At the National Institute of Metrological Research (INRIM), a Hamon guarded 10 $\,\times\,$. By using a guarded scanner and two sources to form a guarded resistance bridge, This circuit is a wheatstone bridge where two legs of the bridge are voltage. Request PDF on ResearchGate | On Jul 1, , Omer Erkan and others published Active Guarded Wheatstone Bridge for High Resistance.
|Published (Last):||5 August 2004|
|PDF File Size:||11.84 Mb|
|ePub File Size:||5.26 Mb|
|Price:||Free* [*Free Regsitration Required]|
A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuitone leg of which includes the unknown component.
The primary benefit of the circuit is its ability guarfed provide extremely accurate measurements in contrast with something like a simple voltage divider. One of the Wheatstone bridge’s initial uses was for the purpose of soils analysis and comparison.
Leeds & Northrup Guarded Wheatstone Bridge | eBay
At this point, the voltage between the two midpoints B and D will be zero. Detecting zero current with a galvanometer can be done to extremely high precision. This wyeatstone is frequently used in strain gauge and resistance thermometer measurements, as it is usually faster to read a voltage level off a meter than to adjust a resistance to zero the voltage. First, Kirchhoff’s first law is used to find the currents in junctions B and D:.
The desired value of R x is now known to be given as:. On the other hand, if the resistance of the galvanometer is high enough that I G is guared, it is possible to compute R x from the three other resistor values and the supply voltage V Sor the supply voltage from all four resistor values.
To do so, one has to work out the voltage from each potential divider and subtract one from the other. The guxrded for this are:. The Wheatstone bridge illustrates the concept of a brivge measurement, which can be extremely accurate. Variations on the Wheatstone bridge can be used to measure capacitanceinductanceimpedance and other quantities, such as the amount of combustible gases in a sample, with an explosimeter.
The Kelvin bridge was specially adapted from the Wheatstone bridge for measuring very low resistances. In many cases, the significance of measuring the unknown resistance is related to measuring the impact of some physical phenomenon such as force, temperature, pressure, etc. The concept was extended to alternating current measurements by James Clerk Maxwell wwheatstone and further improved by Alan Blumlein around The Wheatstone bridge is the fundamental bridge, but there are other modifications that can be made to measure various kinds of resistances when the fundamental Tuarded bridge is not suitable.
Some of the modifications are:. From Wikipedia, the free encyclopedia. Published in “Engineering Science and Education Journal”, volume 10, no 1, Februarypages 37— Kelvin bridge Wheatstone bridge.
Schering Bridge Wien bridge. Diode bridge H bridge. Geophone Hydrophone Microphone Seismometer. Air—fuel ratio meter Blind spot monitor Crankshaft position sensor Curb feeler Defect detector Engine coolant temperature sensor Hall effect sensor MAP sensor Mass flow sensor Omniview technology Oxygen sensor Parking sensors Radar gun Speed sensor Speedometer Throttle position sensor Tire-pressure monitoring system Torque sensor Transmission fluid temperature sensor Turbine speed sensor Variable reluctance sensor Vehicle speed sensor Water sensor Wheel speed sensor.
Breathalyzer Carbon dioxide sensor Carbon monoxide detector Catalytic bead sensor Chemical field-effect transistor Electrochemical gas sensor Electrolyte—insulator—semiconductor sensor Electronic nose Fluorescent chloride sensors Holographic wheatatone Hydrocarbon dew point analyzer Hydrogen sensor Hydrogen sulfide sensor Infrared point sensor Ion selective electrode Microwave chemistry sensor Nitrogen oxide sensor Nondispersive infrared sensor Olfactometer Optode Oxygen sensor Pellistor pH glass electrode Potentiometric sensor Redox electrode Smoke detector Zinc oxide nanorod sensor.
Accelerometer Angular rate sensor Auxanometer Capacitive displacement sensor Capacitive sensing Gravimeter Inclinometer Integrated circuit piezoelectric sensor Laser rangefinder Laser surface velocimeter Lidar Linear encoder Linear variable differential transformer Liquid capacitive inclinometers Odometer Photoelectric sensor Piezoelectric accelerometer Position sensor Rotary encoder Rotary variable differential transformer Selsyn Sudden Motion Sensor Tachometer Tilt sensor Ultrasonic thickness gauge Variable reluctance sensor Velocity receiver.
Active pixel sensor Angle—sensitive pixel Back-illuminated sensor Charge-coupled device Contact image sensor Electro-optical sensor Flame detector Infrared Kinetic inductance detector LED as light sensor Light-addressable potentiometric sensor Nichols radiometer Optical fiber Photodetector Photodiode Photoelectric sensor Photoionization detector Photomultiplier Photoresistor Photoswitch Phototransistor Phototube Position sensitive device Scintillometer Shack—Hartmann wavefront sensor Single-photon avalanche diode Superconducting nanowire single-photon detector Transition edge sensor Tristimulus colorimeter Visible-light photon counter Wavefront sensor.