基于电场传感器的人体坐姿监测

Monitoring Human Body Sitting Posture by Electric Field Sensor

研究表明经常处于同一姿势或者久坐都会对人体的健康造成危害,因此进行相应的坐姿监测并适时给出运动提醒是有必要的。将单只电场传感器安装在办公座椅靠背上,通过测量人体与传感器之间的相对运动,实现人体坐姿监测。人体背部与电场传感器之间的距离发生变化时,两者之间的耦合电容相应发生改变,导致电场传感器输出的电压信号幅值与形状发生变化,对信号特征进行分析即可得到人体坐姿和微动信息。信号经嵌入式系统处理后,坐姿类别以及相应时长可以传输到手机上进行实时显示。实验结果表明,从电场传感器的输出信号中,可准确分辨出座椅上人体的四种状态。

Studies have shown that often being in the same posture or sitting for a long time will cause harm to human health,so it is necessary to monitor the corresponding sitting posture and give exercise reminders in time.A single electric field sensor is installed on the backrest of the office chair to measure the relative movement between the human body and the sensor to realize the monitoring of the human sitting posture.When the distance between the back of the human body and the electric field sensor changes,the coupling capacitance between the two changes correspondingly,which causes the amplitude and shape of the voltage signal output by the electric field sensor to change.The signal characteristics can be analyzed to obtain the human sitting posture and micro move information.After the signal is processed by the embedded system,the sitting posture category and corresponding duration can be transmitted to the mobile phone for real-time display.Experimental results show that from the output signal of the electric field sensor,four states of the human body on the seat can be accurately distinguished.