CN104810626B - Double frequency ground exploring radar antenna in a kind of hole - Google Patents
Double frequency ground exploring radar antenna in a kind of hole Download PDFInfo
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- CN104810626B CN104810626B CN201510093545.6A CN201510093545A CN104810626B CN 104810626 B CN104810626 B CN 104810626B CN 201510093545 A CN201510093545 A CN 201510093545A CN 104810626 B CN104810626 B CN 104810626B
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Abstract
The present invention relates to double frequency ground exploring radar antenna in a kind of hole, it is arranged in the preformed hole of foundation pit enclosure structure, to detect the disease of foundation pit enclosure structure, including sleeve pipe, ttom of pipe sealing block, tube top sealing block, coaxial cable and to be oppositely arranged on the top antenna of inside pipe casing extremely son and bottom antenna extremely sub, each antenna extremely son includes conical antenna head, first antenna section, frequency conversion joint and the second antenna section being sequentially connected, conical antenna head of the head of described coaxial cable respectively with each antenna extremely son is connected, and afterbody is connected with tube top sealing block.Compared with prior art, there is the present invention small centre frequency height, high resolution, size, simple to operate, variable ratio frequency changer, strength of materials height, light weight, making to process simple, low cost and other advantages.
Description
Technical field
The present invention relates to a kind of radar antenna, more particularly, to double frequency ground exploring radar antenna in a kind of hole.
Background technology
In recent years, deeply developing for city function is progressively switched to carry out extensive, profound level to the underground space to open
Hair and utilization, such as track traffic hub station, across rivers Important Projects and the skyscraper underground space.In underground engineering
In construction, foundation pit enclosure structure is the crucial carrier for ensureing underground engineering safety and Environmental security, but due to going along with sb. to guard him type increasingly
Complexity, working procedure is complicated, and work quality is difficult to control, plus geological condition it is changeable etc. it is many it is unpredictalbe it is unfavorable because
Element, it will largely influence whether the quality of foundation pit enclosure structure.Often there is cavity, folder mud, crack, isolation in building enclosure
And the major quality disease such as building enclosure curtailment, cause building enclosure to occur percolating water, quicksand, branch in excavation of foundation pit
Strut and split, or even water sudden soil flooding, foundation ditch in foundation ditch occurs and collapses equivalent risk event, seriously affect foundation ditch safety in itself and week
The safety of the surrounding enviroment such as side subway, tunnel, underground utilities and buildings or structures.But the detection mesh to building enclosure disease
Preceding not ripe method, existing method are the technology and equipment using existing pile measurement or geological prospecting mostly, are lacked
Weary specific aim, therefore Detection results can not ensure.
The depth that building enclosure is typically inserted into stratum is larger, therefore, by the preformed hole in building enclosure visit in hole
Ground detections of radar is all more feasible scheme in theory and practice.One of the core component of antenna as GPR, it is right
The implementation of detection work plays vital effect.But ground exploring radar antenna is used for geology tune in current existing business hole
Field is looked into, antenna frequencies are relatively low, and size is larger, and resolving power is relatively low, can not meet the needs of building enclosure Defect inspection.Therefore,
A kind of ground exploring radar antenna suitable for the novel hole of building enclosure Defect inspection is urgently developed, possesses following characteristic：
1st, working frequency.According to building enclosure and the size characteristics of disease, it is desirable to which electromagnetic wave can inside building enclosure
Certain distance is penetrated, and can tells the disease of certain size.According to engineering practice, antenna is needed in 200MHz~500MHz frequencies
There is preferable service behaviour in section.
2nd, antenna gain., can in the range of high-gain enables input power concentrated radiation detection needed for of antenna
The investigation depth of GPR is effectively increased, can the significantly more efficient disease detected inside building enclosure.
3rd, antenna size.Due in building enclosure generally reserve standard-sized deviational survey hole, therefore antenna size strictly by
It is formed on the size of hole.
It is big even with omnidirectional's cylindricality that Patent No. CN102354794B Chinese patent discloses a kind of underground geology detecting thunder
Pole sub-antenna, the antenna include：By the tubular cylinder of monopole antenna, conical antenna head, between aerial head and antenna section and
Loading resistor and corresponding compression spring, internode fixed cover between each antenna section in both ends of the surface bore, support tube, nut set group
Into monopole antenna, be connected set, coaxial cable, and the centre frequency of the antenna is only 100MHz, and is unable to frequency conversion, limitation
Investigative range, complicated, cost is higher, and volume is larger, may be only available for underground and be not applied for foundation pit enclosure
Structure.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of centre frequency is high, divides
Resolution is high, size is small, simple to operate, variable ratio frequency changer, the strength of materials height, light weight, make processing simply, double frequency in the low hole of cost
Ground exploring radar antenna.
The purpose of the present invention can be achieved through the following technical solutions：
Double frequency ground exploring radar antenna, is arranged in the preformed hole of foundation pit enclosure structure in a kind of hole, is enclosed to detect foundation ditch
The disease of protection structure, including sleeve pipe, ttom of pipe sealing block, tube top sealing block, coaxial cable and it is oppositely arranged on inside pipe casing
Top antenna extremely son and bottom antenna is extremely sub, and each antenna extremely son includes conical antenna head, the first antenna being sequentially connected
Section, frequency conversion joint and the second antenna section, the head of the described coaxial cable conical antenna head extremely sub with each antenna respectively
Connection, afterbody are connected with tube top sealing block.
Described frequency conversion joint is copper joint group or acrylic joint group.
The working frequency of described ground exploring radar antenna is 200-500MHz, when frequency conversion joint is copper joint group, in
Frequency of heart is 270MHz, when frequency conversion joint is acrylic joint group, centre frequency 500MHz.
Described copper joint group includes separate type copper joint and monoblock type copper joint, described acrylic joint group
Including separate type acrylic joint and monoblock type acrylic joint, described monoblock type copper joint or monoblock type acrylic joint
It is arranged in bottom antenna extremely son, it is extremely sub that described separate type copper joint or separate type acrylic joint are arranged on top antenna
In.
The outer rim of described frequency conversion joint is provided with external screw thread, is respectively equipped with described first antenna section and the second antenna section
Internal thread, described frequency conversion joint are connected through a screw thread with first antenna section and the second antenna section respectively.
Described conical antenna head, first antenna section and the second antenna section is copper, and conical antenna head is solid
Cone, first antenna section and the second antenna section are hollow cylinder.
Described tube top sealing block is provided with the coaxial fitting being connected with coaxial cable, described coaxial fitting
It is fixed by screws on tube top sealing block.
The material of described sleeve pipe, ttom of pipe sealing block and tube top sealing block is acrylic, first antenna section and second day
Epoxy resin is filled between line section and sleeve pipe.
The inner wire of the described coaxial cable conical antenna head extremely sub with bottom antenna welds, outer conductor and top antenna
Extremely sub conical antenna head welding.
Snap ring is additionally provided with described frequency conversion joint outer rim.
Compared with prior art, the present invention has advantages below：
First, centre frequency height, high resolution：The centre frequency of the radar antenna of the present invention is 270MHz and 500MHz, far
Much larger than the centre frequency of antenna on the market, it is particular enable to adapt to the complicated geological environment of foundation pit enclosure structure.
2nd, size is small：The present invention is adapts to the aperture in the reserved deviational survey hole in foundation pit enclosure structure, and high 481mm, external diameter is only
There is 60mm, be fully able to adapt to the aperture in reserved deviational survey hole.
3rd, simple to operate, variable ratio frequency changer：One group of frequency conversion joint need to only be backed out during frequency conversion, change another group of frequency conversion joint i.e.
Frequency can be changed, it is simple in construction, it is easy to operate.
4th, strength of materials height, light weight：Present invention sealing and sleeve pipe use acrylic material, and height is high, meets building ring
Protection to antenna and seal request in border, and light weight, it is easy to carry, changes and durable.
5th, making processing is simple, cost is low：The structure and encapsulating material of antenna are regular shapes, and it is common with material,
Manufacturing procedure is few, is easy to research and development to improve.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the structural representation of separate type frequency conversion joint.
Fig. 3 is the structural representation of monoblock type frequency conversion joint.
Fig. 4 is the structural representation of distributing point.
Fig. 5 is the return loss plot coordinate diagram of simulation run.
Wherein, 1, conical antenna head, 2, first antenna section, the 3, second antenna section, 4, frequency conversion joint, 5, coaxial cable,
6th, sleeve pipe, 7, coaxial fitting, 8, ttom of pipe sealing block, 9, tube top sealing block.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
It is an object of the invention to provide double frequency ground exploring radar antenna in a kind of hole, the antenna, can according to different detection examples
Worked respectively in centre frequency 270MHz and 500MHz or so, there is higher gain to increase detection range, its size can
Meet the requirement of building enclosure reserving hole.
Embodiment 1：
As shown in figure 1, double frequency ground exploring radar antenna in a kind of hole, is arranged in the preformed hole of foundation pit enclosure structure, to
Detect the disease of foundation pit enclosure structure, including sleeve pipe 6, ttom of pipe sealing block 8, tube top sealing block 9, coaxial cable 5 and relative set
Top antenna extremely son and the bottom antenna put inside sleeve pipe 6 are extremely sub, and each antenna extremely son includes the cone being sequentially connected
Aerial head 1, first antenna section 2, the antenna section 3 of frequency conversion joint 4 and second, the head of coaxial cable 5 are extremely sub with each antenna respectively
Conical antenna first 1 connect, afterbody is connected with tube top sealing block 9.
The outer rim of frequency conversion joint 4 is provided with external screw thread, and internal thread is respectively equipped with the antenna section 3 of first antenna section 2 and second, becomes
Frequency joint 4 is connected through a screw thread with the antenna section 3 of first antenna section 2 and second respectively, and snap ring is additionally provided with the outer rim of frequency conversion joint 4,
Conical antenna is first 1, the antenna section 3 of first antenna section 2 and second is copper, and conical antenna first 1 is solid cone, and first
The antenna section 3 of antenna section 2 and second is hollow cylinder, and tube top sealing block 9 is provided with the coaxial cable being connected with coaxial cable 5
Joint 7, coaxial fitting 7 are fixed by screws on tube top sealing block 9, sleeve pipe 6, ttom of pipe sealing block 8 and tube top sealing block 9
Material be acrylic, epoxy resin, coaxial cable 5 are filled between the antenna section 3 of first antenna section 2 and second and sleeve pipe 6
Inner wire and the extremely sub conical antenna first 1 of bottom antenna weld, the outer conductor conical antenna first 1 extremely sub with top antenna
Welding, frequency conversion joint 4 can connect the antenna section 3 of first antenna section 2 and second, so as to increase antenna length to play reduction antenna
The effect of frequency.
As shown in figure 4, coaxial cable 5 enters antenna by antenna one is extremely interior, at conical antenna first 1 with day wire bonding,
Wherein inner wire is connected with top conical shape aerial head tip, and outer conductor is connected with bottom conical antenna head tip, coaxial electrical
Remaining current-carrying part of cable can not be with day linear contact lay.
As shown in Figures 2 and 3, frequency conversion joint 4 includes separate type joint and integral joint, and wherein separate type joint is used for
The extremely sub antenna section of top antenna is connected, integral joint is used to connect the extremely sub antenna section of bottom antenna.
When frequency conversion joint 4 is copper joint group, operating center frequency 270MHz, copper joint group includes separate type copper
Matter joint and monoblock type copper joint, monoblock type copper joint are arranged in bottom antenna extremely son, and separate type copper joint is set
In top antenna extremely son.
The specific size of this antenna is as follows：
Conical antenna first 1 is cone, bores high 14mm, cone bottom diameter 48mm, and cone drills along axis, aperture 2mm, two
The cone distance 3mm of conical antenna first 1；First antenna section 2 is hollow cylinder, height 110mm, external diameter 48mm, wall thickness
3mm, internal thread, thread depth 20mm are made in post tips；Second antenna section 3 is hollow cylinder, height 105mm, external diameter
48mm, wall thickness 3mm, internal thread, thread depth 20mm are made in cylinder front end；Frequency conversion joint 4 is the open circles that there is projection at middle part
Cylinder, internal diameter 38mm, height 45mm, wherein making external screw thread in each 20mm altitude ranges up and down, external diameter 42mm, middle 5mm is high
Spend scope internal-and external diameter 48mm.Sleeve pipe 6 is acrylic pipe, height 481mm, external diameter 60mm, wall thickness 5mm；Ttom of pipe sealing block 8 is sub- gram
Power cylinder, height 5mm, diameter 48mm；Tube top sealing block 9 is acrylic cylinder, height 20mm, diameter 48mm, along cylinder
The hole that body axis make a diameter of 10mm is used to install coaxial fitting.
Embodiment 2：
When frequency conversion joint 4 is acrylic joint group, operating center frequency 500MHz, acrylic joint group includes separation
Formula acrylic joint and monoblock type acrylic joint, monoblock type acrylic joint are arranged in bottom antenna extremely son, and separate type is sub-
Gram force joint is arranged in top antenna extremely son, and the remainder in the present embodiment is same as Example 1.
As shown in figure 5, figure be respectively using numerical simulation when copper frequency conversion joint and acrylic frequency conversion joint under the conditions of
Return loss plot figure, its centre frequency is respectively 270MHz and 500Mhz, return loss value respectively reach -23dB and -
25dB, illustrate that antenna has preferable service behaviour near the two frequencies.
Table 1 for the present invention ground exploring radar antenna with the data of ordinary radar antenna compared with, it is of the invention to have from table
There are small centre frequency height, high resolution, size, variable ratio frequency changer, light weight, making to process simple, low cost and other advantages.
Table 1
| Size (mm) | Weight (kg) | Cost of manufacture | Resolution ratio | Frequency conversion performance | |
| 100M | 1300x50 | 5.2 | It is higher | It is relatively low | Can not frequency conversion |
| 270/500M | 481x60 | 1.5 | It is relatively low | It is higher | Variable ratio frequency changer |
Claims (6)
1. double frequency ground exploring radar antenna, is arranged in the preformed hole of foundation pit enclosure structure in a kind of hole, to detect foundation pit enclosure
The disease of structure, it is characterised in that including sleeve pipe (6), ttom of pipe sealing block (8), tube top sealing block (9), coaxial cable (5) and
It is extremely sub to be oppositely arranged on the internal top antenna of sleeve pipe (6) extremely son and bottom antenna, each antenna extremely son includes being sequentially connected
Conical antenna head (1), first antenna section (2), frequency conversion joint (4) and the second antenna section (3), described coaxial cable (5)
The conical antenna head (1) extremely sub with each antenna is connected respectively on head, afterbody is connected with tube top sealing block (9), described
Frequency conversion joint (4) is copper joint group or acrylic joint group, and the working frequency of described ground exploring radar antenna is 200-
500MHz, when frequency conversion joint (4) is copper joint group, centre frequency 270MHz, when frequency conversion joint (4) is acrylic joint
During group, centre frequency 500MHz, described copper joint group includes separate type copper joint and monoblock type copper joint, described
Acrylic joint group include separate type acrylic joint and monoblock type acrylic joint, described monoblock type copper joint or whole
Body formula acrylic joint is arranged in bottom antenna extremely son, and described separate type copper joint or separate type acrylic joint are set
In top antenna extremely son, the material of described sleeve pipe (6), ttom of pipe sealing block (8) and tube top sealing block (9) is acrylic,
Epoxy resin is filled between first antenna section (2) and the second antenna section (3) and sleeve pipe (6).
2. double frequency ground exploring radar antenna in a kind of hole according to claim 1, it is characterised in that described frequency conversion joint
(4) outer rim is provided with external screw thread, and internal thread is respectively equipped with described first antenna section (2) and the second antenna section (3), described
Frequency conversion joint (4) is connected through a screw thread with first antenna section (2) and the second antenna section (3) respectively.
3. double frequency ground exploring radar antenna in a kind of hole according to claim 1, it is characterised in that described conical antenna
Head (1), first antenna section (2) and the second antenna section (3) are copper, and conical antenna head (1) is solid cone, first day
Line section (2) and the second antenna section (3) are hollow cylinder.
4. double frequency ground exploring radar antenna in a kind of hole according to claim 1, it is characterised in that described tube top sealing block
(9) coaxial fitting (7) being connected with coaxial cable (5) is provided with, described coaxial fitting (7) is fixed by screw
On tube top sealing block (9).
5. double frequency ground exploring radar antenna in a kind of hole according to claim 1, it is characterised in that described coaxial cable
(5) the inner wire conical antenna head extremely sub with bottom antenna welds, and the outer conductor conical antenna head extremely sub with top antenna welds
Connect.
6. double frequency ground exploring radar antenna in a kind of hole according to claim 1, it is characterised in that described frequency conversion joint
(4) snap ring is additionally provided with outer rim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510093545.6A CN104810626B (en) | 2015-03-02 | 2015-03-02 | Double frequency ground exploring radar antenna in a kind of hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510093545.6A CN104810626B (en) | 2015-03-02 | 2015-03-02 | Double frequency ground exploring radar antenna in a kind of hole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104810626A CN104810626A (en) | 2015-07-29 |
| CN104810626B true CN104810626B (en) | 2017-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510093545.6A Active CN104810626B (en) | 2015-03-02 | 2015-03-02 | Double frequency ground exploring radar antenna in a kind of hole |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305063B (en) * | 2015-10-12 | 2018-02-02 | 国网上海市电力公司 | A kind of pipeline radar antenna for electricity channel damage check |
| CN114696071B (en) * | 2020-12-28 | 2024-07-09 | 电连技术股份有限公司 | Sucker antenna with high gain and wide frequency band |
| CN115118549A (en) * | 2022-07-04 | 2022-09-27 | 中国科学院沈阳自动化研究所 | Bridge structure of large-depth underwater robot |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4963879A (en) * | 1989-07-31 | 1990-10-16 | Alliance Telecommunications Corp. | Double skirt omnidirectional dipole antenna |
| CN102354794A (en) * | 2011-06-17 | 2012-02-15 | 电子科技大学 | Omnidirectional cylindrical dipole antenna for underground earth-probing radars |
-
2015
- 2015-03-02 CN CN201510093545.6A patent/CN104810626B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4963879A (en) * | 1989-07-31 | 1990-10-16 | Alliance Telecommunications Corp. | Double skirt omnidirectional dipole antenna |
| CN102354794A (en) * | 2011-06-17 | 2012-02-15 | 电子科技大学 | Omnidirectional cylindrical dipole antenna for underground earth-probing radars |
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| Publication number | Publication date |
|---|---|
| CN104810626A (en) | 2015-07-29 |
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