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Distributed type fiber laser ultrasonic transducer

A distributed optical fiber, laser ultrasonic technology, applied in the field of ultrasonic detection, to achieve the effect of increasing the number

Active Publication Date: 2015-07-01
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

However, using this scheme to obtain multi-point ultrasonic excitation needs to be subject to certain conditions

Method used

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  • Distributed type fiber laser ultrasonic transducer
  • Distributed type fiber laser ultrasonic transducer
  • Distributed type fiber laser ultrasonic transducer

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Refer to attached figure 1 As shown, the distributed fiber laser ultrasonic transducer based on the tilted grating phantom mode coupling strength and wavelength control of the present invention includes: laser seed light source 1, high-power optical amplifier 2, high-power optical isolator 3, tilt The grating string 4, the above-mentioned components are sequentially connected to form the ultrasonic transducer. Among them, the inclined grating string contains a series of grating units with different phantom mode working wavelengths: the first grating unit 5, the second grating unit 6, ..., the Nth grating unit 7, and these grating units are arranged according to the working wavelength from short to long, arranged in order from the upstream of the fiber link to the downstream of the fiber link, and ensure that the phantom mode working wav...

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Abstract

The invention provides a distributed type fiber laser ultrasonic transducer based on tilted grating cladding mode coupling intensity and wavelength control. A laser seed light source, a high-power light amplifier, a high-power light isolator and a tilted grating string are sequentially connected to form the ultrasonic transducer. The tilted grating string comprises multiple grating units of different phantom mode working wavelengths, and each unit comprises multiple tilted gratings of the same working wavelength and different phantom mode coupling intensities. Part of a section of fiber claddings, close to the gratings, in an optical fiber link in front of each tilted grating are removed and filled with absorption materials, so that energy of phantom modes in the fiber claddings is released and absorbed, and the thermal elastic expansion effect is used for stimulating ultrasonic sound. The distributed type fiber laser ultrasonic transducer based on tilted grating cladding mode coupling intensity and wavelength control has the advantages of being simple in structure, convenient to operate, high in distributed type capacity and anti-electromagnetic interference, and the like, can be widely applied in the fields of medical diagnosis, ultrasonic testing, structural health monitoring and the like, and has very high application prospects.

Description

technical field [0001] The invention relates to the technical field of ultrasonic detection, in particular to a distributed ultrasonic sensor. Background technique [0002] Laser ultrasonic excitation is an indispensable key technology in active ultrasonic testing, and is widely used in medical diagnosis, material property analysis, structural health diagnosis and other fields. The current mainstream ultrasonic excitation device is a piezoelectric ceramic ultrasonic generator transducer. However, it has the disadvantages of large size, susceptibility to electromagnetic interference, and requires at least two power lines for each generator, so it is not suitable for permanent embedded structures. In contrast, fiber-based laser ultrasonic transducers overcome the above-mentioned shortcomings of piezoelectric ceramic ultrasonic excitation devices. The fiber laser ultrasonic transducer uses the energy transmitted in the optical fiber to cause the thermoelastic expansion of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B06B1/00A61B8/00
Inventor 田佳峻李苑全明冉姚勇
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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