Design and characterization of acoustic 4f imaging system by using an optical microring ultrasound detector

Hyoung Won Baac; Tao Ling; L. Jay Guo

doi:10.1117/12.841206

23 February 2010 Design and characterization of acoustic 4f imaging system by using an optical microring ultrasound detector

Hyoung Won Baac, Tao Ling, L. Jay Guo

Author Affiliations +

Proceedings Volume 7564, Photons Plus Ultrasound: Imaging and Sensing 2010; 75642N (2010) https://doi.org/10.1117/12.841206
Event: SPIE BiOS, 2010, San Francisco, California, United States

Abstract

We propose an acoustic 4f imaging system by using a pair of acoustic lens and an optical microring ultrasound detector (OMUD). The system was designed to have a long range imaging, and the signal strength was enhanced by a factor of ~13 by using an acryl-based acoustic lens at an imaging distance of close to 10 cm. The acoustic signal had a broadband and high frequency spectrum for a given focal distance owing to the unique characteristic of the OMUD. The imaging was obtained without using any reconstruction algorithms. Several performances of the designed system have been investigated by using photo-acoustic microspheres (301 μm in diameter) which are excited by pulsed laser beam. The resolution of images were compared, which consist of full frequency spectrum and harmonic frequency components. With high frequency (10 MHz and 15 MHz), the images showed consistently better resolutions (440 μm and 370 μm) for the microsphere. Frequency analysis of a time-domain signal waveform showed that the signal spectrum of the current system extends up to 20 MHz.

Citation Download Citation

Hyoung Won Baac, Tao Ling, and L. Jay Guo "Design and characterization of acoustic 4f imaging system by using an optical microring ultrasound detector", Proc. SPIE 7564, Photons Plus Ultrasound: Imaging and Sensing 2010, 75642N (23 February 2010); https://doi.org/10.1117/12.841206

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