The objective of this work package is to further develop pyrometric temperature measurement methods suitable
for use on surfaces exposed to concentrated radiation as prevail in high-concentration solar facilities (e.g. solar
towers or solar furnaces) and arc lamp based solar simulators. Temperature is one of the key parameters in
the evaluation and understanding of the solar experiments. The ability to precisely measure this parameter on
samples exposed to concentrated solar radiation is an essential prerequisite for a successful operation of the
SFERA research infrastructure and is highly important for improving the quality of the facility’s service.


Task 1: Develop "Double Modulation" pyrometry for use in arc lamp based solar simulators (PSI)
This task aims to:
• Develop and implement power electronics that allow modulating lamp current/voltage (intensity) of high power
arc lamps.
• Design/build/implement hardware/software of detection system.
• Assess the method at PSI's high flux solar simulator (HFSS).

Task 2: Test "Double Modulation" pyrometry at solar furnace using the fast shutter (CNRS, PSI)
This task aims to:
• Experimental assessment of the performance of the method (CNRS, PSI).

Task 3: Assess ability of "Double Modulation" pyrometry to determine (relative) emissivity values at high
temperatures for specific cases (CNRS, PSI)
Pyrometric methods that do not rely on known emissivity values offer a distinct advantage as the emissivity
depends e.g. on temperature, morphology, and chemical composition of the sample. All of these properties
can change during the observation time and can hamper traditional pyrometry. Data obtained by "Double
Modulation" will be compared with values obtained by pyroreflectometry and more reliably from the direct
emissivity measurements as developed in the running SFERA project WP14 T2:
• Assess methodology on small (lab-scale) implementation (PSI).
• Assess methodology in solar simulator (PSI).
• Assess methodology in solar furnaces (CNRS, PSI).

Task 4: Camera based IR pyrometry aimed at CSP installations (CIEMAT, CNRS)
The following subtasks will be addressed:
• Develop and test a novel IR camera to perform temperature measurements in solar furnaces at various
wavelengths. As a by-product (not part of this project) the system will also be capable to deliver flux
measurements (CIEMAT).

Task 5: Active temperature regulation in solar furnaces (INESC-ID, CNRS ― continuation of SFERA 1 WP14)
High performance temperature control techniques have been developed during SFERA 1 in WP14, improvements
will be made to increase the versatility of the control to enhance its ease of use and to increase its cooling
control for better thermal cycling tests, notably for ageing tests applications of CSP materials. This task concerns
the improvement of the automatic temperature control system as follows:
• Implement a self-adapting mechanism for the control parameters of the temperature control system
• Implement an active sample cooling mechanism to allow for larger cooling rates.
• Adapt/enhance the system towards use with the MWSF furnace at CNRS Odeillo.