Measuring thermocouple time constants - A new method
Abstract
A new method of measuring the instantaneous time constant of flow phenomena by menas of a dual thermocouple system is described. The method is based on the cross power spectra and auto power spectra of two thermocouple signals coming from the same source. Using this approach, it is possible to calculate the ratio of the time constants over a wide range of physical conditions. It is shown that compensation for the thermal inertia of the thermocouples is a straightforward operation and makes it possible to calculate the real fluctuations in temperature. The method has been verified in measurements in a turbulent diffusion flame in the range from room temperature to adiabatic flame temperature. The results of the verification tests are described elsewhere.
- Publication:
-
Combustion Science and Technology
- Pub Date:
- 1986
- Bibcode:
- 1986CST....45..221C
- Keywords:
-
- Heat Transfer;
- Power Spectra;
- Temperature Gradients;
- Temperature Measurement;
- Thermocouples;
- Boundary Layers;
- Probability Density Functions;
- Temperature Measuring Instruments;
- Instrumentation and Photography