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wireless strain sensors

wireless strain sensors. By: Jevaughn Julius Supervising Professor: Dr. J.C. Chiao & Dr. smitha rao JULY 16, 2013. objectives. To create a wireless sensor system to monitor and measure strain at any flexing region.

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wireless strain sensors

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  1. wireless strain sensors By: Jevaughn Julius Supervising Professor: Dr. J.C. Chiao& Dr. smitharao JULY 16, 2013

  2. objectives • To create a wireless sensor system to monitor and measure strain at any flexing region. • Main focus on measuring the strain caused on the membranes of human stomachs and the joints on different fingers. • Use LabVIEW and embedded coding to convert the signals digitally from the sensors and display on a computer wirelessly.

  3. Test setup • DupontKapton Polyimide Film (1) • Silver Conductive Epoxy (2) • Digital Multimeter (3) • PiezoresistiveSensors (4) • Kerrigan-Lewis Coil Wire (5) (3) (4) (2) (5) (1)

  4. Piezoresistive strain sensors • All sensors are encapsulated in PDMS:Polydimethylsiloxane

  5. Method: • The sensor is not kept at the joint, but instead a piece of Kapton sheet which is attached to the sensor is kept over the joint. • When the finger is bent, the Kapton sheet bends. This stretches the sensor attached to the sheet and thereby gives a better sensitivity.

  6. Pdms encapsulation

  7. Strain sensor glove • The sensitivity achieved by this method is far more better than the one achieved by keep the sensor at the joint.

  8. Since the sensor is stretching instead of bending, we are able to calculate the Gauge Factor of the sensor.

  9. Gauge factor graph

  10. Going wireless

  11. EZ430-RF2500 (wireless system)

  12. Next step • To continue to work make strain sensors wireless and apply them at different areas to the human body. • Trying to apply Wheatstone Bridge to our wireless system.

  13. Questions AND answers

  14. references • Tata, Uday, Hung Cao, VaibhavLandge, Cuong M. Nguyen, and J.-C. Chiao. "Wireless Strain Sensor Based on Amorphous Carbon for Human-Motion Detection." N.p., 20-23 Jan. 2013. Web. 22 June 2013. • "The Strain Gage." Sensors, Thermocouple, PLC, Operator Interface, Data Acquisition, Rtd. N.p., n.d. Web. 6 July 2013. <http://www.omega.com/literature/transacti • "EZ430-RF2500 Texas Instruments | 296-23031-ND | DigiKey." DigiKey Electronics - Electronic Components Distributor. N.p., n.d. Web. 14 July 2013. <http://www.digikey.com/product-detail/en/EZ430-RF2500/296-23031-ND/1785839>.

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