Apparatus and methods for remote detection of physiological changes
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United States of America Patent
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Feb 19, 2013
Grant Date -
Dec 23, 2010
app pub date -
Jun 17, 2010
filing date -
Jun 18, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus for sensing motion having a transmitter for transmitting a carrier signal; a frequency control connected to the transmitter for controlling the frequency of the carrier signal; a first receiver for receiving the reflected transmitted carrier signal; a second receiver for receiving the reflected transmitted carrier signal, the second receiver being placed out of phase by less than a wavelength of the carrier signal from the first receiver; means for subtracting the carrier signal received by the second receiver from the carrier signal received by the first receiver to produce an error signal; wherein when motion is sensed by the apparatus, the error signal moves from zero thereby causing a corrective signal to be generated and sent to the frequency control, the frequency control forcing the error signal to zero.
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