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• Level: GCSE
• Subject: Maths
• Word count: 1967

# Investigate and test a strain gauge sensor using different materials.

Extracts from this document...

Introduction

Investigate and test a strain gauge sensor using different materials.

## Aim

To test and evaluate a sensor using two materials, (steel and wood) to determine the sensitivity and accuracy. Response time and reliability of the sensor will also be tested and the ability of the sensor to detect small changes will show in the results.

## Research

A strain gauge is a device capable of translating a deformation (strain) into an electrical signal. This can also be used to measure force, pressure load or weight.

Strain =Extension

Area

The above equation is used to calculate the strain and has no units because they are cancelled out (meters/meters=nothing).

A strain gauge is connected in a wheatstone bridge it consists of 4 resistors arranged in a diamond orientation. An input DC voltage is applied between the top and bottom of the diamond and the output voltage is measured across the middle.

When the output voltage is zero, the bridge is said to be balanced. As the resistance of one of the leg changes, balanced bridge is now unbalanced. The unbalance causes a voltage to appear across the middle of the bridge. This voltage may be measured with a voltmeter.

The strain gauge it self works when stretched this increases the length therefore resistance increases, according to the relationship: Resistance=resistivity*Length.

Area

Middle

100

3.75

 Weight (g) P.D (v) 10 0.43 20 0.85 30 1.28 40 1.64 50 2.05 60 2.47 70 2.8 80 3.25 90 3.54 100 3.76

## Wood

 Weight (g) P.D (v) 10 0.07 20 0.17 30 0.33 40 0.5 50 0.69 60 0.85 70 0.97 80 1.14 90 1.3 100 1.49

 Weight (g) P.D (v) 10 0.06 20 0.16 30 0.33 40 0.5 50 0.69 60 0.86 70 0.96 80 1.13 90 1.3 100 1.48

 Weight (g) P.D (v) 10 0.08 20 0.16 30 0.34 40 0.5 50 0.69 60 0.87 70 0.97 80 1.14 90 1.31 100 1.49

 Weight (g) P.D (v) 10 0.07 20 0.17 30 0.35 40 0.5 50 0.69 60 0.86 70 0.97 80 1.13 90 1.3 100 1.49

 Weight (g) P.

Conclusion

## Bibliography

Advancing Physics Students Text Book

Web Pages.

www.encarta.com

www.micrstrain.com

www.kenyon.edu/depts/physics/EarlyApparatus/Electrical_Measurements/Wheatstone_Bridge/Wheatstone_Bridge.html

www.howstuffworks.com/question626.htm

www.slopeindicator.com/support/strain-gauge/ faq-strain-gauge.html

www.cyronix.com/DNY_instuement_TA204.htm

Circuit Diagram

## Method

First set up the apparatus as shown in the diagram

It is very important that you check that strain gauge is firmly onto the test specimen. This ensures the strain accurately transfers from the test specimen through the adhesive and strain gauge

Attach the weight holder to a string and carefully tie a knot.

Take the reading of the voltmeter.

Start adding weights on

Carefully record the results

Trial Results.

 Weight (g) P.D (v) 10 0.72 20 1.2 30 1.69 40 2.17 50 2.59 60 3.16 70 3.45 80 3.88 90 4.04 100 4.18
 Weight (g) P.D (v) 10 0.76 20 1.17 30 1.69 40 2.18 50 2.58 60 3.00 70 3.39 80 2.75 90 4 100 4.2 Weight (g) P.D (v) 10 0.7 20 1.18 30 1.68 40 2.17 50 2.56 60 3.01 70 3.41 80 3.74 90 4.02 100 4.19

Improvements To Method.

Make sure that the weight holder does not move as the strain gauge sensor is very sensitive and this could affect the results.

Tightly clamp the beam so it in not touching the bench when there is some load on it and also measure the amount of the beam is over the bench as this will vary the results.

This student written piece of work is one of many that can be found in our GCSE Height and Weight of Pupils and other Mayfield High School investigations section.

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