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本文根据感应原理研制了一新的传感器用于记录胎儿运动和胎音。此传感器(INPHO)的顺应性可以与母体腹部的顺应性相匹配以提供母体腹部和传感器之间的最佳移位传递,这样就可在0.5～2.0Hz的频率范围内用INPHO信号的数字滤波来检测胎儿呼吸运动。可以进行单呼吸运动检测,这已由实时超声成象方法所证实。INPHO传感器的平坦频率响应为0.2～200Hz,传感器系统的信-噪比好于9.5dB,从而可以检测出十分微弱的运动和声音。处理过的信号的谱分析表明,胎儿呼吸是
In this paper, a new sensor based on the principle of induction has been developed for recording fetal movement and fetal tone. The compliance of this sensor (INPHO) can be matched to that of the maternal abdomen to provide optimal transfer of displacement between the maternal abdomen and the sensor so that it can be digitally filtered with the INPHO signal in the frequency range 0.5-2.0 Hz To detect fetal respiratory movement. Single-breath exercise testing can be performed, as demonstrated by real-time ultrasound imaging. The INPHO sensor’s flat frequency response is 0.2 to 200 Hz and the sensor-system signal-noise ratio is better than 9.5 dB, allowing for very weak motion and sound to be detected. Spectral analysis of the processed signal shows that fetal respiration is