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Related Concept Videos

Ammeter01:11

Ammeter

2.3K
An ammeter is a current measuring instrument. In the circuit, it is represented by the symbol A. The ammeter is placed in series with the device or component to measure the current. A series connection is used because objects in series have the same current passing through them. If a circuit has multiple resistors and the current needs to be measured in each resistor, the number of ammeters required depends on whether the circuit is in series or parallel.
When an ammeter is used to measure the...
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Voltmeter01:18

Voltmeter

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A voltmeter is an electrical device that measures the potential difference or voltage between two points. It is connected in parallel with the circuit element it is measuring. A parallel connection is used because elements in parallel experience the same potential difference. The voltmeter is represented by the symbol "V ".
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Pipe Flowrate Measurement01:28

Pipe Flowrate Measurement

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In pipe flow measurement, orifice, nozzle, and Venturi meters are commonly used to determine fluid flowrates by constricting the flow area, which increases fluid velocity and reduces pressure. This pressure difference, governed by Bernoulli's principle and adjusted for real-world conditions, is essential for calculating flowrate. Each meter type is suited to specific applications based on accuracy, efficiency, and compatibility with various flow conditions.
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Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
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Wheatstone Bridge01:29

Wheatstone Bridge

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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...
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Amperometry: Overview01:10

Amperometry: Overview

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Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...
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Updated: Jul 31, 2025

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
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Hybrid framework for single-pointer meter identification.

Zhenyuan Xiao, Weixiang Chen, Guili Xu

    Applied Optics
    |May 3, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a hybrid framework for automated single-pointer meter identification in digital substations. The method accurately identifies various meter types, improving substation operations.

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    Area of Science:

    • Electrical Engineering
    • Computer Vision
    • Automation

    Background:

    • Automated identification of single-pointer meters is crucial for digital substations.
    • Existing methods lack universal applicability and are limited to single meter types.
    • Accurate meter value identification is essential for operational efficiency.

    Purpose of the Study:

    • To develop a universally applicable hybrid framework for single-pointer meter identification.
    • To enhance the accuracy and reliability of meter value identification in substations.
    • To address the limitations of current single-type meter identification methods.

    Main Methods:

    • A hybrid framework combining convolutional neural networks and template matching.
    • Image modeling to extract a priori knowledge (template, dial, pointer, scale positions).
    • Feature point matching for image alignment and pixel loss-free rotation correction for template matching.

    Main Results:

    • Successfully identified nine different types of single-pointer meters.
    • Demonstrated effectiveness across various ambient illumination conditions.
    • Achieved accurate meter value calculation through optimal rotation angle determination.

    Conclusions:

    • The proposed hybrid framework offers a feasible solution for identifying diverse single-pointer meters in substations.
    • The method enhances the automation capabilities of digital substations.
    • Provides a reliable reference for substations requiring accurate meter value identification.