| 1. | The calculation of ultrasonic echo parameter by gauss - newton iterative method
超声回波参数的高斯与牛顿迭代法计算 |
| 2. | Denoising in pipeline ultrasonic echo - signal based on empirical mode decomposition
基于经验模态分解的管道超声回波信号噪声消除 |
| 3. | ( 2 ) based on the mode of ultrasonic echo , this paper designs a frequency - dependent compensation filter to compensate the absorbed attenuation when the ultrasound transmits in a tissue
( 2 )在建立超声回波信号的数学模型的基础上,设计了频率补偿滤波器。 |
| 4. | Ultrasonic bio - instrumentation is a kind of diagnostic instrument widely used in the clinic presently . it can examine the body by the scan of ultrasonic beam and display it by the brightness of ultrasonic echoes and then form the profiles of viscera and pathological changes
B型超声诊断仪是目前在临床中应用最广的一种超声图象诊断装置，它一般具有多种显示方式，如b型、 m型等。 |
| 5. | Defect location , representative defect and its ultrasonic echo characteristics corresponding of tungsten alloy shells had been systematically studied by both vertical wave sensors and transverse wave sensors calibrated after manufacturing
摘要采用纵波直探头和自磨制经校准的斜楔横波探头，对钨合金壳体部件进行了检测，并对钨合金壳体的缺陷定位、典型缺陷及其对应的回波特征进行了研究。 |
| 6. | Ultrasonic bio - instrumentation has several display modes used in medicinal field now , such as b - mode and m - mode , etc . b - mode uses the modulated brightness to represent the amplitudes of ultrasonic echoes , and the coordinates in the formed profiles correspond to positions of ultrasonic beam scans one by one
B型显示是用亮度调制来显示回波脉冲幅度，显示的横轴和纵轴与声束扫描的位置一一对应，形成超声切面图像。 |
| 7. | The system accomplishes ultrasonic pulse transmitting and receiving , signal amplitude adaptive adjusting , data acquiring , echo searching , data processing and analyzing . different algorithms for echo searching , filtering and time difference measuring are proposed based on the thorough analysis of ultrasonic echo signal
研制的超声波液压测量系统由超声波探头、超声波收发系统、高速数据采集系统和计算机构成,实现了超声波信号的发射、接收、自动增益控制、数据采集、自动搜索回波、数据处理、分析等功能。 |
| 8. | The paper presents a detailed scheme on the reliable recognition of the ultrasonic echo - signal in high noise background . based on the scheme , a detailed discussion of the application of the traditional digital processing methods in this field is proposed in this paper . based on the traditional methods of wavelet analysis , some of novel algorithms are also proposed in the paper and have been programmed using matlab
本文对高噪声背景下超声回波信号的可靠识别问题进行了深入研究，讨论了经典数字处理方法应用于这个问题的不足之处，并在小波分析的几种传统方法的讨论基础上，做了几点改进，以适合所要解决的超声回波信号的可靠识别问题，并进行了程序实现。 |
| 9. | The instrument adopts the theory of ultrasonic echo for quickly scanning river bed topography under water and employs the principle of resistance for measuring river bed topography upon water and shallow beach topography , which increases the measuring speed effectively and decreases the disturbing influence on river bed
该仪器采用超声测量原理实现了水下地形的无接触快速扫描测量，采用阻抗原理实现了洲滩、边滩、浅滩的地形测量，有效提高了测量速度，并减小了对河床的扰动影响。 |
