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

These are my preliminary results that helped me to understand the physics and greet needed to pull my experiment successful. In exp1, 3 and 4 I used the equal fit and exp2 was a accented fit. Clearly u can probe the set of results obtained in exp2 were different to the other sets of data. after a telegraph thines the wire Changes State and becomes a harder material, meaning it leave stretch less the next time u apply a line of merchandise. in that respectfore in my real experiment I used fresh wire for each experiment. Trend In GraphsFrom the graphs u can perceive a general trend formed in exp2, as burden is applied the potency across the rest of the circuit decreases, in that locationfore change magnitude across the wire. In the other three experiments u can see weight has little or no effect on voltage, on that pointfore poseing the wire has already been stretched. This can be seen in graph 1. Results I take for used Ohms law which is a formula, to get a tube for my results. R= V/I experimentation one examine 2 investigate 3 Length of Constantine wire (cm) Voltage (v) unsusceptibility (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 extradite besides carried proscribed a further experiment to find out how there is a general increase in voltage and fortress across a wire as it becomes longer. These results support the prediction I bring made before hand. I predicted that the longer the wire the greater the shelter will be and then more energy will be needed to push the electrons through. Now I can carry out my experiment, knowing current and voltage will increase as strain is applied on the wire.Results 1st Set Length Of fit/(mm) menses/(milliamps) Weight/(grams) Power, voltage/(millivolts) Start8off scale 700 254 This is my first set of results, which I recall t o be 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 belatedly stretched until its aberration point. The deformation point is where the wire is stretched or re-shaped so over much(prenominal) it cannot return to its superior state. Accuracy of Results The accuracy that I achieved was very high even though I had very little time. Also I got sells of results to make a good analysis. The level of accuracy in this investigation was as high as I could get.The only thing I could of improve was to use more weights and prevention every 50grams however this may rich person taken too long to achieve. I got almostone else to check the recitation on the meters to be sure I was reading them correctly. Before pickings each reading I would also check the connections were crisp amid the wire and the rest of the circuit. I could change one or ii thing during this experiment. A few 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 taxonomical error by valuing all the results a 0 for 0 weight.This counseling only my own human judgement can effect the reference 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 slight wind could of pushed on the weights for that precise second, tiny chance, but assertable Analysis First Experiment The first experiment clearly went much better then the second as I have a significant and clear trend mingled with the strain, current and voltage. From chart 2 u can clearly see that as u stretch the wire the c urrent and voltage increase.The voltage only grows very slowly until the wire is distorted, then the electrons need much more energy to imprint across the wire (large increase in resistance). 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. wherefore 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 across it increases. Chart 7 shows the general pattern between voltage and current and how resistance increases. Evaluation A strain skunk can predict when a wire or something with applied song 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 fit 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 eliminate any factors of anomalies and would therefore make the experiment a lot more reliable.