Dear All,
I am interested to measure optical properties of a material including solar absorptance, solar reflectance, etc at different high temperatures (from 200°C to 1200° C). In general, VICTOR Multilabel Plate Reader or Shimadzu UV-1800 spectrophotometer can be used for such measurements. As far I know, a sample can be tested up to 50°C or slightly above using these equipment. How can I measure these properties with a good accuracy at higher temperatures.
Thanks in advance to the respondents of this query.
Dear Yasir, welcome
To measure the optical performance of materials at such high temperature you can use a vacuum chamber in Quartz glass to enclose the specimen. The heating is accomplished indirectly by power LASER beam. After heating one can measure the optical performance of the specimen by Fiber optic spectrometer.
For the complete apparatus please follow the links:
https://hal-amu.archives-ouvertes.fr/hal-01690700/document
and http://www.jhuapl.edu/techdigest/views/pdfs/V13_N3_1992/V13_N3_1992_Sova.pdf
Best wishes
Dear Dr. Yasir:
Laser technology is certainly a good solution through a quartz window of a vacuum chamber, but it is monochromatic and also limited to certain discrete emission wavelengths from UV, VIS and IR.
Large core high temperature optical fibers may be used to both guide true solar radiation (or that from a solar simulator) to your sample, and also to collect reflected solar radiation from the sample, as described by the following text from the product description as attached.
"We now offer single-mode and multimode mode fibers with high temperature aluminum or copper alloy coatings. Thin layer of metal provides mechanical strength and eliminates outgassing, at the same time increasing temperature range and heat conductivity of the fiber. Surprisingly cost-effective compared to their gold-coated counterparts, the fibers can withstand temperatures up to 600° C or even higher, depending on heating pattern and atmosphere composition"
Best Regards
Dawei Liang
Head of solar-pumped laser laboratory, New University of Lisbon
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