Coaxial Thermocouple MCT
High Frequency Measurements for Heat Flux Determination- Adaptable to Any Surface Shapes
This coaxial thermocouple was invented at the University of Aachen for measurements of high frequency surface temperature changes during hypersonic wind tunnel experiments with the European space shuttle Hermes.
From the surface temperature signal the convective heat flux is deduced. The probe has to be seen as a half infinite body. The sensor measures the model surface temperature change. With the knowledge of the wall material the heat flux can be calculated (s. publications).
The probe is small enough for mounting in the wing tip and can be shaped adapted to the surface by grinding. The metallic dust gives the contact between the two metals. Alternatively the conjunction can be reached by a vacuum disposition of a metal coating, but with the disadvantage of a fixed geometry.
The application of this thermocouple is not only limited to wind tunnel investigations, it can be used for all cases where fast surface temperature measurements are required. With its fast response time (only some µs) its custom designed surface and small dimension it can be used in engines, jet turbine engines etc. without disturbance of the stream. This coaxial thermocouple has demonstrated its reliability and durability in multiple experiments in Germany and worldwide.
In cases of very high temperatures the particles will oxidise and lead to signal loss. A new grinding with sand paper renovates the probe for nearly unlimited lifetime. Durability without renovation: 35 min at 615°C and 8 min. by 715°C.
Dr. Müller Instruments
Tel.: +49 - 6172 - 380 37 27
Fax: +49 - 6172 - 177 077 4
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