Andy Resnick's latest activity
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Andy Resnick replied to the thread Undergrad Can somebody explain this: Planck's Law in action.Interesting question- one I had not thought of. First, confined plasmas have a variety of radiation emission mechanisms, not just... -
Andy Resnick replied to the thread The Secrets of Prof. Verschure's Rosetta Stones.Carbonatite, Fen Complex. This sample has a significant amount of apatite, generally arranged either in aggregations of elongated...
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Andy Resnick replied to the thread Undergrad Why use Stefan's Law to measure temperature?.Well.... if you know the emissivity, then I would agree that a commercial IR detector/camera can hit that 5% accuracy. The problem is...
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Here is a smaller piece of geology:
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Impact crater in Germany Width: 20-24 km Area: 350 sqkm Depth: 100-150 m Date: -15 million years Remark: has an inner wall Asteroid...
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Morro Bay This is the core of a volcano and an easy climb to top.
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Columnar basalt. This is the Giant's Causeway in Ireland, and is not a photo I took. I did take photos of columnar basalt in Iceland...
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Add more cool geology pictures if you have them.
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Andy Resnick replied to the thread Undergrad Why use Stefan's Law to measure temperature?.But that's sort of my point- without any 'ground truth' data, it's not possible to accurately determine the temperature of an unknown...
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Andy Resnick replied to the thread Undergrad Why use Stefan's Law to measure temperature?.I'm not entirely sure what you mean- for example, MWIR (3-5 micron band) is well suited for imaging 'hot' internal combustion engines...
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Speaking of ultra-fast lenses I just want to mention that I have one, and it was quite cheap for being such a fast lens: 7Artisans 35mm...
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Andy Resnick replied to the thread Undergrad Why use Stefan's Law to measure temperature?.I think the problem is more difficult than that- the emissivity can vary wildly over the relevant waveband (especially either MWIR or...
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Andy Resnick replied to the thread The Secrets of Prof. Verschure's Rosetta Stones.Carbonatite, from the Fen complex. This sample has a significant amount of apatite, generally arranged in radiating aggregations of...
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Andy Resnick replied to the thread What did you do with your old college textbooks?.I still have most/all of my college texts because I still (occasionally) consult them. To be sure, I consult them to reflect on how I...
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Andy Resnick replied to the thread Random Photos.Jealous = me! This is one of the lenses I'd like to play with, for sure. It seems we are in a 'new golden era' of lens design, with...
