Title :
GHz ultrasonics with arbitrary code excitation
Author :
Merilainen, A.I. ; Kananen, V. ; Fridlund, C. ; Eskelinen, J. ; Haeggstrom, Edward ; Raum, Kay
Author_Institution :
Dept. of Phys., Univ. of Helsinki, Helsinki, Finland
Abstract :
Recently we developed a high frequency coded signal ultrasound microscope based on quadrature modulation [1, 2]. The device allowed pulse-echo operation at 300 MHz, however, local oscillator crosstalk reduced the SNR of pulse compression. To achieve GHz-range operation we present an improved design with new RF-components. The new design improved SNR by 16 dB compared to [2]. We also investigated the use of a dual-band chirp to further reduce the local oscillator interference. We successfully tested the device with a GHz ultrasound transducer in 0.9-1.1 GHz band using an arbitrary TX code. This achievement is a first step towards bringing the advantages of coded excitation into GHz ultrasound microscopy.
Keywords :
UHF detectors; acoustic microscopes; acoustic microscopy; codes; crosstalk; interference suppression; oscillators; pulse compression; ultrasonic transducers; RF-component; SNR; arbitrary TX code excitation; dual-band chirp; frequency 0.9 GHz to 1.1 GHz; frequency 300 MHz; high frequency coded signal ultrasound microscope; local oscillator crosstalk; local oscillator interference reduction; pulse compression; pulse-echo operation; quadrature modulation; ultrasound microscopy; ultrasound transducer; Acoustics; Chirp; Dual band; Microscopy; Signal to noise ratio; Transducers; Ultrasonic imaging; Arbitrary coded signals; GHz ultrasound microscopy; Modulation; Pulse Echo Switch;
Conference_Titel :
Ultrasonics Symposium (IUS), 2013 IEEE International
Conference_Location :
Prague
Print_ISBN :
978-1-4673-5684-8
DOI :
10.1109/ULTSYM.2013.0181
