![]() Orion 10x50 UltraView Wide-Angle Binocular Whether you're new to the game and interested in practicing serious binocular astronomy or just want a casual cosmic close-up on a working night, these "twin telescopes" are both convenient (portable) and affordable. A good pair of binoculars can be the difference between five or ten minutes of sweet stellar insights, and none at all. Sure, it's exciting to travel to a remote locale with sophisticated equipment, but a satisfying experience doesn't have to mean entire nights spent alienated from your family or totally missing out on television. Now what? Maybe it's time to get back to the basics, and challenge your optical explorations with a good pair of backyard binoculars.Īstronomy is most enjoyable when it is a relaxed experience. You've logged time under genuinely dark skies and paid your dues chasing down some of the most difficult and distant deep space objects that have ever graced a star chart. Maybe you've observed through almost every size imaginable and your optics fleet contains everything just short of the Hubble. 32, 4199 (1993).Perhaps you've had a telescope for many years now. dissertation, Loughborough University of Technology, 1995. F 801-96, Standard Test Method for Measuring Optical Angular Deviation of Transparent Parts, February 1981(Reapproved 2008). ![]() Google ScholarĪmerican Society for Testing and Materials ASTM. F 2469-05, Standard Test Method for Measuring Optical Angular Deviation of Transparent Parts using the Double-Exposure Method, March 2005.Īmerican Society for Testing and Materials ASTM.F 1181-96, Standard Test Method for Measuring Binocular Disparity in Transparent Parts (Reapproved 2003). , Google Scholar CrossrefĪmerican Society for Testing and Materials ASTM. Goodyear, “ Helmet-and head-mounted displays IV,” Proc. 156 (Neuilly sur Seine, France, 1988), pp. Goodyear, ASC-99-0360, Air Force Research Laboratory, February 22, 1999. The developed instrument is handy to use and computes both angular and binocular deviation with an accuracy of less than ☐.1 mrad (≈0.036 mrad) and has an excellent repeatability with an error of less than 2%. Accurate quantification of the shift in the pattern is obtained by cross-correlating the reference shadow pattern with the specimen shadow pattern and measuring the location of the correlation peak. It measures the deviation in the geometrical shadow cast by a periodic dot pattern trans-illuminated by the distorted light beam from the transparent test specimen compared to the reference pattern. This instrument is especially useful in the qualification of aircraft windscreens and canopies. In this work, we have developed an instrument to measure both the angular and binocular deviations introduced by transparent sheets. ![]() The angular and binocular deviations introduced are particularly important in the context of aircraft windscreens and canopies as they can interfere with decision making of pilots especially while landing, leading to accidents. This distortion is measured in terms of angular and binocular deviation of an object viewed through the transparent sheet. Objects viewed through transparent sheets with residual non-parallelism and irregularity appear shifted and distorted.
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