Name: wheatstone bridge output for strain gauge design
Uploaded: 2024-04-11T12:48:31.000Z
Duration: 1 min 15 s
Channel: JoVE

K12 Standards

Texas Essential Knowledge and Skills

High School

Biology

BIO.2

BIO.2.D

design-example-strain-gauge-bridge-or-wheatstone-bridge

Design Example: Strain Gauge Bridge or Wheatstone Bridge

기계적 변형을 전기 신호로 변환하는 변환기인 스트레인 게이지는 종종 힘을 측정하는 데 사용됩니다.
엔지니어의 역할은 휘트스톤 브리지 회로를 설계하고, 각 암에 스트레인 게이지를 배치하고, 출력 전압에 필요한 증폭을 식별하는 것입니다. 여기서, 가해진 힘은 두 스트레인 게이지의 저항을 증가시키고 다른 두 스트레인 게이지의 저항은 감소한다고 가정합니다. 또한 브리지 출력 전압과 저항 변화 사이의 관계가 알려져 있습니다.
이것은 Thevenin의 정리를 사용하여 달성 할 수 있습니다.
입력 전압을 알면 상단 및 하단 분기의 전류가 먼저 결정됩니다. 그런 다음 이 값을 옴의 법칙으로 대체하여 Thevenin 전압을 계산합니다.
테베닌 저항을 계산하기 위해 소스를 제거하고 등가 저항을 단순화된 형태로 결정합니다.
Thevenin 등가 회로에서 브리지 출력 전압은 전압 분배 규칙을 사용하여 계산됩니다.
얻어진 관계를 알려진 관계와 비교하면 원하는 범위 내에서 작동하도록 회로를 설계하는 데 필요한 증폭기 이득을 결정할 수 있습니다.

설계 예: 스트레인 게이지 브리지

기계적 변형을 전기 신호로 변환하기 위한 변환기로 스트레인 게이지를 활용하는 것은 다양한 엔지니어링 응용 분야에서 일반적인 관행입니다. 이러한 스트레인 게이지는 힘이나 압력과 같은 매개변수를 정확하게 측정하기 위해 위트스톤 브리지 회로에 자주 통합됩니다. 이러한 맥락에서 회로 내의 각 요소는 기계적 변형을 받을 때 미묘한 변화를 겪는 저항을 나타냅니다. 주요 목적은 작은 전압 출력의 미세한 변화를 전압계를 사용하여 편리하게 읽을 수 있는 보다 식별 가능한 전압 출력으로 변환하는 것입니다.

엔지니어의 책임에는 스트레인 게이지 설계를 작성하고 저항 변화를 정확하게 반영하기 위해 필요한 증폭을 결정하는 일이 포함됩니다. 이는 브리지 회로의 출력 전압과 저항 변화 사이의 연결을 설정하는 테브낭의 정리를 적용한 것입니다.

절차는 테브낭 전압을 계산하는 것으로 시작됩니다. 이를 위해서는 회로의 상부 및 하부 분기 내 전류의 초기 결정이 필요합니다. 결과적으로 이러한 계산된 전류 값은 옴의 법칙으로 대체되어 테브낭 전압을 도출합니다. 동시에 단순화된 구성에서 전압 소스를 제거하여 테브냉 저항이 결정됩니다.

테브낭 등가 회로는 전압 분할 규칙을 통해 브리지의 출력 전압을 찾습니다. 이 분석의 중요한 결과를 통해 지정된 작동 범위 내에서 효과적으로 작동하도록 회로를 설계하는 데 필요한 증폭기 이득을 정확하게 결정할 수 있습니다.

기계적 변형을 전기 신호로 변환하는 변환기인 스트레인 게이지는 종종 힘을 측정하는 데 사용됩니다.
엔지니어의 역할은 다음과 같습니다.

Education

교육

JoVE Core

Electrical Engineering

전기공학

Unit 1

제1단원

DC Circuit Analysis

DC 회로 분석

KEY TERMS AND CONCEPTS

주요 용어 및 개념

wheatstone bridge output for strain gauge design

A strain gauge and Wheatstone bridge work together to turn mechanical strain into an electrical signal. In engineering, this setup is often used to measure force or pressure. Each part of the bridge has a resistance that changes slightly when strain is applied.

The main goal is to turn a very small voltage output into a larger, easier-to-read signal. A voltmeter can then measure that output more clearly. To do this, an engineer designs the strain gauge circuit and figures out how much amplification is needed so the resistance change is shown accurately.

The analysis uses Thevenin's theorem, which links the bridge output voltage to changes in resistance. First, the Thevenin voltage is found by calculating the currents in the upper and lower branches of the circuit. Those currents are then used with Ohm's law to determine the voltage.

Next, the Thevenin resistance is found by removing the voltage source and simplifying the circuit. The Thevenin equivalent circuit is then used with the voltage division rule to find the bridge output voltage. This result helps determine the amplifier gain needed for the circuit to work in the correct operating range.

Wheatstone Bridge Output for Strain Gauge Design

wheatstone-bridge-output-for-strain-gauge-design

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design example: strain gauge bridge or wheatstone bridge

A strain gauge and Wheatstone bridge work together to turn mechanical strain into an electrical signal. In engineering, this setup is often used to measure force or pressure. Each part of the bridge has a resistance that changes slightly when strain is applied. The main goal is to turn a very small voltage output into a larger, easier-to-read signal. A voltmeter can then measure that output more clearly. To do this, an engineer designs the strain gauge circuit and figures out how much...

key terms and concepts

Learn how a strain gauge and Wheatstone bridge convert strain into voltage, and how Thevenin's theorem helps find the amplifier gain needed.

Wheatstone Bridge Output for Strain Gauge Design | JoVE K12

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Wheatstone Bridge Output for Strain Gauge Design

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