A Highly Reliable Ultrasonic Sensor-Based Bed-Exit Detection System for the Elderly With Early Notification

Chih Lung Lin, Po Ting Lee, Yuan Hao Ho, Zong Lin Yang, Yu Hsien Lu, Chi Yuan Chan, Pi Shan Sung

Research output: Contribution to journalArticlepeer-review

Abstract

This letter presents a real-time bed-exit alarm system using ultrasonic sensors, infrared (IR) sensors, and an accelerometer. The ultrasonic sensors detect the elderly in bed; the IR sensors detect the motion of the elderly across the gap at the end of the bed; and the accelerometer detects the bed rail being lowered. To achieve early notification, one-against-one support vector machine classifiers are implemented to recognize the early stages of bed-exit events with a sensitivity of 97.7% and a precision of 93.8%. The proposed system is verified with ten elderly subjects and provides an average lead time of 11.4 s for real bed-exit events, indicating that the proposed system has the ability to issue early warnings to caregivers for immediate assistance.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalIEEE Sensors Letters
Volume8
Issue number1
DOIs
Publication statusPublished - 2024 Jan 1

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Electrical and Electronic Engineering

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