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Remote measurement of temperatures between 300K-2000K
Ashley Emanuelle Wiratno & Cham Sher Min Beth Methodist Girls’ School
Introduction
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temperatures between 300K-2000K Ashley Emanuelle Wiratno & Cham - - PowerPoint PPT Presentation
temperatures between 300K-2000K Ashley Emanuelle Wiratno & Cham - - PowerPoint PPT Presentation
Remote measurement of temperatures between 300K-2000K Ashley Emanuelle Wiratno & Cham Sher Min Beth Methodist Girls School 1 Introduction 2 Objectives Improving the accuracy of contactless infrared temperature sensors
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Objectives
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- Improving the accuracy of contactless infrared
temperature sensors
- Increase the effectiveness and usefulness of
contactless temperature sensors.
- Calibration of sensors
○ to display the information on a separate webpage wirelessly
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Background Information
- Black bodies are theoretically perfect emitters and
absorbers of radiation
- Stefan-Boltzmann Law formula, P = єσAT4
○ Radiation is proportional to 4th power of temperature
- Planck's law
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Graph of radiation against wavelength according to Planck’s Law
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Background information
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Common errors in infrared temperature sensors include:
- Not measuring absolute temperature
○ an increase in ambient temperature may cause errors
- Taking the average temperature of too large an
area
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Experimental Process
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MLX90621
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MLX90621
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- The two MLX90621 thermopile arrays
successfully measured the temperature and uploaded a table
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ZTP-135SR
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Calibration
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Graph of the log10 of thermistor resistance (kΩ) against ambient temperature (k)
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Calibration
12 Voltage from multimeter/V Reading on program
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Calibration
13 Voltage /V Temperature of heat source/k
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Control variables Amount Surface area 100 cm2 Distance from heat source 11 cm
Control variables
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Calibration
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11 cm
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Calibration
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Limitations
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Limitations and Further Research
- Our current sensor is only calibrated for a
specific distance and surface area away from the object
- Further research could include the distance
and surface area as variables through the use
- f the Stefan-Boltzmann Law
- The relationship between distance and
surface area
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Acknowledgements
We would like to show our gratitude to Professor Lee Choon Keat Paul for his guidance on this
- project. We would like to thank Mr Lim Lee for his
- support. We would also like to acknowledge
Nanyang Technological University and the National Institute of Education for for organising the Nanyang Research Programme Junior.
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