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Robert J. Moffat
An Overview of the Challenges In Thermal Testing . by Robert J. Moffat, Ph.D.
Today�s engineers require skilled knowledge to effectively plan and respond to the many challenges faced in the thermal testing of electronics. In this lecture, we will focus on temperature measurements in air-cooled systems (surface and coolant) in a reasonably well-equipped lab. We will discuss the application and error characteristics of thermocouples, RTDs, thermistors, IR cameras, and liquid crystals. We will then discuss how to effectivelyplan and execute a set of measurementsthat will answer the question that sent you into the lab and give you an estimate of the measurement uncertainty.� In experiment planning, we will discuss the various parameters to consider, such as identifying the specific questions you are trying to answer; the degree of accuracy required; type of sensors and lab equipment available for thermal testing; and applicable budget constraints.Finally, we will review specific challenges in measurement accuracy and uncertainty, including measurement errors most commonly encountered and the impact of your overall result.�
The following table highlights the Planning and Measurement Challenges to be discussed:
Planning Challenges | To Respond | Action | Example |
Understand the big picture | Look at the overall temperature distribution | Full field imaging | IR camera; liquid crystals (air temp and surface temp) |
Understand your objective | Ask: �What question am I trying to answer?� � | Keep iterating until both you and the customer �sign off� | �Do you mean Tmax or Tavg?�; �Under what conditions-----?�; �If I get the answer, am I done?� |
understand your instrumentation | Know aboutthe errors that might affect your instruments | Read the literature of testing | Quick overview of the theory and practice of TCs, RTDs, Thermistors.(25 min) |
Understand the coolant flow field | Find out where the coolant flow is going | Visualize the flow | Smoke lines, tufts, threads |
Measurement Challenges | Example | To Avoid | Example |
Conduction Error � Gas temp | Gas temp.reading affected by surface temp. | Ensure L/d>20 |
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