NDLI: Self Calibrated and High Accuracy Thermal Control in Cavities

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Belo, Francisco Antonio Paz, Marcelo Magalha˜es A´vila Leite, Antonio Pralon Ferreira Nascimento, Leonaldo Jose´ Lira Do
Copyright Year	2005
Abstract	The study of thermal control in different geometry cavities (cylindrical and rectangular), to obtain high accuracy, short and long term stability responses applied to electronic instruments, is presented. Automatic dynamic electrical compensation is achieved by a feedback electronic circuit and low thermal inertia sensors. One sensor element is also employed as an actuator (heat generator) and the other as a reference sensor (resistance of manganine wire). In the rectangular cavity, the transducer (that is sensor and heater) is manufactured directly in the circuit board surface using a CAD/CAM equipment. This architecture allows a high dimensional accuracy of the sensor/actuator with a minimum track thickness, i.e., around 100 μm. In the cylindrical cavity, the transducer is manufactured using a copper wire. For this geometry, low aspect ratios were analyzed. Electronic response equations are derived and coupled to those governing the heat transfer phenomenon in cavities. After several tests, the model is compared to the experimental data. The obtained results seem to confirm the validity of the proposed idea, allowing an accurate temperature control in cavities with a self calibrating feature. At present time, we have obtained for both geometries a precision around of 0.01°C and an accuracy around of 0.1°C.
Sponsorship	Heat Transfer Division
Starting Page	677
Ending Page	682
Page Count	6
File Format	PDF
ISBN	0791842215
DOI	10.1115/IMECE2005-80038
e-ISBN	0791837696
Volume Number	Heat Transfer, Part A
Conference Proceedings	ASME 2005 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2005-11-05
Publisher Place	Orlando, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Actuators Transducers Inertia (mechanics) Stability Circuits Instrumentation Generators Computer-aided design Wire Geometry Cavities Heat Printed circuit boards Feedback Sensors Temperature control Copper Heat transfer
Content Type	Text
Resource Type	Article

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