Calibration of Temperature Sensors in Dynamic and Steady-State Systems

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Presentation transcript:

Calibration of Temperature Sensors in Dynamic and Steady-State Systems 19th Annual Arizona Space Grant Consortium Symposium Peter Kozak, UA/NASA Space Grant Mentor: Michael Sampogna April 17th, 2010

Objective To determine the temperature of the light emitting diodes (LEDs) from the temperature sensor (LM335) output. ST- LM335 F. M. Mims III, An Inexpensive and Accurate Student Sun Photometer with Light-Emitting Diodes as Spectrally Selective Detectors, Proceedings of the Third Annual GLOBE Conference, 232-239, August 1998.

Source: SGS Thompson Microelectronics The Temperature Sensor ST LM 335 Transistor Output: 10mV / K 1 kΩ V (out) 5V LM 335 Source: SGS Thompson Microelectronics

Procedure -Steady vs. Dynamic Systems LED Temperature vs. Sensor Output

Steady State Analysis

Steady State Linear Regression For T < 287K, The error is approximately constant so the data points may be averaged. For T < 287K, Average Error = 1.66K Uncertainty (95%Confidence) = +/- 0.52 K

Dynamic State Analysis Transition to Steady-State: T = 300K Heating => <= Cooling

Conclusions Dynamic State (T < 300K) Steady State (T > 300K) Cooling: [T(LED) = 0.0071(Ts)^2 - 2.9794(Ts) + 535.19] (K) Heating: [T(LED) = -0.0029(Ts)^2 - 2.3137 (Ts) - 153.08] (K) Steady State (T > 300K) [T(LED) = 0.841(Ts) + 47.541] (K) Uncertainty U = +/- 0.52 K R = 0.97

I would like to thank the following for their support and assistance: -Michael Sampogna -Anthony Pitucco -Forrest Mims III -Arizona Space Grant Consortium -University of Arizona -Pima Community College