Design, make, test and evaluate a strain gauge sensor Essay

These ar my preliminary results that helped me to understand the physics and approach needed to set about my prove successful. In exp1, 3 and 4 I used the same fit and exp2 was a fresh cable. Clearly u roll in the hay gather the set of results obtained in exp2 were different to the other sets of data. After a outfit stretches the wire Changes State and becomes a harder material, meaning it will stretch less the next time u concur a strain. in that respectfore in my real experiment I used fresh wire for to each one experiment. Trend In GraphsFrom the graphs u piece of ass see a general trend formed in exp2, as weight is applied the potential drop crossways the rest of the circuit decreases, therefore increasing across the wire. In the other three experiments u can see weight has little or no effect on voltage, thus showing the wire has already been stretched. This can be seen in map 1. Results I involve used Ohms law which is a formula, to get a vindication for my res ults. R= V/I try one Experiment 2 Experiment 3 space of Constantine wire (cm) Voltage (v) Resistance (ohms) Voltage (v) Resistance (ohms) Voltage (v) Resistance (ohms).Experiment 4 Experiment 5 Length of Constantine wire (cm) Voltage (v) Resistance (ohms) Voltage (v) Resistance (ohms) 1The anomalies are in red. I have also carried come out of the closet a further experiment to find out how there is a general increase in voltage and safeguard across a wire as it becomes longer. These results plump for the prediction I have made before hand. I predicted that the longer the wire the greater the protection will be and then more energy will be needed to push the electrons through. directly I can carry out my experiment, knowing current and voltage will increase as strain is applied on the wire.Results 1st Set Length Of Wire/(mm) Current/(milliamps) Weight/(grams) Power, voltage/(millivolts) Start8off scale 700 254 This is my for the first time set of results, which I believe to b e the most accurate. As u can see there is a clear trend in the increase of current and voltage. There are no anomalies in this experiment. 2nd Set Length Of Wire/(mm) Current/(milliamps) Weight/(grams) Power, voltage/(millivolts) Start8ObservationsThere was only one major observation and that was to see how the wire stretched as more weight was applied. As more weight was applied the wire slowly stretched until its deformation point. The deformation point is where the wire is stretched or re-shaped so much it cannot return to its original state. Accuracy of Results The accuracy that I achieved was very high steady though I had very little time. Also I got lots of results to make a vertical analysis. The level of accuracy in this investigation was as high as I could get.The only matter I could of improved was to use more weights and measure every 50grams however this may have taken too long to achieve. I got someone else to check the rendition on the meters to be sure I was re ading them correctly. Before taking each reading I would also check the connections were crisp betwixt the wire and the rest of the circuit. I could change one or two thing during this experiment. A some examples of these could be the thickness of the wire, the type of wire for example copper and gold. We made sure to limit out systematic error by valuing all the results a 0 for 0 weight.This way only my proclaim human judgement can effect the quality of the results. A random error could of included, when I was reading the results someone knocked or a change in the gravitational field, effected the weight. Also a snub wind could of pushed on the weights for that precise second, tiny chance, but possible Analysis First Experiment The first experiment intelligibly went much better then the second as I have a significant and clear trend between the strain, current and voltage. From graph 2 u can clearly see that as u stretch the wire the current and voltage increase.The voltage onl y grows very slowly until the wire is deformed, then the electrons need much more energy to move across the wire (large increase in impedance). The sharp slope proves this in Chart 2. Chart 3 and Chart 4 show this in much more detail. In Chart 3 u can see where the wire snaps because the stain is too much for it to withstand. Therefore from the first experiment we can see that my theory and hypothesis is proven. Chart 8 shows the general pattern between voltage and current and how resistance increases. Between point 6 and 7 on the X-axis the wire has deformed and resistance has greatly increased.The wire has stretched 45mm, which also increase resistance. Second Experiment There is one major anomaly in experiment 2 and that is when 100grams were placed on. The reading of power/voltage and current are much too high. On Chart 5 and 6 I have draw a pencil line which I believe should have been the results gained. The general trend again shows that as u stretch the wire the resistance a cross it increases. Chart 7 shows the general pattern between voltage and current and how resistance increases. evaluation A strain gauge can predict when a wire or something with applied examine or stain will deform or even break.When the voltage and current increases in a wire it must mean resistance has also increased. Improvements If I were to do the experiment again, I could make some improvements to make the level of accuracy better. For example, I could make sure that the joints/connections were jointed properly and would have to make sure I use the same equipment every time. I could also get a machine to measure the length of the fine wire. I would also take more than two sets of results, which would manage any factors of anomalies and would therefore make the experiment a lot more reliable.