Received: from hpoclrf.sj.hp.com by opus.hpl.hp.com with SMTP (1.37.109.8/15.5+ECS 3.3+HPL1.1) id AA20532; Wed, 28 Sep 1994 18:12:03 -0700 Return-Path: <kirk@hpmsd3.sj.hp.com-DeleteThis> Received: by hpmsd3.sj.hp.com (1.37.109.8/15.5+IOS 3.22) id AA29624; Wed, 28 Sep 1994 18:14:10 -0700 From: Kirk Lindstrom <kirk@hpmsd3.sj.hp.com-DeleteThis> Message-Id: <9409290114.AA29624@hpmsd3.sj.hp.com-DeleteThis> Subject: Re: Windsight forecasts stats (fwd) To: wind_talk@opus.hpl.hp.com-DeleteThis Date: Wed, 28 Sep 94 18:14:09 PDT In-Reply-To: <9409282159.AA02781@usc.com-DeleteThis>; from "Will Estes" at Sep 28, 94 3:34 pm Mailer: Elm [revision: 70.85]
The best alternative for a passive instrument that I read in that thread
was an optical device. You would have a bright white background, and a
dark black paddle spinning in front of it. The optical device would
then attempt to measure frequency changes of the measured light on the
background.
No, I don't think the device exists. Again, the hard part would be
getting Coast Guard permission to mount anything on their channel
marker.
-- Will Estes Internet: westes@usc.com-DeleteThis ============================== I remember Will's rec.windsurfing thread. The passive device used a "spinner" mounted on the buoy that one viewed with a telescope. Take the optical output from the telescope and let it hit a photodetector that was tuned to detect AC movement. The amplitude modulation would indicate the spin rate of the "spinner". It would be easy to design the electronics, the hard part is keeping the spinner spinning at a true rate with all the corrosion that would occur on the buoy.Kirk out Giving money to the Government is like giving whiskey and car keys to teenage boys. - P. J. O'Rourke +----------------------------------------------------------------------+ | Kirk Lindstrom - OCD Product R & D | Hewlett-Packard Co. M/S: 91UA | | Engineer/Scientist, Hardware | | |------------------------------------| Optical Communication Division | | kirk_lindstrom@sj.hp.com-DeleteThis | | | Kirk Lindstrom / HP0100/UX | 370 W. Trimble Rd. | | ph 408 435 6404 | fax 408 435 6286 | San Jose, CA 95131-1096 | +----------------------------------------------------------------------+
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