Electromagnetic ultrasonic transducer with improved resonance control and control method thereof

An electromagnetic ultrasonic and resonance control technology, which is applied in the generation of ultrasonic/sonic/infrasonic waves, the use of sound waves/ultrasonic/infrasonic waves for material analysis, instruments, etc. The effect of small wave content, high detection accuracy and large voltage gain

Inactive Publication Date: 2019-06-07
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the object of the present invention is an electromagnetic ultrasonic transducer with improved resonance control and its control method, using the envelope amplitude of the terminal ultrasonic echo signal as feedback to control the output frequency of the electromagnetic ultrasonic transducer, so that the excitation The coil excites the maximum power ultrasonic wave in the object to be tested to solve the technical problem that the existing detection method will excite a large number of harmonics in the object to be tested and then affect the detection accuracy

Method used

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  • Electromagnetic ultrasonic transducer with improved resonance control and control method thereof
  • Electromagnetic ultrasonic transducer with improved resonance control and control method thereof
  • Electromagnetic ultrasonic transducer with improved resonance control and control method thereof

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Embodiment 1

[0035] Embodiment one: if figure 1 As mentioned above, the electromagnetic ultrasonic transducer with improved resonance control in this embodiment includes a high-frequency power oscillation signal output circuit, a coil with a bias magnetic field, an echo signal detection circuit and a main controller.

[0036] The high-frequency power oscillating signal output circuit is composed of a high-frequency inverter drive circuit, an impedance matching network, and a static matching capacitor. The rear stage of the high-frequency inverter drive circuit is connected to the impedance matching network. A coil with a bias magnetic field is connected to the rear stage of the matching capacitor. A coil with a bias magnetic field is placed on the surface of the object to be measured with a certain lift-off distance. The high-frequency inverter drive circuit is used to generate a rectangular power pulse, and the rectangular power pulse passes through an impedance matching network, a stati...

Embodiment 2

[0043] Embodiment 2, the control method of the electromagnetic ultrasonic transducer with improved resonance control in this embodiment includes the following steps:

[0044] Step 1. The drive signal frequency f of the high-frequency inverter drive circuit is set at the initial frequency f0 Generate a rectangular power pulse, pass through the impedance matching network and static matching capacitor to excite the coil with a bias magnetic field, and excite the ultrasonic wave in the object to be tested, and the ultrasonic wave will reflect the ultrasonic echo after encountering a defect or a section;

[0045] Step 2, the ultrasonic echo acts on the coil with a bias magnetic field to change the voltage at both ends of the coil, and the voltage signal at both ends of the coil is input into the high-voltage isolation circuit, and then input to the main controller after passing through the echo signal filtering circuit, and the main controller collects The echo signal at this time, ...

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Abstract

The invention discloses an electromagnetic ultrasonic transducer with improved resonance control and a control method thereof. The electromagnetic ultrasonic transducer comprises a high-frequency power oscillation signal output circuit, a coil with a bias magnetic field, an echo signal detection circuit and a main controller. The high-frequency power oscillation signal output circuit is composed of a high-frequency inverter drive circuit, an impedance matching network, and a static matching capacitor. The echo signal detection circuit includes a high-voltage isolation circuit and an echo signal filter circuit. The main controller is used for collecting a filtered ultrasound echo signal and adjusting a high frequency inverter driving frequency based on envelope amplitude feedback of the ultrasonic echo signal. Besides, according to the control method of the electromagnetic ultrasonic transducer with improved resonance control, the power pulse voltage required by the electromagnetic ultrasonic transducer can be provided and the static matching capacitor and the coil work in a quasi-resonant state, so that a maximum power ultrasonic signal can be excited in the to-be-measured object and the harmonic content is small; and thus the detection precision of the electromagnetic resonance transducer with the improved resonance control is high.

Description

technical field [0001] The invention relates to the field of non-destructive flaw detection, in particular to an electromagnetic ultrasonic transducer and a control method thereof. Background technique [0002] The urgent need for industrial non-destructive testing technology has driven the development of electromagnetic ultrasonic transducer technology, improving the quality and influence of industrial products and the life of machinery and equipment. Electromagnetic ultrasonic testing technology has the advantages of no damage to the object to be tested, no need for couplant, fast propagation speed and long detection distance, etc., and is widely used in the field of non-destructive testing. [0003] The input impedance of the electromagnetic ultrasonic transducer will vary with factors such as temperature, load, parasitic parameters, and lift-off. When the output impedance of the driving power supply does not match the input impedance of the transducer, the excitation sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/34G01N29/22
Inventor 陈家伟侯帅丞张瑾方觅
Owner CHONGQING UNIV
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