国产欧美精品一区二区,中文字幕专区在线亚洲,国产精品美女网站在线观看,艾秋果冻传媒2021精品,在线免费一区二区,久久久久久青草大香综合精品,日韩美aaa特级毛片,欧美成人精品午夜免费影视

Respiratory inductive plethysmography(RIP) technology for measuring parameters of breathing has been widely accepted. However, due to small changes (less than few hundred nH) of the inductance caused by the human respiratory movements,general stimulating signal that stimulates the inductive coils can hardly guarantee the precision and the suitability of RIP system. To solve this problem ,this paper present a design combined the technologies of the precision constant current source, the lock-in amplifier and the automatic gain control amplifier. The electric circuit characteristics of the design was also elaborated in this paper. With the breathing measuring experiment on 14 subjects which measured tidal volume and breath rate under quiet breath and forced breath and compared with the result from the pneumotachograph manufactured by JAEGER. The results show that breath rate and other respiratory parameters from our system have a high positive correlation with the those from pneumotachograph.The system was proved to be working at stable and measuring in a better precision.,due to the simple operations, convenience in carrying and the low-power , the system will meet the future demands on the long time ambulatory respiratory monitoring in the clinical. 