Strain Gauge Wheatstone Bridge Instrumentation Amplifier Explained

[@STEMprof]

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 kzbin.info/www/bejne/nqLVg6toqst0rck Amplifier with -25 to 55 dB Attenuation-Gain range kzbin.info/www/bejne/pardZ5-KfMlljtE Electronic Gain Control for Op Amp Amplifier kzbin.info/www/bejne/hKCxmISml89qbbs Thermometer Circuit Design with Op Amp & BJT transistor kzbin.info/www/bejne/a2a8pKWXe6pjqMk PhotoDiode Amplifier with Op Amp and MOSFET Explained kzbin.info/www/bejne/Z5SWdn1omZmjjKs Instrumentation Amplifier with Electronic Gain Control kzbin.info/www/bejne/eWXXmJuQYtZpkNU Power Amplifier Design (Class A) with Transformer kzbin.info/www/bejne/nXzPe6WnfNaYeas VCA Electronic Gain Control (Part 1): Voltage-Controlled Attenuator Overview kzbin.info/www/bejne/mXfdio2phaqnhpI Analog Multiplier Circuit kzbin.info/www/bejne/jIGYZHRor9WJg7M Push-Pull Power Amplifier Design with Op Amp, Sziklai Darlington Transistors kzbin.info/www/bejne/bnOpq6afbJKJmNU Analog Vector Summer Circuit Design with Op Amp and BJT Transistors kzbin.info/www/bejne/hnqkpJRmhrOJpNU Op Amp Analog Computer Differential Equation Solver kzbin.info/www/bejne/e3_UZGx7mtiZhtk Push-Pull Power Amplifier with Darlington Transistors kzbin.info/www/bejne/bmeZfoyfl9Rrr6c And the Analog Circuits Video playlist: kzbin.info/aero/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt I hope these Circuit design and analysis videos are interesting.

[@ivolol]

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]

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 kzbin.info/www/bejne/b16wfaSvmtyLjZo Variable Gain Instrumentation Amplifier for designing Thermometer Current Source kzbin.info/www/bejne/fZjJYax5lrmHn7s Instrumentation Amplifier Explained kzbin.info/www/bejne/j6KaZ2qbqZ11mLs Gain & CMRR of Instrumentation Amplifier Explained kzbin.info/www/bejne/eKiVaoSgfa2tfdE Instrumentation Amplifier design with Differential Instrumentation Amplifier with BJT transistor kzbin.info/www/bejne/aKmtoaScmt2mhsk I hope these videos are interesting as well. Thank you.

[@chaochang1305]

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

[@STEMprof]

Thanks for your interest and question. Sure, an example video kzbin.info/www/bejne/oZyVlGp9oJihjZY discusses using Tempco resistor (temperature compensating resistor) with positive temperature coefficient (like a PTC thermistor). Here is also another circuit video example kzbin.info/www/bejne/h5aWlIxvf7itj8k that explains Analog Computer that Raises signal to Power of signal with Temperature Compensation using PTC thermal sensor.

[@dozog]

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

[@STEMprof]

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]

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]

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

[@fouadnano]

thinkyou

[@STEMprof]

You are welcome. Glad that you liked this strain gauge instrumentation amplifier circuit video.