Broad-frequency high-power electromagnetic exciting device

Abstract

The invention belongs to the field of non-destructive testing technology and relates to a broad-frequency high-power electromagnetic exciting device which comprises a burst pulse generating circuit, an analog switch, a transformer and at least two power amplification units. Each power amplification unit comprises a signal amplification circuit, an added circuit, a current buffer, a field-effect tube voltage follower circuit and a field-effect tube current amplification circuit which are connected in sequence; each added circuit is connected with a potentiometer; the burst pulse generating circuit is connected with the input end of the analog switch; the enable end of the analog switch is connected with the output end of an over-power detection circuit; all output ends of the analog switch are respectively connected with the signal amplification circuits; the field-effect tube current amplification circuits are connected with the input end of the transformer; the input end of the over-power detection circuit is connected with one output end of the transformer; and the other output end of the transformer is used for driving a load. The exciting device can be used for the signal power amplification with a 1 KHz-20 MHz broad frequency range, and can be widely used for driving non-destructive testing sensors of ultrasonic guided wave, electromagnetic acoustic transducer and the like, and has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to an electromagnetic excitation device that can be used for sensors for nondestructive testing such as ultrasonic guided wave (GW) and electromagnetic ultrasonic (EMAT). Background technique [0002] Today's non-destructive testing technology is developing towards non-stop testing technology. With the development of non-stop testing technologies such as ultrasonic guided wave and electromagnetic ultrasonic and the development of related instruments, there is an urgent need for a device that provides electromagnetic excitation for these testing sensors. [0003] The electromagnetic excitation device is actually a special power amplifier. Common power amplifiers include Class A and Class AB power amplifiers. In recent years, with the development of digital power amplifier technology and high-power field effect tube manufacturing technology, higher efficiency...

AI Technical Summary

Problems solved by technology

However, this excitation device is only suitable for the excitation of piezoelectric ultrasonic probes, and piezoelectric ultrasonic probes are capacitive loads, so the excitation device disclosed in this document is not suitable for driving inductive loads such as magnetostrictive guided waves and electromagnetic ultrasonic waves. Coil transducers used in detection technology

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