CN113514871A - Vehicle-mounted landmine acoustic vibration mode measurement device and method - Google Patents
Vehicle-mounted landmine acoustic vibration mode measurement device and method Download PDFInfo
- Publication number
- CN113514871A CN113514871A CN202110695390.9A CN202110695390A CN113514871A CN 113514871 A CN113514871 A CN 113514871A CN 202110695390 A CN202110695390 A CN 202110695390A CN 113514871 A CN113514871 A CN 113514871A
- Authority
- CN
- China
- Prior art keywords
- front vehicle
- guide rail
- mine
- mixing
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005259 measurement Methods 0.000 title claims abstract description 16
- 238000012545 processing Methods 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 6
- 238000002372 labelling Methods 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 238000005316 response function Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241000282472 Canis lupus familiaris Species 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 241000257303 Hymenoptera Species 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a vehicle-mounted landmine sound vibration modal measurement device and a method, wherein the device comprises an instrument carrying vehicle, a landmine modal measurement system and a data processing system, wherein the instrument carrying vehicle consists of a carrying platform and a brake universal wheel; the landmine modal measurement system consists of a landmine to be measured, a laser self-mixing vibration meter, a laser self-mixing controller, a laser self-mixing cradle head, a force hammer and a data acquisition card, and is used for realizing the measurement of the landmine modal to be measured; the data processing system consists of a computer host and a display and is used for processing data collected by the data acquisition card and generating a mode vibration pattern diagram of the mine to be detected; the method comprises the following specific implementation steps: 1) knocking points which are marked in advance on the mine to be detected and distributed in a circumferential radial manner by using a force hammer; 2) and analyzing and processing the acquired data of each point by SAMURAI software to obtain a vibration pattern diagram of the mine to be detected. The invention can realize the measurement of the landmine mode on the mobile platform.
Description
Technical Field
The invention relates to the field of shallow underground buried object detection, in particular to a vehicle-mounted landmine acoustic vibration mode measuring device and method.
Background
Until now, it is a worldwide problem to safely and reliably detect non-metal mines such as plastics. The conventional common metal mine detectors based on the electromagnetic induction principle can only detect metal mines, and have poor detection effect on non-metal mines such as plastic mines, so that the false alarm rate is high in the actual detection process; in the actual detection process, the buried objects are difficult to distinguish as mines or rocks, bricks or other fragments by imaging mine detection technologies based on infrared, ground penetrating radar and the like; in addition, there are also biological mine exploring methods based on non-imaging technology, such as mine exploring bees, mine exploring dogs, mine exploring grass and the like, but these methods require special biological species, have long cultivation period, are difficult to complete large-scale mine exploring tasks, and have relatively low mine exploring efficiency.
The acoustic resonance mine detection technology is a detection method based on mechanical characteristics of mines, and shows a good detection prospect. The geometrical size and the general burial depth of the mine determine that the resonance frequency of a resonance system formed by the mine and the buried soil above the mine is in a low frequency band, and under the condition that the resonance system formed by the mine and the soil above the mine is excited by sound waves and resonates, the vibration of a mine body cover of the mine can present a specific vibration mode and influence a specific vibration state of the ground surface. Therefore, the multi-mode vibration mode of the mine can be detected to be used for research of sound wave identification of the buried mine;
at present, a systematized or special device and a method for measuring the mode vibration of the mine are lacked, how to effectively detect the mine by using the sound vibration characteristic of the mine is utilized, so that the detection efficiency is improved, the key problem to be solved in the modern international mine clearance industry is solved, and the invention is developed aiming at the key technology.
Disclosure of Invention
The invention aims to overcome the problem that no special device and method for measuring the mine modal vibration mode are available at present, and provides a vehicle-mounted device and method for measuring the mine acoustic vibration mode, which can realize the measurement of the mine modal.
In order to achieve the purpose, the invention adopts the following technical scheme:
a vehicle-mounted landmine sound vibration mode measuring device comprises an instrument carrying vehicle, a landmine mode measuring system and a data processing system.
The instrument carrying vehicle comprises a front vehicle side plate a, a force hammer placing groove, a front vehicle plate supporting frame a, a front vehicle plate supporting frame b, brake universal wheels, a to-be-tested mine placing plate, a vehicle front plate, a front vehicle plate supporting frame c, a front vehicle side plate b, a front vehicle plate supporting frame d, a front vehicle rear plate, an equipment placing plate, an instrument placing plate, a guide rail a, a slide block a, a guide rail b, a slide block c and a guide rail c, wherein the front vehicle side plate a, the front vehicle side plate b, the vehicle front plate and the front vehicle rear plate are fixed by the front vehicle plate supporting frame a, the front vehicle plate supporting frame b, the front vehicle plate supporting frame c and the front vehicle plate supporting frame d through bolts and nuts, and the brake universal wheels are installed at the bottoms of the four supporting frames; the force hammer placing groove is arranged at the bottom of the front vehicle rear plate, and two ends of the equipment placing plate and the instrument placing plate are respectively fixed on the front vehicle side plate a and the front vehicle side plate b; the guide rail a, the guide rail b and the guide rail c are installed on the front vehicle rear plate through bolts and nuts, wherein the guide rail a and the guide rail c are installed in parallel, and the guide rail b is installed between the guide rail a and the guide rail c through the sliding block b and the sliding block c.
The landmine modal measurement system consists of a landmine to be measured, a laser self-mixing vibration meter, a laser self-mixing controller, a laser self-mixing cradle head, a force hammer and a data acquisition card; the laser self-mixing vibration meter is arranged on the laser self-mixing cradle head through a wedge-shaped groove, and the laser self-mixing cradle head is arranged on the guide rail b through the sliding block a; the landmine to be tested is placed on the landmine placing plate to be tested on the ground, and the force hammer is placed on the force hammer placing groove.
The data processing system consists of a computer host and a display; the force hammer, the data acquisition card and the computer host are connected through data transmission lines, and the laser self-mixing vibration meter, the laser self-mixing controller and the computer host are connected through data transmission lines.
A vehicle-mounted landmine sound vibration mode measurement method comprises the following specific steps:
1) marking knocking force points on the surface and the side surface of the mine to be tested, wherein the knocking force points are distributed in a circumferential radial manner, the number of the knocking force points is n, n is a natural number, and the labeling sequence is anticlockwise;
2) installing the laser self-mixing vibration meter on the laser self-mixing holder, adjusting the positions of the sliding block b and the sliding block c on the guide rail a and the guide rail c to enable the laser self-mixing holder to move in the X direction, adjusting the position of the sliding block a on the guide rail b to enable the laser self-mixing holder to move in the Y direction, opening the laser self-mixing vibration meter to enable auxiliary collimation laser emitted by the laser self-mixing vibration meter to irradiate the center of the upper surface of the mine to be tested, waiting for automatic focusing of the mine to be tested, and if the focusing fails for a long time, adopting an artificial focusing mode to focus;
3) sequentially knocking by using the force hammer according to the sequence of the marks from the center of the upper surface of the mine to be detected, keeping the knocking force constant in the knocking process, recording data in the data acquisition card, and transmitting the data to the data processing system by a data transmission line;
4) and processing the acquired data of the knocking force points by using SAMURAI software, and establishing a multi-mode vibration mode of the mine to be detected.
Compared with the prior art, the invention has the following prominent substantive characteristics and remarkable advantages:
1) the device for measuring the modal vibration mode of the mine is integrated on the self-made trolley, is designed in a vehicle-mounted mode, and is convenient to measure at any time;
2) the side surface and the bottom surface of the mine body have small influence on the mode of the whole mine, so that the mode of the upper surface of the mine body is only measured and analyzed, and measuring points are reduced.
Drawings
Fig. 1 is a structural diagram 1 of a vehicle-mounted type mine sound vibration mode measuring device of the invention.
Fig. 2 is a structural diagram 2 of a vehicle-mounted type mine sound vibration mode measuring device of the invention.
Fig. 3 is a schematic diagram of a landmine mode measuring system of a vehicle-mounted landmine sound vibration mode measuring device of the invention.
Fig. 4 is a flow chart of a vehicular landmine acoustic vibration mode measurement method of the invention.
Detailed Description
The preferred embodiments of the present invention are discussed below in conjunction with the following figures:
as shown in fig. 1, 2 and 3, a vehicle-mounted type mine acoustic vibration modal measurement apparatus includes three subsystems, namely an instrument carrying vehicle 100, a mine modal measurement system 200 and a data processing system 300; the instrument carrying vehicle 100 is composed of a front vehicle side plate a101, a force hammer placing groove 102, a front vehicle plate supporting frame a103, a front vehicle plate supporting frame b104, a brake universal wheel 105, a to-be-tested mine placing plate 106, a vehicle front plate 107, a front vehicle plate supporting frame c108, a front vehicle side plate b109, a front vehicle plate supporting frame d110, a front vehicle rear plate 111, an equipment placing plate 112, an instrument placing plate 113, a guide rail a114, a slider a115, a guide rail b116, a slider b117, a slider c118 and a guide rail c119, wherein the front vehicle side plate a101, the front vehicle side plate b109, the vehicle front plate 107 and the front vehicle rear plate 111 are fixed by the front vehicle plate supporting frame a103, the front vehicle plate supporting frame b104, the front vehicle plate supporting frame c108 and the front vehicle plate supporting frame d110 through bolts and nuts, and universal brake wheels 105 are installed at the bottoms of the four supporting frames; the force hammer placing groove 102 is installed at the bottom of the front vehicle rear plate 111, and both ends of the equipment placing plate 112 and the instrument placing plate 113 are respectively fixed on the front vehicle side plate a101 and the front vehicle side plate b 109; the guide rail a114, the guide rail b116 and the guide rail c119 are mounted on the front vehicle rear plate 111 through bolts and nuts, wherein the guide rail a114 and the guide rail c119 are mounted in parallel, and the guide rail b116 is mounted between the guide rail a114 and the guide rail c119 through the slide block b117 and the slide block c 118; the landmine modal measurement system 200 is composed of a landmine 201 to be measured, a laser self-mixing vibration meter 202, a laser self-mixing controller 203, a laser self-mixing cradle head 204, a force hammer 205 and a data acquisition card 206; the laser self-mixing vibration meter 202 is mounted on the laser self-mixing pan-tilt 204 through a wedge-shaped groove, and the laser self-mixing pan-tilt 204 is mounted on the guide rail b116 through the sliding block a 115; the mine 201 to be tested is placed on the mine placing plate 106 to be tested on the ground, and the force hammer 205 is placed on the force hammer placing groove 102; the data processing system 300 is composed of a computer host 301 and a display 302; the hammer 205, the data acquisition card 206 and the host computer 301 are connected through data transmission lines, and the laser self-mixing vibration meter 202, the laser self-mixing controller 203 and the host computer 301 are connected through data transmission lines.
As shown in fig. 4, a vehicle-mounted method for measuring the sound vibration mode of the mine, using the above device, comprises the following steps:
1) marking knocking force points on the surface and the side face of the mine 201 to be tested, wherein the knocking force points are distributed in a circumferential radial manner, the number of the knocking force points is 128 in the embodiment, and the labeling sequence is anticlockwise;
2) installing the laser self-mixing vibration meter 202 on the laser self-mixing holder 204, adjusting the positions of the slide block b117 and the slide block c118 on the guide rail a114 and the guide rail c119 to enable the laser self-mixing holder 204 to move in the X direction, adjusting the position of the slide block a115 on the guide rail b116 to enable the laser self-mixing holder 204 to move in the Y direction, opening the laser self-mixing vibration meter 202 to enable auxiliary collimated laser emitted by the laser self-mixing vibration meter to irradiate the center of the upper surface of the mine 201 to be tested, waiting for automatic focusing, and if the long-time focusing fails, adopting an artificial focusing mode for focusing;
3) starting from the center of the upper surface of the mine 201 to be tested, using the force hammer 205 to knock sequentially according to the sequence of the labels, keeping the knocking force constant in the knocking process, recording data in the data acquisition card 206, and transmitting the data to the data processing system 300 through a data transmission line;
4) and processing the acquired data of the knocking force points by using SAMURAI software, and establishing a multi-mode vibration mode of the mine 201 to be detected.
In the process of measuring the landmine mode, knocking points at different positions can show different frequency response functions, and in the concerned bandwidth range, compared with a normal frequency response function, some knocking points can show a phenomenon of lacking a certain order of resonance frequency, so that the phenomenon is caused because the point is at the node position of the order mode, and no resonance frequency is generated; the type of the land mine selected in the embodiment is a plastic shell land mine, the number of the knocking points is 128, and for the same land mine, if the number of the knocking points is set to be 91 (the arrangement mode is still circumferential and radial), the more the number of the knocking points is, the more the influence of the nodes can be avoided, so that the modal vibration type of the land mine is more detailed and more consistent with the measurement requirement.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the embodiments, and various changes and modifications can be made according to the purpose of the invention, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention shall be equivalent substitutions, as long as the purpose of the present invention is met, and the present invention shall fall within the protection scope of the present invention without departing from the technical principle and inventive concept of the present invention.
Claims (2)
1. A vehicle-mounted landmine sound vibration mode measurement device is characterized by comprising three subsystems, namely an instrument carrying vehicle (100), a landmine mode measurement system (200) and a data processing system (300); the instrument carrying vehicle (100) consists of a front vehicle side plate a (101), a force hammer placing groove (102), a front vehicle plate supporting frame a (103), a front vehicle plate supporting frame b (104), a brake universal wheel (105), a mine placing plate to be tested (106), a vehicle front plate (107), a front vehicle plate supporting frame c (108), a front vehicle side plate b (109), a front vehicle plate supporting frame d (110), a front vehicle rear plate (111), an equipment placing plate (112), an instrument placing plate (113), a guide rail a (114), a slide block a (115), a guide rail b (116), a slide block b (117), a slide block c (118) and a guide rail c (119), wherein the front vehicle side plate a (101), the front vehicle side plate b (109), the vehicle front plate (107) and the front vehicle rear plate (111) are fixed by bolts and nuts through the front vehicle plate supporting frame a (103), the front vehicle plate supporting frame b (104), the front vehicle plate supporting frame c (108) and the front vehicle plate supporting frame d (110), the bottom parts of the four support frames are provided with brake universal wheels (105); the force hammer placing groove (102) is installed at the bottom of a front vehicle rear plate (111), and two ends of an equipment placing plate (112) and an instrument placing plate (113) are respectively fixed on a front vehicle side plate a (101) and a front vehicle side plate b (109); the guide rail a (114), the guide rail b (116) and the guide rail c (119) are mounted on the front vehicle rear plate (111) through bolts and nuts, wherein the guide rail a (114) and the guide rail c (119) are mounted in parallel, and the guide rail b (116) is mounted between the guide rail a (114) and the guide rail c (119) through the slide block b (117) and the slide block c (118); the landmine modal measurement system (200) is composed of a landmine to be measured (201), a laser self-mixing vibration meter (202), a laser self-mixing controller (203), a laser self-mixing cradle head (204), a force hammer (205) and a data acquisition card (206); the laser self-mixing vibration meter (202) is mounted on the laser self-mixing pan-tilt (204) through a wedge-shaped groove, and the laser self-mixing pan-tilt (204) is mounted on the guide rail b (116) through the sliding block a (115); the mine to be tested (201) is placed on a mine placing plate (106) to be tested on the ground, and the force hammer (205) is placed on the force hammer placing groove (102); the data processing system (300) is composed of a computer host (301) and a display (302); the force hammer (205), the data acquisition card (206) and the computer host (301) are connected through data transmission lines, and the laser self-mixing vibration meter (202), the laser self-mixing controller (203) and the computer host (301) are connected through data transmission lines.
2. A vehicle-mounted landmine sound vibration mode measurement method is characterized by comprising the following specific steps:
1) marking knocking force points on the surface and the side face of the mine (201) to be tested, wherein the knocking force points are distributed in a circumferential radial manner, the number of the knocking force points is n, n is a natural number, and the labeling sequence is anticlockwise;
2) installing the laser self-mixing vibration meter (202) on the laser self-mixing cloud deck (204), adjusting the positions of the slide block b (117) and the slide block c (118) on the guide rail a (114) and the guide rail c (119) to enable the laser self-mixing cloud deck (204) to move in the X direction, adjusting the position of the slide block a (115) on the guide rail b (116) to enable the laser self-mixing cloud deck (204) to move in the Y direction, opening the laser self-mixing vibration meter (202), enabling auxiliary collimated laser emitted by the laser to irradiate the center of the upper surface of the mine (201) to be measured, waiting for automatic focusing of the mine, and adopting an artificial focusing mode for focusing if long-time focusing fails;
3) starting from the center of the upper surface of the mine (201) to be detected, sequentially knocking by using the force hammer (205) according to a label sequence, keeping the knocking force constant in the knocking process, recording data in the data acquisition card (206), and transmitting the data to the data processing system (300) by a data transmission line;
4) and processing the acquired data of the knocking force points by using SAMURAI software, and establishing a multi-mode vibration mode of the mine (201) to be detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110695390.9A CN113514871A (en) | 2021-06-23 | 2021-06-23 | Vehicle-mounted landmine acoustic vibration mode measurement device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110695390.9A CN113514871A (en) | 2021-06-23 | 2021-06-23 | Vehicle-mounted landmine acoustic vibration mode measurement device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113514871A true CN113514871A (en) | 2021-10-19 |
Family
ID=78066010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110695390.9A Pending CN113514871A (en) | 2021-06-23 | 2021-06-23 | Vehicle-mounted landmine acoustic vibration mode measurement device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113514871A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201011250A (en) * | 2008-09-09 | 2010-03-16 | Univ Nat Chunghsing | Intelligent landmine scanning vehicle |
| US8240239B1 (en) * | 2011-07-16 | 2012-08-14 | Kevin Mark Diaz | Green energy mine defeat system |
| CN103994814A (en) * | 2014-05-12 | 2014-08-20 | 上海大学 | Landmine multi-modal vibration mode measurement device and method |
| CN110133098A (en) * | 2019-04-02 | 2019-08-16 | 中国人民解放军63983部队 | A kind of high precision measuring device and measurement method of land mine sound vibration characteristic |
| CN111445522A (en) * | 2020-03-11 | 2020-07-24 | 上海大学 | Passive night-vision intelligent mine detection system and intelligent mine detection method |
| CN212963040U (en) * | 2020-06-28 | 2021-04-13 | 陈良 | Mine detection and removal engineering vehicle |
-
2021
- 2021-06-23 CN CN202110695390.9A patent/CN113514871A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201011250A (en) * | 2008-09-09 | 2010-03-16 | Univ Nat Chunghsing | Intelligent landmine scanning vehicle |
| US8240239B1 (en) * | 2011-07-16 | 2012-08-14 | Kevin Mark Diaz | Green energy mine defeat system |
| CN103994814A (en) * | 2014-05-12 | 2014-08-20 | 上海大学 | Landmine multi-modal vibration mode measurement device and method |
| CN110133098A (en) * | 2019-04-02 | 2019-08-16 | 中国人民解放军63983部队 | A kind of high precision measuring device and measurement method of land mine sound vibration characteristic |
| CN111445522A (en) * | 2020-03-11 | 2020-07-24 | 上海大学 | Passive night-vision intelligent mine detection system and intelligent mine detection method |
| CN212963040U (en) * | 2020-06-28 | 2021-04-13 | 陈良 | Mine detection and removal engineering vehicle |
Non-Patent Citations (2)
| Title |
|---|
| WANG CHI ET AL.: "Method for Detecting Multi-Modal Vibration Characteristics of Landmines", 《INSTRUMENTATION》 * |
| 王驰等: "激光自混合测振技术在声共振探雷实验中的应用", 《光学精密仪器》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104597506B (en) | The air-ground electromagnetic exploration method of frequency domain | |
| CN102607477B (en) | Full-face vehicular detection method for railway tunnel lining and device | |
| CN100395547C (en) | System for testing quality of cast in place concrete pile | |
| CN101246216A (en) | High-speed laser ranging system including a fiber laser | |
| CN108286654B (en) | Pipeline inspection device and method | |
| WO2010142165A1 (en) | Seismic sensor array device and method for data collecting thereof | |
| CN103994814B (en) | The multi-modal vibration shape measurement mechanism of land mine and measuring method | |
| CN101685062B (en) | Pipeline reducing diameter detecting device | |
| US9651341B2 (en) | System for the detection and classification of buried unexploded ordnance | |
| EP1130355A3 (en) | Target, surveying system and surveying method | |
| CN109814161B (en) | Aviation magnetic resonance underground water detection device and method | |
| CN105676000A (en) | Transmission-type CT ground penetrating radar-based measurement method for measuring soil relative dielectric constant | |
| CN104035137A (en) | Underground full-space transient electromagnetic detecting instrument and detection method | |
| CN110865371A (en) | Be used for ground penetrating radar device under water | |
| CN107703538A (en) | Underground unfavorable geology survey data acquisition analysis system and method | |
| CN113514871A (en) | Vehicle-mounted landmine acoustic vibration mode measurement device and method | |
| JPH0933194A (en) | Mine detection system | |
| CN103017888B (en) | Landmine inherent frequency acousto-optic measurement device and method | |
| CN103018767A (en) | Acousto-optical detection device and method for shallow buried objects | |
| CN103376443B (en) | Ground penetrating radar terrestrial interference detecting and fast eliminating method | |
| CN202599370U (en) | Full-section vehicle-mounted detection apparatus for railway tunnel lining | |
| CN105865612A (en) | Power transmission line galloping traction monitoring system and method based on ultrasonic transducer | |
| CN114877986A (en) | External damage prevention monitoring and early warning system based on distributed optical fiber vibration sensing technology | |
| CN113391344A (en) | Coral reef area karst cave detection system and method | |
| CN109669186B (en) | Acoustic-magnetic combined measurement system and method for underwater navigation body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211019 |