Constant magnetic field detector

FIELD: measuring techniques.

SUBSTANCE: device has two magneto-electric sensors, on ends of which conductive facings are applied serving for voltage measurement. Sensors are made of multi-layer or volumetric composite material consisting of ferrite and piezoceramics with different percentage of piezoceramics volume.

EFFECT: higher sensitivity, higher efficiency.

2 dwg, 1 tbl

 

The invention relates to measuring technique and can be used to convert the magnetic field into an electrical voltage.

Known sensor based on the Hall element containing semiconductor wafer, on the four sides of which are the contacts. The maximum sensitivity of Hall sensors up to 1 mV/V, the sensitivity of the proposed magnetoelectric (me) sensor 25 mV/E.

Cm. Baranochnikov M., Micromagnetoelectronic. Volume 1 - M: DMK Press, 2001. - 554 S.

The main disadvantage of Hall sensors - design complexity, parameter dependence on temperature, a low overload capability, low radiation resistance.

The objective of the invention is to increase the sensitivity, the radiation resistance and the expansion of the range of measured magnetic fields.

This object is achieved in that the sensor constant magnetic field, containing a substrate and two magneto-sensitive element, the ends of which are covered with the conductive plates is further provided with a magnetizing coil and the magneto-sensitive elements mounted coaxially with the coil, made of multi-layered or three-dimensional composite magnetoelectric material composition of the ferrite - piezoelectric ceramics with different percentages pied is ceramiki.

For explanation of the present invention proposed drawings.

Figure 1 presents the design of a constant magnetic field sensor with two magneto-sensitive elements (DOE).

2 shows the characteristic of the constant magnetic field sensor with two magneto-sensitive elements (DOE).

Magnetoelectric (me) material is a composite ceramics composed of two components: ferrite and piezoelectric ceramics having magnetostriction and piezoelectric effect, respectively. There are mixed DOE materials consisting of a mixture of ferrite and piezoelectric material, there are also layered DOE materials, in which alternating layers of ferrite and piezoelectric.

Magneto-sensitive element (DOE) is a disk cut from the MOF material, the ends of which is coated with the conductive plates. However, the layered material layers are parallel to the plane of the disk.

The device (1) consists of two sensitive magnetoelectric (me) items 1 and 2 of the composite magnetoelectric (me) material, the ends of which are covered with the conductive plates 3. DOE elements 1 and 2 is made of laminated composite DOE material composition of the ferrite Nickel - the lead zirconate titanate with different interest the obsession of piezoelectric ceramics. On the substrate 4 placed magnetizing coil 5, coaxially on opposite sides of the substrate 4 placed me items 1 and 2. The plane of the magnetizing coil 5 and the plane of the TE elements 1 and 2 parallel to the substrate plane.

The device operates as follows. When placing the sensor in a constant magnetic field and fed to the magnetizing coil current pulse on the plates of DOE materials will have a voltage pulse proportional to the measured value of a constant magnetic field. The magnetizing coil must be in good thermal contact with the substrate, which will reduce its dimensions by passing a pulsed current of significant magnitude. Feature of the sensor constant magnetic field is the application of the second TE element located on the other side of the substrate. With this arrangement, DOE elements they are in the same condition, it is possible to assume that the magnetizing field and the measured field in these elements are the same. This sensor uses two DOE element with different content of piezoceramics 40% and 50%, respectively, with the saturation of the two sensor elements occurs at different values of the field (figure 2). The element I and element II are a multi-layered composite DOE material composition of the ferrite Nickel layer 21, CTS - layer 20 is, volumetric content of piezoceramics 40 and 50%, respectively. It is also desirable that the maximum output voltage was the same. Before applying the sensor is calibrated, while simultaneously measured the voltage on both sensor elements. About the size of the measured field can be judged by the value of the output voltage of the first and second elements.

Table 1 presents the dependence of the output voltage of the first and second sensor elements from a constant magnetic field, explaining the principle of operation of the sensor.

Each value of an external constant magnetic field has a corresponding pair of values UOUT1and UOUT2. As an example, figure 2 graphically shows the values of the fields and voltages when the voltage on one of the elements of 0.4 C. These data are summarized in table 1.

Table 1
The dependence of the output voltage of the first and second sensor elements (2). from the constant magnetic field.
Output voltageThe magnetic field strength, E.
900102026003000
UOUT1C0,350,40,50,4
UOUT2that is. 0,40,460,40,31

When carrying out measurements using the proposed sensor simultaneously measures the voltage on the element I and element II, the measured voltages are compared. The measured value of a constant magnetic field is calculated based on the output voltage of the element I, while the voltage at the element I will be less stress on the element II (curves up to the point A). If the voltage on the element I will be less stress on the element I, the magnitude of the field is calculated according to the voltage of the element II (curves after point a). The point a indicated in figure 2, corresponds to the field in which the output voltages of the two TE elements are equal.

There is a model of the sensor with the following options:

Structural and electrical parameters of the sensor constant magnetic field:

- the dimensions of the sensor - 10×10×2 (mm);

- the size of the active area is 20 mm2;

- external coil diameter - 10 mm;

- coil thickness - 1 mm;

- current coil is 0.2 A.

The maximum value of the magnetic field measured by the layout of the me sensor, amounted to 3600 uh, this limitation is due to the use of DOE material based on Nickel ferrite. When using multilayer DOE material based on cobalt ferrite range of the measured magnetic field will be increased to 10000 E.

Therefore clicks the zoom, the present invention allows to extend the range of measured magnetic fields increase the sensitivity and radiation resistance. The design of the proposed sensor is easier design of the prototype. In the manufacture of the sensor constant magnetic field applied well proven ceramic technology, which leads to its lower cost compared to the prototype.

Sensor constant magnetic field, containing a substrate and two magneto-sensitive element, the ends of which are covered with the conductive plates, characterized in that it further provided with a magnetizing coil and the magneto-sensitive elements mounted coaxially with the coil, made of multi-layered or three-dimensional composite magnetoelectric material composition of the ferrite - piezoelectric ceramics with different percentages of piezoelectric ceramics.



 

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FIELD: measuring techniques.

SUBSTANCE: device has two magneto-electric sensors, on ends of which conductive facings are applied serving for voltage measurement. Sensors are made of multi-layer or volumetric composite material consisting of ferrite and piezoceramics with different percentage of piezoceramics volume.

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2 dwg, 1 tbl

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