| Summary: | 碩士 === 國立成功大學 === 電機工程研究所 === 84 === The purpose of this study is to construct an ultrasonic system
for detecting the motion activities of newborn infant that will
be identified as infant's breathing rate, tremor, and the other
important behaviors. Three ultrasonic measurement methods, the
phase difference method, the pulse-echo method and the self-
compensation technique, are adopted in this research. The phase
difference method is used to measure the relative displacement
of every measured point on the body of newborn infant for
identifying the kinds and quantities of his behaviors. The
pulse-echo method is adopted to measure the absolute distance
between the transducers and the infant's body for detecting the
error arising from the improper position of measurement. A self-
compensation technique based on the measurement of a known
distance is used to measure the sound velocity for compensating
the error arising from the environment-induced sound velocity
variation. A hardwired control unit is also implemented to meet
the need of the high operation speed of a high performance
measurement system. Besides, a simple but powerful cascade
method is adopted to expand the system to monitor several baby
containers easily.
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