Before I used flowmeter of plan type manufactured by cptec in lille.
Now i dont know what are the latest invention in this field
One question. What du you mean by thermal flowmeters? Thermal flowmeter (flow metrer that mesure flow using thernal method) or heat fluxmeter (to measure heat flux). Captec produces the second type. As for the method of measurement (contact, using the Fourier law) is as far as I know, they are not invented anything better. It is important to precision measurement of the temperature difference, the greater it is, the less the uncertainty of the temperature measurement. Another important factor is the thermal conductivity sensor. It should be constant throughout the measuring range of the sensor. Smaller uncertainties generally have sensors with smaller measuring ranges of temperature.
By thermal flowmeter I mean a sensor who mesure heat flux.
About, Captec their sensor is based on the following phenomena:
14 The thermoelectric properties of electrical conductors in the form of sheets and covered with an electrolytic deposit of different nature are due to the induced currents passing across the surface separating the conductors. These currents are proportional to the instant value of the calorific fluxes located in the electrolyticdeposit. The electric voltages measured in the superposed conductors are representative of the heat transfers andmost specially of the spatial average of the heat fluxes. The obtained results have been used to bring a new solution to the problem of measuring calorifical fluxes. see this papre on : https://hal.archives-ouvertes.fr/jpa-00244784/document.
Sensor from Captec operates on a different principle than I wrote.
Below some link to information (review) about various method of heat flux measurement.
In the book: Practical Temperature Measurement, from page 329:...Heat Flux measurement Techniques:
https://books.google.pl/books?id=73Km1TpL2mkC&printsec=frontcover&hl=pl#v=onepage&q&f=false
Today most popular are senesors with thermocouples stack.
One of the newest method used sebeck efect:
http://www.greenteg.com/heat-flux-sensor/seebeck-sensor/
In these sensors output signal is the voltage, and the uncertainty of measurement of heat flow is approximately 5%..
https://www.sciencedirect.com/science/article/pii/B9780128008843000162
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