Small integrated two-dimensional opto-acoustic galvanometer excitation source

An excitation source, small technology, applied in the direction of material analysis, measuring device, instrument, etc. by optical means, can solve the problems of large mechanical vibration, time-consuming, complicated operation, etc., achieve good dynamic response characteristics, improve detection time, improve The effect of scanning accuracy

Inactive Publication Date: 2012-08-01
曾吕明 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the advantages of micro-focus energy and nanosecond pulse width, solid-state lasers are currently the common excitation source for photoacoustic technology, but many disadvantages such as large size, high price, and difficult maintenance have hindered the market promotion of photoacoustic technology.
[0004] For example, in 2006, Allen et al. reported that an array of four pulsed laser diodes was used as a photoacoustic excitation source to realize large-area two-dimensional photoacoustic imaging (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); in 2008, Maslov et al. reported that using a single amplitude-modulated continuous laser diode

Method used

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  • Small integrated two-dimensional opto-acoustic galvanometer excitation source

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Example Embodiment

[0017] Embodiment 1 The structure of this embodiment is as figure 1 As shown, the names of the components are: 1. light source, 2. computer, 3. acquisition circuit, 4. preprocessing circuit, 5. drive circuit, 6. ultrasonic array sensor, 7. collimating lens group, 8. X axis Galvanometer, 9. Y-axis galvanometer, 10. Focus lens group, 11. X-axis motor, 12. Y-axis motor.

[0018] The light source 1 uses a pulsed semiconductor laser diode (PGAS1S24, Hoffo), the working wavelength is 905nm, the peak power is 49W, the pulse width is 150ns, and the single pulse energy is about 7.3uJ; X-axis and Y-axis motors use precision servo motors, repeat The accuracy can reach 8μrad.

[0019] This example includes laser diode, collimating lens group, X-axis galvanometer, Y-axis galvanometer, focusing lens group, protective mirror, X-axis motor, Y-axis motor, housing; X-axis galvanometer and X-axis motor machinery Connection; the Y-axis galvanometer is mechanically connected with the Y-axis motor; th...

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Abstract

The invention provides a small integrated two-dimensional opto-acoustic galvanometer excitation source, which is formed by 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 and can achieve large-area, high-speed and high-stability small opto-acoustic excitation scanning. The small integrated two-dimensional opto-acoustic galvanometer excitation source applies fast and efficient two-dimensional laser galvanometer scanning technology to the field of opto-acoustic excitation, is integrally designed with the small-volume laser diode, and achieves small excitation of large-area opto-acoustic imaging.

Description

technical field [0001] The invention relates to a photoacoustic excitation technology, in particular to a small and integrated two-dimensional photoacoustic vibrating mirror excitation source. Background technique [0002] The laser galvanometer is a high-precision, high-speed servo control system composed of a driver board and a high-speed swing motor, which can easily realize two-dimensional deflection of the laser beam. It has the advantages of small size, fast response, high scanning speed, and large scanning range. And other advantages, currently widely used in laser marking, laser cutting, laser drilling and other fields. [0003] Photoacoustic technology is a newly developed non-invasive nondestructive testing technology based on the difference in optical absorption inside biological tissues and using ultrasound as the medium. Solid-state lasers are currently the common excitation source for photoacoustic technology due to their advantages of micro-focus energy and ...

Claims

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Application Information

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IPC IPC(8): G01N21/17
Inventor 曾吕明纪轩荣杨迪武
Owner 曾吕明
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