Continuous-wave reflection transmissometer with target discrimination using modulated targets
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United States of America Patent
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Sep 6, 1994
Issued Date -
N/A
app pub date -
Apr 19, 1993
filing date -
Apr 23, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The attenuation of electromagnetic waves by a transmission medium is detected or measured by directing a continuous periodic electromagnetic wave toward a reflector. The reflector is modulated to modulate the electromagnetic wave as it is reflected. The reflected wave is received and an output signal related monotonically to the power of the modulated reflected wave is detected. The output signal is then compared to the output signal which is or would be obtained under various other transmission conditions.
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