WiSi-Testpilot Posted October 7, 2018 Share Posted October 7, 2018 On the 6th of October we took some pictures from a solar plant. The images are size reduced and enhanced. Unfortunately I have a bright spot in the middle of the NIR pictures. I found, that the SELP1650 is poor for NIR. Unexpected and very interesting are the patterns in the UV image. However, the patterns do not correlate with the defects. In the NIR and full-spectrum images, the patterns are not visible. Full-Spectrum Sony A 6000, Lens SELP1650IR Filter: Green.L, IR950,UV Filter: Makario SP2 UV-400N Thermal image: Flir Vue 336 Full_Spectrum_DSC01570: 1/800s, f/6.3, ISO-100 NIR_DSC01520, 1/80s, f/6.3, ISO-1000 NIR_DSC01571, 1/60s, f/6.3, ISO-640, UV_DSC01543, 1/3s, f/6.3, ISO-3200 Best regards,Wilhelm Link to comment
Andy Perrin Posted October 7, 2018 Share Posted October 7, 2018 The patterns in the UV image are probably because the solar arrays have a strong angular dependency that is enhanced in UV (where refractive indexes tend to be higher). It is probably interference effects in the layers of the solar cells. Link to comment
BruceG Posted October 10, 2018 Share Posted October 10, 2018 Interesting comparison, your IR image has a slight hot spot in the centre, I find that lens with more elements tend to have worse hot spot issue, my UV lens with simple optical design also works well for IR above 900nm. Link to comment
WiSi-Testpilot Posted October 10, 2018 Author Share Posted October 10, 2018 Thank you for your replys. Today I took an image with a 760 nm Green.l filter (1/540s, f/4, ISO-100). It is almost without a hotspot. I will also order the Sony pancake lens SEL16F28, which contains only 5 elements. My current lens SELP1650 contains 9 elements. The pancake may be better above 900 nm and for UV too.Best regards,Wilhelm Link to comment
Andrea B. Posted October 10, 2018 Share Posted October 10, 2018 That is such an impressive solar array! Thanks for this interesting post.We hope to have some solar panels eventually for our new house. So it is interesting for me to see how this might be done. To add to Andy's comment, I was wondering if there might also be some condensation or humidity on the solar panels which might the mottled patterning in the UV photo. *** Wilhelm, as Editor I took the liberty of pairing your captions with the photos. When you are making the post, place the cursor where you want the photo to appear within the text and then click the "Add to Post" button next to the uploaded photo icon. (This is not required, of course. I'm just explaining it in case it was not obvious.) Link to comment
WiSi-Testpilot Posted October 13, 2018 Author Share Posted October 13, 2018 Andrea, thank you. The solar plant belongs to a friend of mine. Our house is too small for a solar array and the roof has no orientation to the south, see image (Green.L, IR950, 1/60s, f/3.5, ISO-160).Best regards,Wilhelm Link to comment
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