CN107807350B - Test calibration system for measuring vertical micro-deformation and calibration method thereof - Google Patents
Test calibration system for measuring vertical micro-deformation and calibration method thereof Download PDFInfo
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- CN107807350B CN107807350B CN201710894123.8A CN201710894123A CN107807350B CN 107807350 B CN107807350 B CN 107807350B CN 201710894123 A CN201710894123 A CN 201710894123A CN 107807350 B CN107807350 B CN 107807350B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/497—Means for monitoring or calibrating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a test calibration system for measuring vertical micro-deformation, which comprises a transmitting device for transmitting a measuring signal and receiving a reflected signal, a reflecting device which is arranged opposite to the transmitting device and is used for reflecting the measuring signal, and a flame generating device which is arranged between the transmitting device and the reflecting device and is used for generating a smoke and fire interference measuring signal; the reflecting device comprises a supporting frame, a vertical adjusting base arranged on the supporting frame and a reflector arranged on the vertical adjusting base. According to the invention, the deformation of a building under the fire condition is simulated by adjusting the displacement of the reflector through the vertical adjusting base, the flame, the high-temperature smoke and the smoke particles under the fire condition are simulated by generating smoke and fire through the flame generating device, the influence of the flame, the high-temperature smoke and the smoke particles under the fire condition on the measurement is finally determined through the analysis of the recorded measurement data through the recording measurement of a plurality of groups of data. The invention also provides a calibration method of the calibration test system.
Description
Technical Field
The invention relates to the field of micro-deformation displacement test calibration, in particular to a test calibration system for measuring vertical micro-deformation and a calibration method thereof.
Background
Along with the development of society, people have higher and higher requirements on monitoring vibration and deformation of large and high-rise buildings, and particularly, the real-time performance and non-contact performance of building collapse monitoring and early warning in fire disaster are very high. At the same time, however, conventional measuring means have not been able to meet the requirements of deformation monitoring well due to the ever increasing volume and height of the building. In recent years, microwave interferometry technology has become one of means for non-contact deformation monitoring of large and high-rise buildings by virtue of its unique advantages such as non-contact property and real-time property. In addition, the technical means based on laser ranging such as a laser total station and the like are widely applied in the measuring field.
When a fire disaster occurs, smoke and high temperature generated by a fire scene and fire burn building components to destroy the building structure, so that the building is deformed to a certain extent, and the building collapses to a certain extent, which seriously threatens the life safety of fire rescue workers in the fire scene. The non-contact equipment such as micro-deformation radar monitoring system, laser total station can carry out real-time measurement to it, but can produce flame and high temperature flue gas in certain limit after the conflagration takes place, and because the kind of building combustion medium is complicated and the burning is incomplete, there is the cigarette particulate matter in addition, flame, high temperature flue gas, cigarette particulate matter has to measure to influence, this just needs to carry out micro-deformation displacement calibration test and verifies, and the deformation of building element can decompose into horizontal deformation and vertical deformation during the conflagration, consequently, just can design a test calibration system that is used for verifying whether flame, high temperature flue gas, cigarette particulate matter have to influence to vertical micro-deformation displacement measurement.
In summary, how to design an experimental calibration system for measuring the micro-deformation displacement effectively meeting the requirement is one of the problems to be solved by those skilled in the art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a test calibration system for measuring the vertical micro-deformation.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a test calibration system for measuring vertical micro-deformation comprises a transmitting device for transmitting a measuring signal and receiving a reflected signal, a reflecting device which is arranged opposite to the transmitting device and is used for reflecting the measuring signal, and a flame generating device which is arranged between the transmitting device and the reflecting device and is used for generating a pyrotechnic disturbance measuring signal; the reflecting device comprises a supporting frame, a vertical adjusting base arranged on the supporting frame and a reflector arranged on the vertical adjusting base; the vertical adjusting base comprises a fixed base arranged on the supporting frame, a movable base which is connected with the fixed base and can rotate by taking a joint as an axis, a chute fixing part fixedly connected with the movable base, an installation part connected with the chute fixing part, an adjusting mechanism arranged on the side surface of the chute fixing part, and an angle adjusting mechanism which is connected with the fixed base and the movable base and is used for controlling the movable base to rotate; the installation department is used for installing the reflector, spout fixed part is provided with the spout, the installation department is provided with the ridge that matches with spout assorted, adjustment mechanism is used for controlling the installation department and removes along the spout.
Specifically, the angle adjusting mechanism comprises a first connecting block fixedly connected with the movable base, a second connecting block fixedly connected with the fixed base, a connecting screw rod for connecting the first connecting block and the second connecting block, and a first adjusting nut, a second adjusting nut and a third adjusting nut which are arranged on the connecting screw rod; the connecting screw rod is provided with a stop block for preventing the connecting screw rod from falling out of the first connecting block through hole at one side of the first connecting block, the first adjusting nut and the second adjusting nut are sequentially arranged between the first connecting block and the second connecting block, and the third adjusting nut is located on one side of the second connecting block far away from the first connecting block.
Specifically, the adjusting mechanism is an adjusting rod, transmission threads matched with each other are arranged on the convex ridge and at the end part of the adjusting rod, the adjusting rod is combined with the transmission thread teeth on the convex ridge to be used for controlling the mounting part to move along the sliding groove, and the adjusting rod is provided with a locking switch.
Specifically, the mounting portion is provided with four mounting bolts for mounting the reflector.
Further, the side surface of the chute fixing part is provided with measurement scales, and the corresponding position of the installation part, where the chute fixing part is provided with the measurement scales, is provided with alignment scales.
Specifically, the fixed base is connected with the movable base through a shaft pin structure, the sliding groove is a dovetail groove, a connecting plate is arranged between the movable base and the sliding groove fixing portion, the sliding groove fixing portion is fixedly connected with the connecting plate, and the movable base is fixedly connected with the connecting plate through a bolt.
Preferably, the reflector is a corner reflector.
Specifically, the transmitting device is one of a radar transmitting device and a laser ranging device.
Specifically, the support frame is a tripod.
Based on the foregoing, the invention also provides a calibration method of the test calibration system for measuring the vertical micro-deformation, comprising the following steps:
(1) Setting the emitting device and the reflecting device in opposite directions at a certain distance of 0-500 m, and adjusting the emitting surface of the emitting device and the reflector to the same horizontal height;
(2) Starting calibration of a test system under the smokeless fire state, synchronously recording and collecting initial data under the smokeless fire state at the transmitting device and the reflecting device, regulating the displacement of the reflector through a regulating rod, and synchronously recording and collecting horizontal displacement data of the reflector at the transmitting device and the reflecting device;
(3) Comparing the analysis data, and adjusting the test equipment according to the comparison analysis result until the calibration of the test system in a smokeless state is completed;
(4) A flame generating device is arranged between the transmitting device and the reflecting device, and the flame generating device is started to generate interference smoke and fire;
(5) Synchronously recording and collecting initial data in a pyrotechnic state at the transmitting device and the reflecting device, regulating the displacement of the reflector through a regulating rod, and synchronously recording and collecting displacement data of the reflector in the pyrotechnic state at the transmitting device and the reflecting device;
(6) And (5) repeatedly recording and collecting multiple groups of displacement data of different displacements of the reflector under the pyrotechnic state.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the vertical adjusting base is arranged, the reflector is adjusted to displace through the vertical adjusting base to simulate the deformation of a building under the fire condition, the flame generating device is arranged between the transmitting device and the reflecting device, the flame generating device is used for generating smoke to simulate the flame, high-temperature smoke and smoke particles under the fire condition, the record and measurement of a plurality of groups of data are adopted, and finally the influence of the flame, the high-temperature smoke and the smoke particles under the fire condition on the measurement is determined through the analysis of the recorded measurement data.
According to the vertical adjusting base, the sliding groove is formed in the sliding groove fixing part, the installation part is arranged on the sliding groove fixing part through the convex ridge, the transmission threads are formed in the convex ridge, the installation part is controlled to move along the sliding groove through being meshed with the transmission threads at the end part of the adjusting rod, the locking switch is arranged on the adjusting rod, and the locking switch is locked after the installation part is adjusted to move, so that the installation part is kept at the set displacement and cannot automatically slide in the sliding groove; the sliding groove is a dovetail groove, so that the mounting part can be effectively prevented from falling out of the sliding groove; the measuring scale on the side surface of the chute fixing part is matched with the alignment scale of the mounting part, so that the displacement of the mounting part along the chute can be accurately regulated, and the displacement data is convenient to read and record; the movable base is rotatable by taking the joint as an axis, so that the reflecting mechanism arranged on the mounting part can conveniently adjust the angle in the vertical direction; the angle adjusting mechanism is characterized in that the connecting screw and the first adjusting nut, the second adjusting nut and the third adjusting nut are arranged, the first adjusting nut and the second adjusting nut are sequentially arranged between the first connecting block and the second connecting block, the third adjusting nut is located on one side, away from the first connecting block, of the second connecting block, and therefore after the vertical angle of the movable base is adjusted, the movable base can be kept at the adjusted angle by screwing the first adjusting nut, the second adjusting nut and the third adjusting nut to proper positions.
The reflector is a corner reflector and has an enhancement effect on reflected radar signals when the radar transmitting device is used.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic view of a reflecting device according to the present invention.
Fig. 3 is a schematic view of a vertical adjustment base structure of the present invention.
Fig. 4 is a schematic view of a vertically adjustable base mounted reflector of the present invention.
Fig. 5 is a front view of a vertically adjustable base mounted reflector of the present invention.
Wherein, the names corresponding to the reference numerals are:
the device comprises a 1-emitting device, a 2-reflecting device, a 3-flame generating device, a 4-supporting frame, a 5-vertical adjusting base, a 6-reflector, a 7-fixed base, an 8-movable base, a 9-chute fixing part, a 10-mounting part, an 11-adjusting mechanism, a 12-ridge, a 13-first connecting block, a 14-second connecting block, a 15-connecting screw rod, a 16-first adjusting nut, a 17-second adjusting nut, a 18-third adjusting nut, a 19-mounting bolt and a 20-connecting plate.
Detailed Description
The invention will be further illustrated with reference to the following description and examples, embodiments of the invention including but not limited to the following examples.
As shown in fig. 1 to 5, a test calibration system for measuring vertical micro-deformation comprises a transmitting device 1, a reflecting device 2 and a flame generating device 3; the reflecting device 1 comprises a supporting frame 4, a vertical adjusting base 5 arranged on the supporting frame 4 and a reflector 6 arranged on the vertical adjusting base 5; the vertical adjusting base 5 comprises a fixed base 7 arranged on the supporting frame 4, a movable base 8 which is connected with the fixed base 7 and can rotate by taking the joint as an axis, a chute fixing part 9 fixedly connected with the movable base 8, an installation part 10 connected with the chute fixing part 9, an adjusting mechanism 11 arranged on the side surface of the chute fixing part 9, and an angle adjusting mechanism which is connected with the fixed base 7 and the movable base 8 and is used for controlling the movable base 8 to rotate; the angle adjusting mechanism comprises a first connecting block 13 fixedly connected with the movable base 8, a second connecting block 14 fixedly connected with the fixed base 7, a connecting screw rod 15 for connecting the first connecting block 13 and the second connecting block 14, and a first adjusting nut 16, a second adjusting nut 17 and a third adjusting nut 18 which are arranged on the connecting screw rod 15.
The transmitting device 1 is used for transmitting a measuring signal and receiving a reflected signal, the reflecting device 2 is arranged opposite to the transmitting device 1 and used for reflecting the measuring signal, and the flame generating device 3 is arranged between the transmitting device 1 and the reflecting device 2 and used for generating a smoke-fire interference measuring signal; the installation part 10 is used for installing the reflector 6, the chute fixing part 9 is provided with a chute, the installation part 10 is provided with a convex ridge 12 matched with the chute, the adjusting mechanism 11 is used for controlling the installation part 10 to move along the chute, the adjusting mechanism 11 is an adjusting rod, transmission threads matched with each other are arranged on the convex ridge 12 and the end part of the adjusting rod, the adjusting rod is combined with the transmission thread teeth on the convex ridge 12 and used for controlling the installation part 10 to move along the chute, and the adjusting rod is provided with a locking switch; the corresponding positions of the first connecting block 13 and the second connecting block 14 are provided with through holes matched with the connecting screw rods 15, the connecting screw rods 15 penetrate through the through holes and can move along the through holes, the end parts of the connecting screw rods 15 on one side of the first connecting block 13 are provided with stop blocks for preventing the connecting screw rods 15 from falling out of the through holes of the first connecting block 13, the first adjusting nuts 16 and the second adjusting nuts 17 are sequentially arranged between the first connecting block 13 and the second connecting block 14, and the third adjusting nuts 18 are positioned on one side of the second connecting block 14 far away from the first connecting block 13; the mounting part 10 is provided with four mounting bolts 19 for mounting the reflector 6; the side surface of the chute fixing part 9 is provided with measurement scales, and the mounting part 10 is provided with alignment scales at the corresponding positions of the chute fixing part 9 where the measurement scales are arranged; the fixed base 7 and the movable base 8 are connected through a shaft pin structure, and the sliding groove is a dovetail groove; a connecting plate 20 is arranged between the movable base 8 and the chute fixing part 9, the chute fixing part 9 is fixedly connected with the connecting plate 20, and the movable base 8 is fixedly connected with the connecting plate 20 through bolts; the reflector 6 is a corner reflector; the transmitting device 1 is a radar transmitting device, two radar transmitting devices with different beam angles are adopted, the radar beam angles are respectively 3-5 degrees and 30 degrees, and the radar transmitting device is complete equipment with a data acquisition computer; the flame generating device 3 is an oil pan, the size of the oil pan is 50cm, the fuel is n-heptane; the support frame is a tripod.
The calibration method of the calibration test system for measuring the micro-deformation displacement comprises the following steps:
(1) The radar transmitting device and the reflecting device 2 are arranged in opposite directions at a certain distance, the interval distance is 0-500 m, and the radar transmitting surface of the radar transmitting device and the corner reflector are adjusted to the same horizontal height;
(2) Starting calibration of a test system under the smokeless fire state, synchronously recording and collecting initial data under the smokeless fire state at the ends of the radar transmitting device and the reflecting device 2, regulating displacement of the corner reflectors by regulating rods, and synchronously recording and collecting displacement data of the corner reflectors at the ends of the radar transmitting device and the reflecting device 2;
(3) Comparing the analysis data, and adjusting the test equipment according to the comparison analysis result until the calibration of the test system in a smokeless state is completed;
(4) Placing an oil pan between the radar transmitting means and the reflecting means 2 and igniting the oil pan to generate interfering smoke and fire;
(5) Initial data in a pyrotechnic state is synchronously recorded and collected at two ends of the radar transmitting device and the reflecting device 2, the displacement of the corner reflector is regulated by the regulating rod, and then displacement data of the corner reflector in the pyrotechnic state is synchronously recorded and collected at two ends of the radar transmitting device and the reflecting device 2;
(6) And (5) repeatedly recording and collecting multiple groups of displacement data of different displacements of the corner reflector under the pyrotechnic state.
The radar transmitting devices with two beam angles are used for calibration test, so that equipment errors can be eliminated better, the measuring effect of radar waves with different beam ranges can be verified, the transmitting devices can also adopt laser ranging devices, and when the laser ranging devices are adopted, the reflectors can be common flat reflectors. The radar emitting surface and the corner reflector of the radar emitting device are required to be at the same horizontal height, if not at the same horizontal height, an angle between the radar emitting surface and the corner reflector can be measured by an angle measuring instrument, and then the angle is converted into a horizontal component; radar measures the displacement of a target in its radial direction, while many of the indicators of a building structure in a fire are horizontal and vertical components, which need to be scaled. It should be noted that the radar measures the target at t n+1 And t n The amount of displacement change between moments in time, not the absolute value. During synchronous measurement, 1 person is respectively at each station at both ends of the transmitting device and the reflecting device, 1 person is respectively held by the stopwatch, and data are synchronously recorded and collected. If the flame height is lower during the test, no obvious interference is formed between the transmitting device and the reflecting device, the oil pan can be enlarged, the test can be performed in the environment without wind interference as much as possible, the calibration test can be performed in a tunnel or indoors if necessary, and the flame generating device can also take other forms.
When the vertical adjusting base 5 is used, the mounting part 10 is controlled to move up and down in the chute of the chute fixing part 9 through the adjusting rod, so that the displacement of the corner reflector in the vertical direction is controlled, when the angle of the corner reflector in the vertical direction needs to be adjusted, the movable base 8 can be kept at the angle required by the calibration test by adjusting the third adjusting nut 18 to the corresponding position, then adjusting the second adjusting nut 17 to clamp the second connecting block 14, and then adjusting the first adjusting nut 16 to abut against the first connecting block 13.
The working principle of the invention is as follows: the vertical displacement and the vertical direction angle of the reflector are regulated through the vertical regulating base to simulate the deformation of a building under the condition of fire, and the flame generating device generates smoke to simulate flame, high-temperature smoke and smoke particles under the condition of fire; the test system is calibrated under the state of no smoke, the system is ensured to be normal, displacement data represented by a reflected signal received by the transmitting device under the state of smoke and fire are compared with displacement data read by measuring scales on the multi-side adjusting base of the reflecting device, if the two data are consistent, the fire is indicated to have no influence on a measuring result, if the two data are inconsistent, the fire is indicated to have influence on the measuring result, the influence of measuring errors is eliminated through the comparison analysis of multiple groups of data, and the purpose of calibration test is achieved.
The above embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, and all the modifications or color changes that are not significant in the spirit and scope of the main body design of the present invention are still consistent with the present invention.
Claims (8)
1. The test calibration system for measuring the vertical micro-deformation is characterized by comprising a transmitting device (1) for transmitting a measuring signal and receiving a reflected signal, a reflecting device (2) which is arranged opposite to the transmitting device and is used for reflecting the measuring signal, and a flame generating device (3) which is arranged between the transmitting device and the reflecting device and is used for generating a pyrotechnic interference measuring signal; the reflecting device comprises a supporting frame (4), a vertical adjusting base (5) arranged on the supporting frame and a reflector (6) arranged on the vertical adjusting base; the vertical adjusting base comprises a fixed base (7) arranged on the supporting frame, a movable base (8) connected with the fixed base and rotatable by taking a joint as an axis, a chute fixing part (9) fixedly connected with the movable base, an installing part (10) connected with the chute fixing part, an adjusting mechanism (11) arranged on the side surface of the chute fixing part, and an angle adjusting mechanism connected with the fixed base and the movable base and used for controlling the movable base to rotate; the installation part is used for installing the reflector, the chute fixing part is provided with a chute, the installation part is provided with a convex ridge (12) matched with the chute, and the adjusting mechanism is used for controlling the installation part to move along the chute;
the reflector is a corner reflector;
the calibration method of the calibration test system for measuring the micro-deformation displacement comprises the following steps:
(1) Setting the emitting device and the reflecting device in opposite directions at a certain distance of 0-500 m, and adjusting the emitting surface of the emitting device and the reflector to the same horizontal height;
(2) Starting calibration of a test system under the smokeless fire state, synchronously recording and collecting initial data under the smokeless fire state at the transmitting device and the reflecting device, regulating the displacement of the reflector through a regulating rod, and synchronously recording and collecting horizontal displacement data of the reflector at the transmitting device and the reflecting device;
(3) Comparing the analysis data, and adjusting the test equipment according to the comparison analysis result until the calibration of the test system in a smokeless state is completed;
(4) A flame generating device is arranged between the transmitting device and the reflecting device, and the flame generating device is started to generate interference smoke and fire;
(5) Synchronously recording and collecting initial data in a pyrotechnic state at the transmitting device and the reflecting device, regulating the displacement of the reflector through a regulating rod, and synchronously recording and collecting displacement data of the reflector in the pyrotechnic state at the transmitting device and the reflecting device;
(6) And (5) repeatedly recording and collecting multiple groups of displacement data of different displacements of the reflector under the pyrotechnic state.
2. The test calibration system for measuring vertical micro-deformation according to claim 1, wherein the angle adjusting mechanism comprises a first connecting block (13) fixedly connected with the movable base, a second connecting block (14) fixedly connected with the fixed base, a connecting screw (15) connecting the first connecting block and the second connecting block, and a first adjusting nut (16), a second adjusting nut (17) and a third adjusting nut (18) arranged on the connecting screw; the connecting screw rod is provided with a stop block for preventing the connecting screw rod from falling out of the first connecting block through hole at one side of the first connecting block, the first adjusting nut and the second adjusting nut are sequentially arranged between the first connecting block and the second connecting block, and the third adjusting nut is located on one side of the second connecting block far away from the first connecting block.
3. The test calibration system for measuring vertical micro-deformation according to claim 2, wherein the adjusting mechanism is an adjusting rod, mutually matched transmission threads are arranged on the convex ridge and at the end part of the adjusting rod, the adjusting rod is combined with the transmission thread teeth on the convex ridge to control the mounting part to move along the sliding groove, and the adjusting rod is provided with a locking switch.
4. A test calibration system for measuring vertical micro-deformations according to claim 3, characterized in that the mounting portion is provided with four mounting bolts (19) for mounting the reflectors.
5. A test calibration system for measuring vertical micro-deformation according to claim 3, wherein the side of the chute fixing portion is provided with a measurement scale, and the mounting portion is provided with an alignment scale at a position corresponding to the position of the chute fixing portion where the measurement scale is provided.
6. The test calibration system for measuring vertical micro-deformation according to claim 3, wherein the fixed base and the movable base are connected in a shaft pin structure, the sliding groove is a dovetail groove, a connecting plate (20) is arranged between the movable base and the sliding groove fixing portion, the sliding groove fixing portion is fixedly connected with the connecting plate, and the movable base is fixedly connected with the connecting plate through a bolt.
7. The test calibration system for measuring vertical micro-deformation according to claim 1, wherein the transmitting device is one of a radar transmitting device or a laser ranging device.
8. The test calibration system for measuring vertical micro-deformation of claim 7, wherein the support frame is a tripod.
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| CN201710894123.8A CN107807350B (en) | 2017-09-28 | 2017-09-28 | Test calibration system for measuring vertical micro-deformation and calibration method thereof |
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| CN108427103A (en) * | 2018-04-20 | 2018-08-21 | 中铁第四勘察设计院集团有限公司 | A kind of corner reflector for the calibration of ground-based radar echo-signal |
| CN109143206B (en) * | 2018-08-27 | 2021-06-01 | 森思泰克河北科技有限公司 | Laser radar calibration device and calibration method |
| CN108775891B (en) * | 2018-09-07 | 2024-02-13 | 芜湖明远电力工程咨询设计有限公司 | Distance measuring instrument |
| CN111983150B (en) * | 2020-08-21 | 2022-10-25 | 阿克陶县诚鑫路桥有限责任公司 | Building board detection deformation simulation positioning device based on stepping electric telescopic rod |
| EP4391233A1 (en) * | 2022-12-23 | 2024-06-26 | Iceye Oy | Satellite radar beam reflector |
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