Automatic control and detector for three-terminal resistance measurement
Patent
·
OSTI ID:862685
- Morgantown, WV
A device is provided for automatic control and detection in a three-terminal resistance measuring instrument. The invention is useful for the rapid measurement of the resistivity of various bulk material with a three-terminal electrode system. The device maintains the current through the sample at a fixed level while measuring the voltage across the sample to detect the sample resistance. The three-electrode system contacts the bulk material and the current through the sample is held constant by means of a control circuit connected to a first of the three electrodes and works in conjunction with a feedback controlled amplifier to null the voltage between the first electrode and a second electrode connected to the controlled amplifier output. An A.C. oscillator provides a source of sinusoidal reference voltage of the frequency at which the measurement is to be executed. Synchronous reference pulses for synchronous detectors in the control circuit and an output detector circuit are provided by a synchronous pulse generator. The output of the controlled amplifier circuit is sampled by an output detector circuit to develop at an output terminal thereof a D.C. voltage which is proportional to the sample resistance R. The sample resistance is that segment of the sample between the area of the first electrode and the third electrode, which is connected to ground potential.
- Research Organization:
- MERC
- Assignee:
- United States of America as represented by United States Energy (Washington, DC)
- Patent Number(s):
- US 3988669
- Application Number:
- 05/605,370
- OSTI ID:
- 862685
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
/324/
amplifier
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automatic
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bulk
bulk material
circuit
circuit connected
conjunction
connected
constant
contacts
control
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controlled
current
detect
detection
detector
detector circuit
detectors
device
device maintains
electrode
electrodes
executed
feedback
feedback control
fixed
fixed level
frequency
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ground
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maintains
material
means
measurement
measuring
measuring instrument
oscillator
oscillator provides
output
output terminal
potential
proportional
provided
provides
pulse
pulse generator
pulses
rapid
rapid measurement
reference
reference pulse
reference voltage
resistance
resistance measurement
resistance measuring
resistivity
sample
sampled
segment
sinusoidal
source
synchronous
terminal
third
three-electrode
three-terminal
three-terminal resistance
useful
various
voltage
amplifier
amplifier circuit
amplifier output
automatic
automatic control
bulk
bulk material
circuit
circuit connected
conjunction
connected
constant
contacts
control
control circuit
controlled
current
detect
detection
detector
detector circuit
detectors
device
device maintains
electrode
electrodes
executed
feedback
feedback control
fixed
fixed level
frequency
generator
ground
ground potential
held
held constant
instrument
level
maintains
material
means
measurement
measuring
measuring instrument
oscillator
oscillator provides
output
output terminal
potential
proportional
provided
provides
pulse
pulse generator
pulses
rapid
rapid measurement
reference
reference pulse
reference voltage
resistance
resistance measurement
resistance measuring
resistivity
sample
sampled
segment
sinusoidal
source
synchronous
terminal
third
three-electrode
three-terminal
three-terminal resistance
useful
various
voltage