Portable real-time opto-acoustic imaging system

Abstract

The invention provides a portable real-time opto-acoustic imaging system for integrating a two-dimensional laser galvanometer and a laser diode, which is formed by a central processor, a driving circuit, a data collecting circuit, a signal amplifying circuit, a signal preprocessing circuit, an ultrasonic sensor, a circuit external port, a laser diode, a collimating lens group, an X-axis reflecting galvanometer, a Y-axis reflecting galvanometer, a focusing lens group, a protective lens, an X-axis motor, a Y-axis motor and a casing. The portable real-time opto-acoustic imaging system applies fast and efficient two-dimensional laser galvanometer scanning technology to the field of multi-dimensional opto-acoustic imaging, is integrally designed with a small-volume laser diode in portable mode, achieves large-area opto-acoustic imaging and can be widely applied to the field of detection of square, tubular or film-shaped materials with complex structures, industrial fault detection, medical imaging and the like.

Description

technical field [0001] The invention relates to a photoacoustic imaging technology, in particular to a portable real-time photoacoustic imaging system. Background technique [0002] The laser scanning galvanometer is a high-precision, high-speed servo control system composed of a drive board and a high-speed swing motor. It is widely used in laser marking, laser cutting, laser drilling and other fields. It is incident on the X and Y axis mirrors, and the reflection angles of the mirrors are controlled by the computer to scan along the X and Y axes respectively, so as to realize the two-dimensional deflection of the laser beam, so that the laser focus point with a certain power density is on the target material according to the specified Motion scanning is required. This technology has the advantages of fast response speed, high scanning speed, large scanning range, good optical path sealing performance, and strong adaptability to the environment. It has become a mainstream ...

AI Technical Summary

Problems solved by technology

At present, photoacoustic imaging generally adopts the detection mode of unit ultrasonic sensor scanning and receiving photoacoustic signals. For example, in 2009, Gamelin et al. reported a real-time two-dimensional photoacoustic imaging method with solid-state laser excitation and multi-element ring array sensor reception (J. Gamelin, A . Maurudis, A. Aguirre, F. Huang, P. Y. Guo, L.V. Wang, and Q. Zhu, “A real-time photoacoustic tomography system for small animals,” Opt. Express 17, 10489-10498, 2009.); although the The method does not require ultrasonic sensors for mechanical scanning, but requires a large-volume solid-state laser to provide pulsed laser light with a large spot to achieve two-dimensional photoacoustic imaging. The system is difficult to miniaturize and portable structure design

Allen et al reported a two-dimensional photoacoustic imaging method using a miniaturized semiconductor laser as an excitation source in 2006 and 2007 (T. J. Allen, and P. C. Beard, “Pulsed near-infrared laser diode excitation system for biomedical photoacoustic imaging ," Opt. Lett. 31(23), 3462-3464, 2006; T. J. Allen, and P. C. Beard, "Dual wavelength laser diode excitation source for 2D photoacoustic imaging," Proc. SPIE 6437, 1U1-1U9, 2007.); Since this method requires the unit ultrasonic sensor to perform mechanical circular scanning to obtain photoacoustic signals in different directions, in the long time-consuming and multi-directional mechanical scanning process of the ultrasonic sensor, unstable factors such as mechanical vibration and random parameter drift of the long-term work of the instrument will affect the The random error brought about by the result is large, which seriously affects the imaging quality and the time resolution, reliability and stability of the research results, and has considerable limitations in practical applications.

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