Optical acoustic excitation and detection integrated probe based on side edge polishing and grinding fiber grating and manufacturing method and test method of optical acoustic excitation and detection integrated probe

Abstract

The invention discloses an optical acoustic excitation and detection integrated probe based on side edge polishing and grinding fiber grating and a manufacturing method and a test method of the optical acoustic excitation and detection integrated probe. A sensing unit of an optical acoustic signal excitation part is made of elastic base body materials and heat sensitive materials with high heat adsorption ability in a mixed manner and the surface of the side edge polishing and grinding fiber is coated with the sensing unit. Thus, by importing pulse laser into the sensitive materials, by use ofoptoacoustic effects, broadband acoustic signals can be excited. On the other hand, by fully using the sensitivity of the side edge polishing and grinding fiber grating to bending strain, detection of weak acoustic signals can be achieved. Thus, the probe is advantaged by simple manufacturing, small size, anti-electromagnetic interference ability, high photoacoustic energy conversion efficiency,big signal bandwidth and online distributed measurement; and meanwhile, through the small probe-type compact structure integrated with the optical acoustic excitation and detection, the probe has obvious application advantages in field of medical optoacoustic imaging, lossless detection, material science and the like.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a photoacoustic excitation and detection integrated probe based on side-polished optical fiber gratings, a manufacturing method and a testing method thereof. Background technique [0002] When a light beam is applied to a substance such as a solid, liquid or gas, the substance can be excited by absorbing the light energy, which is then converted (in whole or in part) into heat through a non-radiative process. If the beam is a pulsed beam or is periodically modulated, the object will produce periodic temperature changes, which will cause the material to expand with heat and contract with cold to produce periodic changes in stress and form sound waves. This phenomenon is called the photoacoustic effect (BELL A G. Upon the production and reproduction of sound bylight [J]. Journal of the Society of Telegraph Engineers, 1880, 9(34):404–426.). Since photoacoustic detecti...

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Problems solved by technology

The probe is composed of a side-polished fiber Bragg grating, and the polished area of ​​the side-polished grating is coated with a mixture of elastic matrix material and heat-absorbing sensitive material, which c

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