【摘要】 <正> 1 仪器组成及工作原理1.1 仪器组成本文所用调制型脉冲超声Doppler血流检测仪主要由三部分组成,即主机部分、记录部分及Doppler信号处理与频谱分析部分。其主要技术指标是,工作频率:5.0±0.000002MHz,辐射声强:连续正弦波小于8.0mW/cm~2,调制脉冲波小于2.0mW/cm~2;调制脉冲频率,为7.5kHz;空间采样尺寸,1.0～15.0mm可调;空间采样分辨率,1.5～2.0mm;可测深度,0.0～8.0±0.1cm;诊断深度,连续波0.0～3.0cm,脉冲波0.4～3.0cm;更多还原

【Abstract】 The operational principle and the circuit composition of the pulsed ultrasonic blood flow detector are described.The results of clinical application indicate that the detector can provide reliable parameter basis for clinical diagnosis and medical study.更多还原