The ultrasonic signal travels through all common metal and plastic pipe materials.
超声波信号穿过所有常见的金属和塑料管材。
Laser ultrasonic signal is so weak that it can be detected only by high sensitivity system.
检测微弱的激光超声，要求系统具有较高的灵敏度。
The proposed system can be applied in various ultrasonic signal acquisition and processing because of its...
该系统具有较高的灵活性和可移植性，可用于多种超声信号的采集与处理。
The effects of the targeted microbubbles on the ultrasonic signal was observed in an artificial thrombus model.
另在体外制作人工血栓模型，在二维超声下观察微泡造影剂对声学信号的影响。
In addition, a laser ultrasonic signal generator is designed based on USB2.0 in the conception of virtual instrument.
另外，本文从虚拟仪器的概念出发，基于USB2.0提出并设计了激光超声系统的信号源。
Compared with the traditional threshold functions, the improved one was more advantageous in ultrasonic signal denoising.
相对于经典的阈值函数，改进的阈值函数在超声信号去噪中更具有优势。
Fractal properties of ultrasonic signal are researched based on normalized scale box-counting dimension method successfully.
基于归一化尺度计盒维数方法研究了超声波分形特征。
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。
According to the characteristics of ultrasonic signal, it can be used to deal with correlation technique to filter noise and improve resolution.
根据超声信号的特点，可以利用相干检测理论对信号进行处理，从而达到滤除噪声、提高分辨力的目的。
By using the digital means, the attenuation coefficient of the ultrasonic signal is measured, through which the sediment content can be obtained.
采用数字手段测取了超声波信号的衰减系数，通过衰减系数可得出含沙量。
After the hatch covers are closed, a transmitter generating an ultrasonic signal is placed in the cargo hold (empty or loaded with cargo) emitting ultrasonic waves.
当舱口盖被关闭时，产生的超声波信号的发射器被放置在货舱(空或装载货物)里发射超声波。
The ultrasonic defect echo of a austenite stainless steel with coarse grainswas acqiuired and processed using a developed computerized ultrasonic signal analysissystem.
采用计算机化超声信号分析系统，对奥氏体不锈钢粗晶材料缺陷的超声回波信号进行采集和加工。
Examples prove that the model can reflect the character of the ultrasonic signal and noise correctly, and the result of the denoising using this algorithm is satisfactory.
实例分析表明：该模型能基本反映超声检测信号的特点，而且此算法对钛合金超声检测信号去噪效果比较理想。
In the evaluation of welded joint using digital ultrasonic system, it is found that it is noise that constitutes the main difficulty in the detection of weak ultrasonic signal.
在用数字超声系统进行焊接接头评价时发现，噪声是微弱超声信号检测的主要障碍。
By using the peak detection algorithm in automatic gain control algorithm, we make use of the signal energy to measure the peak value of ultrasonic signal quickly and efficiently.
自动增益控制算法中的峰值检测算法使用信号能量的方法可以快速有效的测量得到超声波信号的峰值。
The wavelet coefficient of the feature band was regarded as the feature parameter of the Acousto Ultrasonic signal and it can distinguish defects from the adhesively bonded joints.
以此特征频带的小波变换系数作为声-超声信号特征参数，可分辨出胶接区域的缺陷信号。
The wavelet transform has a good performance of local analyzing in both time domain and frequency domain. It is fit for analyzing non-stationary signals, such as ultrasonic signal.
而小波具有“变焦距”特性，在时域和频域中具有良好的局部分析能力，适合于超声等非平稳信号处理。
The ultrasonic signal which is emitted from the transducer carries the input audio signal information, does the nonlinear interaction in the air and is demodulated into audible sound.
换能器发出的超声信号携带输入的音频信号信息，在空气中发生非线性作用，解调为可听声。
This paper attempts to preprocess ultrasonic signal by wavelet filtering based on the mathematical model of the ultrasonic echo, extracts weak echoes from signal with high noise background.
在超声反射回波的数学模型基础上，利用小波滤波方法对超声信号进行预处理，提取强噪声背景中的弱回波信号。
Noise, an important factor which impact on the performance of ultrasonic online testing system, has a direct influence on the signal-to-noise ratio's level of ultrasonic signal acquisition.
噪声是影响超声在线检测系统性能的一个重要因素，对超声采集信号信噪比的高低有直接影响。
First, wood specimens of standard and different types are made. Wood specimens are nondestructive tested by advanced ultrasonic test system, and copy relevant originality ultrasonic signal;
首先，构建了木材标准试件与不同类型的缺陷试件，采用先进的超声检测系统对木材试件进行超声无损检测，并记录下相应的超声原始检测信号；
With a model for the ultrasonic signal, the requirement on receiver and transmitter performance and the detection accuracy of the bearings of an ultrasonic borehole televiewer are discussed.
本文从超声波信号模型出发，对超声电视测井井下仪器的接收机、发射机的指标和方位检测精度进行了详细分析。
Aimed at the ultrasonic signal polluted by noises, which is low in SNR, a method of the ultrasonic signal denoising in wavelet domain based on an improved threshold function was put forward.
针对超声无损检测中超声信号受噪声污染、信噪比不高的情况，提出了一种新的基于改进阈值函数的小波域超声信号去噪方法。
Result Wavelet scalogram of blood flow ultrasonic signal had a higher distinguishability than STFT spectrogram in the low frequency portion, but had poorer decussation terms than spectrogram.
结果通过血流多普勒信号的小波尺度图研究科室，发现利用小波尺度图可以眼科提高血流多普勒信号低频段的频谱分辨率。
Examples prove that the model can reflect the character of the ultrasonic signal and noise signal correctly, and the result of the denoising using this algorithm for TA2 titanium is satisfaction.
实例分析表明，该模型能基本反映超声检测信号的特点，而且此算法对TA2钛合金超声检测信号去噪效果比较理想。
To realize this automatic test system, not only the newly developed automation technology and ultrasonic signal processing technique, but also the ultrasonic image processing technique was applicated.
同时，将超声成像和声图像处理技术应用到本系统中，实现了环形电子束焊缝超声检测的自动化。
The theory and method of ultrasonic inspection signal coupling have filled the country blank.
在超声波探伤信号耦合的理论和方法上，填补了国内空白。
The design of structure of ultrasonic transducer and circuit for signal disposing can realize dual air bubbles monitoring function.
设计了超声波换能器的结构和信号处理电路，能够实现二重气泡监测功能。
The design of structure of ultrasonic transducer and circuit for signal disposing can realize dual air bubbles monitoring function.
设计了超声波换能器的结构和信号处理电路，能够实现二重气泡监测功能。
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