Phonoptics fiber optic sensors can be used in a multitude of application cases such as:
-Engine combustion study
-Sound analysis of "crack" in oven, autoclave or any hostile environment
-Aerodynamic analysis in turbine input or output
-Non-destructuctive testing with ultrasonic emission and analysis by our sensor
-Gas leak detection in ATEX environment
-Analysis of electrical or magnetic phenomenon
Measurement on graphite
Graphite is a priori a good black body
Measurement on aluminum
Shiny aluminum is a complicated material to measure, but within the reach of the ThermoRef. For this, it is necessary to tilt and correctly adjust the parameters of the ThermoRef, then the measurements are possible from 500°C.
We find here that the bichromatic temperature is not reliable.
Regarding the measurements before the curves of T and Thermocouple meet, the difference is explained by the fact that the thermocouple does not have good contact with the aluminium. This can be seen with the great variability of its measurements.
Once the temperature of 580°C has been reached, the thermocouple penetrates inside the aluminum being melted, which ensures perfect contact and therefore a good temperature reading.
Measurement on molten aluminum
this time, in a carbon crucible, a significant amount of aluminum was added to obtain a viscous molten aluminum paste. An oxide layer forms on the surface. The setpoint temperature of the crucible is high: 900°C but the surface temperature is much lower, as shown by the measurements with the thermocouple and with the ThermoRef.
Measurement on 316L stainless steel
stainless steel is also a complex material to measure because it is shiny at first, then with layers of oxides that vary over time. This is the ideal use case for the ThermoRef.
Measurement on ceramics
The ceramic, ocher or white, was placed at the bottom of the graphite crucible to be heated.
In the visible, white in color, we expect a body with a low emissivity but in reality in the infrared, it is a body with rather high emissivity. The measurements were therefore quite easy.