Ultrasonic pulse-echo technology is widely used in medical diagnostics. This application must be based on the further development of medical ultrasound equipment as a prerequisite.
The electroacoustic transducer material required for ultrasonic echo technology is generally piezoelectric (a material that generates a voltage when pressure is applied to a surface, translator's note). The analysis of such transducers is critical to the application of ultrasonic echo technology. In addition, each transducer is represented by a specific vibration image, which is determined by the pressure field used in the modeling. In fact, from the work of Shaw and Sujir, it can be seen that the vibration images of the transducers are radially dispersive rather than uniformly dispersive. In addition, they suggest that the difference in vibration images allows one to select a sensor for a particular condition. This, in turn, would further help one to understand the signals received.
To this end, a variety of new methods have been developed over the last decade. The main one of these new methods is documented by Harris's work log. The impulse response method is by far the most effective way of using the instantaneous ultrasonic characterization technique. The impulse response method was discovered by Stepanishen. This method has become commonly used for time-domain analysis and large-scale sound field analysis.
It's a bit tricky at the back, I'm looking at 。。。。。。 The latter is a bit tricky, so be patient, I'll do my best, but most likely the translation won't be as good as the earlier one, because it does get more difficult. If you have any questions, I'll discuss them when I'm done
In the field of instantaneous ultrasound (it took me a while to find out what the term was), the method of radiation from a planar piston emanating from a rigid, reflective object immersed in a non-destructive fluid (again, I didn't look up the term) has been reported a number of times. This method is able to determine the shape of an irregular surface by measuring the echo. Part I: theory, J. Acoust. Soc. Am. 90 (1991), pp. 2799-2807. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (1991), pp. 2799-2807. Cited By in Scopus (26) (it's a reference, right?) . In the case of dispersed point reflectors, it takes a lot of work to accurately measure their echoes and determine their structure (difficult, I paraphrase). Weight and Hayman were the first to discover this problem, while Ueda and Ichikawa's model solved the problem of weakly scattering layers that do not reflect sound waves well. For more complicated cases, such as reflectors with complex surface morphology or irregular electrical resistance, Lhemery and Buiochi et al. and Szabo et al. were responsible for the study. （
In the time domain, the waveform of the received pressure field is determined based on the overall radiation of the sensor and the dispersed waveform radiated by the sensor and the edge of the reflector. This theory was first proposed by Kozina and Makarov. The concepts of plane and fringe waves were introduced by Young after 1802. The concepts of plane and edge waves are very beneficial for practical applications.
The translation is done, I tried my best. If you have any questions, please contact me. I think this translation is not easy in other people's eyes, since no one has answered such a high score