摘要
本文报道一种数字式电阻抗血流容积描记仪，它利用数字系统来测量人体肢体段的组织阻抗和动脉容积变化。50KHZ频率的阻抗信号在它的峰值被采样，包络用来跟随容积变化，因而不需要相敏解调器来提取容积变化的包络信号。仪器又提高了信号的频率和幅度的稳定性，并且改善了信号的信噪比。
The design of an digital impedance plethysmograph capable of measuring tissue impedance and volume change of the ateries during endsystole is reported, The 50KHz frequency impedance signal is sampled at itspeaks and the envelope is used to follow the volume change without phase sensitive demodulator. It makes frequency and amplitude of the signal more stable and an improved signal to noise ratio.
出处
《中国医疗器械杂志》
CAS
1997年第1期42-45,共4页
Chinese Journal of Medical Instrumentation
