David Mason demonstrates a couple inventions

[@websitebuilder09]

Amazing display.

[@tomking2030]

Just incredible. I'm a big skywatcher but its not all about cameras. Different sensors, different ways of thinking like David has done so far outside of the box. This is the way. I'd like to know how to add gear like this to my UFO watching tool box and expand upon your genius.

[@davidmason5755]

Thanks, Tom! I'm glad you're setting up equipment for skywatching. The phenomenon is real and there needs to be more research using equipment and data collection. Too many are making mountains out of molehills by talking about old UFO stories. The only way to discover anything new is to collect data.

[@robynk6702]

You're a pioneer, sir!! 🤘

[@reynal_omnicide9217]

That music was looking pretty good @2:42

[@Vitotesta]

Amazing

[@thenightvisionlab]

Hello David, Again, a great achievement illustrating your inventiveness! Impressive! Perhaps two questions: (1) When you are observing a luminous phenomenon, does the sky background may not bring some background noise being detrimential to the S/N of your observation? I mean (sorry, English is not my native tongue...), with, as you mentioned, atmospheric turbulences, but also artificial light pollution reflected or diffused by the atmosphere (with all of the public led lightning, (pulsing) NIR sources, variable light from traffic, but also air-glow (in combination with the turbulences, and so on....), is not sometimes difficult to catch a modulation of a weak observed light above this quite annoying noise ? In this sense, would it be easily doable to set in your system a kind of embedded signal treatment, usable on the field, by performing noise subtraction in real time ? Perhaps with using a second photodiode aiming an other part of the sky, and using a differential setting, or whatever would be suitable in this sense ? (2) Would it be interesting, to your opinion, to add a filtering system (why not a filter wheel) in front of your binocular, for getting at least partly rid of the light pollution or being able to quickly scan different spectral band during your observation (on anecdotal remark: filter like IR pass allows to obtain nice results for long distance because atmosphere is less diffusive for longer wavelength, as you know). On one hand, losing a part of the spectrum by using filter may be pity, but on the other hand, with a filter wheel quickly manipulated, it may be interesting to obtain different resulting demodulated sound by your system from such selected upstream optical filtering. Just some thoughts (i guess you already considered all of it), hoping i am not mistaking myself by missing something. Again thank you for sharing your work with us! Best regards.

[@davidmason5755]

I have experimented with offsetting photodiodes to offer 180 degree phase cancellation in an attempt to reduce noise. It works only under ideal situations with about -6dB null performance. I also experimented with high Q notch filters of 50-60 Hz and 100-120 Hz to reduce street lighting noise. However, today many LED lamps are pulsed at various high frequencies that can't be filtered via electronic filtering, nor filtered optically with OIII, HA, HB, UHC, or pass band filters. It certainly complicates the game of astrophotography and filtering the broadband spectrum of light pollution. Thanks for your suggestions as they are on the right track for the ingoing need to combat light pollution especially with image intensifier night vision and astrophotography.

[@thenightvisionlab]

@@davidmason5755 , thank you for your feedback... Indeed, the light pollution, especially with the massive using of LEDs, is a plague for every sky observer.... The most efficient possibility which remains, unfortunately, is to hunt darker places for our practices..... One additional question, please, for my education: is the intrinsic thermal noise produced by the photodiode, sufficiently weak to be ignored, or in other words to be considered not disturbing, when you are aiming weak modulated light source ? Just a thought, for the fun.... It would be perhaps interesting also to do some basic spectroscopy, in order to see if an observed source is really monochromatic or not, and if not, to imagine a means, based on your concept, for checking if such poly-chromatic source would or would not have different modulations respectively distributed on some parts/wavelengths of its spectrum..... Anyway, again thank you for your work and sharing that with us. Best regards.

[@curiousgeorge7515]

@@davidmason5755 Hello, saw you on Cristina's show. You are just like me, I built a light receiver at age 15. According to spectrum's I took, light pollution is

[@ivanm.g.7442]

expert in cameras , video 240p

[@davidmason5755]

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