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Related Concept Videos

Characteristics of MOSFET01:17

Characteristics of MOSFET

334
Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable...
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MOSFET Amplifiers01:17

MOSFET Amplifiers

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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
146
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

342
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...
342
MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

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Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
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Measurements of Strain01:27

Measurements of Strain

366
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Range Extension of Borehole Strainmeters Using MOSFET-Based Multi-Switch Automatic Zero Setting.

Chen Yang1,2, Zheng Chen1, Hong Li1

  • 1National Institute of Natural Hazards, Beijing 100085, China.

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|January 25, 2025
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Summary

This study introduces a novel full-range measurement system for borehole strainmeters, enhancing crustal deformation monitoring. The system uses automatic zero-setting to expand measurement range while maintaining high precision.

Keywords:
automatic controlborehole strainmeterfield-effect transistorrange extension

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Area of Science:

  • Geophysics
  • Earth Science
  • Instrumentation

Background:

  • Borehole strainmeters are crucial for observing crustal deformation.
  • Long-term monitoring faces challenges due to measurement range limitations of conventional strainmeters.
  • Expanding measurement range without sacrificing precision is a key technical hurdle.

Purpose of the Study:

  • To develop a full-range measurement system for borehole strainmeters.
  • To overcome the limited measurement range of existing borehole strainmeters.
  • To maintain high precision during extended crustal deformation observations.

Main Methods:

  • Developed a full-range measurement system utilizing a bidirectional analog multi-switch (MOS transistors) and automatic feedback control.
  • Implemented automatic zero-point adjustment to maintain the measurement bridge in a near-balanced state.
  • Quantified zero-setting actions as equivalent voltage for automatic full-range measurements.

Main Results:

  • The system effectively utilizes the linear range of differential capacitive sensors.
  • Laboratory tests confirmed the system's capability to cover the sensor's effective linear range of approximately 100 μm.
  • An RZB borehole strainmeter equipped with the system demonstrated successful full-range measurement.

Conclusions:

  • The developed automatic zero-setting range extension system significantly enhances borehole strainmeter capabilities.
  • This innovation enables high-precision, multi-year monitoring of dynamic crustal deformation.
  • The system addresses a critical challenge in geophysical observation instrumentation.