Subject:  (Curry) Re (High) infrared detectors (fwd)
Date:     Sat, 6 Feb 1999 024056 -0600 (CST)
From:     "Roy L. Beavers" <rbeavers@llion.org>
To:       emfguru <rbeavers@llion.org>
--------------------------------------------------


---------- Forwarded message ----------
Date: Fri, 05 Feb 1999 18:29:18 -0700
From: "Bill P. Curry" 
To: "Roy L. Beavers" 
Subject: Re: (High) infrared detectors (fwd)

Ingrid, 
	I don't think you need have any significant concerns.  Infrared radiation is
radiation adjacent (on the low frequency end) to the visible band of
requencies.  Visible frequencies cover the range of colors from violet to red,
having a wavelength (speed of light divided by frequency) range of around 0.4
micron to 0.7 micron.  (1 micron is one millionth of a meter.)  Infrared light
is invisible to the naked eye and typically has wavelengths from about 0.8
micron to several hundred microns.  In contrast, microwave radiation at 1 Ghz
frequency has a wavelength of about 30 centimeters.  Thus, infrared radiation
is nowhere near the microwave radiation frequency range or wavelength range. 
Its absorption in tissue is entirely different from absorption of microwaves. 
In fact, an infrared source emitting over a broad frequency band is just a
heat source.  If you use a heat lamp, you know to avoid overexposure when you
feel too hot.  I think you can use the same precautions in regard to the
infrared beams associated with your motion detector.  They are very low power,
and I seriously doubt that they can harm you.
-- 
----
Bill P. Curry, Ph.D.          |Physics is fun.
EMSciTek Consulting Co.       |Trying to make a living!
22W101 McCarron Road,         |Phone: (630) 858-9377
Glen Ellyn, IL 60137          |Fax: same, but require prior notice

	Home page:  	http://www.EMSciTek.com
         ____________________________________________________
        | Analysis, experiment design & software development |
        |        for engineering and the physical sciences   |
         ----------------------------------------------------



Archive provided courtesy of WaveGuide, http://www.wave-guide.org
Reprinted with permission of Roy Beavers, http://www.feb.se/EMF-L/EMF-L.html