热敏法呼吸频率监测电路设计  

The design for respiratory frequency detection circuit using thermosensor

作　　者：何庆华[1] 吴宝明[1] 

机构地区：[1]第三军医大学野战外科研究所,重庆市400042

出　　处：《医疗卫生装备》1999年第5期13-14,共2页Chinese Medical Equipment Journal

摘　　要：设计了一种实用的热敏法呼吸频率检测电路，分别采用PN结温度传感器和热敏电阻作为传感器，设计了相应的放大、滤波、波形变换电路，得到反映呼吸频率的数字信号，便于与单片机接口，电路简单实用，功耗小，抗干扰能力强。This paper introduces a circuit design for respiratory frequency detection by means of thermosensor, which uses PN junction conductor and thermal resistance as its sensor. The amplifying, filtering and signal transforming circuit are also designed to get digital signal representing the respiratoryfrequency so that the signal will interface with microprocessor. It is characterized by simplicity andavailability of circuit, lower power consumption and high capacity of anti - noise.

关 键 词：呼吸频率 监测 热敏传感器 电路设计 

分 类 号：R443.6[医药卫生—诊断学]