For this purpose they generate a high frequency ultrasonic pulse the echo of which is detected and evaluated by the sensor.
为此，他们产生高频率的超声波脉冲回波是由传感器检测和评估。
High frequency ultrasonic power supply controlled by AT89C51, can adjust its power, frequency and phase in high performance.
以单片机at89c 51控制的高频超声电源，其功率、频率及相位可进行有效的调节。
The mechanism and kinetics of parathion degradation was investigated under high frequency ultrasonic irradiation in aqueous solution.
研究了高频超声降解水溶液中对硫磷的反应动力学以及机理。
As we have learned, breed of this kind of software is various, the principle of place introduction is to use high frequency ultrasonic to come drive midge.
据了解，这类软件品种繁多，所介绍的原理都是用高频超声波来驱蚊。
On the aspect of hardware, they include: narrow pulse and high frequency ultrasonic sensor's design, high frequency signal generator and receiver's design, high speed data completed sampling's design.
因此本文还详细阐述以下内容：硬件方面采用了高频窄脉冲信号发生及接收放大电路、高速数据采集电路；
Methods High-frequency ultrasonic findings in 17 cases with PVNS were analyzed and a comparison between surgical and pathological results was made.
方法分析17例PVNS的高频超声表现，并与手术病理结果进行对照分析。
Ultrasound Biomicroscopy(UBM)is a new ultrasonic equipment with high-frequency transducer by which structures in the anterior part of eyes can be real-time observed and measured exactly.
超声生物显微镜（UBM）是一种专供眼前段检查的新型超声设备，具有简便、实时、无创等特点，不仅可清楚显示眼前段形态结构，并且可进行定量检测。
Ultrasonic technology is based on high-frequency sensors to measure the sound.
超声波技术是根据高频率的声音感应来测量的。
Radio frequency ultrasonic technique for metal brazed high-density honeycomb structures and defect recognition are described.
利用射频超声技术检测大密度金属钎焊蜂窝构件及缺陷识别技术。
Methods 25 patients who had foreign body inside the digestive tract but the X-ray exploration was negative, were exarnined with ultrasonic inspection with high and Iow frequency detecting head.
方法对25例有明确异物吞入史，但X线探查为阴性的患者，运用超声高、低频探头对可疑部位进行探查定位。
A digital signal processing way is established to obtain ultrasonic signal frequency shift in the test of high sand content fluid flow.
笔者采用数字手段去测取超声波信号的频差，通过频差法可得出流体的平均速度，进而获得高含沙量流体的流量。
A kind of high frequency pulse electrical source at the need of electromagnetic ultrasonic experiments is presented.
针对电磁超声实验对脉冲电源的需求，研制了一种高频脉冲电源。
Tapping in the former Soviet Union is the major research high-frequency tapping, tapping developed a dedicated ultrasound machine and the corresponding axial ultrasonic head.
前苏联在攻丝方面主要研究的是高频攻丝，研制有专用轴向超声攻丝机床和相应的超声头。
This study designed a system to generate ultrasonic-frequency pulsed plasma cutting arc, and experimentally investigated the vibration characteristics of the high frequency pulsed arc.
本研究设计了一种超声频脉冲等离子切割电弧发生系统，并通过实际切割试验，测试、分析了这种高频脉冲电弧的振动特性。
GIS partial discharge; ultrasonic detection; ultra-high frequency detection.
GIS局部放电；超声波检测法；超高频检测法。
Results High-frequency ultrasound identification was used in 11 patients, and real-time ultrasonic guidance was used in 29 patients.
结果11例经高频超声标记、29例经高频超声实时引导静脉穿刺均一次成功。
This waveform generator has been successfully applied in ultrasonic sen - sor to generate high-frequency ultrasonic wave.
该波形发生器已经成功地应用于超声波发射换能器中。
Ultrasonic devices use sound waves of extremely high frequency.
音波装置使用极高频率的声波。
D seismic modeling experiment system mainly includes 3d auto control scanning, high speed sampling, ultrasonic pulse or varying frequency signal emitting, etc.
三维地震模型实验系统主要包括三维坐标自动控制、高速数据采集、超声脉冲或可变频正弦信号发射等装置。
Uses the fission style structure, high frequency connection with jack on is used between the shaken-board and the ultrasonic generator, useful and maintains conveniently.
采用分体式结构，震板与超声波发生器之间采用带插座的高频连接，使用及保养均方便。
Methods High frequency probe is applied in 20 cases of eye and orbit tumor with multiple setions to observe the features of ultrasonic imaging.
方法用高频探头对眼内及眶内肿瘤患者进行多切面扫查以观察肿物的声像图特征。
Ultrasonic liposuction ultrasonic generator through the high-frequency energy into electrical energy to generate ultrasonic waves.
超声吸脂术是通过超声发生器将电能转变成高频能，产生超声波。
Ultrasonic liposuction ultrasonic generator through the high-frequency energy into electrical energy to generate ultrasonic waves.
超声吸脂术是通过超声发生器将电能转变成高频能，产生超声波。
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