Meaning
Temperature sensor utilizes a central wire surrounded by a concentric tube to achieve rapid response times during transient thermal events. This specific sensor, the coaxial thermocouple, is utilized in high-enthalpy wind tunnels and combustion chambers to measure rapid surface temperature rises. Thin junctions at the sensor face enable microsecond-range response times.
Measurement Precision
High-frequency data capture is essential for calculating transient heat flux values. This measurement precision of coaxial thermocouple instrumentation allows the detection of shock impingements and turbulent bursts. Small sensor dimensions minimize flow disturbance on the test model.
Supply Chain
Aerospace test laboratories purchase these specialized sensors from a limited number of precision manufacturers. The supply chain of coaxial thermocouple procurement involves custom length and sheath material specifications to match model geometry. Delivery times often exceed several months due to the specialized micro-welding processes required.
To secure timely deliveries for wind tunnel campaigns, procurement teams must place orders well in advance of the planned test schedule.
Calibration Frequency
Extreme thermal shock degrades the sensor junctions after a limited number of high-enthalpy runs. The calibration frequency of coaxial thermocouple arrays is defined in the lab quality manual. Regular testing ensures that voltage output continues to correspond accurately to temperature changes.
