Strain Gauge 4 - Temperature Correction.MP4

This clip shows how to correctly measure bending strain in a beam even if there is a temperature change. I show how to use two gauges in a half bridge configuration and give some sample calculations.

[icemanfiveoh]

I wish all my teachers were like you. I would like to start up school again, and i can only hope that there are teachers that can convey the information like you. I like the integration between mechanical eng. and electrical eng. I already have a electronics degree, so most of this is basic but the specific information and the derived math is easy to follow and is not super complicated. Thanks for puting this out there.

[playvectrex]

Just wanted to say thanks for putting these tutorials on Strain Gauges together. Your teaching style is very easy to follow and I appreciate the knowledge. I'm looking to build a load cell with a range of 0-200lbs. and I have a bunch of gauges already. Just trying to piece all of the knowledge together to build my first circuit and calibrate everything. I like the cantilever design method, but I would like to keep the sensor and mechanics slim so it might not work out.

[varuninnz]

Thank you soo much for that. I've watched all your videos on strain gauges and they are great. your tone is very friendly and style of teaching is amazing. Yes I'd like to see other ways of wiring the Wheatstone bridges. Can u please make more videos. thanks

[omash]

I was not understanding strain gouges but after watching your video I completely understood thanks a lot sir
Keep teaching us

[Barry.ONeill]

I would like to see you cover more topics in Mechanics of materials this was very helpful for my reports and understanding in my mechanical engineering couse. Thanks

[HITMAN]

I think your strain at the end due to bending is twice as much as it needs to be, you must of used y=50mm, but shouldn't it be 25mm, hence - strain = My/EI = = 3.43x10^-4. Love your explanation, so kind of you posting beneficial videos. Thanks.

[harrywhite]

Very well done even with the errors. Thanks.

[vonJeste]

@purdueMET - Hello professor, this might be a little too late after you were doing this, but I would like to ask you if there is any way you could explain FBG sensors for strain gauges. Thank you for your time spent explaining the strain gauge basics in such detailed manner.

[daniellebovsky]

Thank you for the video. I have a problem with my strain gauges and I would be grateful if you help me with it. I used two aluminum type strain gauges in a half bridge circuit to compensate temperature effects on axial strain readings of an aluminum pipe. One of the strain gauges is in direction of the axial load and the other one is installed perpendicular to the first one. When I heat up the aluminum pipe, without mechanically loading the pipe no changes in output voltage should be observed, right? But when I heat up the pipe, I get an increase in output voltage as if I'm compressing the pipe! I expected that any changes in the output voltage due to an increase in temperature should be indicating thermal expansion and not contraction! This aside, I'm using aluminum type strain gauges, they should have no thermal output when they are installed on an aluminum backing material, even in a quarter bridge circuit, right? well, this does not happen, either! What do you think that I'm doing wrong here? thanks.

[purdueMET]

I think you are correct. Thanks very much for noticing this and letting me know.

RMF

[changuischuirris]

Hi, how can apply the thermal output, or or what
Is the polynomial used? I don´t undestand the use of these

[Somnath-jend]

why 3 gauges cant be usd in wheatstone circuit?