Torsional mode magnetostrictive sensor used for minor-diameter metal bar
A technology of magnetostriction and torsional mode, which is applied in the direction of instruments, scientific instruments, ultrasonic/sonic wave/infrasonic wave generation, etc. It can solve the problems of excitation torsional mode ultrasonic guided wave, etc., and achieve the effect of easy disassembly and simple structure
Active Publication Date: 2015-06-03
北京中盈盘古智能技术有限公司
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Problems solved by technology
[0002] The current torsional mode ultrasonic guided wave magnetostrictive sensors are mostly used in some large-scale structures such as pipes and steel cables, mainly for length and defect detection, but it is difficult to excite torsional mode ultrasonic guides in metal rods with a diameter of less than 10 mm. Wave
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[0012] Such as figure 1 As shown, the internal structure of the torsional mode magnetostrictive sensor for small-diameter metal rods consists of three parts: iron-cobalt alloy patch 2, support sleeve 3 and induction coil 4. The iron-cobalt alloy patch 2 magnetized by the bias magnetic field and the surface of the small-diameter metal rod 1 are filled with epoxy resin glue for pasting. The induction coil 4 is wound on the support sleeve 3 ; the small-diameter metal rod 1 is inserted into the support sleeve 3 and maintains a clearance fit relationship with the support sleeve 3 .
[0013] figure 2 Shown is a schematic diagram of the arrangement of the iron-cobalt alloy patch 2 on the small-diameter metal rod 1 with a diameter of D. Before the iron-cobalt alloy patch 2 is pasted on the surface of the small-diameter metal rod 1, pre-bending treatment is required to Form a flexible ring structure. The length L of the single-section iron-cobalt alloy patch 2 is equal to the circu...
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Abstract
The invention discloses a torsional mode magnetostrictive sensor used for a minor-diameter metal bar and belongs to the technical field of electromagnetic acoustic sensors. The sensor comprises a ferrocobalt patch, a support sleeve, an inductive coil, a protective shell and a bayonet nut connector (BNC) interface. The ferrocobalt patch which is magnetized by a bias magnetic field is curled and sticked on the surface of the minor-diameter metal bar; and the clearance fit is kept between the minor-diameter metal bar and the support sleeve and the minor-diameter metal bar is inserted into the support sleeve to facilitate dismounting and mounting. An inductive coil is wound around the support sleeve. The support sleeve is embedded in the protective shell and is installed at the end part of the metal bar with the protective shell. The BNC interface which is fixedly arranged on the protective shell is connected with output and input ports of the inductive coil. The sensor disclosed by the invention can realize the stimulation and the reception of torsional mode ultrasonic guide waves in the minor-diameter metal straight bar and is used for the measurement of liquid viscosity coefficients.
Description
Technical field: [0001] The invention relates to a torsional mode magnetostrictive sensor for a metal rod with a small diameter, belonging to the technical field of electromagnetic acoustic sensors. Background technique: [0002] The current torsional mode ultrasonic guided wave magnetostrictive sensors are mostly used in some large-scale structures such as pipes and steel cables, mainly for length and defect detection, but it is difficult to excite torsional mode ultrasonic guides in metal rods with a diameter of less than 10 mm. Wave. The materials of small-diameter metal rods are also different, such as iron, copper, aluminum, nickel and various alloy materials, etc. Therefore, it is necessary to develop a magnetostrictive sensor with simple structure and easy disassembly and assembly, which can be used to excite torsional mode ultrasonic guided waves in small-diameter metal rods. Invention content: [0003] The purpose of the invention is to realize the excitation of...
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IPC IPC(8): G01N11/00G01N29/34
Inventor 吴斌高博刘秀成何存富
Owner 北京中盈盘古智能技术有限公司