CN201464564U - Helical rod electric field probe - Google Patents
Helical rod electric field probe Download PDFInfo
- Publication number
- CN201464564U CN201464564U CN2009200819332U CN200920081933U CN201464564U CN 201464564 U CN201464564 U CN 201464564U CN 2009200819332 U CN2009200819332 U CN 2009200819332U CN 200920081933 U CN200920081933 U CN 200920081933U CN 201464564 U CN201464564 U CN 201464564U
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- screw rod
- electric field
- field probe
- concentric cable
- rod electric
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Abstract
The utility model discloses a helical rod electric field probe which comprises a semi-rigid coaxial cable (1) and a BNC socket (2) arranged on one end of the semi-rigid coaxial cable (1); the other end of the semi-rigid coaxial cable (1) is provided with a helical rod (3); the helical rod (3) is respectively provided with spiral grooves (4) along the forward direction and the backward direction; spiral wires (5) are wound in the spiral grooves; one end of each forwards and backwards wound spiral wire (5) which is close to the semi-rigid coaxial cable (1) is connected with an inner conductor (6) of the semi-rigid coaxial cable (1), and one end which is away from the semi-rigid coaxial cable (1) does not mutually contact. By adopting a double spiral antenna, the helical rod electric field probe overcomes the defect of low gain of the prior rod-shaped electric field probe; and in addition, because the antenna factors are calibrated, the helical rod electric field probe can be used to measure the absolute value of the field intensity of a position.
Description
Technical field
The utility model relates to sensor field, specifically is meant a kind of screw rod electric field probe.
Background technology
The rod electric field probe belongs to the sensor class, is widely used in determining the field intensity of local noise source, near field, electromagnetic leakage and electromagnetic interference source Radiation Emission, can be used for observational measurement and quantitative measurment.At present, the rod electric field probe that uses is representative with the 7405 serial 905 type rod electric field probes that U.S. ETS-lindgren company makes both at home and abroad, and popping one's head in is electric little single dipole antenna, and structural representation as shown in Figure 1.
For diagnostic measures, if seek partial radiation source, should select less electric field magnet field probe for use, so that dwindle the scope of searching and improve spatial resolving power, but probe size is too little, its gain also can be very low.Because the 7405 serial 905 type rod electric field probes that U.S. ETS-lindgren company makes adopt electric little single dipole antenna, so gain is very low.
The utility model content
The purpose of this utility model is in order to overcome the deficiencies in the prior art and defective, a kind of screw rod electric field probe is provided, this screw rod electric field probe has overcome the low shortcoming of existing rod electric field probe gain, the electric little single dipole antenna height that its ratio of gains is onesize by adopting dual spiral antenna; And, therefore can be used for measuring the absolute value of somewhere field intensity owing to calibrate antenna factor.
The purpose of this utility model is achieved through the following technical solutions: the screw rod electric field probe, comprise half firm concentric cable and the BNC socket that is installed in half firm concentric cable one end, the other end of described half firm concentric cable is equipped with screw rod, at screw rod upper edge forward with oppositely be respectively arranged with helicla flute, all be wound with helix in the helicla flute, described forward and the helix that oppositely twines near half just concentric cable an end all with half just the inner wire of concentric cable be connected, do not contact mutually away from the other end of partly firm concentric cable.
Described BNC socket is welded on an end of half firm concentric cable.
One end end face of the close half firm concentric cable of described screw rod is provided with the groove that is complementary with half firm concentric cable diameter, and described half firm concentric cable one end is fixed in the groove.
The external diameter of described half firm concentric cable is 3.6mm.
Described screw rod is that plastics are made.
Described screw rod diameter is 8mm.
Described helix is the enameled wire of diameter 0.3mm.
The winding number of turn of described helix is 10 circles.
Described spiral fluted groove depth is 0.5mm, and spacing is 6mm.
The outside surface of described half firm concentric cable, BNC socket and screw rod is provided with insulation course, and insulation course adopts Shooting Technique twice.
In sum, the beneficial effects of the utility model are: by adopting dual spiral antenna, overcome the low shortcoming of existing rod electric field probe gain; Use injection molding way twice, make half firm concentric cable, BNC socket and screw rod remain on the injection mold center, improved insulativity, reliability and the aesthetic property of probe; And, therefore can be used for measuring the absolute value of somewhere field intensity owing to calibrate antenna factor.
Description of drawings
Fig. 1 is the structural representation of existing ETS 905 rods probe;
Fig. 2 is a structural representation of the present utility model;
Fig. 3 is the radiation direction synoptic diagram of helical antenna;
Fig. 4 is the loaded cable and the field intensity synoptic diagram relatively of loaded cable antenna not;
Fig. 5 is a screw rod electric field probe antenna factor synoptic diagram.
Mark and corresponding parts title: 1-half firm concentric cable in the accompanying drawing; The 2-BNC socket; The 3-screw rod; The 4-helicla flute; The 5-helix; The 6-inner wire.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the utility model do, but embodiment of the present utility model is not limited thereto.
Embodiment:
Screw rod electric field probe as shown in Figure 2 as can be known, this screw rod electric field probe comprises half firm concentric cable 1 and the BNC socket 2 that is installed in half firm concentric cable 1 one ends, the other end of described half firm concentric cable 1 is equipped with screw rod 3, at screw rod 3 upper edge forwards with oppositely be respectively arranged with helicla flute 4, all be wound with helix 5 in the helicla flute, described forward and the helix 5 that oppositely twines near half just concentric cable 1 an end all with half just the inner wire 6 of concentric cable 1 be connected, do not contact mutually away from the other end of partly firm concentric cable 1.
The outside surface of described half firm concentric cable 1, BNC socket 2 and screw rod 3 all is injected with insulation course; One end of half firm concentric cable 1 links to each other with BNC socket 2, and its inner wire is with the inner wire welding of BNC socket 2, and its outer conductor is with the outer conductor welding of BNC socket 2; The other end of half firm concentric cable 1 links to each other with screw rod 3, and an end end face of screw rod 3 close half firm concentric cable 1 is provided with the groove that is complementary with partly firm concentric cable 1 diameter, and described half firm concentric cable 1 one ends are inserted and secured in the groove; Screw rod 3 is made for plastics, and its diameter is 8mm; Helix 5 is the enameled wire of diameter 0.3mm, and twining the number of turn is 10 circles; The groove depth of helicla flute 4 is 0.5mm, and spacing is 6mm.
The radiation direction of helical antenna is relevant with helix 5 diameter D, when helix 5 diameters are more much smaller than wavelength X (D/ λ＜0.18), the strongest normal mode that is of radiation is shown in Fig. 3 left side on perpendicular to the plane of the axis of screw, and is the ∞ font shown in Fig. 3 right side at the directional diagram in the screw axis plane.
Adopt two-wire 180 ° of the then feeding point phase phasic differences of rewinding, gain is than simple helix height, because spiral is an inc loop, does not have electric current to flow, and can only pick up electric field component.
In order to improve the way that antenna gain, efficient and shortening length often adopt loaded cable, as seen in Figure 4, whether the antenna ratio of the loaded cable or not antenna of will improve about 10dB.
Because the helical antenna essence of D/ λ＜＜1 is the antenna of a continuous loaded cable, when along helix 5 when propagating near the apparent phase velocity of the light velocity, phase velocity in its helical axis directions will be less than the light velocity, therefore corresponding wavelength will shorten, in other words having shortened the length of required antenna. spiral itself is equivalent to an inductance, form resonance easily. in addition, electric current near sinusoidal along helix 5 distributes. because the phase speed ratio linear dipole antennas that electromagnetic wave is propagated along spiral is little, resonance length can shorten, the distribution of current trend evenly, so compare with onesize electric little single dipole antenna, its volume is little, gain is high. owing to calibrate antenna factor (as shown in Figure 5), therefore can be used for measuring the absolute value of somewhere field intensity.
As mentioned above, just can realize the utility model preferably.
Claims (10)
1. screw rod electric field probe, comprise half firm concentric cable (1), and the BNC socket (2) that is installed in half firm concentric cable (1) one end, it is characterized in that, the other end of described half firm concentric cable (1) is equipped with screw rod (3), at screw rod (3) upper edge forward with oppositely be respectively arranged with helicla flute (4), all be wound with helix (5) in the helicla flute, described forward and the helix (5) that oppositely twines near half just concentric cable (1) an end all with half just the inner wire (6) of concentric cable (1) be connected, do not contact mutually away from the other end of partly firm concentric cable (1).
2. screw rod electric field probe according to claim 1 is characterized in that, the outside surface of described half firm concentric cable (1), BNC socket (2) and screw rod (3) is provided with insulation course.
3. screw rod electric field probe according to claim 1 is characterized in that, described BNC socket (2) is welded on an end of half firm concentric cable (1).
4. screw rod electric field probe according to claim 1, it is characterized in that, one end end face of the close half firm concentric cable (1) of described screw rod (3) is provided with the groove that is complementary with half firm concentric cable (1) diameter, and described half firm concentric cable (1) one end is fixed in the groove.
5. screw rod electric field probe according to claim 1 is characterized in that, the external diameter of described half firm concentric cable (1) is 3.6mm.
6. screw rod electric field probe according to claim 1 is characterized in that, described screw rod (3) is made for plastics.
7. screw rod electric field probe according to claim 1 is characterized in that, described screw rod (3) diameter is 8mm.
8. screw rod electric field probe according to claim 1 is characterized in that, described helix (5) is the enameled wire of diameter 0.3mm.
9. screw rod electric field probe according to claim 1 is characterized in that, described helix (5) wound convolution number average is 10 circles.
10. screw rod electric field probe according to claim 1 is characterized in that, the groove depth of described helicla flute (4) is 0.5mm, and spacing is 6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200819332U CN201464564U (en) | 2009-06-23 | 2009-06-23 | Helical rod electric field probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200819332U CN201464564U (en) | 2009-06-23 | 2009-06-23 | Helical rod electric field probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201464564U true CN201464564U (en) | 2010-05-12 |
Family
ID=42391914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200819332U Expired - Fee Related CN201464564U (en) | 2009-06-23 | 2009-06-23 | Helical rod electric field probe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201464564U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106246174A (en) * | 2016-08-12 | 2016-12-21 | 中国石油天然气集团公司 | A kind of column specific retention detection probe based on electromagnetic wave |
-
2009
- 2009-06-23 CN CN2009200819332U patent/CN201464564U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106246174A (en) * | 2016-08-12 | 2016-12-21 | 中国石油天然气集团公司 | A kind of column specific retention detection probe based on electromagnetic wave |
| CN106246174B (en) * | 2016-08-12 | 2019-06-11 | 中国石油天然气集团公司 | A kind of column specific retention detection probe based on electromagnetic wave |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20170623 |