Communications: electrical – Digital comparator systems
Patent
1976-02-20
1978-05-16
Habecker, Thomas B.
Communications: electrical
Digital comparator systems
340207R, G08C 1912
Patent
active
040901769
ABSTRACT:
Signals from a high frequency transmitter outside of the biological object are received in a resonant receiving circuit inside the object whose resonant frequency corresponds to the value of the parameter being measured. The signal from the resonant receiving circuit is applied to the input of a frequency multiplier whose output is connected to a second resonant circuit tuned to the multiplied frequency. The second resonant circuit transmits a return signal to a receiver outside of the biological object which is also tuned to the higher frequency. The signal at the receiver will have a maximum amplitude when the transmitter frequency is equal to the frequency of the first resonant circuit as tuned by the value of the parameter. The adjustment of the transmitter frequency required for receiving maximum energy at the receiver is a measure of the value of the parameter in a first embodiment. An alternate embodiment, the frequency of the transmitter is wobbled by means of a sawtooth voltage generator, the time difference between the sawtooth flyback and the maximum amplitude of the signal at the receiver constituting a measure of the value of the parameter.
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patent: 3656132 (1972-04-01), Brumbelow
patent: 3713124 (1973-01-01), Durland
Habecker Thomas B.
Kelman Kurt
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