Coaxial Thermocouples

  Substrate of thin film heat transfer gauge with evaporated metal film Copyright: © HGD Substrate of thin film heat transfer gauge with evaporated metal film

Thin Film Gauges for Fast Heat Transfer Measurement

Thin film heat transfer gauges are small heat flux probes with a high sensitivity and a short response time of about 1 μs as they are used for fast heat transfer measurement. These probes have been developed at the Shock Wave Laboratory and are designed for the measurement of highly transient, low heat fluxes.

Typical design of thin film heat transfer gauges

The thin film heat transfer gauge consists of a ceramic substrate on which a thin nickel or platinum film is deposited by means of sputtering. On the thin metal film protective layers may be evaporated for insulating and shielding purposes.

 

Fast heat flux measurement

During the experiment the thin film is supplied with a constant current. The heating of the film causes a resistance change which leads to an increase of the voltage. This change of voltage can be measured directly.

 

Dimensions

Diameter: 2.3 mm
Length: 4 mm

Material

Substrate: Al2O3, ZnO2
Metal film: nickel, platinum, zinc