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Developing an opacity sensor There is a huge range of different sensors in this world, designed to detect changes in temperature, size, distance and many other important factors. Their ability to do this makes them valuable for use in industry, in particular, production processes. I have chosen to develop a sensor which measures the concentration of solution, suitable for the factory production of pre-diluted fruit squashes. The sensor can control the machinery via a servo-mechanism, indicating whether more squash needs to be added. The context in which my sensor is to be used is an important consideration as it determines a suitable sensitivity and resolution. Factors to consider when designing a sensor: Sensitivity The ratio of change of output to change of input. A very sensitive sensor will give a big change of output for a small change of input. A sensor which detects very small changes of input will need to be very...

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