Brookhaven National Laboratory
Running Debian, because if it's good enough for the International Space Station it's good enough for me.
When supressing stray light there is such a thing as too many baffles. Baffle edges “glint” however thin they may be and without rigorous analysis one wonders if baffles are doing more harm than good.
In the case of an optical tunnel optimized for flat field illumination there should be as few exposed baffles as possible and I make the case that a single well placed primary baffle is optimally effective. more
A concept for actuating individual CCDs in tip/tilt/piston for integration into an active optics control loop. Dummy CCD is shown. more
Setting up Openpilot on an NVIDIA Jetson for affordable and extensible autonomous driving.
Link to Youtube Channel
It's a two-channel controller for fine-positioning (arbtirarily low speed, bi-directional control) of brushless motors. It's open source, but it's also my second product through Sky's Edge.
A truly usable rotary-dial cellphone to replace my flip phone (I don't use a smart phone). This is a statement against a world of touchscreens, hyperconnectivity, and complacency with big brother watchdogs.
Originally used a PICAXE-based controller with the factory motor kit (more) to steer a heliostat for a spectroheliograph at the solar (not sidereal) rate.
Subsequently built a faster drive system with NEMA stepper motors and an Aruino-based controller for an tracking antenna base station for long range drone and balloon flights. Most recently used as a mount for a small radio telescope. more
Homebrew multicopter drones seem to become ratsnests of tape, velcro, and cable ties as components are added and removed. This is a 3D printed airframe with an accessory cage / tower structure built onto the hub. The tower, comprised of four 3mm diameter carbon fiber tubes, carry 3D printed stages to which various electronics can be attached. The modular and extensible nature of the accessory tower allow complete freedom of reconfirgurability for tinkering and development. The original PED drone was lost somewhere in Southold, NY in 2013. A new and improved version is nearly complete which I'll put it on the Thingiverse some day. original diydrones.com blog post
After sanding, Hatchbox Wood PLA is so wood-like that if you tell people it's 3D printed they wont believe you. more
A Gregorian with a sub-aperture corrector for diffraction limited imaging across a .5 degree field of view and 25mm fully illuminated field. Original optical design. This has become a long term back burner project. The OTA mechanical assembly is built but I still need to have the optics made. more
Cut open a Jansjo LED light from IKEA and glue it to the film pressure plate on your old SLR instead of throwing it in the garbage. more
Note: I find the death of film tragic, both for still photography and at the theater.
Message in a bottle: If anyone has a retired 35mm movie projector (w/ platter system or not) they want taken off their hands please contact me.
CSoftware and hardware development to do radio imaging with a single dish. This is a work in progress that will become the basis for a larger (hopefully open source) effort at the Custer Institute's radio observatory (above). This incarnation uses a HackRFOne oftware defined radio, a 3D printed patch antenna feed, a ~1m spun aluminum dish (courtesy Tom Feireabend), and modified Celestron CG4 telescope mount (above): more