Laser not Radar.... I could believe that a small low power laser flashes at the right frequency as the one in the police car might work. But you would have to use the same wavelength laser as is used in theirs. I really have no idea what that would be. Also Trying to evade a laser detector and driving above the speed limit is not too bright anyway. Always obey the rules of the road. From Steve Not all heroes wear tights and a cape. In theory, there is no difference between theory and practice, but in practice there is a great deal of difference. dberger@optonline.com ----- Original Message ----- From: "Olin Lathrop" To: Sent: Sunday, April 01, 2001 3:54 PM Subject: Re: [PIC]: Flashing a LED > > They used a flashing IR LED to confuse the LASER type speed guns. The add > > said the laser gun takes several readings per second of the object that > its > > pointed at and measures the difference for a mph. The IR LED flashing > > confuses the laser's computer and no speed registers at the gun display. > > > > Does anyone know anything about how this works? > > Would the IRLED have to flash at a particular freq, if so what? > > I not familiar with the exact design of radar speed guns, but I find it hard > to believe that pulsing IR of such low power would have any effect at all. > Radar uses microwaves which have wavelengths of several millimeters. IR > LEDs usually have wavelengths below 1 micrometer. There must be much more > IR power at longer wavelengths than that emitted by the hot radiator. > > Did they give any reason why a pulsing IR LED should confuse the radar gun? > > > ******************************************************************** > Olin Lathrop, embedded systems consultant in Littleton Massachusetts > (978) 742-9014, olin@embedinc.com, http://www.embedinc.com > > -- > http://www.piclist.com hint: To leave the PICList > mailto:piclist-unsubscribe-request@mitvma.mit.edu > > > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu