High-consistency photoacoustic excitation and detecting integrated fiber probe, manufacturing method and testing method thereof

Abstract

The invention discloses a high-consistency photoacoustic excitation and detecting integrated fiber probe, a manufacturing method and a testing method thereof. According to the probe, a light absorbingmaterial (such as graphene or molybdenum disulfide and the like) and an elastic material (PDMS) are combined and deposited on the end surface of a double-clad fiber, and high-power pulse laser is utilized for performing photoacoustic signal excitation. Furthermore a light-absorbing sensitive material and a single-mode fiber end surface form a Fabry-Perot (F-P) interference chamber for realizing photoinduced ultrasonic signal detection. The probe has a photoacoustic excitation function and a detecting function and can be manufactured and formed in one time. Furthermore because the light absorbing material is prepared through a chemical liquid phase deposition method, the high-consistency photoacoustic excitation and detecting integrated fiber probe has advantages of controllable thickness,low number of steps, high repeatability, etc. Therefore, the fiber type photoactoustic probe has advantages of photoacoustic signal receiving-and-transmitting integration, small size, simple manufacture, high consistency, high photoacoustic conversion efficiency, high electromagnetic interference resistance, etc. The high-consistency photoacoustic excitation and detecting integrated fiber probe can be used in the fields such as industrial nondestructive detection, biomedical ultrasonic and material characteristic measurement.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a photoacoustic excitation and detection integrated optical fiber probe, a manufacturing method and a testing method thereof. Background technique [0002] The photoacoustic effect refers to the phenomenon that an object produces an acoustic signal under periodically changing illumination. When the object is illuminated, it absorbs heat energy, and the elastic object will periodically vibrate under the accumulation of local heat, and release the heat energy in the form of mechanical energy to form an acoustic signal. Bell first discovered the photoacoustic effect (BELL A G. Upon the production and reproduction of sound by light [J]. Journal of the Society of Telegraph Engineers, 1880, 9(34): 404–426.). The bandwidth of the ultrasonic signal generated by the photoacoustic effect is related to the frequency of the excitation light, and the intensity is also related t...

AI Technical Summary

Problems solved by technology

However, piezoelectric ceramic probes are usually bulky, which is not conducive to miniaturization and integrated measurement

In contrast, fiber-optic ultrasonic probes have the advantages of small size, anti-electromagnetic interference, and convenient distributed detection. However, most current fiber-optic ultrasonic probes realize the excitation and detection of ultrasonic signals separately, and the photothermal absorption materials deposited on the end faces of optical fibers The thickness of the probe is uncontrollable, which significantly affects the consistency of the performance of the prepared probe

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