SILICON-CARBIDE BASED TEMPERATURE SENSOR USING OPTICAL PYROMETRY AND LASER INTERFEROMETRY
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SILICON-CARBIDE BASED TEMPERATURE SENSOR USING OPTICAL PYROMETRY AND LASER INTERFEROMETRY

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SILICON-CARBIDE BASED TEMPERATURE SENSOR USING OPTICAL PYROMETRY AND LASER INTERFEROMETRY Presentation Transcript

  • 1.
    • WELCOME
  • 2.
    • SILICON-CARBIDE BASED TEMPERATURE SENSOR USING OPTICAL PYROMETRY AND LASER INTERFEROMETRY
  • 3.
    • Temperature is one of the most fundamental parameter.
    • Temperature measurement is necessary in most industrial plants for controlling processes.
    • Especially in gas turbines we need very high temperature measurement systems.
    INTRODUCTION
  • 4. USES FIRING TEMPERATURE OF 1430°C
  • 5. COMBUSTION SECTION TEMPERATURE IS 1500°c
  • 6.
    • TEMPERATURE RANGE
    • THERMISTOR (-100 to 300 °C)
    • RTD (-250 to 850 °C)
    • THERMOCOUPLE (-200 °C to 2000 °C )
    • Usually thermocouples are using for industrial applications.
    • But its lifetime is limited .
  • 7.
    • DISADVANTAGES OF THERMOCOUPLE
    • Direct contact to harsh environment
    • Develop cracks in insulation
    • Picks moisture
    • Become conductive and explodes
  • 8.
    • RELIABLE SOLUTION
    • Silicon carbide based system will
    • be a reliable solution
    • Melting Temperature ~ 2500 °C
    • Natural Interferometer Chip
    • High Refractive Index ~2.55
    • Mechanically robust
  • 9.
    • OPTICAL PYROMETERY Non-contacting method for measuring thermal radiation
    • LASER INTERFEROMETRY which makes use of principle of super position
  • 10.
    • PYROMETER
    • A pyrometer is a non-contacting device that intercepts and measures thermal radiation
    • A pyrometer has an optical system and detector
    • optical system focuses the thermal radiation onto the detector
    • The output signal of the detector is related to the thermal radiation
  • 11.
    • INTERFEROMETRY
    • Makes use of the principle of superposition
    • Combination of different waves will have some meaningful property
    • Resulting pattern is determined by the phase difference between the two waves
    • In phase will undergo constructive interference
    • Out of phase will undergo destructive interference.
  • 12.  
  • 13.
    • TUNABLE LASER
    • Laser whose wavelength of operation can be altered in a controlled manner.
    • santec TSL-210
    • tunning range(1520-1600nm)
  • 14.
    • Silicon carbide (SiC), also known as carborundum.
    • Compound of silicon and carbon with chemical formula SiC
    • It is used as a black body radiater
  • 15.  
  • 16.
    • A beam splitter is an optical device that splits a beam of light in two.
    • half of the light incident through face of the cube is reflected and the other half is transmitted due to total internal reflection
  • 17.
    • Convert light signals to a voltage or current
    • The absorption of photons creates electron hole pairs which creates proportional voltage.
  • 18.
    • Optical filters selectively transmit light having certain properties
    • They are of different types like band pass, band reject, high pass, low pass etc..
    • Optical filters:
    • F1= 10LF30-1550
    • F2= 10LF30-1300
  • 19.  
  • 20. λ = emitted radiation wavelength T= temperature H= planks constant(6.62606957×10 −34) C= speed of light K= boltzmann’s constant(1.380 64×10 −23) ACCRODING TO PLANK’S LAW
  • 21. As= SENSOR SPECIFIC CONSTANT € = SPECIFIC EMISSIVITY OF SiC C= hc/k
  • 22. R=ratio of power output; α , β =constants determined by sensor calibration; T=temperature;
  • 23. FINDING α AND β
  • 24. R VS T (calibration curve) FIG:2
  • 25.
    • Using the R vs. T calibration curve, we can find the course temperature value.
    • By measuring R and finding corresponding T from the graph.
    COURSE TEMPERATURE MEASUREMENT
  • 26. P VS T CURVE
  • 27. P VS λ CURVE
  • 28. Pmin AND Pmax LOCALIZED MINMUM AND MAXIMUM POWER VALUES
  • 29.  
  • 30.
    • It measured temperature with:
    • 0.1°c resolution
    • .44% accurate than thermocouple
    • But For a different heating environment, the sensor would have to be recalibrated
  • 31.
    • Wikipedia
    • http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5361373
    • N. A. Riza, M. Sheikh, and F. Perez; IEEE Sensors J., vol. 6, pp. 672–685, 2006.
    • L. Cheng, A. J. Steckl, and J. Scofield; Devices, vol. 50, pp. 2159–2164, 2003.
    • N. A. Riza and M. Sheikh, Opt. Lett., vol. 33, pp. 1129–1131, 2008.
  • 32.
    • THANK U