velocity probe; peak voltage; time permit; bed systems; /73/324/361/

Citation Formats

Fasching, George E, Smith, Jr., Nelson S., and Utt, Carroll E. Three axis velocity probe system. United States: N. p., 1992. Web.
Fasching, George E, Smith, Jr., Nelson S., & Utt, Carroll E. Three axis velocity probe system. United States.
Fasching, George E, Smith, Jr., Nelson S., and Utt, Carroll E. Wed . "Three axis velocity probe system". United States. https://www.osti.gov/servlets/purl/868586.
@article{osti_868586,
title = {Three axis velocity probe system},
author = {Fasching, George E and Smith, Jr., Nelson S. and Utt, Carroll E},
abstractNote = {A three-axis velocity probe system for determining three-axis positional velocities of small particles in fluidized bed systems and similar applications. This system has a sensor head containing four closely-spaced sensing electrodes of small wires that have flat ends to establish a two axis plane, e.g. a X-Y plane. Two of the sensing electrodes are positioned along one of the axes and the other two are along the second axis. These four sensing electrodes are surrounded by a guard electrode, and the outer surface is a ground electrode and support member for the sensing head. The electrodes are excited by, for example, sinusoidal voltage having a peak-to-peak voltage of up to 500 volts at a frequency of 2 MHz. Capacitive currents flowing between the four sensing electrodes and the ground electrode are influenced by the presence and position of a particle passing the sensing head. Any changes in these currents due to the particle are amplified and synchronously detected to produce positional signal values that are converted to digital form. Using these digital forms and two values of time permit generation of values of the three components of the particle vector and thus the total velocity vector.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

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