Abstract
A noncontact photoacoustic imaging method based on optical quadrature detection is proposed. The photo-induced acoustic signal is detected by an optical method without contacting the specimen. By utilizing the intrinsic phase difference of a multiport optical interferometer, the quadrature signal of a conventional interferometric signal could be obtained. With this quadratic signal pair, we could reconstruct the photoacoustic signal without suffering from the initial phase drift that usually occurs in a conventional interferometric system. The performance of the proposed system is verified by imaging human hairs embedded in a polydimethylsiloxane resin block. The system’s lateral and axial resolutions are measured to be 84 and 86 μm at a 1.5 mm depth of a PDMS resin block, respectively. The experimental result is good enough to distinguish the hairs staggered in depth.
© 2019 Optical Society of America
Full Article | PDF ArticleMore Like This
Yi Wang, Yingxin Hu, Binyang Peng, Hongxian Zhou, Yuqian Zhao, and Zhenhe Ma
Biomed. Opt. Express 11(1) 505-516 (2020)
Seong Jun Park, Jonghyun Eom, Yong Ho Kim, Chang Su Lee, and Byeong Ha Lee
Opt. Lett. 39(16) 4903-4906 (2014)
Huanhao Li, Fei Cao, Yingying zhou, Zhipeng yu, and Puxiang Lai
Opt. Lett. 44(22) 5481-5484 (2019)