CN2603944Y

CN2603944Y - Magnetic induction sensor

Info

Publication number: CN2603944Y
Application number: CN 03211670
Authority: CN
Inventors: 王晓阳
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-03-05
Filing date: 2003-03-05
Publication date: 2004-02-18
Anticipated expiration: 2013-03-05

Abstract

The utility model relates to a device which can indicate the magnetic field intensity or whether the magnetic field exists or not, in particular to identify weak magnetic field including geomagnetic field and to indicate the directions of magnetic field as a magnetic induction sensor. The utility model is mainly consisting of a casing, a coil, a skeleton and a magnetic core, etc. The coil enwinded by enameled wire is provided in the metal casing. The coil is enwinded on the cavity insulation skeleton and joints are arranged on both ends of the enameled wire. The magnetic core made from the magneto impedance materials is provided in the cavity of skeleton. The guiding holes are opened in the metal casing where the axis of the coil gets through. The magnetic induction sensor can not only detect weak magnetic field which is 0.001GS, but also indicate right direction. Because the utility model can make an oscillating work mode with the circuit, post-processing circuit becomes very simple and the interface with the computer also becomes very easy.

Description

Magnetic induction sensor

(1) technical field: the utility model relates to a kind of device of indicating magnetic field intensity or magnetic field whether to exist, and particularly can discern low-intensity magnetic field such as magnetic field of the earth and can indicate the magnetic induction sensor of magnetic direction.

(2) background technology: known magnetic field sensor mostly is made of mistor, magnetodiode, magnetic sensitive transistor and Hall element, there is technological deficiency separately in its element: the existence that Hall element can only the above high-intensity magnetic field of perception 0.5GS, and to low-intensity magnetic field perception such as magnetic field of the earth less than; The critical point of magnetodiode, magnetic sensitive transistor sensitivity is on 0.5GS, and when the working point was selected in critical point, its work was extremely unsettled, moreover the non-constant of its consistance, brought a lot of troubles to post processing circuitry, thereby has lost the practical value that detects magnetic field; Mistor can detect the existence of low-intensity magnetic field, but high to the post processing circuitry requirement, thereby increases detection difficulty and cost.Its resolution is low in addition, very easily is subjected to external interference, and where can not differentiate is the magnetic field that will detect.Because each element has shortcoming separately, the sensor magnetic field intensity of formation has just lost practical value when 0.5GS is following, exist the directivity defect of bad simultaneously.

(3) summary of the invention: for overcoming the above-mentioned technological deficiency of existing magnetic field sensor, the utility model aims to provide and a kind ofly can detect the 0.001GS low-intensity magnetic field, and the extraordinary magnetic induction sensor of directivity, the technical scheme that is adopted is: a coil with the enameled wire coiling is housed in a metal shell, its coil is on the insulation framework of cavity, and the two ends of enameled wire are provided with joint.The magnetic core that one magnetoimpedance material is made is housed in the cavity of skeleton.On the metal shell that the coil axis direction is passed, have pilot hole.This magnetic induction sensor cooperates oscillatory circuit can detect low-intensity magnetic field: parallel with coil axis and when changing, the magnetic line of force is responded on magnetic core by pilot hole, the magnetic core magnetoimpedance is changed, i.e. magnetic flux change when the external magnetic field direction.As everyone knows, inductance value also changes during magnetic flux change, thereby the oscillation frequency of whole oscillatory circuit is changed, and the difference of its change frequency has been represented the variable quantity of magnetic field intensity.The magnetic field of other direction is masked by metal shell, and waveform can be directly after shaping and computer interface.Also available 1-3 vertical mutually installation of this magnetic induction sensor, and form oscillator, can detect the magnetic field situation of different directions, and compensation mutually, can become easier by Computer Processing again.The utility model not only reaches the purpose that detects low-intensity magnetic field, and maskable falls the disturbing magnetic field of other direction, reaches the effect of high directivity.

(4) description of drawings: Fig. 1 is a vertical section structure synoptic diagram of the present utility model; Fig. 2 is the electrical schematic diagram of Fig. 1.

(5) embodiment:, further set forth the utility model specific embodiment below in conjunction with accompanying drawing.As seen from Figure 1, Figure 2, the utility model mainly is made of shell 1, coil 2, skeleton 3, magnetic core 4 etc., and a coil 2 that turns to enameled wire is housed in metal shell 1, and coil 2 is on cavity insulation framework 3, and the two ends of enameled wire are provided with joint 6.The magnetic core 4 that one magnetoimpedance material is made is housed in the cavity of skeleton 3.On the metal shell 1 that coil 2 axis directions pass, have pilot hole 5.

Claims

1, a kind of magnetic induction sensor is mainly by shell (1), coil (2), skeleton (3) and magnetic core formations such as (4), it is characterized in that in metal shell (1), being equipped with a coil (2) with the enameled wire coiled, coil (2) is on cavity insulation framework (3), the two ends of enameled wire are provided with joint (6), the magnetic core (4) that one magnetoimpedance material is made is housed in the cavity of skeleton (3), on the metal shell (1) that coil (2) axis direction passes, has pilot hole (5).