The calculation of ultrasonic echo parameter by gauss - newton iterative method
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Denoising in pipeline ultrasonic echo - signal based on empirical mode decomposition
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( 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
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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
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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
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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
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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
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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
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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
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