JPS6058564A - Magnetic field measuring apparatus - Google Patents

Abstract

PURPOSE:To simplify operation while making it possible to perform high accuracy measurement, by a method wherein magnetic elements are arranged in three directions mutually crossing at right angles and at least two coils are arranged to the periphery of three magnetic elements while a predetermined electric signal is applied to one of two coils and the intensity of a magnetic field and the direction of magnetic flux are measured. CONSTITUTION:Coils in an x-axis direction, that is, a detection coil 13 and a detection bias coil 15 are selected by a microprocessor 49 and currents each changed in an absolute value and polarity are successively inputted to the detection bias coil 15 from a D-A converter 48. On the other hand, a signal having frequency same to the specific frequency of a signal generator 46, that is, a detection signal is taken out from the output of the detection coil 13 and compared with a ''0'' level by a comparator 45. When geomagnetism is eliminated and the detection signal comes to the ''0'' level, a pulse signal is outputted to the microprocessor 49 from the comparator 45 and the value and polarity of the current flowed to the detection bias coil 15 at this time are stored. Similar operation is performed with regard to a y-axis and a z-axis.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention can be carried out in 14 quick steps.
It concerns the magnetic field IAIJ fixed table where iZ is possible.

Conventionally used magnetic field measuring devices measure magnetic sensitivity values, proton 11B force meters, fluxgate force meters, etc., but magnetic field measurement devices require multiple measurements to eliminate various errors. 1. flζ Proton magnetometer C7i requires a considerable force for excitation, but in completely continuous measurement ii Kana (dru/I can't believe this anymore, and it's still fufutsukusuguto 1)
In the case of 1i4 sword 61, it is necessary to cancel the average horizontal 5 and vertical component force by applying it to the V gap that defines the horizontal and vertical component forces and flowing it through the τ compensation coil, but it is necessary to cancel the average horizontal 5 and vertical component forces. The drawbacks of this method are that it is difficult to maintain it in a treetop within a temperature range of 10°C (γ), that it is difficult to handle it with high accuracy and that it is difficult to measure it with high precision. , - magnetic elements are all arranged 30,000 times orthogonal to each other, and at least 2 magnetic elements are arranged around each of the three magnetic elements.
By arranging two coils θ, one of the two coils θ, and a predetermined tonkigogo, the magnetic field strength in that direction is determined from the detection signal from the kamekigogo and the other coil. The direction of the flux is measured, and the strength and direction of the external magnetic field are measured from the m11 constant results in the three directions mentioned above. The objective is to realize a magnetic field measurement surface that can be used without any need. One drawing will be explained in detail below.

First, the basic principle of the magnetic field projection device of the present invention is explained in Figures 11 and 2.
The diagram will be explained. In the diagram, 1! /'i Magnetic element 1 whose magnetic properties change due to changes in external magnetic elevation For example, IJ yyn of amorphous agglomerate, 21ri predetermined intersection v'+L 4
An excitation coil that applies mL, an imaging coil that generates a 3-striped detection signal τ, an excitation bias coil that applies a magnetic bias γ to the 4'ri excitation coil 2, and a detection bias coil that applies a magnetic bias magnetic field to the 5-digit excitation coil 3.

The ribbon 17 is bent at a substantially right angle near the center thereof, and the first side 1a thereof is arranged substantially vertically, and the other side 11)) is arranged in the direction A of the magnetic field to be detected. On the other hand, an excitation coil 2 and an excitation noise coil 4 are disposed around the side 1a, and a detection coil and a detection bias coil 5 are disposed around the other side 1b. A constant 4 DC current is applied to the upper self-excitation bias coil 4, Jt, and the excitation coil 2 is magnetically biased. (Set at the point where 10 is the maximum.

When the input acid current tv of the specific frequency shown in FIG. Frequency signals are also generated, but we will not consider them here.)
Occur.

By the way, the current density of the output current 7 differs depending on the direction of the magnetic flux and the direction of the magnetic flux existing in the direction of the other side 1b of the bong 1 from the current.

If we think carefully about the magnetic field that exists here,
The other side of ribbon 1, 1b, c) The lifting platform, which is on the same north side, has the largest magnetic field strength, so it shows the strongest magnetic field. Next, when one side 1af is centered and the other side 1h is rotated to face the bundle, the strength of the magnetic field weakens, so the first flow 1lkl
becomes smaller (output tun υij 7'), and becomes °゛0'' east of -ra.If you turn V further from there and turn it even slightly, the direction of the magnetic field will reverse, so it will be 1 phase. is 180
The output current changes to 77'), the strength of the magnetic field increases as it approaches the south, and the current value becomes sharper at 7' (output 77').
57″/).

On the other hand, when one current is passed through the j-extrusion bias coil 5, the distance is 1 m.
-A bias magnetic field is generated in the direction of side b.

By sequentially changing the magnitude and polarity of the flow, we can see that the magnetic field of the magnetic field and the undulation of the current are C (the output of the volcanic coil 3 is
A platform with a value of 0 is generated. Therefore.

At this time, from the value and polarity of the current υim applied to the dj bias coil 5, it is possible to determine whether the direction AV) fm field is the same as the flux.

Figures 3 to 6+A show one example of the 1D field extraction device of the present invention. 13,23.33μ detection coil.

14.24.34Vi excitation bias coil, 15125
．． 35 is a detection bias coil, 40, 41 is a multiplexer, 43μ synchronous detector, 44)-j: low noise filter (LPF), 45 is a connomitor, 46 is a signal generator, 47 is a 1+M bias for excitation a 48-digit D-A converter, and a 49-digit microprocessor.

One side 1ia of the ribbon 11, 21.31.

21a, 31alC1'' to excitation coil 121221:3
2 and excitation bias coil l 4 , 24 , 34zz
；So/'L I've added time to that, and the other side 11b, 2
1L+.

31M, the detection coil 13, 2: ring, 3: 3 and the sales noise coil 15, 25.35 are defeated. Also, the other side 1 l b + 21 b 2. '
(11) are directly fired in the x, z axis directions.
It is placed facing L and is at tL.

The signal generator 4 is connected to the excitation coils 12, 22, :32.
Due to the specific frequency - the redundant signal is supplied tL, - and the excitation th = bias coils 14, 24, 34.
The ribbon 11.21.3iμ is kept in good resonance condition.

We will briefly explain the motion 1', or here we will describe the case where the two axes are arranged vertically and the total magnetic force and inclination angle of the earth's magnetism are defined.

, l: J' The microprocessor 49 selects the coils in the X-axis direction, that is, the detection coil 13 and (moxibustion bias coil 15) rL,
])-Ia currents having the same absolute value and polarity are sequentially inputted to the detection bias coil 15 from the A voltage regulator 48.

-- method (from the output from the Eide coil 13, the Hiteo amplifier 4
2. Synchronous W$g, j 43 & Hironosu filter 4
Click 4 to generate information 446'4'! A 1g signal, a video signal, with the same frequency as the f-bore frequency was released.

Contrast 9v-45 with ``0'' level.

When the earth's magnetism disappears from the bias magnetic field generated by the detection bias coil 15 and the detection signal becomes 0, pulse No. 16 is output from the comparator 45 to the microphone processor 49, and the detection bias coil at this time 1
The value and polarity of tun JAL flowing to 5 are stored. Below, y
Regarding the axis and the Z-axis, the value and inertia of the direct current flowing through the detection air filter 25.35 when the detection signal becomes "O" are similarly recorded in the micrometer cell 49.

Next f/ko minoro processor 49 top, if X+y+2
From the current values stored in each axial direction, the strength of the magnetic field in the x + ytza direction is determined based on the predetermined conversion factor.

Performance in each y + zilall direction ■Put the same.

Then, the direction (inclination) of the earth's magnetic field is calculated from the direction of the strong flux of V-rise for each rotation of the X * Y + Z axis direction (inclination angle) using the calculation shown above. That is, in FIG. 6, the horizontal component II d, the magnetic field strength in the X-axis direction and the X-axis direction are iL, X, Y, and t'L4, respectively.

H=p...(1). Also, the odor intensity, that is, the total low force 1.゛, is the same in the two axes as the -y-to-strength tZ and j-i.

1' -5 "F... (2) and/I? life.t
The angle of inclination of the total low force 1i1 with respect to the water +- component force 11 1)
Well, 1 = tan-' Z/11 ・= ・(31. By correcting the yaw and declination, it is also possible to determine the true north direction. Also, by repeating the above delimitation and calculation calculations multiple times, SoV
It may be possible to charge an average of 11 minutes.

FIG. 7 shows another embodiment of the present investigation. In the figure, 50, 51, 52 are ribbons of amorphous base metal, 53
, 54, 55, 56, 57゜58 are coiled, and the Kamikawa ribbon 50, 51゜52 is bent at a right angle near the center ffL.

-sides 50a, 51a, 52a
y l z rXIJllI In the + direction, the other side 50b
, 51b, and 52bld are arranged facing V in the direction of the x+y+Z axis.

tycko□I le53 + 56'td') con5
The VC is arranged around the other side 50b of 0 and the ribbon 52, and the other side 51b is 54 + 57 'r'i.
and around the circumference of one side 50a, and the coil 55.58 is around the other side 5
2b and around one side 51a.

In the above configuration, the Kande coil, the detection bias coil,
As an excitation coil, l1lj/I vibration bias coil,
One increase in the axial direction t it'l1 plus 7-1, coil 5
Select from 3, 56, 54, or 57.

In the case of the y-axis, coils 54, 57, +i5.5
8 selects t' respectively Jt, in the case of tang 7 two axes, coil 55, 58, 53, 56 selects tL 5 tl, selection q
Do it at tL. 1. - The number of coils can be reduced to half compared to the above-mentioned actual BM 17U, and the configuration can be further simplified.

In addition, regarding the electric circuit part Vζ, there is a signal generator 46 and a signal generator 46 for the driver 11 as well as an electric current source 4 for the driver 4.
It is sufficient to add a multi-blenometer τ to selectively apply the output of 7 to each coil 53 to 58 (f/).

In the explanation so far, the strength of the earth-ki υ1 riho niri is not limited to 9, but also the strength of the norayuro 11 light world.

As explained above, measuring the direction has the same effect as the actual investigation.

(i) Since it consists of a magnetic field part with no auxiliary parts and an electric circuit part that does not require any adjustment,
4 (-1) Accurate measurement without the need for manual handling or time handling 71
′-I can.

■ The Ild field detection section and the electric circuit section can be installed separately, allowing remote sensing and
You can also set the distance of [I] freely.

99 Since it is constructed from inexpensive power generating elements, a small number of coils, and a simple circuit, it is extremely low cost and has low power consumption.

■Measurement can be started immediately after inputting the ton.

■ Since it can be defeated by the strength and direction of 1g, it is easy to connect it with the electronic aging device of the navigation control system.

■ Correction related to 11i + f insertion + 1i Th database.

With automatic correction - cBM definition - τ reconnaissance can be performed.

[Brief explanation of drawings]

The drawings are intended to explain the present invention, and FIG. 1 shows the basic principles of the magnetic field projection device of the present invention. A perspective view of the sensor for measuring the tm field of the present invention, an explanatory diagram showing the 1-phase relationship between the human power 6 flow and the output flow in the sensor shown in Fig. 2, and Figs. An example of the third
The figure is a perspective view of the ULS that reflects the magnetism, Figure 4 is a block diagram of the electric circuit, Figure 5 is a diagram showing the microprocessor's operating flow, and Figure 6 is the full force of the earth's magnetic field and each The explanatory diagram showing the relationship with the components, Figure 7, is an oblique, single-child diagram that does not show the other control buttons of this book. 11, 21, 31... Ribbon of amorphous pot, 12, 22. :U2...Excitation coil, l:U23
゜33...Detection coil, 14, 24, 34 Excitation bias coil, 15125.35...Detection bias coil, 40.41...Multiplexer, 43...
Synchronous detector, 44...Low pass filter, 45...
Connominator, 46... No. 1) 6 Generator, 47 Solid air flow source for excitation, 48... D-A backfill, 4
9...Microprocessor. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6: L and Figure 7 Procedure? rfl official document (method) February 27, 1980 Director of the Japan Patent Office Kazuo Wakasugi 1 Display of case 1988 Patent Application No. 1.66745 2 Name of invention Magnetic field measuring device 3 Case of person who corrects sleeves Relationship Patent applicant address: 1342-3 Tohoku-dori, Sugaya, Ageo City, Saitama Prefecture
Name: Waco Co., Ltd. Representative: Motoo Urata 4 Agents: 105 Telephone (0315011-98 (i6)
Address No. 1 Okana Building, 2-7-9 Toramon, Minato-ku, Tokyo January 1, 1980 +Yo January 31, 1982.
El (Shipping date) 6? 111 Positive target "Drawing" 7? lIlCorrect contents (in the 11th session, correct Figure 6 as shown in the attached sheet. Figure 6 1)

Claims (2)

[Claims] (1) Magnetic systems whose magnetic properties change as the external magnetic field changes are arranged in three directions orthogonal to each other. At least 2 magnetic elements are arranged around each tL of the three magnetic elements.
The OR field detection section is equipped with several coils. One of the above two coils has a predetermined <m signal? In addition, from the magnetic field Ii! and the detection signal output from the other coil, a -field Ii! 1i, the direction of the magnetic flux τml is determined [2, the 1+14 field strength in the 3 directions of the upper 6 pins and the width between the 1+1+ flux, the strength of the external magnetic field, the direction and the width to be determined; -) Naru bm world 1111
Legs elongated. (2) The magnetic field m111 foot device according to claim 1, characterized in that an amorphous alloy ribbon is used as the magnetic element.