Motion monitor

Details Motion monitor Motion monitor

1976-06-24

1978-10-24

Michell, Robert W.

Communications: electrical

Selective

340 3E, 128DIG29, 128 2V, G01S 966

Patent

active

041224272

ABSTRACT:
A motion monitor particularly useful for monitoring infant respiration, and comprising an oscillator driving an ultra-sonic wave generator, a receiver for ultra-sonic echoes, a phase detector for detecting phase shift between the outputs of th detector and oscillator and means for recovering the respiration envelope from the output of the phase detector. In a preferred embodiment the system includes a phaselocked loop using selected very low frequencies in the output of the phase detector to control the oscillator frequency.

REFERENCES:
patent: 3550070 (1970-12-01), McLeod, Jr.
patent: 3631849 (1972-01-01), Norris
patent: 3681745 (1972-08-01), Perlmen et al.
patent: 3733581 (1973-05-01), Kalmus
patent: 3859984 (1975-01-01), Langley
patent: 3927662 (1975-12-01), Ziedonis
Wells, P. N., "A Range-Gated UTS Doppler System", Med & Biol. Engr., vol. 7, pp. 641-652, Sep. 1969.
Meire, H. B. et al., "Ultrasound Recording of Fetal Breathing"-Brit. Jrnl. Radiology V. 48 #570, pp. 477-480, Jun. 1975.
"TTL Cookbook"; Lancaster, Don; Howard Sams & Co., N.Y., 1976, pp. 128-135.

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