AI Article Synopsis
- The proposed photo-acousto-optic tomography (PAOT) offers a noncontact method for photoacoustic sensing by eliminating the need for ultrasound transducers and coupling gel.
- The technique involves using a pulsed laser to generate acoustic waves, followed by a DC beam to detect the resulting photoacoustic signals, differing from standard photoacoustic microscopy (PAM).
- Preliminary results show that PAOT can effectively capture signals from a distance with good sensitivity, suggesting it could enhance practical applications of photoacoustic imaging.
Article Abstract
To avoid the use of ultrasound transducers and coupling gel in photoacoustic microscopy (PAM), we propose photo-acousto-optic tomography (PAOT) for noncontact photoacoustic (PA) sensing. The process consists of two parts. The first portion is the same as typical PAM, which employs a pulsed laser to induce acoustic waves. The difference from typical methods lies in the second part of the process, which applies a DC beam, rather than a conventional transducer, to sense the PA signal. A two-beam optical microscope system was designed to verify the PAOT effect, whereby an AC spot acted as the source to induce a PA signal, while a DC beam is applied to induce the acousto-optic effect for detection of the acoustic wave. We demonstrated the preliminary result that 5-100 Hz AC radiation could derive PA waves in a water-like medium along with detection sensitivity as high as 4.9%-10.0%; besides, the signal waveform could be detected by a DC spot 10-100 μm away for noncontact sensing with detection sensitivity of about 3.7%-10.4%. Without the need for a transducer or coupling gel, PAOT has the potential to modify conventional PAM into a pure optical system, which could make PA imaging more promising in practical applications.
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| http://dx.doi.org/10.1364/AO.53.000E47 | DOI Listing |
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