针对海底石油管道超声检测信号的噪声消除问题，本文研究了基于小波分析的噪声消除方法。
Aimed at noise cancelling cut for ultrasonic inspecting signal of seabed oil pipeline flaw, a kind of noise cancellation method based on wavelet analysis is studied.
但目前小波分析处理超声检测信号的应用领域还很有限，并且应用过程中没有考虑最优小波基的选取问题。
But now the field is finite that wavelet analyses is used in the ultrasonic testing signal processing, and the problem of selecting the best wavelet didn't be considered in the application of wavelet.
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。
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TA2钛合金超声检测信号去噪效果比较理想。
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.
方法仪器由介入超声硬度检测导管、生理信号单元和主机组成。
Methods the equipment was composed of intervention ultrasound stiffness detection catheter, physiological signal unit and mainframe.
结果表明：该方法提取的缺陷回波信号特征值，其可分性测度均值达91.7%，从而证明该方法对超声检测缺陷回波信号的特征提取是相当有效的。
The average value of separability measure is as high as 91.7%, which indicates that this method is quite effective in the feature extraction of ultrasonic flaw echoes.
现代信号处理与模式识别技术在超声无损检测与评价中的作用愈来愈重要。
Modern signal processing and pattern recognition have been playing an increasing important role in ultrasonic nondestructive testing and evaluation.
超声波能产生脉冲信号，用以检测金属中各种缺陷。
Ultrasonic waves produce pulsed signals, by means of which various defects in metal can be detected.
利用超声缺陷信号的时频域特征，较好地实现了该类型药柱的线性定量无损检测。
The linear and quantitative nondestructive test of the grain defect is realized by using time-frequency domain character of the ultrasonic defect signal.
晶粒噪声和缺陷信号的时频特征的差异，为提高超声检测的信噪比提供了可能。
The time frequency difference between grain noise and defect signal provide a possibility for enhancement of signal-to-noise ratio (SNR) in ultrasonic testing.
回波处理电路用于检测由人体组织反射的超声信息，对转换成的电信号进行解调输出。
Receiving circuits detect the wave reflected by human tissue and output electric signal that has been demodulated.
本文首先简要地介绍了医学电子学中人体超声信号的检测、处理及其特征提取所采用的方法及其技术特点。
Here medical Electronic methods and techniques are mainly introduced to detect, analyse and extract feature for human medical ultrasound signals.
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。
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.
设计了超声波传感器及信号转换与处理电路，并设计了相应的检测软件，在此基础上进行了浓度检测实验。
The ultrasound sensor, the signal transform and treatment circuits are designed. The testing software is developed. Then the experiments for the concentration testing are made.
讨论混凝土的超声波检测，包括其原理和装置，以及采用计算机对信号的处理、判断和自动测量的方法。
Ultrasonic nondestructive testing of concrete is described including its principle, instrument as well as the processing, identification and automatic measurement of signals with computer.
介绍了空气耦合非接触式超声检测技术基本原理，推导了该技术中信号传输衰减理论构成因式。
With the brief description of the basic principle of air-coupled non-contact ultrasonic testing, the factors affecting the whole signal path losses of air-coupled ultrasonic testing are deduced.
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。
According to the characteristics of ultrasonic signal, it can be used to deal with correlation technique to filter noise and improve resolution.
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。
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.
在此系统中，首先使用计算机来产生一个频率可调的超声波驱动信号，然后通过对马达转数的检测，系统得到压电超声马达的最佳谐振频率值。
In this system, a frequency-adjustable ultrasonic drive signal is made by computer, then based on the motor 's revolution number, system can automatically find the syntonic frequency of motor.
介绍了激光超声的机理、光激超声波信号的检测方法及其应用。
Principle and testing method of laser generated ultrasonic and its applications are introduced.
数字波束合成技术是相控阵超声检测相对于其它超声检测所特有的，也是整个信号接收处理系统的核心技术。
Digital beam forming (DBF) is special for phased array ultrasonic transducer compared to other ultrasonic nondestructive testing and is also the kernel technology of the whole signal-receiving system.
探讨了超声波检测信号归一化处理的方法，以及时域信号归一化和频域信号归一化的优缺点。
Normalization method of ultrasonic testing signal, the advantages and disadvantages of time domain, frequency domain were discussed.
用彩色多普勒超声检测脐动脉并获得多普勒信号，将此信号以音频形式输入计算机中，对此信号进行处理并计算分数维。
Umbilical arterial Doppler spectrum were obtained by color Doppler ultrasound, then Doppler signal were transformed into computer through sound frequency, and fractal were calculated.
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。
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.
对超声波信号检测采用本文提出的这种软硬件结合的预处理措施，结果显示能达到满足的抑制各种噪声和干扰的效果。
This combinational way of software and hardware to pre-process the receiving ultrasonic signals demonstrates the capacity to suppress noise and interferences efficiently.
文章综合报道了信号处理在超声检测的抑噪、缺陷的定性定量分析及优化驱动信号的几方面应用。
Signal processing methods used in ultrasonic testing are reviewed, which cover noise suppressing, QNDE and optimization of driving 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。
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.
系统以超声波作为检测信号源，采用多探头多方位扫描、液浸法的方式对齿轮进行检测。
The system uses ultrasonic wave as signal source, with the multi-probe multi-directions sweep, and fluid soak method test the gear.
系统以超声波作为检测信号源，采用多探头多方位扫描、液浸法的方式对齿轮进行检测。
The system uses ultrasonic wave as signal source, with the multi-probe multi-directions sweep, and fluid soak method test the gear.
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