Wireless Temperature Sensor Performance
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1 Wireless Temperature Sensor Performance Standards Certification Education & Training Publishing Conferences & Exhibits Otto J. Gregory, John Conkle, Thomas Birnbaum
2 Presenter Dr. Otto J. Gregory Distinguished Engineering Professor at the University of Rhode Island and the founder and Director of the URI Center for Sensors and Instrumentation Research. Prior to this, he was Director of the Rhode Island Center for Thin Film and Interface Research, a joint Brown University-University of Rhode Island NSF Engineering Center of Excellence. He has held several administrative positions at the University of Rhode Island, including Associate Dean of Research and Graduate Studies. During the past twenty five years, his research has focused on thin film sensors for harsh environments, specifically for advanced instrumentation for gas turbine engines. Dr. Gregory has published more than 85 peer reviewed journal articles in high temperature materials science, which has provided the background for 22 US Patents. Currently, Dr. Gregory is developing passive wireless strain and temperature sensors for the gas turbine engine environment and thin film strain and temperature sensors for CMC s. 2
3 Outline Introduction how the wireless temperature sensor works components of the wireless temperature sensor Experimental Results Summary characterization of wireless sensor components integrated sensor performance characterization of engine environment
4 Wireless Temperature Sensor: passive wireless sensor concept Thin film sensors can operate up to 1150C
5 System Interrogation Concept 5
6 How does the passive wireless temperature sensor work? 6
7 Wireless Temperature Sensor: characteristics of the passive thin film sensor Wireless sensor is passive: requires no power to operate Wireless sensor can operate in the hot section of gas turbine engines without affecting gas flow path.thin film integrated sensor has extremely low profile (well within boundary layer thickness) Wireless sensor can be printed on a blade or other component surface using lithography / thin film deposition Wireless sensor has a small footprint and thermal mass: will not affect vibrational characteristics of the blades, exhibits a rapid response and can measure the true surface temperature of components 7
8 Wireless Temperature Sensor: Components of passive sensor Antenna Enables the interrogating signal to be received Determines the frequency of operation of the sensor Enables the return signal to be transmitted back the the Tx/Rx/Signal Processing Diode Produces RF harmonics of the interrogating signal (as filtered by the antenna) which allow the return signal to be easily separated from the interrogating signal by the Tx/Rx/Signal Processing Dielectric (Alumina or TBC) Establishes the desired temperature-dependent electrical properties (DK, dielectric constant) which alters the antenna center frequency as the temperature changes Wireless Sensor Technologies, LLC Proprietary and Confidential 8 8
9 Wireless Temperature Sensor; Equivalent Circuit 9
10 Alumina DK Temperature Dependence Measured dielectric constant temperature dependence for alumina -- Literature value dielectric constant temperature dependence for alumina * Dielectric properties of alumina ceramics in the microwave frequency at high temperature, Kim. et.al., Solid State Phenomena Vols , p (2007) 10
11 Measured DK of YSZ TBC Does TBC possess similar DK temperature dependence? Experiments showed that yttria stabilized zirconia (YSZ) is acceptable for wireless temperature sensor operation Dielectric Constant Temperature (deg C) Wireless Sensor Technologies, LLC Proprietary and Confidential 11 11
12 Thin Film Schottky Diode: RF Harmonic Output as a Function of Temperature 12
13 Thin Film Schottky Diode: RF Harmonic Output as a Function of Frequency 13
14 Wireless temperature sensors: w/ high purity alumina dielectric diodes thin film antennae embedded wire thermocouples
15 Wireless temperature sensor: testbed showing sensor/heater configuration
16 Wireless Temperature Sensor: Test Apparatus 16
17 Typical Wireless Sensor Peak Response 17
18 Typical Two Sensor Peak Response Room temperature
19 Wireless Temperature Sensor Response: Sensor Output as a Function of Temperature and Frequency
20 Wireless Temperature Sensor Response: Sensor Output as a Function of Temperature Measured accuracy of current generation sensor is 4.38ºC (1σ) Hysteresis 0 (less then the resolution of our test equipment) 20
21 Signal Processing and Turbine Section Propagation Measurements 3 rd order polynomial curve fit Calibration table onetime calibration per sensor geometry Temperature estimation algorithm.noise/multipath/ doppler.signal strength variation due to environment Propagation measurements taken on 10/7/11 at Honeywell Usable signal from sensor over about +/- 30 deg sector from probe antenna location. 21
22 Coupling Between Probe Antenna and Sensor; Antenna Sensor on Blade Directly Over Probe horizontal scale is MHz
23 Coupling Between Probe Antenna and Sensor; Antenna Sensor 4 Blades from Probe horizontal scale is MHz
24 Coupling Between Probe Antenna and Sensor; Antenna Sensor 12 Blades from Probe horizontal scale is MHz
25 Summary A passive wireless thin film sensor has been demonstrated to 560ºC that requires no power to operate and exhibits ideal characteristics for remote temperature sensing The wireless temperature sensor was designed to withstand the harsh environment of the hot section in turbine engines; robust diodes, antennae, interconnects and dielectric The sensor frequency changes as a function of temperature and shows no hysteresis upon heating and cooling WTS is particularly useful in applications where the surface temperature of rotating components is desired and where the routing of wires to a data acquisition system to complete the measurement is too difficult or complex. 25
26 Acknowledgements Navy SBIR N08-004, N C-0267, Thin-film High Temperature Sensors, TPOC Dr. Richard Millar, Phone: , Core R&D supported by: Air Force, UTC Subcontract, Nondestructive Evaluation Technology Initiatives Program (Wireless Sensors for Extreme Conditions Task), TPOC - Dr. Charles Ed Stutz, AFRL/RXPS, Charles.stutz@wpafb.af.mil DOE SBIR, "Self Powered Wireless Sensor System for Power Generation Applications, TPOC Ms. Susan Maley, DOE NETL, susan.maley@netl.doe.gov Thank You! 26
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