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The
wave length of the rays is classified as infrared
rays, visible rays,
ultraviolet rays and X-rays in order from the
longest. Ultraviolet rays are utilized
mainly to the dermatological treatment as its
length too long to penetrate into
the skin. As a kind of wave energy, the frequency
ranges of infrared rays
in 0.76~1.5 microns are called near infrared rays,
1.5~5.6 micron rays are
medium infrared rays and 5.6~1.000 microns far
infrared rays. A German
physicist(The Nobel Prize Winner) proved that
infrared rays with the frequency
ranges between 6~14 micron are effective to ionized
heat treatment.
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