Strain Gauge Wheatstone Bridge Instrumentation Amplifier Explained
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- Опубликовано: 4 мар 2024
- 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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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:
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And the Analog Circuits Video playlist: ruclips.net/p/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt I hope these Circuit design and analysis videos are interesting.
How about some pt100 sensor circirts?Looking forward to seeing them.
Thanks for your interest and question. Sure, an example video ruclips.net/video/kk2c7Gk3nW4/видео.html discusses using Tempco resistor (temperature compensating resistor) with positive temperature coefficient (like a PTC thermistor). Here is also another circuit video example ruclips.net/video/Qe3cY9JSzYg/видео.html that explains Analog Computer that Raises signal to Power of signal with Temperature Compensation using PTC thermal sensor.
Used many times. Sometimes adding an extra strain gauge in the other leg of the bridge to compensate for temperature drift.
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. 👍
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.
@@teardowndan5364 Good points regarding integrated Dual Strain Gauge and Wheatstone Bridge sensors. Thanks for sharing your thoughts and your interest in this video.
thinkyou
You are welcome. Glad that you liked this strain gauge instrumentation amplifier circuit video.