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Dr. Paul's solar prominence filter????
Does anyone know what happend to Dr. Henry Paul's solar prominence
filter as described in the ATM series of books, Book Three, I think. It was made of a stack of quartz plates of various thicknesses. I wonder how this type of device compares to modern day interference filters? I believe this was called a Lyot Quartz Monochromator. |
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Dr. Paul's solar prominence filter????
Ed Majden posted:
Does anyone know what happend to Dr. Henry Paul's solar prominence filter as described in the ATM series of books, Book Three, I think. I don't know what happened to the unit he built, but there were undoubtedly others. It was made of a stack of quartz plates of various thicknesses. I wonder how this type of device compares to modern day interference filters? I believe this was called a Lyot Quartz Monochromator. They can be as broad or also as narrow as the Fabry-Perot Etalon-based filters used today. It depends on the number of elements you want to put in (the more elements, the narrower the passband generally is). It is a somewhat more complex design than the F-P filters, but if you can get access to the quality quartz (not an easy task BTW), as well as the interspaced polarizers, you could make one yourself. Clear skies to you. -- David W. Knisely Prairie Astronomy Club: http://www.prairieastronomyclub.org Hyde Memorial Observatory: http://www.hydeobservatory.info/ ********************************************** * Attend the 11th Annual NEBRASKA STAR PARTY * * July 18-23, 2004, Merritt Reservoir * * http://www.NebraskaStarParty.org * ********************************************** |
#3
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Dr. Paul's solar prominence filter????
Ed Majden posted:
Does anyone know what happend to Dr. Henry Paul's solar prominence filter as described in the ATM series of books, Book Three, I think. I don't know what happened to the unit he built, but there were undoubtedly others. It was made of a stack of quartz plates of various thicknesses. I wonder how this type of device compares to modern day interference filters? I believe this was called a Lyot Quartz Monochromator. They can be as broad or also as narrow as the Fabry-Perot Etalon-based filters used today. It depends on the number of elements you want to put in (the more elements, the narrower the passband generally is). It is a somewhat more complex design than the F-P filters, but if you can get access to the quality quartz (not an easy task BTW), as well as the interspaced polarizers, you could make one yourself. Clear skies to you. -- David W. Knisely Prairie Astronomy Club: http://www.prairieastronomyclub.org Hyde Memorial Observatory: http://www.hydeobservatory.info/ ********************************************** * Attend the 11th Annual NEBRASKA STAR PARTY * * July 18-23, 2004, Merritt Reservoir * * http://www.NebraskaStarParty.org * ********************************************** |
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