Remote Sensing of Body Signs and Signatures
Abstract
This report describes the development of a microprocessor-based remote sensing system for noncontact detection of heart rate and respiration. Low power sinusoidal microwave signal at a frequency of 10.525 GHz is generated by a Gunn diode oscillator in an integrated Doppler transceiver. A standard gain horn is used to direct the microwave energy to the chest of a subject at a distance of a few centimeters. Since movements associated with the contraction of the heart and expansion of the lungs are translated into motions of the chest wall, the Doppler microwace reflected from the chest is processed to yield information on the frequency and regularity of these cardiopulmonary events. The microprocessor-based battery-powered system is designed to provide continuous operation for approximately one hour. It allows selection of heart rate or respiration to be displayed on a 3-digit LCD. An analog output jack is provided for oscilloscope display or chart recording. The design range of heart rates is from 40 to 200 beats per minute and that for respiration is from 3 to 30 breaths per minute. The signal acquisition times for heart rate and respiration determinations are 12 and 48 seconds. respectively. Keywords include: Doppler Microwaves, Remote Sensing, Noncontact Measurement, Heart Rate, Respiration, Microprocessor-Based, Computer Algorithm, and Pattern Analysis.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1985
- Accession Number
- ADA162106
Entities
People
- James C. Lin
- Karen H. Chan
Organizations
- University of Illinois at Chicago