부산대학교 도서관

Elderly people are increasing every year, and the demand for nursing care is also increasing. There is urination problem of elderly person in the care spot. The reason is that it is difficult to express intention, and the time that the patient can endure after urinating due to aging muscle weakness is short. To solve this problem, I thought it was necessary to measure urine volume in the bladder. In this study, we measure urine volume in the bladder from the change in phase when radio waves pass through water. In this paper, we measure the phase change when a radio wave transmitted from a moving antenna passes through a plastic bottle filled with water using a phase detection circuit, and show the results and discussion.