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Explosive Testing
Coaxial Thermocouple MCT
High Frequency Measurements for Heat Flux Determination- Adaptable to Any Surface Shapes

Typical Applications
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.

MCT 19 and MCT 36
MCTB 48 with coaxial bore hole for
pressure transducer M60-1

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.

MCT 19 wall mount with glue
Fast sensor respond in water

Technical Data
Type of thermocouple:Type
Material:Chromel - Constantan, coaxial
Temperature range:- 200 to 900 °C
Smallest temp. change:0.5 K
Heat flux:20 KW/m² to 20 MW/m²
Response time:3 µs
p c k About 9500 W √s /m²K
Diameter:1.9, 3.6 and 4.8 mm
Size:MCT 19: Ø 1.9 x 26 mm
MCT 36: Ø 3.6 mm x 17 mm
MCTB 48: Ø 4.8 x 25 mm
Sensor MCT 19, 36 and 48 can be shortened in the area of their diameter 1.9, 3.6 and 4.8 mm.
Sensitivity:About 63 µV/K, (s. IEC-584 T1)
Calibration:Calibrated by the University of Aachen
Tip:Can be individually shaped by the user.
Specials:For the thermocouple with an outer diameter of 4.8 mm a coaxial bore hole with d=0.8 mm for connecting a pressure probe with a diameter of 1.9 mm is possible (e.g. Kulite XCQ-080 or Müller M60-1).
Connection:Via 2 m temperature resistance coaxial cable with BNC pos.
On request we also provide the sensor with 10 cm coaxial cable, connector and 2 m extension cable.
Amplification:Amplifier is needed. We recommend our MFA 1000
Ordering information
Article-No. 100-001-1: MCT 19, diameter 1.9 mm
Article-No. 100-001-2:MCT 36, diameter. 3.6 mm
Article-No. 100-001-3:MCTB 48, diameter 4.8 mm with coaxial bore hole for pressure probe connection.
Bore hole fits for sensor M60-1 with thread (100-201-2).
Article-No. 100-001-4:Surcharge for metallic surface
Article-No. 100-001-5:Surcharge for a short 10 cm cable plus connection to a 2 m extension cable with BNC pos.

MCT 19 and MCT 36
MCTB 48 with coaxial bore hole for pressure transducer M60-1
MCT 19 wall mount with glue
Fast sensor respond in water

Hans-Jürgen Fahl
The Validation of the Explosive Fumes Dynamics in Rooms – NTREM 2009
Olivier H., Grönig H.
Instrumentation Shock Wave Tunnel - ICIASF 1995
Dr. Müller Instruments
Hasengarten 35
61440 Oberursel

Tel.: +49 - 6172 - 380 37 27
Fax: +49 - 6172 - 177 077 4
Mobil: +49 - 171 - 431 9060