Three axis velocity probe system
- Morgantown, WV
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.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 5170670
- OSTI ID:
- 868586
- Country of Publication:
- United States
- Language:
- English
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Three axis velocity probe system
Three axis velocity probe system
Related Subjects
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/