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ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors Piezo Vibration Sensor

ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors Piezo Vibration Sensor. Prepared by: Gustavo Estrada Dept. of Electrical and Computer Engineering Utah State University (435)797-3054 (ECE Dept.). 3/11/2010. Outline . Reference list To probe further Major applications

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ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors Piezo Vibration Sensor

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  1. ECE5320 MechatronicsAssignment#01: Literature Survey on Sensors Piezo Vibration Sensor Prepared by: Gustavo Estrada Dept. of Electrical and Computer Engineering Utah State University (435)797-3054 (ECE Dept.) 3/11/2010

  2. Outline • Reference list • To probe further • Major applications • Basic working principle illustrated • A typical sample configuration in application (application notes) • Major specifications • Limitations • And many more relevant issues in applications (such as, how to choose, cost information, where to buy etc.) ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  3. Reference List • A piezoelectric vibration based generator for wireless electronics http://iopscience.iop.org/0964-1726/13/5/018/pdf/0964-1726_13_5_018.pdf • Piezoelectric vibration sensor by Yoshiaki Ohbayashi et al http://www.google.com/patents/about?id=bDKSAAAAEBAJ&dq=piezoelectric+vibration+sensor ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  4. Major Applications • Used in measuring vibrations in various apparatuses such as electric, electronic, instrumental, medical, scientific, mechanical, and in a pedometer or the like • Used as generator in wireless electronics • Used in measuring acceleration, velocity and displacement • Used to measure vibrations at a high precision level ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  5. Basic Working Principal • A piezoelectric vibration sensor may work as a generator. • The piezoelectric vibration sensor converts mechanical energy into electrical energy. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  6. Piezo Vibration Sensor Skematic The skematic shows a doble piezo blade. However The designs may vary, single or doble piezo blade Figure from: http://iopscience.iop.org/0964-1726/13/5/018/pdf/0964-1726_13_5_018.pdf ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  7. Generator Configuration • A piezoelectric vibration sensor is used as generator in communications (wireless) ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  8. Typical Sample Principal A generator prototype used for testing Diagram from: http://iopscience.iop.org/0964-1726/13/5/018/pdf/0964-1726_13_5_018.pdf ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  9. Generator Diagram Figure from: http://iopscience.iop.org/0964-1726/13/5/018/pdf/0964-1726_13_5_018.pdf ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  10. Major Especifications • Efective energy density • Size • Design • Circuit Model • Resons for Design ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  11. Efective Energy Density Diagram from: http://iopscience.iop.org/0964-1726/13/5/018/pdf/0964-1726_13_5_018.pdf ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  12. Energy Density Parameters • σy is the yield stress • k is the coupling coefficient • c is the elastic constant • B is the magnetic field • μ0 is the permeability of free space • ε0 is the permittivity of free space • and E is the electric field ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  13. Testing Results of a Prototype Graph from: http://iopscience.iop.org/0964-1726/13/5/018/pdf/0964-1726_13_5_018.pdf ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  14. Testing Results Graph from: http://iopscience.iop.org/0964-1726/13/5/018/pdf/0964-1726_13_5_018.pdf ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  15. Size • Size constraints play an important role in selecting a power converter configuration. For this reason it is necessary to specify the general size at the outset. While the model developed holds for any size, if a generator an order of magnitude larger or smaller were desired, a different design configuration may be preferred. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  16. Design • A two-layer bender mounted as a cantilever • S is strain • V is voltage • M is mass • z is vertical displacement. Figure from: http://iopscience.iop.org/0964-1726/13/5/018/pdf/0964-1726_13_5_018.pdf ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  17. Circuit Model Figure from: http://iopscience.iop.org/0964-1726/13/5/018/pdf/0964-1726_13_5_018.pdf ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  18. Reasons for Design • First, for a given force input, the cantilever configuration results in the highest average strain, and the power output is closely related to the average strain developed in the bender. • Second, the cantilever mounting results in the lowest resonance frequency for a given size, which is important because the target input vibrations are low frequency (60–200 Hz). ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  19. Limitations • The piezoelectric vibration sensor is limited to use where mechanical energy (vibration) is abalible. • In some applications, such as wireless, the sensors are limited to sizes due to constant demand of reduction in size by industry. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  20. Useful Links for Shopping • Sparkfun Electronics provides a range of sizes and prices for piezoelectric vibration sensors. See links below to view different sensor options • http://www.google.com/patents/about?id=bDKSAAAAEBAJ&dq=piezoelectric+vibration+sensor • http://www.junetrading.com/product_info.php?products_id=5616 • Digikey corporations is another good source to porchase this sensors • http://parts.digikey.com/1/parts/945405-sensor-piezo-film-vibra-mass-0-1005447-1.html ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

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