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Short Answer type Questions:

Final Exam Guide. Short Answer type Questions: What is a Pirani gauge used for? Explain with a diagram how a Pirani gauge works. Mention an example of a popular microphone.

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Short Answer type Questions:

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  1. Final Exam Guide Short Answer type Questions: What is a Pirani gauge used for? Explain with a diagram how a Pirani gauge works. Mention an example of a popular microphone. What are the regions of operation of an ionization based radiation detector. What is the region that can give the best energy resolution, and what is the one with no energy resolution? What is the major advantage of semiconductor based radiation detectors? Give an example of an emerging semiconductor material for radiation detection. Mention two advantages of this material in detecting radiation. Mention a major challenge. Three major classes of chemical analytes are ………….., ……………, and ……………… Mention 3 property change that chemical or biological sensors are based on. What is a major challenge for a bio-sensor compared to a chemical sensor? To sense a mixture of several toxic gases/environemntal pollutants what kind of miniaturized chemical sensors are commonly used? Why? Mention two major disadvantages of these sensors. What are the applications of a cantilever sensor? What are the major modalities for cantilever sensing? Which one of these modalities have the best sensitivity? What are the major sources of noise in a microcantilever?

  2. Final Exam Guide Problems: Calculate the Johnson noise and thermomechanical noise for a cantilever. R = 1 KOhm, B= 1Hz, Q = 100, k = 1 N/m, 0 = 100 KHz. What is the total noise in terms of amplitude at resonance? Calculate the voltage sensitivity for a Si piezoresistive cantilever arranged in a wheatstone bridge configuration. Use the constants in the next slide. Compare the deflection sensitivity with that of a GaN cantilever with AlGaN/GaN HFET at the base for deflection detection. Assume change in 2DEG = change in polarization charge. Neglect variation in stress along Z-direction, and perfect confinement of charge in a plane. How does the inclusion of an HFET at the base help instead of a simple resistor?

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