RU122181U1 - DEVICE FOR TESTING MAGNETOMETERS - Google Patents

Abstract

A device for checking magnetometers, containing a source of pulsed signals made in the form of a U-shaped electromagnet, characterized in that the device is supplemented with a frame with two concentrators in the form of plates made of ferromagnetic steel and paired plates made of non-magnetic material, arranged with their wide surfaces sequentially one by one in one plane so that the concentrators are in the pole-to-pole gap of the electromagnet.

Description

The utility model relates to non-destructive testing of product quality, namely to electromagnetic control, and can be applied in various branches of engineering.

A known device for checking magnetometers (Flaw detector magnetometer MF-23IM, Operation manual Иа2.778.006РЭ), consisting of a magnetic field coil, latra, control unit and voltmeter. This device allows you to very accurately obtain electromagnetic fields in sufficiently large ranges. The disadvantage of this device is the inability to obtain pulsed magnetic fields.

A device for checking magnetometers is known (Flaw detector magnetometer MF-23IM, Operation manual Иа2.778.006РЭ), consisting of a coil of a pulsed magnetic field KIP-1 and a pulse current source. As a source of pulsed current, the electronic unit of the magnetizing device UNM-300/2000 is used.

The disadvantage of this device is a very narrow range of verified values when measuring in pulsed fields of modern magnetometers ..

The closest technical solution to the claimed one is a device for checking magnetometers (Application for utility model No.201138777 dated 09/21/2011), containing a pulse signal source, made in the form of a U-shaped electromagnet, supplemented by a U-shaped guide mounted vertically at the poles above an electromagnet, a holder with a longitudinal through hole installed above the poles of an electromagnet in a U-shaped guide, and measuring plates of non-magnetic material. This device allows you to verify magnetometers in the entire measurement range up to 70 A / cm. But for testing modern magnetometers with measuring ranges up to 700 A / cm, the bottom device is not suitable. This is because the highest value of the magnetic field strength (up to 70 A / cm) obtained using the known device is limited by the electromagnetic and geometric characteristics of the U-shaped electromagnet.

The proposed utility model completely solves the problem of checking magnetometers in the entire measurement range in pulsed fields of modern magnetometers.

To achieve a technical result, the device for checking magnetometers is supplemented with a frame with two concentrators in the form of plates of ferromagnetic steel and paired plates of non-magnetic material.

The features that distinguish the proposed device for checking magnetometers allow them to be verified over the entire range of their measurements.

The proposed device for checking magnetometers is illustrated by the drawings presented in figure 1 and figure 2:

figure 1 shows a device for checking magnetometers, supplemented by a frame 1 with two concentrators 2 in the form of plates of ferromagnetic steel and measuring plates 3 of non-magnetic material;

figure 2 shows the frame 1 of the device for checking magnetometers.

A device for checking magnetometers contains a U-shaped electromagnet with protruding poles, supplemented by a frame 1 with two concentrators 2 in the form of plates of ferromagnetic steel and pair plates 3 of non-magnetic material, arranged with their wide surfaces sequentially one after another in the same plane so that the plates of ferromagnetic steel were in the interpolar gap of the electromagnet.

Figure 1 shows the assembled frame 1, two hubs 2 in the form of plates of ferromagnetic steel (highlighted by oblique hatching), two pairs of plates 3 of non-magnetic material (highlighted by direct horizontal hatching) and the transducer 4 of the verified magnetometer. Each pair of non-magnetic plates has the same dimensions. This allows for sequential laying of the plates in the same plane as shown in figure 2, to ensure a symmetrical arrangement of the plates 2 relative to the center in the interpolar gap of the electromagnet, which is necessary when repeatedly reproducing the same magnitude of the magnetic field in the gap between the plates 2, as well as obtaining and comparing with each other various values of the magnetic field in the entire range of measurements of the magnetometer.

Frame 1 has two windows B. The dimensions of frame 1 and concentrates 2 are selected taking into account the sizes of the poles of the electromagnet - the source of pulsed fields. The length and width of the windows B of the frame 1 is equal to the width and thickness of the poles of the electromagnet, respectively. The distance between the windows B of the frame 1 is equal to the distance P between the poles of the electromagnet.

The minimum value of the intensity of the pulsed field is obtained when placed between the poles of the electromagnet of the Hall sensor 5 (figure 1), located at the end of the probe 4, located between two plates 3 of length P each. Concentrators 2 are not used.

The greatest magnitude of the magnetic field strength is obtained when the Hall sensor is located between the plates 2 located at the poles of the electromagnet. When this plate 2 is shifted to a minimum distance T to each other. This distance is determined by the thickness of the probe at the location of the Hall sensor.

For intermediate values between the minimum and maximum values of the magnetic field strength is determined by the size t of non-magnetic plates 3 of each pair (figure 2). Thus, the total distance T between the magnetic plates 2 for each specific value of the magnetic field is determined by the size t of the pair of non-magnetic plates selected for it and the thickness of the probe at the location of the Hall sensor.

The rectangular groove in the frame 1, through which the probe 4 is installed in the central part of the frame 1 between the poles of the electromagnet, is characterized by dimensions f and h. The size h is chosen so that it is possible to position the probe in the same plane with the ferromagnetic plates 2. The width of the rectangular groove f is chosen so as not to limit the possible displacement of the probe 4 relative to the center between the poles of the electromagnet. This need arises when the probe 4 is installed between the plates and when they are tightly compressed with each other using a screw 6, which leads to a significant displacement of the probe 4 from the middle part between the poles of the electromagnet.

Verification of magnetometers using the proposed device is carried out in the following sequence.

Make:

- two plates of ferromagnetic steel, the length of each of which is equal to the interpolar distance of the electromagnet;

- several sets of plates of non-magnetic material. Each set consists of two pairs of plates to provide a given distance between the plates 2, in order to obtain a magnetic field of a certain magnitude. The number of sets should be 9 ÷ 11 and the values of the obtained magnetic field values should be evenly distributed over the entire measurement range of the magnetometer being verified.

Next, an exemplary magnetometer, an exemplary electromagnet are selected, which, together with the manufactured complete set of plates 2 and 3, are sent to the organization of the metrological service, where it is possible to reproduce magnetic fields in the measurement range of the magnetometer. Using plates 2, sets of non-magnetic plates 3, probe 4 of the transducer connected to the magnetometer to be verified, assembled integrally in frame 1 (Fig. 1) and mounted accordingly on the poles of the electromagnet, the inclusion of which reproduces a number of magnetometer readings, each of which is compared with measurements made by the verified magnetometer of the magnetic field at the installation of the metrological service. A verification certificate is compiled, where each combination of plates 2, 3 with serial numbers and probe 4 of the transducer of the exemplary magnetometer is compared with the magnetic field values of the exemplary installation of the metrological service.

Using an exemplary electromagnet, known by the certificate of verification of the properties of plates 2 and 3, the magnetometer is calibrated - a working measurement tool.

Claims (1)

A device for checking magnetometers, containing a source of pulsed signals made in the form of a U-shaped electromagnet, characterized in that the device is supplemented by a frame with two concentrators in the form of plates of ferromagnetic steel and paired plates of non-magnetic material located one after the other with their wide surfaces in series one plane so that the concentrators are in the interpolar gap of the electromagnet.