June 16, 2002
June 16, 2002
June 19, 2002
7.924.1 - 7.924.17
Position Detector Project
Nghia T. Le, Terrence P. O’Connor Electrical Engineering Technology Purdue University
This paper discusses the design of a project used in a second year course of Electrical Engineering Technology at Purdue University. The design reviews material that has been covered in the first few analog courses at the University to help students link their knowledge together.
The project uses a variable capacitor that has a rotating plate. The circuit detects the variation in the capacitor. The block diagram of the design is in Figure 1 below.
SINE WAVE WINDOW OSCILLATOR COMPARATOR
RC WHEATSTONE INSTRUMENTATION ACTIVE BANDPASS ACTIVE PEAK WINDOW BRIDGE AMPLIFIER FILTER RECTIFIER DETECTOR COMPARATOR
Figure 1 – Block Diagram of the Project
B. The Position Detector Project
1. The Variable Capacitor
The key component of the design is a variable capacitor. It consists of two 8cm by 5cm conduction plates that are place 1mm (0.001m) apart as in Figure 2 on the next page.
The bottom plate is affixed and the top plate rotates about the shaft that results in different plate areas. The capacitance is:
C= ( Ae r 8.85 ´ 10 -12 F / m ) d
Proceedings of the 2002 American Society for Engineering Education Annual Conference & Exposition Copyright©2002, American Society for Engineering Education
O'Connor, T., & Le, N. (2002, June), Position Detector Project Paper presented at 2002 Annual Conference, Montreal, Canada. 10.18260/1-2--11036
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