Please recommend a simple and unexpensive UV-VIS spectrometer to measure small absorption in transparent optical crystals with aperture ~5x5 mm and length 50 mm. We need to measure absorption as small as 2-5%.
Yes, millimeters. So we need in standard device for regular measurements of light absorption in the samples with optical aperture of 3-7 mm and the length of 30-50 mm.
Based on the specifications and your peculiar needs, I recommend you check out these products.
I believe they meet the requirements you described.
I hope that helps.
https://www.thermofisher.com/order/catalog/product/336028-000
https://www.agilent.com/en/product/molecular-spectroscopy/uv-vis-uv-vis-nir-spectroscopy/uv-vis-uv-vis-nir-supplies/cell-holders-bases-accessories-for-uv-vis-uv-vis-nir
https://www.perkinelmer.com/category/uv-vis-cell-holders-and-changers
https://www.mt.com/in/en/home/products/Laboratory_Analytics_Browse/uv-vis-spectrometers/uv-vis-accessories/Long_pathlength_cell_holder.html
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