Pyrometric temperature measurements in solar furnaces

Surface temperatures are key parameters in many applications of concentrate d solar radiation. Pyrometric temperature determination is. however, hamper ed by reflected solar radiation. Two approaches resolve this problem were e xperimentally tested on a solar reactor at the Paul Scherrer Institute (PSI ): the flash assisted multi-wavelength pyrometry (FAMP) developed as PSI an d a solar-blind pyrometer developed by the IMPAC Electronic GmbH in Frankfu rt, Germany, in collaboration with PSI. Performance, advantages, and disadv antages of the two pyrometers are reported and discussed.