Temperature Measurement As an Airflow Measurement Tool
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-04
Accurate measurement of airflow in a system card-on-board (COB) assembly is extremely difficult because of turbulence, frame and cable interferences, blower directionality, etc. Since conventional airflow measurement probes are reasonably large when compared to the space in most COB packages, there is a strong possibility of measurement errors. A calibrated card can be used to measure the effective airflow, i.e., the airflow that is actually cooling the modules. This would verify the airflow assumptions usually made earlier in the machine design process. Thermal chips are integrated circuits (ICs) that are a combination of resistors and diodes that can be calibrated such that any change in temperature produces a corresponding change in output.