CN104810626A - In-hole dual-frequency ground penetrating radar antenna - Google Patents
In-hole dual-frequency ground penetrating radar antenna Download PDFInfo
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- CN104810626A CN104810626A CN201510093545.6A CN201510093545A CN104810626A CN 104810626 A CN104810626 A CN 104810626A CN 201510093545 A CN201510093545 A CN 201510093545A CN 104810626 A CN104810626 A CN 104810626A
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Abstract
The invention relates to an in-hole dual-frequency ground penetrating radar antenna, which is arranged in a reserved hole of a foundation pit support structure for detecting diseases of the foundation pit support structure. The in-hole dual-frequency ground penetrating radar antenna comprises a casing, a casing bottom sealing block, a casing top sealing block, a coaxial cable, and a top antenna polaron and a bottom antenna polaron arranged inside the casing oppositely, wherein each antenna polaron comprises a conical antenna head, a first antenna joint, a variable frequency joint and a second antenna joint connected sequentially; the head part of the coaxial cable is respectively connected with the conical antenna head of each antenna polaron, and the tail is connected with the casing top sealing block. Compared with the prior art, the in-hole dual-frequency ground penetrating radar antenna has the advantages of high central frequency, high resolution, small size, simple operation, variable operation, high material strength, light weight, simple manufacturing and processing, low cost and the like.
Description
Technical field
The present invention relates to a kind of radar antenna, especially relate to double frequency ground exploring radar antenna in a kind of hole.
Background technology
In recent years, the deep exploitation of city function is progressively transferred to and extensive, profound development and utilization is carried out to the underground space, as track traffic hub station, across rivers Important Project and the skyscraper underground space etc.In the construction of underground works, foundation pit enclosure structure is the crucial carrier ensureing underground works safety and environment safety, but it is increasingly sophisticated owing to going along with sb. to guard him type, working procedure is complicated, work quality is difficult to control, adding many unpredictalbe unfavorable factors such as geological condition is changeable, the quality of foundation pit enclosure structure will can be had influence on to a great extent.Often there is the major quality diseases such as cavity, folder mud, crack, segregation and building enclosure curtailment in building enclosure, cause building enclosure in excavation of foundation pit, occur percolating water, quicksand, support cracking, even there is water sudden soil flooding in foundation ditch, foundation ditch subsides equivalent risk event, badly influence the safety of the surrounding enviroment such as the safety of foundation ditch itself and periphery subway, tunnel, underground utilities and buildings or structures.But the method unripe at present to the detection of building enclosure disease, mostly existing method is the technology and the equipment that utilize existing pile measurement or geological prospecting, and lack specific aim, therefore Detection results cannot ensure.
The degree of depth of the usual insert into stratum of building enclosure is comparatively large, and therefore, carry out examination of explore ground radar in hole by the preformed hole in building enclosure is all comparatively feasible scheme in theory and practice.Antenna, as one of the core component of ground penetrating radar, plays vital effect to the enforcement of testing.But in current existing business hole, ground exploring radar antenna is used for geologic survey field, and antenna frequencies is lower, size is comparatively large, and resolving power is lower, cannot meet the demand of building enclosure Defect inspection.Therefore, urgently develop and be a kind ofly applicable to ground exploring radar antenna in the Novel hole of building enclosure Defect inspection, possess following characteristic:
1, operating frequency.According to the size characteristics of building enclosure and disease, require that electromagnetic wave can penetrate certain distance in building enclosure inside, the disease of certain size can be told again.According to engineering practice, antenna needs there is good service behaviour in 200MHz ~ 500MHz frequency range.
2, antenna gain.High-gain enables the input power concentrated radiation of antenna in the scope of required detection, effectively can increase the investigation depth of ground penetrating radar, more effectively can detect the disease of building enclosure inside.
3, antenna size.Due to building enclosure reserving standard-sized deviational survey hole usually, therefore antenna size is strictly limited by the size of hole.
The patent No. is that the Chinese patent of CN102354794B discloses a kind of down-hole geology detecting thunder large omnidirectional cylindricality dipole antenna, this antenna comprises: by the tubular cylinder of monopole antenna, conical antenna head, be located at the loading resistor between aerial head to antenna section and between each antenna section in both ends of the surface bore and corresponding compression spring, internode fixed cover, stay pipe, the monopole antenna of nut sleeve composition, be connected and fixed cover, coaxial cable, the centre frequency of this antenna is only 100MHz, and can not frequency conversion, limit investigative range, complex structure, cost is higher, and volume is larger, can only down-hole be applicable to and can not foundation pit enclosure structure be applicable to.
Summary of the invention
Object of the present invention be exactly provide that a kind of centre frequency is high, resolution is high, size is little, simple to operate, variable ratio frequency changer, the strength of materials are high, quality is light to overcome defect that above-mentioned prior art exists, make processing simply, double frequency ground exploring radar antenna in the low hole of cost.
Object of the present invention can be achieved through the following technical solutions:
Double frequency ground exploring radar antenna in a kind of hole, be arranged in the preformed hole of foundation pit enclosure structure, in order to detect the disease of foundation pit enclosure structure, the top antenna comprising sealing block at the bottom of sleeve pipe, pipe, pipe top sealing block, coaxial cable and be oppositely arranged on inside pipe casing extremely son and bottom antenna extremely sub, each antenna extremely son includes the conical antenna head, the first antenna section, frequency conversion joint and the second antenna section that connect successively, the conical antenna head that the head of described coaxial cable is extremely sub with each antenna is respectively connected, and afterbody is connected with pipe top sealing block.
Described frequency conversion joint is copper joint group or acrylic joint group.
The operating frequency of described ground exploring radar antenna is 200-500MHz, and when frequency conversion joint is copper joint group, centre frequency is 270MHz, and when frequency conversion joint is acrylic joint group, centre frequency is 500MHz.
Described copper joint group comprises the copper joint of separate type and the copper joint of integral type, described acrylic joint group comprises separate type acrylic joint and integral type acrylic joint, the copper joint of described integral type or integral type acrylic joint are arranged on bottom antenna extremely in son, and the copper joint of described separate type or separate type acrylic joint are arranged on top antenna extremely in son.
The outer rim of described frequency conversion joint is provided with external screw thread, and the first described antenna section and the second antenna section are respectively equipped with internal thread, and described frequency conversion joint is threaded connection with the first antenna section and the second antenna section respectively.
Described conical antenna head, the first antenna section and the second antenna section are copper, and conical antenna head is solid cone, and the first antenna section and the second antenna section are hollow cylinder.
Described pipe top sealing block is provided with the coaxial fitting be connected with coaxial cable, and described coaxial fitting is fixed by screws on the sealing block of pipe top.
The material of sealing block at the bottom of described sleeve pipe, pipe and pipe top sealing block is acrylic, the first antenna section and be filled with epoxy resin between the second antenna section and sleeve pipe.
The conical antenna head of the inner wire of described coaxial cable and bottom antenna extremely son weld, and the extremely sub conical antenna head of outer conductor and top antenna welds.
Described frequency conversion joint outer rim is also provided with snap ring.
Compared with prior art, the present invention has the following advantages:
One, centre frequency is high, resolution is high: the centre frequency of radar antenna of the present invention is 270MHz and 500MHz, is far longer than the centre frequency of antenna on the market, can adapt to the complicated geological environment of foundation pit enclosure structure especially.
Two, size is little: the present invention is the aperture in the reserved deviational survey hole adapted in foundation pit enclosure structure, and high 481mm, external diameter only has 60mm, can adapt to the aperture in reserved deviational survey hole completely.
Three, simple to operate, variable ratio frequency changer: only one group of frequency conversion joint need be backed out during frequency conversion, changing another group frequency conversion joint can change frequency, and structure is simple, easy to operate.
Four, the strength of materials is high, quality is light: sealing of the present invention and sleeve pipe use acrylic material, highly high, meet to the protection of antenna and seal request in operational environment, and quality is light, is easy to carry, change and durable.
Five, making processing is simple, cost is low: the structure of antenna and encapsulating material are all regular shapes, and it is common with material, and manufacturing procedure is few, is convenient to research and development improvement.
Accompanying drawing explanation
Fig. 1 is 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 integral 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, the 2, first antenna section, the 3, second antenna section, 4, frequency conversion joint, 5, coaxial cable, 6, sleeve pipe, 7, coaxial fitting, 8, sealing block at the bottom of pipe, 9, pipe top sealing block.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The object of this invention is to provide double frequency ground exploring radar antenna in a kind of hole, this antenna detects example according to difference, can work at centre frequency 270MHz and about 500MHz respectively, have 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, be arranged in the preformed hole of foundation pit enclosure structure, in order to detect the disease of foundation pit enclosure structure, comprise sleeve pipe 6, sealing block 8 at the bottom of pipe, pipe top sealing block 9, coaxial cable 5 and be oppositely arranged on sleeve pipe 6 inside top antenna extremely son and bottom antenna extremely sub, each antenna extremely son includes the conical antenna head 1 connected successively, first antenna section 2, frequency conversion joint 4 and the second antenna section 3, the conical antenna head 1 that the head of coaxial cable 5 is extremely sub with each antenna is respectively connected, afterbody is connected with pipe top sealing block 9.
The outer rim of frequency conversion joint 4 is provided with external screw thread, first antenna section 2 and the second antenna section 3 are respectively equipped with internal thread, frequency conversion joint 4 is threaded connection with the first antenna section 2 and the second antenna section 3 respectively, frequency conversion joint 4 outer rim is also provided with snap ring, conical antenna head 1, first antenna section 2 and the second antenna section 3 are copper, conical antenna head 1 is solid cone, first antenna section 2 and the second antenna section 3 are hollow cylinder, pipe top sealing block 9 is provided with the coaxial fitting 7 be connected with coaxial cable 5, coaxial fitting 7 is fixed by screws on pipe top sealing block 9, sleeve pipe 6, the material of sealing block 8 at the bottom of pipe and pipe top sealing block 9 is acrylic, first antenna section 2 and be filled with epoxy resin between the second antenna section 3 and sleeve pipe 6, the conical antenna head 1 that the inner wire of coaxial cable 5 is extremely sub with bottom antenna welds, outer conductor and top antenna extremely son conical antenna head 1 weld, first antenna section 2 can be connected with the second antenna section 3 by frequency conversion joint 4, thus increase antenna length to play the effect reducing antenna frequencies.
As shown in Figure 4, coaxial cable 5 by antenna one extremely in enter antenna, in conical antenna head 1 place and sky wire bonding, wherein inner wire and top conical shape aerial head tip is connected, outer conductor and bottom conical antenna head tip is connected, all the other current-carrying parts of coaxial cable all can not with sky linear contact lay.
As shown in Figures 2 and 3, frequency conversion joint 4 comprises separate type joint and integral joint, and wherein separate type joint is for connecting the extremely sub antenna section of top antenna, and integral joint is for connecting the extremely sub antenna section of bottom antenna.
When frequency conversion joint 4 is copper joint group, operating center frequency is 270MHz, copper joint group comprises the copper joint of separate type and the copper joint of integral type, and the copper joint of integral type is arranged on bottom antenna extremely in son, and the copper joint of separate type is arranged on top antenna extremely in son.
The concrete size of this antenna is as follows:
Conical antenna head 1 is cone, bores high 14mm, cone bottom diameter 48mm, and cone is holed along axis, aperture 2mm, the cone point distance 3mm of two conical antenna heads 1; First antenna section 2 is hollow cylinder, and height 110mm, external diameter 48mm, wall thickness 3mm, make internal thread at post tips, thread depth 20mm; Second antenna section 3 is hollow cylinder, and height 105mm, external diameter 48mm, wall thickness 3mm, make internal thread in cylinder front end, thread depth 20mm; Frequency conversion joint 4 is the bossed hollow cylinder in middle part, internal diameter 38mm, height 45mm, and wherein each 20mm altitude range is interior up and down makes external screw thread, external diameter 42mm, middle 5mm altitude range internal-and external diameter 48mm.Sleeve pipe 6 is acrylic pipe, height 481mm, external diameter 60mm, wall thickness 5mm; At the bottom of pipe, sealing block 8 is acrylic cylinder, height 5mm, diameter 48mm; Pipe top sealing block 9 is acrylic cylinder, and height 20mm, diameter 48mm, making diameter along cylinder axis is that the hole of 10mm is for installing coaxial fitting.
Embodiment 2:
When frequency conversion joint 4 is acrylic joint group, operating center frequency is 500MHz, acrylic joint group comprises separate type acrylic joint and integral type acrylic joint, integral type acrylic joint is arranged on bottom antenna extremely in son, separate type acrylic joint is arranged on top antenna extremely in son, and the remainder in the present embodiment is all identical with embodiment 1.
As shown in Figure 5, figure is return loss plot figure when using copper frequency conversion joint and acrylic frequency conversion joint respectively under numerical simulation condition, its centre frequency is respectively 270MHz and 500Mhz, return loss value reaches-23dB and-25dB respectively, illustrates that antenna has good service behaviour near these two frequencies.
Table 1 compares with the data of ordinary radar antenna for ground exploring radar antenna of the present invention, and from table, the present invention has that centre frequency is high, resolution is high, size is little, variable ratio frequency changer, quality are light, make that processing is simple, low cost and other advantages.
Table 1
| Size (mm) | Weight (kg) | Cost of manufacture | Resolution | Frequency conversion performance | |
| 100M | 1300x50 | 5.2 | Higher | Lower | Can not frequency conversion |
| 270/500M | 481x60 | 1.5 | Lower | Higher | Variable ratio frequency changer |
Claims (10)
1. double frequency ground exploring radar antenna in a hole, be arranged in the preformed hole of foundation pit enclosure structure, in order to detect the disease of foundation pit enclosure structure, it is characterized in that, comprise sleeve pipe (6), sealing block at the bottom of pipe (8), pipe top sealing block (9), coaxial cable (5) and be oppositely arranged on the inner top antenna of sleeve pipe (6) extremely son and bottom antenna extremely sub, each antenna extremely son includes the conical antenna head (1) connected successively, first antenna section (2), frequency conversion joint (4) and the second antenna section (3), the conical antenna head (1) that the head of described coaxial cable (5) is extremely sub with each antenna is respectively connected, afterbody is connected with pipe top sealing block (9).
2. double frequency ground exploring radar antenna in a kind of hole according to claim 1, is characterized in that, described frequency conversion joint (4) is copper joint group or acrylic joint group.
3. double frequency ground exploring radar antenna in a kind of hole according to claim 2, it is characterized in that, the operating frequency of described ground exploring radar antenna is 200-500MHz, when frequency conversion joint (4) is for copper joint group, centre frequency is 270MHz, when frequency conversion joint (4) is for acrylic joint group, centre frequency is 500MHz.
4. double frequency ground exploring radar antenna in a kind of hole according to claim 2, it is characterized in that, described copper joint group comprises the copper joint of separate type and the copper joint of integral type, described acrylic joint group comprises separate type acrylic joint and integral type acrylic joint, the copper joint of described integral type or integral type acrylic joint are arranged on bottom antenna extremely in son, and the copper joint of described separate type or separate type acrylic joint are arranged on top antenna extremely in son.
5. double frequency ground exploring radar antenna in a kind of hole according to claim 1, it is characterized in that, the outer rim of described frequency conversion joint (4) is provided with external screw thread, described the first antenna section (2) and the second antenna section (3) are respectively equipped with internal thread, and described frequency conversion joint (4) is threaded connection with the first antenna section (2) and the second antenna section (3) respectively.
6. double frequency ground exploring radar antenna in a kind of hole according to claim 1, it is characterized in that, described conical antenna head (1), the first antenna section (2) and the second antenna section (3) are copper, conical antenna head (1) is solid cone, and the first antenna section (2) and the second antenna section (3) are hollow cylinder.
7. double frequency ground exploring radar antenna in a kind of hole according to claim 1, it is characterized in that, described pipe top sealing block (9) is provided with the coaxial fitting (7) be connected with coaxial cable (5), and described coaxial fitting (7) is fixed by screws on pipe top sealing block (9).
8. double frequency ground exploring radar antenna in a kind of hole according to claim 1, it is characterized in that, at the bottom of described sleeve pipe (6), pipe, the material on sealing block (8) and pipe top sealing block (9) is acrylic, the first antenna section (2) and be filled with epoxy resin between the second antenna section (3) and sleeve pipe (6).
9. double frequency ground exploring radar antenna in a kind of hole according to claim 1, it is characterized in that, the conical antenna head of the inner wire of described coaxial cable (5) and bottom antenna extremely son weld, and the extremely sub conical antenna head of outer conductor and top antenna welds.
10. double frequency ground exploring radar antenna in a kind of hole according to claim 1, is characterized in that, described frequency conversion joint (4) outer rim is also provided with snap ring.
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 |
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| Publication Number | Publication Date |
|---|---|
| CN104810626A true CN104810626A (en) | 2015-07-29 |
| CN104810626B 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305063A (en) * | 2015-10-12 | 2016-02-03 | 国网上海市电力公司 | Pipeline radar antenna used for power cable pipe damage detection |
| CN114696071A (en) * | 2020-12-28 | 2022-07-01 | 电连技术股份有限公司 | High-gain broadband sucker antenna |
| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305063A (en) * | 2015-10-12 | 2016-02-03 | 国网上海市电力公司 | Pipeline radar antenna used for power cable pipe damage detection |
| 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 |
| CN114696071A (en) * | 2020-12-28 | 2022-07-01 | 电连技术股份有限公司 | High-gain broadband sucker antenna |
| 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 |
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| CN104810626B (en) | 2017-12-15 |
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