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There are a number of possible ways to measure thermal conductivity, each of them suitable for a limited range of materials, depending on the thermal properties and the medium temperature. Three classes of methods exist to measure the thermal conductivity of a sample: steady-state, time-domain, and frequency-domain methods.
The thermal conductivity detector (TCD), also known as a katharometer, is a bulk property detector and a chemical specific detector commonly used in gas chromatography. [1] This detector senses changes in the thermal conductivity of the column eluent and compares it to a reference flow of carrier gas. Since most compounds have a thermal ...
The equipment is normally contained within a single unit for ease of transport and efficient use. [3] The thermal response data (i.e. temperature development in the borehole at a certain energy injection/extraction) allows estimation of the effective thermal conductivity of the ground and the thermal resistance of the borehole.
The transient hot wire method has advantage over the other thermal conductivity methods, since there is a fully developed theory and there is no calibration or single-point calibration. Furthermore, because of the very small measuring time (1 s) there is no convection present in the measurements and only the thermal conductivity of the fluid is ...
Portable instruments for the analysis of helium content of breathing gas mixtures may be based on a thermal conductivity sensor (katharometer). These sensors can be very stable and maintenance free and also highly reliable and accurate. [1] A typical thermal helium analyser comprises two chambers, each with an identical thermal conductivity sensor.
The higher the thermal diffusivity of the sample, the faster the energy reaches the backside. A laser flash apparatus (LFA) to measure thermal diffusivity over a broad temperature range, is shown on the right hand side. In a one-dimensional, adiabatic case the thermal diffusivity is calculated from this temperature rise as follows:
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