Projects:2015s1-28 Wireless Rotation Detector

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Supervisors

Honours students


Project objects

Scope

  • Design and construct a portable wireless device which can accurately measure the speed of rotating object.

Specific Aims

  • Design and produce a metamaterial absorber with resonate frequency of 2.4GHz.
  • Design and fabricate a planar dual-antenna which can transmit and receive signals with limited crosstalk.
  • Design a software system which can calculate the rotation speed.

Background & Significance

  • Rotation speed measurement devices widely used in industries.
  • Current popular rotation speed measurement devices, such as laser tachometer, use visible light.
  • Can not use if line of sight blocked.
  • Intend to change – use Electromagnetic Wave instead
Fig. 1: Background & significance


Key Requirements

  • Metamaterial Absorber shall absorb at least 90% (-10db) power at 2.4GHz when it has same polarization with antenna.
  • Dual antennas shall work at 2.4GHz and the crosstalk between 2 antennas shall be less than -40dB.
  • Portable system shall be operational up to 50cm from the rotating object.
  • Portable system shall accurately measure the rotating object in both low and high speed.

Proposed Approaches

  • Method exploited - ‘Divide-And-Conquer’.
  • The entire project can be decomposed into several aspects.
  • Hardware (design required)
  1. Metamaterial Absorber
  2. Dual-Antennas
  • Software
  1. Calculation Algorithm for rotating speed
  2. GUI
  • Other Components (from market or school)
  1. VCO
  2. Arduino UNO Board
  3. Power Detector


Hardware Design

  • Understand the requirements and specifications of the hardware
  • Design the hardware in software such as HFSS
  • Fabricate the designed hardware
  • Measure the prototype and compare the measured results with simulation results
  • Redesign if the prototype does not meet requirements
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Software Design

  • Software design will start after antenna and absorber design has been finished.
  • Software – in C language, based on the Fourier Transform
  • Combine software, hardware and other components together and measure the rotating speed.
  • Redesign if the measured speed and real speed are not identical.

Entire System

  • The entire system is the integration of all several aspects.
  • Use ‘Waterfall’ model for the system design.
alt text

Schedule and Milestone

  • Milestone in Semester 1
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  • Milestone in Semester 2
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Reference

[1] C.A Balanis, “Antenna Theory Analysis and Design”, 3rd ed., New York: Wiley, 2005. [2] “Arduino FFT Library”, openmusiclabs, Available: http://wiki.openmusiclabs.com/wiki/ArduinoFFT. [3] D. Schurig, J.J. Mock, and D. R. Smith, “Electric-filed-coupled resonators for negative permittivity metamaterials”, Appl. Phys. Lett. 88, art. no. 041109(2006). [4] Y. Chen, “Wireless Rotation Detector for Sport Equipment”, 2014. [5] T. Mark, “System Overview,” Wireless Rotation Detector for Sport Equipment, 2014, pp 6-8. [6] H. M. Lee, “Absorption Bandwidth-Enhanced Metamaterial absorber Using In-planed ELC resonator and Cut-Wire,” available: http://ournal.sapub.org/eee [Accessed: 22 March 2015] [7] A. Grasso, Notes of Project Management for Electrical Engineering & Sustainable Energy, 2014. [Online]. Available: https://myuni.adelaide.edu.au/bbcswebdav/pid-5997024-dt-content-rid-6342045_1/courses/3420_ELEC_ENG_COMBINED_0001/Project%20Management%20%283024%20%26%203029%29%20Lecture%20Notes_2014.pdf

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