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Related Concept Videos

Wheatstone Bridge01:29

Wheatstone Bridge

An ohmmeter is a resistance-measuring device. It works by applying a voltage to a resistor of unknown resistance and measuring the current across the resistor. The resistance value is deduced using Ohm's law. Usually, the standard configuration of an ohmmeter comprises a voltmeter or an ammeter. However, such configurations are limited in accuracy because the meters alter the voltage applied to the resistor and the current that flows through it.
Thus, for accurate resistance measurements, a...
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
Bridge rectifier01:24

Bridge rectifier

The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
Operationally, the bridge rectifier allows current flow through two of its diodes during each...
Linear Circuits01:17

Linear Circuits

A linear circuit is characterized by its output having a direct proportionality to its input, adhering to the linearity property, which encompasses the principles of homogeneity (scaling) and additivity. Homogeneity dictates that when the input, also referred to as the excitation, is multiplied by a constant factor, the output, known as the response, is correspondingly scaled by the same constant factor. For instance, if the current is multiplied by a constant 'k,' the voltage likewise...
Current Dividers01:10

Current Dividers

In parallel electrical connections, resistors are linked between the same pair of nodes, creating an equal voltage across each resistor. Kirchhoff's current law is applied to these connections, establishing that the sum of currents through these resistors equals the source current. Utilizing Ohm's law, the source current is determined as the product of the source voltage and the sum of the reciprocals of individual resistances. This relationship simplifies the process of finding the current...
Controlled-Current Coulometry: Overview01:27

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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...

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A Strain Gauge Monitor (SGM) for Continuous Valve Gape Measurements in Bivalve Molluscs in Response to Laboratory Induced Diel-cycling Hypoxia and pH
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A Strain Gauge Monitor (SGM) for Continuous Valve Gape Measurements in Bivalve Molluscs in Response to Laboratory Induced Diel-cycling Hypoxia and pH

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Wheatstone bridge fed from a bilateral constant current source.

C Velayudhan1, D Oommen

  • 1Department of Electrical Engineering, Regional Engineering College, Calicut 673601., Kerala, India.

The Review of Scientific Instruments
|March 1, 1980
PubMed
Summary

A cost-effective electronic amplifier for Wheatstone bridge circuits is introduced. This design utilizes a constant current square wave source, offering distinct advantages for sensor measurements.

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A Strain Gauge Monitor (SGM) for Continuous Valve Gape Measurements in Bivalve Molluscs in Response to Laboratory Induced Diel-cycling Hypoxia and pH
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Area of Science:

  • Electronics
  • Instrumentation
  • Sensor Technology

Background:

  • Wheatstone bridges are fundamental in precise measurement applications.
  • Traditional Wheatstone bridge excitation methods can be susceptible to noise and drift.
  • The need for stable and cost-effective amplification remains critical in sensor instrumentation.

Purpose of the Study:

  • To present a simple and inexpensive electronic amplifier scheme for Wheatstone bridge applications.
  • To demonstrate the benefits of using a bilateral constant current square wave source for bridge excitation.
  • To highlight the advantages of constant current drive in improving measurement accuracy and stability.

Main Methods:

  • Development of a novel electronic amplifier circuit.
  • Implementation of a bilateral constant current square wave generator for bridge excitation.
  • Experimental validation of the amplifier's performance with a Wheatstone bridge setup.

Main Results:

  • The proposed amplifier scheme is demonstrated to be simple and inexpensive.
  • Constant current excitation provides a stable driving force for the Wheatstone bridge.
  • The system shows improved performance characteristics compared to conventional methods.

Conclusions:

  • The presented electronic amplifier offers a practical and economical solution for Wheatstone bridge applications.
  • Constant current excitation is advantageous for enhancing the performance of Wheatstone bridge-based sensor systems.
  • This scheme is suitable for various applications requiring precise and stable measurements.