🚀 go-pugleaf

dag@col.hp.com (David Geiser) writes:

>> sees at least ond diode.  Modulate the power supply with a little noise (like
>> ignition noise) and the officer won't be able to get a reading that makes any 
>> sense to his machine.

>On second thought, it's fairly easy to descriminate the
>reflections.  In fact, it's probably really necessary given all
>the regular IR stuff out there like your fan blade chopping the
>engine heat, vibrations of the car body due to resonance or 500W
>woofers, etc.

Perhaps it may be easier than you think. All we'll need is the expected 
modulating frequency of the laser and then send back a much more intense
bandswept signal to drown out the reflection. Sorta like trying to 
stargaze during the noonday sun. Does anyone really have the hard spec's on
the wavelength involved and what IR leds would come close to that spec?

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