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Abstract
A method for measuring such physiological parameters as pulse rate and respiration without physically connecting electrodes or other sensors to the body. A beam of phased energy, for example microwaves, is directed toward the body of a person at a region thereon which undergoes physical displacement corresponding to variations in the parameter being measured. The phase relationship of the energy reflected from the body is compared with that of the transmitted energy to determine the extent of physical movement of the body region as affected by the parameter being measured. The present method may be used as an overt or covert lie detection technique.

Patent number: 4085740
Filing date: Mar 28, 1966
Issue date: Apr 25, 1978
Inventor: William P. Allen, Jr.
Assignee: Lockheed Corporation