Meaning
Fast-response thermal sensor utilizes a micro-thin metal deposit on an insulating substrate to measure localized heat transfer rates. This instrument, the thin film heat flux gauge, is used in shock tunnels and gas turbines to capture transient thermal events. The low thermal mass of the sensor layer enables microsecond response times.
Measurement Speed
Highly transient thermal loads are captured with high temporal resolution during brief tunnel runs. This measurement speed of thin film heat flux gauge instrumentation is required to resolve shock wave impingements and turbulent transition boundaries. Small sensor dimensions allow dense arrays on test models.
Sensor Integrity
High-speed particulate impacts in the flow can erode the thin metal layer and ruin the sensor. The sensor integrity of thin film heat flux gauge arrays must be verified before and after each test run. Damaged gauges are replaced or recalibrated to maintain data quality.
Acquisition Cost
Manufacturing these sensors requires microfabrication equipment and specialized materials. The acquisition cost of thin film heat flux gauge arrays represents a significant part of the instrumentation budget for aerodynamic testing. Labs often produce these sensors in-house or purchase them from specialized vendors.
To control these expenses, test facilities establish blanket purchase orders with micro-fabrication laboratories, ensuring a steady supply of replacement sensors at discounted bulk rates while maintaining the required quality standards.
