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Experiment to investigate how the resistance of a strain gauge attached to a piece of wood varies with the temperature of the wood.

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Introduction

Experiment to investigate how the resistance of a strain gauge attached to a piece of wood varies with the temperature of the wood.

Aim: The aim of this experiment is to work out the resistance of a strain gauge that has been attached to piece of wood (the same material wood as used in flooring), and see how it varies with its temperature

Procedure.

    To measure the resistance of the block of wood I will use an ammeter to measure the current and a voltmeter to measure the potential difference, and after reading the values, I shall use the equation,

Resistance =Voltage/Current, which will allow me to work out the resistance of the strain gauge.image00.png

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Middle

image01.png

  I will attach the thermocouple to a millivoltmeter to read the potential difference across it. First I will have to calibrate the thermo couples by heating them up and measure temperature against PD and plot a calibration graph.

I shall have to stick the wood block on to the strain gauge using a substance called Cyanoacrylate, ref 2 or more commonly known as super glue, as this is a very strong adhesive it will stick to the wood strongly.

    On the strain gauge I shall attach the second thermo couple device, this way I shall always have a reading of the resistance of the strain gauge.image02.png

 In order to get

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Conclusion

image03.png

   In order to get a reliable experiment it would be best to execute this experiment at least 3 times and making an average of the results and using them to make a graph. I will plot a graph of resistance versus temperature for each of the thermocouples to show the resistance at the two points of contact.

  For safety I will handle the wood, wires with gloves as they will be very hot after being heated. Also make sure that I connect the wires in the correct way to prevent the malfunction of components.image04.png

Reference:

1. http://www.huntsman.com/advanced_materials/Media/Aral_2000_(English).pdf

2. http://en.wikipedia.org/wiki/Cyanoacrylate

Asad Shahid 12LR



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