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Title: Dual-pulse nonlinear photoacoustic imaging : physics, sensing and imaging system design
Authors: Gao, Fei
Feng, Xiaohua
Zhang, Ruochong
Liu, Siyu
Ding, Ran
Zheng, Yuanjin
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Gao, F., Feng, X., Zhang, R., Liu, S., Ding, R., & Zheng, Y. (2018). Dual-pulse nonlinear photoacoustic imaging : physics, sensing and imaging system design. Proceedings of 2017 IEEE 12th International Conference on ASIC (ASICON), 600-603. doi:10.1109/ASICON.2017.8252547
Abstract: Photoacoustic sensing and imaging techniques have been studied widely to explore optical absorption contrast based on nanosecond laser illumination. In this paper, we report a long laser pulse induced dual photoacoustic (LDPA) nonlinear effect, which originates from unsatisfied stress and thermal confinements. Being different from conventional short laser pulse illumination, the proposed method utilizes a long square-profile laser pulse to induce dual photoacoustic signals. Without satisfying the stress confinement, the dual photoacoustic signals are generated following the positive and negative edges of the long laser pulse. More interestingly, the first expansion-induced photoacoustic signal exhibits positive waveform due to the initial sharp rising of temperature. On the contrary, the second contraction-induced photoacoustic signal exhibits exactly negative waveform due to the falling of temperature, as well as pulse-width-dependent signal amplitude. An analytical model is derived to describe the generation of the dual photoacoustic pulses, incorporating Gruneisen saturation and thermal diffusion effect, which is experimentally proved in vivo.
ISBN: 978-1-5090-6626-1
DOI: 10.1109/ASICON.2017.8252547
Rights: © 2017 IEEE. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:EEE Conference Papers

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