Figure Q1(a) capacitance based motion sensor. (b) Measurands are physical properties that can be measured. Give three ex

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Figure Q1 A Capacitance Based Motion Sensor B Measurands Are Physical Properties That Can Be Measured Give Three Ex 1 (72.18 KiB) Viewed 11 times

Figure Q1(a) capacitance based motion sensor. (b) Measurands are physical properties that can be measured. Give three examples of mechanical properties explaining a method by which they can be measured. [5] (c) A repeating signal is to be acquired by a 10-bit ADC with a 0-5V input range. The signal from the sensor is obscured by random noise, which has a standard deviation of 100mV. How many averages need to be taken so that the standard deviation of the noise in the final signal is reduced to 5 times the quantisation noise that will be introduced by the ADC during the digitising process. [5] (d) A NTC thermistor is used to measure the temperature of a device. The resistance at an unknown temperature is 5.75k. If the device has a nominal resistance of 10k at room temperature (25 degrees Celsius) and a ß parameter of 3435 Kelvin. What is the current temperature of the device in degrees Celsius? [5] (e) Explain the terms 'transduction' and 'recognition' in the context of chemical sensing, giving an example relating to each term. [5] (f) Figure Q1(f) shows a signal from a sensor. What different signal classes does this signal belong to? Give reasons for your choices. [5]