CN212410838U - Transient magnetic field probe structure with shielding and anti-interference functions - Google Patents
Transient magnetic field probe structure with shielding and anti-interference functions Download PDFInfo
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- CN212410838U CN212410838U CN202020750106.4U CN202020750106U CN212410838U CN 212410838 U CN212410838 U CN 212410838U CN 202020750106 U CN202020750106 U CN 202020750106U CN 212410838 U CN212410838 U CN 212410838U
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Abstract
The invention relates to the technical field of magnetic field measurement, in particular to a transient magnetic field probe structure with shielding and anti-interference functions, which comprises a detection coil, a signal processing circuit and an oscilloscope connected with a BNC connector, wherein the detection coil, the signal processing circuit and a power supply circuit are connected through a shielding cable; the invention solves the problem that the probe structure in the prior art has weaker shielding and anti-interference capability, the devices of the probe structure are connected through a shielding cable, the circuit module box adopts a metal shell, the shielding layer is ensured to be fully covered, the shielding and anti-interference effect is realized, and the effect of expanding the range is realized by arranging 1-time and 10-time switches.
Description
Technical Field
The invention relates to the technical field of magnetic field measurement, which is used for measuring transient magnetic field voltage waveform, in particular to a transient magnetic field probe structure with shielding and anti-interference functions.
Background
Transient magnetic fields are neither static nor harmonic but rather are changes in magnetic field caused by irregular changes in voltage, current or applied field over time.
The application field of the transient magnetic field measurement is mainly magnetizing, demagnetizing machine, hard disk demagnetizer, scientific research and medical pulse magnetic field generator, etc. in the industrial field.
In the prior art, a Hall sensor is usually adopted as a magnetic field probe for measurement, but the Hall sensor has the defects of saturation, high-precision low-temperature-drift constant current source and very complex circuit; and the shielding and anti-interference capability of the existing probe is weaker.
Disclosure of Invention
To the problem that exists among the prior art, this application has proposed a transient magnetic field probe structure with shielding anti-interference function, connects through shielded cable between the device of this probe structure, and circuit module box adopts metal casing, guarantees shielding layer full coverage, has realized shielding anti-interference effect, and 1 time and 10 times switch that set up simultaneously have realized the effect of enlarged range.
In order to achieve the purpose, the invention provides a transient magnetic field probe structure with shielding and anti-interference functions, which comprises a detection coil, a signal processing circuit and an oscilloscope connected with a BNC connector, wherein the detection coil, the signal processing circuit and the oscilloscope are connected through a shielding cable, the signal processing circuit and a power supply circuit are connected in a circuit module box, and the circuit module box is a metal shell.
It should be noted that: the signal processing circuit comprises a differential amplifying circuit, a high-frequency filter circuit, an integrating circuit, a proportion adjusting circuit and a power supply circuit for supplying power, wherein the differential amplifying circuit, the high-frequency filter circuit, the integrating circuit and the proportion adjusting circuit are sequentially communicated.
The working principle and the process of the technical scheme are as follows: when the device is used, the power supply circuit is started, the change of a magnetic field in an environment is detected through the detection coil, the detection coil senses the change of a sine wave in a detection magnetic field in a coupling mode, a detection signal is generated according to the changed detection magnetic field, then the detection signal is transmitted to the signal processing circuit, a direct current signal is effectively amplified through a differential amplification circuit in the signal processing circuit, and meanwhile, the differential amplification circuit can reduce zero drift caused by power supply fluctuation and the change of a transistor along with temperature; the signal processed by the high-frequency filter circuit is transmitted to an integrating circuit, the received signal is processed by the integrating circuit, the processed signal is transmitted to a proportional adjusting circuit, different amplification factors are set by the proportional adjusting circuit, and the measuring range is widened.
Compared with the traditional transient magnetic field probe structure, the transient magnetic field probe structure in the application has the advantages that the coil is adopted for probe measurement, the circuit is simplified while saturation is avoided, the devices of the system are connected through the shielding cable, the circuit module box is provided with the metal shell, the shielding layer is ensured to be fully covered, and the excellent shielding and anti-interference effect is realized.
It should be noted that, the power supply circuit includes a button cell, and the power supply circuit is set in the form of a button cell, so that the production cost is reduced, the power supply circuit can be conveniently replaced, the replacement is convenient, the cleanness of the battery can be ensured, and the signal is prevented from being polluted by an external power supply, thereby ensuring the quality of the acquired signal, and the button cell has small volume, is convenient to be matched with an instrument, and is also convenient to carry; the voltage of the button cell is processed to be +/-12V, the voltage range of 12V can enable the range of the collected signals to be wider, and the anti-interference capability is strong.
Furthermore, the detection coil is of a double-layer winding structure.
Further, the shielding cable is a 50 Ω rf baseband cable. This application adopts 50 omega radio frequency baseband cable, makes whole circuit structure's shielding anti-interference effect better.
Furthermore, the output circuit and the input circuit of the circuit module box both adopt SMA radio frequency signal connectors.
Further, 1 time and 10 times of change-over switches are connected to the circuit module box. This application has realized the effect of expanding the range through setting up 1 time and 10 times switch on circuit module box. Wherein 1X represents 1-fold and 10X represents 10-fold.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the transient magnetic field probe structure in the application adopts the coil as the probe for measurement, thereby avoiding saturation and simplifying the circuit, and the devices of the system are connected through the shielding cable, thereby ensuring the full coverage of the shielding layer and realizing the shielding and anti-interference effects;
(2) according to the method, the 50 omega radio frequency baseband cable is adopted, so that the shielding anti-interference effect of the whole circuit structure is better;
(3) this application has realized the effect of expanding the range through setting up 1 time and 10 times switch on circuit module box.
Drawings
Fig. 1 is a schematic structural diagram of a transient magnetic field probe structure with shielding and anti-interference functions according to the present invention.
Reference numerals: 1-detection coil, 2-shielding cable, 3-circuit module box and 4-BNC connector.
Detailed Description
All features disclosed in this specification may be combined in any combination, except features and/or steps that are mutually exclusive.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention is further described in detail with reference to fig. 1 and the specific embodiments.
Example 1
Referring to fig. 1, the transient magnetic field probe structure with shielding and anti-interference functions provided by the invention comprises a detection coil 1, a signal processing circuit and an oscilloscope connected with a BNC connector 4 through a shielding cable 2, wherein the signal processing circuit and a power supply circuit are connected in a circuit module box 3, and the circuit module box 3 is a metal shell.
It should be noted that: the signal processing circuit comprises a differential amplifying circuit, a high-frequency filter circuit, an integrating circuit, a proportion adjusting circuit and a power supply circuit for supplying power, wherein the differential amplifying circuit, the high-frequency filter circuit, the integrating circuit and the proportion adjusting circuit are sequentially communicated.
The working principle and the process of the technical scheme are as follows: when the device is used, the power supply circuit is started, the detection coil 1 detects the change of a magnetic field in the environment, the detection coil 1 senses the change of a sine wave in a detection magnetic field in a coupling mode, generates a detection signal according to the changed detection magnetic field, then transmits the detection signal to the signal processing circuit, firstly, the direct current signal is effectively amplified through the differential amplification circuit in the signal processing circuit, and meanwhile, the differential amplification circuit can also reduce zero drift caused by power supply fluctuation and the change of a transistor along with temperature; the signal processed by the high-frequency filter circuit is transmitted to an integrating circuit, the received signal is processed by the integrating circuit, the processed signal is transmitted to a proportional adjusting circuit, different amplification factors are set by the proportional adjusting circuit, and the measuring range is widened.
Compare with traditional transient magnetic field probe structure, the transient magnetic field probe structure in this application has still simplified the circuit when having avoided saturation through adopting coil 1 as the probe measurement, connects through shielded cable 2 between the device of this system moreover, and circuit module box 3 adopts metal casing, guarantees the shielding layer and covers entirely, has realized the anti-jamming effect of excellent shielding.
It should be noted that, the power supply circuit includes a button cell, and the power supply circuit is set in the form of a button cell, so that the production cost is reduced, the power supply circuit can be conveniently replaced, the replacement is convenient, the cleanness of the battery can be ensured, and the signal is prevented from being polluted by an external power supply, thereby ensuring the quality of the acquired signal, and the button cell has small volume, is convenient to be matched with an instrument, and is also convenient to carry; the voltage of the button cell is processed to be +/-12V, the voltage range of 12V can enable the range of the collected signals to be wider, and the anti-interference capability is strong.
Example 2
Referring to fig. 1, a detection coil 1 of this embodiment is a double-layer wound structure according to embodiment 1.
Example 3
Based on embodiment 1, referring to fig. 1, the shielded cable 2 of this embodiment is a 50 Ω rf baseband cable.
This application adopts 50 omega radio frequency baseband cable, makes whole circuit structure's shielding anti-interference effect better.
Example 4
Based on embodiment 1, referring to fig. 1, the output circuit and the input circuit of the circuit module box 3 of this embodiment both use SMA radio frequency signal connectors.
Example 5
Referring to fig. 1, a circuit module case 3 according to embodiment 1 is connected to 1X and 10X switches.
The effect of expanding the range is achieved by arranging the 1X and 10X switches on the circuit module box 3. Wherein 1X represents 1-fold and 10X represents 10-fold.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (5)
1. The transient magnetic field probe structure with the shielding and anti-interference functions comprises a detection coil (1), a signal processing circuit and an oscilloscope which are connected through a shielding cable (2), wherein the oscilloscope is connected through a BNC connector (4), and is characterized in that the signal processing circuit and a power supply circuit are connected in a circuit module box (3), and the circuit module box (3) is a metal shell.
2. The structure of the transient magnetic field probe with shielding and anti-interference functions as claimed in claim 1, wherein the shielded cable (2) is a 50 Ω rf baseband cable.
3. The structure of the transient magnetic field probe with shielding and anti-interference functions as claimed in claim 1, wherein the detection coil (1) is a double-layer wound structure.
4. The structure of the transient magnetic field probe with shielding and anti-interference functions as claimed in claim 1, wherein the output circuit and the input circuit of the circuit module box (3) both adopt SMA radio frequency signal connectors.
5. The structure of the transient magnetic field probe with shielding and anti-interference functions as claimed in claim 1, wherein 1X and 10X switches are connected to the circuit module box (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020750106.4U CN212410838U (en) | 2020-05-08 | 2020-05-08 | Transient magnetic field probe structure with shielding and anti-interference functions |
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| CN202020750106.4U CN212410838U (en) | 2020-05-08 | 2020-05-08 | Transient magnetic field probe structure with shielding and anti-interference functions |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116520137A (en) * | 2023-06-27 | 2023-08-01 | 北京智芯微电子科技有限公司 | Low-noise chip pin interference measurement auxiliary device and measurement system |
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2020
- 2020-05-08 CN CN202020750106.4U patent/CN212410838U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116520137A (en) * | 2023-06-27 | 2023-08-01 | 北京智芯微电子科技有限公司 | Low-noise chip pin interference measurement auxiliary device and measurement system |
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