<ul><li>WELCOME </li></ul>
<ul><li>SILICON-CARBIDE BASED TEMPERATURE SENSOR USING OPTICAL PYROMETRY AND LASER INTERFEROMETRY </li></ul>
<ul><li>Temperature is one of the most fundamental parameter. </li></ul><ul><li>Temperature measurement is necessary in mo...
USES FIRING TEMPERATURE OF 1430°C
COMBUSTION SECTION TEMPERATURE IS 1500°c
<ul><li>TEMPERATURE RANGE </li></ul><ul><li>THERMISTOR (-100 to 300 °C) </li></ul><ul><li>RTD  (-250 to 850 °C) </li></ul>...
<ul><li>DISADVANTAGES OF THERMOCOUPLE </li></ul><ul><li>Direct contact to harsh environment </li></ul><ul><li>Develop crac...
<ul><li>RELIABLE SOLUTION </li></ul><ul><li>Silicon carbide based system will  </li></ul><ul><li>be a reliable solution </...
<ul><li>OPTICAL PYROMETERY Non-contacting method for measuring thermal radiation </li></ul><ul><li>LASER INTERFEROMETRY wh...
<ul><li>PYROMETER </li></ul><ul><li>A pyrometer is a non-contacting device that intercepts and measures thermal radiation ...
<ul><li>INTERFEROMETRY </li></ul><ul><li>Makes use of the principle of superposition </li></ul><ul><li>Combination of diff...
 
<ul><li>TUNABLE LASER </li></ul><ul><li>Laser whose wavelength of operation can be altered in a controlled manner. </li></...
<ul><li>Silicon carbide (SiC), also known as carborundum. </li></ul><ul><li>Compound of silicon and carbon with chemical f...
 
<ul><li>A  beam splitter  is an optical device that splits a beam of light in two. </li></ul><ul><li>half of the light inc...
<ul><li>Convert light signals to a voltage or current </li></ul><ul><li>The absorption of photons creates electron hole pa...
<ul><li>Optical filters selectively transmit light having certain properties  </li></ul><ul><li>They are of different type...
 
λ = emitted radiation wavelength T= temperature H= planks constant(6.62606957×10 −34) C= speed of light K= boltzmann’s con...
As= SENSOR SPECIFIC CONSTANT € = SPECIFIC EMISSIVITY OF SiC C= hc/k
R=ratio of power output; α  ,  β   =constants determined by sensor calibration; T=temperature;
FINDING  α  AND  β
R VS T (calibration  curve) FIG:2
<ul><li>Using the R vs. T calibration curve, we can find the course temperature value. </li></ul><ul><li>By measuring R an...
P VS T CURVE
P VS  λ  CURVE
Pmin AND Pmax LOCALIZED MINMUM AND MAXIMUM POWER VALUES
 
<ul><li>It measured temperature with: </li></ul><ul><li>0.1°c resolution </li></ul><ul><li>.44% accurate than thermocouple...
<ul><li>Wikipedia </li></ul><ul><li>http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5361373 </li></ul><ul><li>N. A...
<ul><li>THANK U </li></ul>
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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

  1. 1. <ul><li>WELCOME </li></ul>
  2. 2. <ul><li>SILICON-CARBIDE BASED TEMPERATURE SENSOR USING OPTICAL PYROMETRY AND LASER INTERFEROMETRY </li></ul>
  3. 3. <ul><li>Temperature is one of the most fundamental parameter. </li></ul><ul><li>Temperature measurement is necessary in most industrial plants for controlling processes. </li></ul><ul><li>Especially in gas turbines we need very high temperature measurement systems. </li></ul>INTRODUCTION
  4. 4. USES FIRING TEMPERATURE OF 1430°C
  5. 5. COMBUSTION SECTION TEMPERATURE IS 1500°c
  6. 6. <ul><li>TEMPERATURE RANGE </li></ul><ul><li>THERMISTOR (-100 to 300 °C) </li></ul><ul><li>RTD (-250 to 850 °C) </li></ul><ul><li>THERMOCOUPLE (-200 °C to 2000 °C ) </li></ul><ul><li>Usually thermocouples are using for industrial applications. </li></ul><ul><li>But its lifetime is limited . </li></ul>
  7. 7. <ul><li>DISADVANTAGES OF THERMOCOUPLE </li></ul><ul><li>Direct contact to harsh environment </li></ul><ul><li>Develop cracks in insulation </li></ul><ul><li>Picks moisture </li></ul><ul><li>Become conductive and explodes </li></ul>
  8. 8. <ul><li>RELIABLE SOLUTION </li></ul><ul><li>Silicon carbide based system will </li></ul><ul><li>be a reliable solution </li></ul><ul><li>Melting Temperature ~ 2500 °C </li></ul><ul><li>Natural Interferometer Chip </li></ul><ul><li>High Refractive Index ~2.55 </li></ul><ul><li>Mechanically robust </li></ul>
  9. 9. <ul><li>OPTICAL PYROMETERY Non-contacting method for measuring thermal radiation </li></ul><ul><li>LASER INTERFEROMETRY which makes use of principle of super position </li></ul>
  10. 10. <ul><li>PYROMETER </li></ul><ul><li>A pyrometer is a non-contacting device that intercepts and measures thermal radiation </li></ul><ul><li>A pyrometer has an optical system and detector </li></ul><ul><li>optical system focuses the thermal radiation onto the detector </li></ul><ul><li>The output signal of the detector is related to the thermal radiation </li></ul>
  11. 11. <ul><li>INTERFEROMETRY </li></ul><ul><li>Makes use of the principle of superposition </li></ul><ul><li>Combination of different waves will have some meaningful property </li></ul><ul><li>Resulting pattern is determined by the phase difference between the two waves </li></ul><ul><li>In phase will undergo constructive interference </li></ul><ul><li>Out of phase will undergo destructive interference. </li></ul>
  12. 13. <ul><li>TUNABLE LASER </li></ul><ul><li>Laser whose wavelength of operation can be altered in a controlled manner. </li></ul><ul><li>santec TSL-210 </li></ul><ul><li>tunning range(1520-1600nm) </li></ul>
  13. 14. <ul><li>Silicon carbide (SiC), also known as carborundum. </li></ul><ul><li>Compound of silicon and carbon with chemical formula SiC </li></ul><ul><li>It is used as a black body radiater </li></ul>
  14. 16. <ul><li>A beam splitter is an optical device that splits a beam of light in two. </li></ul><ul><li>half of the light incident through face of the cube is reflected and the other half is transmitted due to total internal reflection </li></ul>
  15. 17. <ul><li>Convert light signals to a voltage or current </li></ul><ul><li>The absorption of photons creates electron hole pairs which creates proportional voltage. </li></ul>
  16. 18. <ul><li>Optical filters selectively transmit light having certain properties </li></ul><ul><li>They are of different types like band pass, band reject, high pass, low pass etc.. </li></ul><ul><li>Optical filters: </li></ul><ul><li>F1= 10LF30-1550 </li></ul><ul><li>F2= 10LF30-1300 </li></ul>
  17. 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
  18. 21. As= SENSOR SPECIFIC CONSTANT € = SPECIFIC EMISSIVITY OF SiC C= hc/k
  19. 22. R=ratio of power output; α , β =constants determined by sensor calibration; T=temperature;
  20. 23. FINDING α AND β
  21. 24. R VS T (calibration curve) FIG:2
  22. 25. <ul><li>Using the R vs. T calibration curve, we can find the course temperature value. </li></ul><ul><li>By measuring R and finding corresponding T from the graph. </li></ul>COURSE TEMPERATURE MEASUREMENT
  23. 26. P VS T CURVE
  24. 27. P VS λ CURVE
  25. 28. Pmin AND Pmax LOCALIZED MINMUM AND MAXIMUM POWER VALUES
  26. 30. <ul><li>It measured temperature with: </li></ul><ul><li>0.1°c resolution </li></ul><ul><li>.44% accurate than thermocouple </li></ul><ul><li>But For a different heating environment, the sensor would have to be recalibrated </li></ul>
  27. 31. <ul><li>Wikipedia </li></ul><ul><li>http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5361373 </li></ul><ul><li>N. A. Riza, M. Sheikh, and F. Perez; IEEE Sensors J., vol. 6, pp. 672–685, 2006. </li></ul><ul><li>L. Cheng, A. J. Steckl, and J. Scofield; Devices, vol. 50, pp. 2159–2164, 2003. </li></ul><ul><li>N. A. Riza and M. Sheikh, Opt. Lett., vol. 33, pp. 1129–1131, 2008. </li></ul>
  28. 32. <ul><li>THANK U </li></ul>
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