Under-Water Imaging System with Multi-Frequency Ultrasonic Holography

نویسندگان
چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Tomographic Imaging Using Multi-Channel Low-Frequency Ultrasonic Measurement Systems

Multi-element ultrasonic transducer arrays open the possibility for rapid and flexible tomographic imaging systems. By electronic switching of the individual array elements, different schemes of reflection tomography and transmission tomography can be realized. This contribution firstly introduces general tomographic measurement principles to some detail. It then describes two multi-channel low...

متن کامل

Tailoring ultrasonic beams with optoacoustic holography

A combination of laser-induced ultrasound generation and ultrasonic holography for spatial control of the generated ultrasonic pulse is presented. Ultrasound is produced by absorption of laser pulses at an absorbing layer in a water tank via the optoacoustic effect. In order to produce a defined ultrasonic frequency in the MHz range, the laser pulses are harmonically time-modulated using an aco...

متن کامل

Performance of Ultrasonic Imaging with Frequency Domain Saft (f-saft)

The time and Fourier domain Synthetic Aperture Focusing Technique (SAFT and FSAFT) have been used to improve both sensitivity and lateral resolution of ultrasonic NDT. Following acquisition of signals over the surface of the tested piece, SAFT identifies a defect by summing all the signals within a certain area (the aperture) after giving proper time-delays. FSAFT, although using the same data,...

متن کامل

Ultrasonic Image Registration for Multi-Frequency Analysis

This paper describes ultrasonic image registration for multi-frequency analysis. The goal of our research is the portable and real time brain diagnosis under the thick-skull. The choice of ultrasonic frequency is a trade-off between spatial image resolution and imaging depth. This study shows the usability of data synthesis by employing two different frequency ultrasounds. In the first part of ...

متن کامل

Multi-beamforming for 3D ultrasonic imaging

This work describes the development of a new 3D ultrasonic imaging method that combines different beamforming techniques (Phased Array -PAand Synthetic Aperture Focusing Technique -SAFT-). The proposed methodology uses a silicone mask along the x-axis to produce a wide beam in the array width direction (y-axis). Then, a coherent-spatial composition of several phased array B-scan images is imple...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Transactions of the Japan Society of Mechanical Engineers

سال: 1978

ISSN: 0029-0270,2185-9485

DOI: 10.1299/kikai1938.44.1992