Newsgroups: sci.electronics
Path: utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: the laser speed measuring device
Message-ID: <1989Nov26.002133.3245@utzoo.uucp>
Organization: U of Toronto Zoology
References: <89325.164006BHB3@PSUVM.BITNET> <1840014@hpsad.HP.COM>
Date: Sun, 26 Nov 89 00:21:33 GMT

In article <1840014@hpsad.HP.COM> frankb@hpsad.HP.COM (Frank Ball) writes:
>I would think that if it was visable light or infared (most likely)
>that normal car headlights would jam it quite well.  They can't use
>very much power...

The laser gadget is almost certainly using a pulsed beam rather than a
continuous one, and picking pulses out of a continuous background is not
generally a difficult problem.  Car headlights don't even show the 120Hz
modulation of normal AC lighting, much less pulses short enough to confuse
something with nanosecond-range resolution.
-- 
That's not a joke, that's      |     Henry Spencer at U of Toronto Zoology
NASA.  -Nick Szabo             | uunet!attcan!utzoo!henry henry@zoo.toronto.edu


Brought to you by Super Global Mega Corp .com