CN1283998C - High sensitive isotropic space electromagnetic wave leakage detecting probe - Google Patents

Abstract

The present invention provides a high sensitive isotropic space electromagnetic wave leakage detecting probe. The present invention has the technical scheme that an antenna array is formed by three mutually perpendicular concentric dipoles and three high sensitive detector diodes; the whole antenna array is sealed in a probe cover made of polyethylene materials, and three groups of signals are led out by a six-core shielded wire. Because of a specific structure, the detecting probe has the characteristic of isotropy; the detecting probe is not needed to be rotated when space electromagnetic leakage is measured; the present invention not only can detect the electromagnetic wave leakage of a continuous wave source, but also solves the problem of the measurement of the leakage of a chopped radiation source of a hypogravity frequency pulse.

Description

High sensitivity, isotropic space electromagnetic-wave leakage detecting head

Affiliated technical field:

The invention belongs to the electromagnetic field technology field, it is particularly related to the electromagnetic wave detection technology.

Background technology

Space electromagnetic wave leak detection is a tested object with the light current magnetic radiation, is one of important research content of research directions such as environmental monitoring, environmental protection, electromagnetic compatibility and bioelectronics effect.Space electromagnetic-wave leakage acquisition sensor is the present space of the core devices electromagnetic leakage probe planar structures that adopt of carrying out this test more, as shown in Figure 1, monopole 1,2 is formed dipole, two pins of detector diode are welded on respectively on the monopole 1,2, the space electromagnetic leakage probe of the existing planar structure of the two electrode couples orthogonal composition of son need rotate probe and get the full test value during measurement.Adopt thermoelectric element to make sensitive element simultaneously, measurement sensitivity is lower, and the response time is long, can only be used for the leakage measuring instrumentation of continuous wave source.There is a small amount of probe to adopt 3-D solid structure abroad, but do not see complete homocentric quadrature three-dimensional probe so far. still need rotate during this type of probe measurement, thereby also can only measure the leakage of continuous wave source.

Summary of the invention:

The purpose of this invention is to provide a kind of high sensitivity, isotropic space electromagnetic-wave leakage detecting head, it has characteristics such as highly sensitive, isotropy, can not only survey the leakage of continuous wave source, and can survey the leakage in low repetition pulse modulated radiation source.

High sensitivity of the present invention, isotropic space electromagnetic-wave leakage probe, comprise probe cover 15, pressure ring 16, probe socket 17, handle 18, it is characterized in that the electromagnetic-wave leakage probe also comprises antenna array, the composition of described antenna array is: three orthogonal bonding jumpers 4 are arranged on first non-metallic floor 7,5,6, they are respectively first monopoles 4, second monopole 5, the 3rd monopole 6, wherein, second monopole 5, the 3rd monopole 6 is positioned at the base of first non-metallic floor 7, weld detector diode between second monopole 5 and the 3rd monopole 6, form the sub-5-6 of first electrode couple; First monopole 4 is perpendicular to the base of first non-metallic floor 7, and the extended line of first monopole 4, second monopole 5, the 3rd monopole 6 intersects at first intersection point 8, and disconnects insulation each other at first intersection point, 8 places; Equally, three strip metal bars 9 are arranged on second non-metallic floor 14,10,11, they are respectively the 4th monopole 9, the 5th monopole 10, the 6th monopole 11, wherein, the 5th monopole 10, the 6th monopole 11 is positioned at the base of second non-metallic floor 14, weld detector diode between the 5th monopole 10 and the 6th monopole 11, form the sub-10-11 of second electrode couple, the 4th monopole 9 hangs down as for the base of second non-metallic floor 14, the 4th monopole 9, the 5th monopole 10, the extended line of the 6th monopole 11 intersects at second intersection point 12, and disconnects insulation each other at second intersection point, 12 places; There is an interface 13 at intersection point 12 places at second non-metallic floor 14, the base of first non-metallic floor 7 is inserted in the interface 13 of second non-metallic floor 14, first non-metallic floor 7 is vertical mutually with second non-metallic floor 14, and second intersection point 12 on their bases overlaps with first intersection point 8, constitute three couples of homocentric and orthogonal dipole: 5-6,10-11,4-9 thus, each electrode couple is made of two bonding jumpers that the locus is in a straight line; Between first monopole 4 and the 4th monopole 9, weld detector diode, all welded a detector diode at each electrode couple subcenter place like this; At the sub-detector diode pin of each electrode couple place welding signal extension line, and keep insulating between three dipoles and the signal wire; So just form antenna array of the present invention.

The antenna array of making is put into probe socket 17, the second non-metallic floors 14 lie on the probe socket step 19, load onto pressure ring 16 and screw, make antenna array be fixed on the probe socket 17; Inject the low temperature hot melt adhesive in the antenna array center, to fix the locus of three electrode couple; Handle 18 is screwed in probe socket 17 fix, cable passes handle 18 and draws, and screws on probe cover 15; Just form high sensitivity of the present invention, isotropic space electromagnetic-wave leakage detecting head.

Need to prove: bonding jumper 4,5,6 on first non-metallic floor 7 and the bonding jumper on second non-metallic floor 14 9,10,11 adopt gold, silver or copper; The shape of described bonding jumper is a rectangle.The detector diode of every electrode couple subcenter welding adopts schottky diode; The interface 13 of the base circle centre position of second non-metallic floor 14 is rectangular channels.

For guaranteeing high measurement sensitivity, the electromagnetic consumable of probe cover 15 selected materials is little, probe cover 15 material selection tygon or teflon of the present invention; Pressure ring 16, material are tygon or teflon, and probe socket 17, material are tygon or teflon; Handle 18, material are the ordinary rigid plastics.

Principle of work of the present invention is: any one space vector can be with three Di Kaer coordinate ix, iy, the expression that iz is complete.This electric field E that just shows any point in the electromagnetic field can record by three dipoles that overlap with the Di Kaer coordinate.Know that according to Theory of Electromagnetic Field the near-field structure of a known radiation source is very complicated, form that it is distributed in most cases and can't obtains with analytic method even numerical method by induction field and radiation field two parts.And be that with the difference of traveling-wave field maximum any one all can not be showed by other two subitems in its three field components, when therefore measuring with bidimensional probe or non-homocentric three-dimensional probe, need to rotate repeatedly probe, so that electric field intensity is on the dipole plane.This just requires actinometry probe is the three-dimensional doublet with certain space structure, reaches all detectable purpose that goes out whole electric field components in where position in office with this.

After dipole detects the Space Microwave signal,, send into signal processing circuit and carry out processes and displays through the detection tube detection.If effective electrical length of dipole is l _Eff, tested electromagnetic field is E _x, E _y, E _z, know by antenna theory that then dipole is output as:

$\begin{array}{ccc}{\tilde{U}}_x\∝E_x{l}_{\mathrm{effx}}& {\tilde{U}}_y\∝E_y{l}_{\mathrm{effy}}& {\tilde{U}}_z\∝E_z{l}_{\mathrm{effz}}\end{array}---\left(1\right)$

Under the small-signal condition, the output behind detection tube:

$\begin{array}{ccc}{U}_x\∝E_x^2{l}_{\mathrm{effx}}^2& U_y\∝E_y^2{l}_{\mathrm{effy}}^2& U_z\∝E_z^2{l}_{\mathrm{effz}}^2\end{array}---\left(2\right)$

By theorem in the Theory of Electromagnetic Field:

$\left|\stackrel{\→}{S}\right|\∝E^2$ (S is an energy flux density) (3)

So: U _x∝ S _xU _y∝ S _yU _z∝ S _z(4) can be tested electromagnetic field energy flux density after its adjustment of data with directly synthetic demonstration of three-way output signal conditioning back of probe with this understanding:

U＝U _x+U _y+U _z S＝S _x+S _y+S _z

∴U∝S

According to above-mentioned analysis, under the three tunnel signal processing circuits complete match condition corresponding with three dipoles, complete homocentric quadrature three-dimensional probe can need not any rotation, directly measures tested.Cooperate fast response transducer, signal processing circuit and maximal value holding circuit, the microwave leakage that can solve low repetition pulse modulated radiation source detects problem.

The invention has the beneficial effects as follows with homocentric quadrature 3 D stereo probe measurement space radiation field and need not rotate probe, have high measuring accuracy and sensitivity, solved low repetition pulsed modulation source leakage measuring instrumentation problem simultaneously.

Description of drawings:

Fig. 1 is a pair of dipole, detection tube basic structure and annexation synoptic diagram

Wherein, the 1, the 2nd, monopole (1-2) constitutes dipole, the 3rd, detector diode;

Fig. 2 is the structural representation of a non-metallic floor in the antenna array

Wherein, 4,5,6 is respectively first monopole, second monopole, the 3rd monopole, and they are orthogonal, (5-6) constitutes dipole, and 7 is first non-metallic floors, the 8th, and the extended line joining of monopole 4,5,6;

Fig. 3 is the structural representation of another piece non-metallic floor in the antenna array

Wherein, 9,10,11 are respectively the 4th monopole, the 5th monopole, the 6th monopole, and they are orthogonal, (10-11) constitute dipole, 14 is second non-metallic floors, the 12nd, and the extended line joining of monopole 9,10,11, the 13rd, be positioned at 12 interfaces of locating;

Fig. 4 is the antenna array perspective view

Wherein, X, Y, Z represent three coordinate axis, at X-Y plane two pairs of mutually perpendicular dipoles (4-9), (10-11) are arranged, a pair of dipole (5-6) is arranged on the Y-Z plane, three electrode couple (4-9), (10-11), (5-6) are orthogonal in twos and just giving a little 8 (or 12);

Fig. 5 is the probe longitudinal profile structural map (not containing antenna array) of one embodiment of the invention

Wherein, 15 is probe cover, and 16 is pressure ring, and 17 is probe socket, and 18 is handle, and 19 for placing the step of antenna array.

Embodiment

The composition of antenna array is to open a rectangular channel 13 at the base of semicircle thin plate 14 circle centre position 12, the base of triangular sheets 7 is inserted in the base groove 13 of semicircle thin plate 14, make two thin plates vertical mutually, and the center 8,12 on base overlaps, be etched with three orthogonal rectangular-bar coppers on semicircle thin plate 14 and the triangular sheets 7 respectively, distributing position is shown in Fig. 2,3; Constitute three pairs of homocentric and orthogonal dipoles (two rectangular-bar coppers that the locus is in a straight line constitute a pair of dipole) thus.At each electrode couple subcenter place welding schottky diode and signal extension line, and the insulation between three dipoles of attention maintenance and the signal wire, as shown in Figure 4.

As shown in Figure 5, the antenna array of making is put into probe socket 17, semicircle thin plate 14 lies on the probe socket step 19, loads onto pressure ring 16 and screws, and makes antenna array be fixed on the probe socket 17; Inject the low temperature hot melt adhesive in the antenna array center, fix the locus of three detection tube positions and dipole, insulated from each other; Handle 18 is screwed in probe socket 17 fix, cable adopts six core shielding lines to pass handle 18 and draws, and screws on probe cover 15.Like this, just form high sensitivity of the present invention, isotropic space electromagnetic-wave leakage detecting head.

Claims (4)

1, a kind of high sensitivity, isotropic space electromagnetic-wave leakage probe, comprise probe cover (15), pressure ring (16), probe socket (17), handle (18), it is characterized in that high sensitivity, isotropic space electromagnetic-wave leakage probe also comprises antenna array, the composition of described antenna array is: three orthogonal bonding jumpers are arranged on first non-metallic floor (7), they are respectively first monopole (4), second monopole (5), the 3rd monopole (6), wherein, second monopole (5), the 3rd monopole (6) is positioned at the base of first non-metallic floor (7), weld detector diode between second monopole (5) and the 3rd monopole (6), form first electrode couple (5-6); First monopole (4) is perpendicular to the base of first non-metallic floor (7), and the extended line of first monopole (4), second monopole (5), the 3rd monopole (6) intersects at first intersection point (8), and locates to disconnect each other insulation at first intersection point (8); Equally, three strip metal bars are arranged on second non-metallic floor (14), they are respectively the 4th monopole (9), the 5th monopole (10), the 6th monopole (11), wherein, the 5th monopole (10), the 6th monopole (11) is positioned at the base of second non-metallic floor (14), weld detector diode between the 5th monopole (10) and the 6th monopole (11), form second electrode couple (10-11), the 4th monopole (9) is perpendicular to the base of second non-metallic floor (14), the 4th monopole (9), the 5th monopole (10), the extended line of the 6th monopole (11) intersects at second intersection point (12), and locates to disconnect each other insulation at second intersection point (12); Intersection point (12) in second non-metallic floor (14) has been located an interface (13), the base of first non-metallic floor (7) is inserted in the interface (13) of second non-metallic floor (14), first non-metallic floor (7) is vertical mutually with second non-metallic floor (14), and second intersection point (12) is overlapped with first intersection point (8), constitute three pairs of homocentric and orthogonal dipoles thus: (5-6), (10-11), (4-9), each electrode couple is made of two bonding jumpers that the locus is in a straight line; Between first monopole (4) and the 4th monopole (9), weld detector diode, all welded a detector diode at each electrode couple subcenter place like this; At the sub-detector diode pin of each electrode couple place welding signal extension line, and keep insulating between three dipoles and the signal wire; So just form antenna array of the present invention.

2, a kind of high sensitivity according to claim 1, isotropic space electromagnetic-wave leakage probe is characterized in that bonding jumper (4,5,6) and the bonding jumper (9,10,11) on second non-metallic floor (14) on described first non-metallic floor (7) adopts gold, silver or copper; The shape of described bonding jumper is a rectangle.

3, a kind of high sensitivity according to claim 1, isotropic space electromagnetic-wave leakage probe is characterized in that the interface (13) of the base circle centre position of described second non-metallic floor (14) is a rectangular channel.

4, a kind of high sensitivity according to claim 1, isotropic space electromagnetic-wave leakage probe is characterized in that the shape of described first non-metallic floor (7) is a triangle; The shape of described second non-metallic floor (14) is semicircle.

Images