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Hello SAA,
Last week or so I responded to a request from the thread : Subject: Towards a Cheap, Effective Light-Pollution Meter And as a result have continued to correspond with Steve Taylor in a collaboration that will attempt to produce a sky photometer. I have tested two sensors so far and conclude that a sky meter might be able to be built for under $100. The goal is for a $50 device that will measure V band and unfiltered sky. The unfiltered mode is useful as the detector has about the same response in the red / near infrared as a CCD camera. The final cost will depend on which detector and micro we use. The device will be battery powered, have a digital display, and a RS232 or USB port. We also will try to have limited logging so that at least 1000 date, time, and brightness values are stored. I have taken data with our prototype detector from my house in Tucson and have yet to take it to a site with a photometer for better calibration and so I can not say for sure what the limiting magnitude and resolution is. If, (a big if) and when we have a final design, we will seek away to make a limited production of these meters for evaluation. Our goal is to provide these at cost and in some cases give them to groups that are active in night sky issues. We are not made of money and will seek funding to do this from private sources. (Any one interested ??) The question to SAA is: How many of you are interested to buy the first and maybe the only generation of this device ? We will publish the design on Steve's web site so that the technically inclined can build their own. (http://www.astronomycentre.org.uk) Thanks for taking the time to read this. Clear Dark and Steady Dan McKenna Steward Observatory (this is not a U of A Steward Obs project) |
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