CN201166698Y - Pulse strong magnetic field measurement detector - Google Patents

Abstract

A pulsed strong magnetic field measuring detector is characterized in that it includes a detection coil support, a detection coil and an outer protective cover, the detection coil is wound on the groove of the detection coil support, and then sealed in the outer protective cover, and the detection coil is a single layer Pick-up field detection coil, the wire diameter of its copper wire is 0.01-0.5mm. It can accurately measure the pulsed magnetic field with a magnetic field strength up to 100T. It is easy to operate, simple in structure and safe and reliable.

Description

Pulse strong magnetic field measurement detector

technical field

The utility model is a sensor for accurately detecting the magnetic field intensity at each point under the condition of a strong pulsed magnetic field.

Background technique

At present, the measurement method of magnetic field strength is mainly the electromagnetic induction method. Under the steady-state magnetic field, the vibration of the coil cuts the magnetic induction line to generate an induced voltage; or the magnetic field strength is measured by methods such as Hall and nuclear magnetic resonance. According to the characteristics of pulsed strong magnetic fields and pulsed magnets (large magnetic field change rate and high magnetic field strength), the general steady-state measurement method cannot correctly measure the intensity and distribution of pulsed magnetic fields, so it is necessary to develop a magnetic field detection sensor suitable for pulsed strong magnetic fields.

Contents of the invention

The purpose of this utility model is to provide a pulsed strong magnetic field measuring detector suitable for pulsed field conditions according to the structural characteristics of the pulsed strong magnet, and the detector can accurately measure the magnetic field with high magnetic field strength and high rate of change.

The technical solution adopted by the utility model to solve the technical problem is: a pulsed strong magnetic field measuring detector, which is characterized in that it includes a detection coil support, a detection coil and an outer protective cover, and the detection coil is wound on the groove of the detection coil support Then sealed in the outer protective sheath, the detection coil is a single-layer pick-up field detection coil, and the diameter of its copper wire is 0.01-0.5mm.

The principle of the utility model is: the pick-up field coil method, also known as the electromagnetic induction method. That is, by analyzing the induced voltage signal generated in the pick-up field coil, the magnitude of the measured magnetic field strength can be known.

According to Faraday's law of electromagnetic induction, the pick-up field detection coil is placed in a pulsed magnetic field that changes with time, and the induced voltage generated in it is: $\mathrm{Ui}\left(t\right)=-S\frac{\mathrm{dB}}{\mathrm{dt}}---\left(1\right)$

In the above formula, S is the effective area of the pick-up field detection coil. If the number of turns of the detection coil is N and the cross-sectional area is A, when its axis is parallel to the magnetic field, there is

S＝NA+Sa (2)

Among them, Sa is the area caused by wires and wire connections (except for pick-up field detection coils). If it is wound as a single-layer pick-up field detection coil, and the diameter of the copper wire used is small, Sa can be ignored, then S=NA.

If let τ be the time taken for the pulsed strong magnetic field to reach the peak value B (record the starting point of the pulse as time zero), then we have

$\mathrm{<span\; class="notranslate">\; B</span>}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span>\frac{{<span\; class="notranslate">\; \&Integral;</span>}_{\mathrm{<span\; class="notranslate">\; 0</span>}}^{\mathrm{<span\; class="notranslate">\; \&tau;</span>}}\mathrm{<span\; class="notranslate">\; Ui</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; dt</span>}}{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

It can be seen that, by reasonably and accurately calibrating the effective area of the field detection coil (by standard magnets), the measured magnetic field strength can be obtained by integrating the induced voltage.

The beneficial effect of the utility model is that the pulse magnetic field with a magnetic field strength up to 100T can be accurately measured, and the operation is convenient, the structure is simple, and it is safe and reliable.

Description of drawings

Fig. 1 is a schematic structural diagram of a pulsed strong magnetic field measuring detector according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of the structure of the detection coil support in Fig. 1 .

Fig. 3 is a schematic diagram of the position of the detection coil in Fig. 1 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Explanation of marks in Figure 1: 1-detection coil; 2-detection coil support; 3-outer protective cover; 4-signal lead wire.

Referring to Fig. 1, the pulsed strong magnetic field measuring detector of the utility model embodiment, it comprises detection coil support 2, detection coil 1 and outer protective cover 3, detection coil 2 is wound on the groove of detection coil support 1, is sealed in the outside then In the protective cover 3, the detection coil 2 is a single-layer pick-up field detection coil, and the diameter of the copper wire is 0.05 mm, 0.2 mm, or 0.5 mm.

Referring to FIG. 2 , a detection coil support 2 is processed by non-magnetic material, and the size of the detection coil support 2 can be adjusted according to characteristics such as magnetic field measurement range and strength.

Install and fix the detection coil 1 according to the position of the detection coil in Fig. 3, and then seal it according to Fig. 1 .

Place the installed and debugged detector in the magnetic field to be tested, measure the signal voltage, and then get the magnetic field size of the point to be tested according to the integral relation (3).

Advantage and positive effect of the present utility model are:

1) It can accurately measure the pulsed magnetic field with a magnetic field strength up to 100T;

²⁾ Simple structure and safe and reliable;

3) Easy to operate.

Claims (1)

1, a kind of impulse magnetic field is measured detector; it is characterized in that: it comprises detecting coil support, detecting coil and outer jointing jacket; detecting coil is on the groove of detecting coil support; be sealed in the outer jointing jacket then; detecting coil is an individual layer pick-up field detecting coil, the line footpath 0.01-0.5mm of its copper cash.

Images