Magnetostrictive sensor for steel stranded wire supersonic guided wave detection

Abstract

The utility model discloses a magneto-stretch sensor used for detection of ultrasound ultrasonic waveform, which belongs to the technical field of acoustic sensors. Bias magnetic circuit which is provided with a plurality of steel stranded wires (1), a jaw (2), a saddle (3), a permanent magnet (4) and a yoke iron (5) makes the magnetic field generated in the steel stranded wires (1) to rotate with the field biased along the direction of the magnetic field. The excitation signal issued by signal generator enter the first enameled wire (7) after being enlarged in a power amplifier. An alternating current magnetic field is produced by the stranded wires in an incentive-in solenoid sensor (6), the coordination of the bias magnetic field and the alternating magnetic field caused by the magnetic domain in the stranded wires are swung back and forth along the axial direction of the magnetic domain, and the change of the magnetic domain is received to the receiving end of the solenoid sensor. The signal is received to the oscilloscopes by a second enameled wire (8), and the waveforms of the signal are displayed by the oscilloscope. The utility model has the advantages that the utility model has low price, ultrasound guided wave can be detected without grinding end face of the stranded wires, and repeatability and operability of detection are improved effectively.

Description

technical field [0001] The invention relates to a magnetostrictive sensor for ultrasonic guided wave detection of steel strands, which belongs to the technical field of acoustic sensors, and its function is to convert the electromagnetic energy generated by the sensor into mechanical energy (sound energy) through the The analysis of mechanical energy (sound energy) is used to detect the prestress size of the steel strand, the presence or absence of defects, etc. Background technique [0002] Nowadays, most of the sensors used to detect the prestress size and defects of steel strands are piezoelectric chip sensors. When this kind of sensor is used, the end face of the steel strand needs to be polished to be quite smooth and flat, and a special clamp must be used to tightly fix the piezoelectric sheet on the end face after grinding. Therefore, a lot of inconvenience is brought to the actual detection, and because the perpendicularity between the end face and the axis cannot b...

AI Technical Summary

Problems solved by technology

Therefore, it brings a lot of inconvenience to the actual detection. At the same time, after each grinding, the perpendicularity between the end face and the axis cannot be guaranteed to be a certain value, so the repeatability of the detection is poor.

Images