Strain Gauge Wheatstone Bridge Instrumentation Amplifier Explained

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A Strain Gauge Wheatstone Bridge Instrumentation Amplifier is explained in this video to measure and report the value of Tensile or Compressive Strain in a given structure or mechanical component on which Strain Gauge is applied. Strain Gauge is a sensor that converts strain to electrical resistance that is reduced when the gauge is compressed and is increased when the strain gauge is stretched due to the increased length of the metal wires of the strain gauge. The change in resistor value is sensed by a Wheatstone bridge that converts the resistance change to a voltage change that is then applied as the input voltage of a dual op amp differential amplifier. Both operational amplifiers are properly biased with negative feedback resulting in benefiting from virtual short. These two op amps are effectively wired as non-inverting amplifier or inverting amplifier. And it is shown that the output voltage of this Strain Gauge bridge IA circuit is just linearly proportional to the strain coefficient of the strain gauge. For more examples see @STEMprof Analog playlist • Electrical Engineering... . Notice that both a proper reference voltage is required for the Wheatstone bridge. It is also recommended to select low-drift low-noise op amps for this bridge instrumentation amplifier.

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1 окт 2024

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@STEMprof 7 месяцев назад

A Wheatstone Bridge Strain Gauge Instrumentation Amplifier is explained in this video to measure the value of Tensile or Compressive Strain in a given structure on which Strain Gauge is applied. For more examples see: PhotoDiode Amplifier with Data Compression Explained ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-hqrRx2ufAwg.html Amplifier with -25 to 55 dB Attenuation-Gain range ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-oyz6lTGd2Xo.html Electronic Gain Control for Op Amp Amplifier ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-NoNgQpbj77Y.html Thermometer Circuit Design with Op Amp & BJT transistor ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-55YsraFE0rg.html PhotoDiode Amplifier with Op Amp and MOSFET Explained ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-1c3EJ2d4pVI.html Instrumentation Amplifier with Electronic Gain Control ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-C4tghZ-q6Zs.html Power Amplifier Design (Class A) with Transformer ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-gKlJrqGqeCI.html VCA Electronic Gain Control (Part 1): Voltage-Controlled Attenuator Overview ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-cFzYZsPEtP0.html Analog Multiplier Circuit ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-VP53A2zpVMQ.html Push-Pull Power Amplifier Design with Op Amp, Sziklai Darlington Transistors ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-8BFzsi7-Vbs.html Analog Vector Summer Circuit Design with Op Amp and BJT Transistors ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-PIAsa0QNVns.html Op Amp Analog Computer Differential Equation Solver ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ENq39EesfPw.html Push-Pull Power Amplifier with Darlington Transistors ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-866MYibo8yE.html And the Analog Circuits Video playlist: ru-vid.com/group/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt I hope these Circuit design and analysis videos are interesting.

@ivolol Месяц назад

This actually includes just a nice design for a differential amplifier, but the difference is both the inputs are the pure high impedance opamp inputs. Normally you might need 3 opamp blocks to do this in a traditional instrumentation amplifier design. I quite like this circuit for many ideas. Only needing 2 opamps is extremely convenient for using many dual opamp packages. For instance I'm interested in using it for a low-ohm measurement device. It can measure across the resistance source with very high impedance, so not disturb the current flow, and doesn't need one of the measurement points to be at 0V.

@STEMprof Месяц назад

Thanks Matt for your good summary of interesting features of this two-OpAmp Instrumentation Amplifier. Glad that this design is interesting and useful. Here are a few more videos about different features and types of instrumentation amplifiers: 1x, 10x, 100x, 1000x Switched-Gain Instrumentation Amplifier ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9-MLqyewXW8.html Variable Gain Instrumentation Amplifier for designing Thermometer Current Source ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Ggf0yCaTTiY.html Instrumentation Amplifier Explained ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Yq767et8BbY.html Gain & CMRR of Instrumentation Amplifier Explained ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Bw29QjHHzGo.html Instrumentation Amplifier design with Differential Instrumentation Amplifier with BJT transistor ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-2xJpqfexsPg.html I hope these videos are interesting as well. Thank you.

@chaochang1305 4 месяца назад

How about some pt100 sensor circirts?Looking forward to seeing them.

@STEMprof 4 месяца назад

Thanks for your interest and question. Sure, an example video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-kk2c7Gk3nW4.html discusses using Tempco resistor (temperature compensating resistor) with positive temperature coefficient (like a PTC thermistor). Here is also another circuit video example ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Qe3cY9JSzYg.html that explains Analog Computer that Raises signal to Power of signal with Temperature Compensation using PTC thermal sensor.

@dozog 7 месяцев назад

Used many times. Sometimes adding an extra strain gauge in the other leg of the bridge to compensate for temperature drift.

@STEMprof 6 месяцев назад

Thanks for sharing your experience. Glad that this strain gauge instrumentation amplifier circuit video is useful. Also good point regarding using an extra strain gauge for temperature compensation. 👍

@teardowndan5364 6 месяцев назад

There are some strain gauges with the entire bridge built-in using two pairs of otherwise identical perpendicular cells in mirrored inverse arrangement on the same substrate to form the whole bridge. That doubles sensitivity while taking care of temperature compensation and resistance matching. Of course, you can only use those when you know for certain there won't be any strain in the perpendicular direction large enough to meaningfully interfere with the bridge's two reference gauges/resistors.

@STEMprof 6 месяцев назад

@@teardowndan5364 Good points regarding integrated Dual Strain Gauge and Wheatstone Bridge sensors. Thanks for sharing your thoughts and your interest in this video.