CN103604385B - Deformation monitoring device, deformation monitoring method and granary deformation monitoring system - Google Patents
Deformation monitoring device, deformation monitoring method and granary deformation monitoring system Download PDFInfo
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- CN103604385B CN103604385B CN201310642565.5A CN201310642565A CN103604385B CN 103604385 B CN103604385 B CN 103604385B CN 201310642565 A CN201310642565 A CN 201310642565A CN 103604385 B CN103604385 B CN 103604385B
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Abstract
The invention relates to a deformation monitoring device, a deformation monitoring method and a granary deformation monitoring system, and the deformation monitoring device, the deformation monitoring method and the granary deformation monitoring system are used for solving the problems that the automation degree of an existing granary deformation monitoring device is low and cost is high. The deformation monitoring device is characterized by comprising at least a set of laser communication devices, each set of laser communication devices is composed of a drive module and a response module corresponding to the drive module, and the drive module and the response module are respectively provided with a laser for transmitting laser signals and a photoelectric converter used for receiving the laser signals. By the adoption of the laser linear transmission principle, the problem of granary body structural deformation which is difficult to monitor is solved; practical-circuit-free data transmission between the monitoring position and a primary control circuit can be achieved, and fireproof potential safety hazards caused by circuit arrangement and control are avoided.
Description
Technical field
The present invention relates to a kind of deformation monitoring equipment, deformation monitoring method and silo deformation monitoring system.
Background technology
For a long time, China's foodstuff preservation environment is poor, and safety management technology falls behind.With regard in " 5 31 " Heilungkiang in 2013
Grain storage Lindian directly under for the fire of storehouse it is simply that a case history.Fire causes grain 78 grain bin to overdo, direct economic loss
More than 80,000,000.Generally the management of silo and monitoring mainly temperature and humidity is monitored, but these monitor past
Toward the deformation only for integrated environment and cereal, causing for silo warehouse hot-spot and cave in it is impossible to make instant standard
Really early warning is it is impossible to carry out safety monitoring and warning to the silo structural deformation causing due to localized hyperthermia.
In recent years, intelligent silo, silo technology of Internet of things and silo warehouse safety problem increasingly receive publicity, especially
It is increasingly urgent in silo structural deformation detection requirement.This is because structural deformation can reflect the many of silo
Safety factor and state.For example: the deformation that local heating causes；Cereal puts what the unreasonable warehouse local compression causing caused
Warehouse deformation；The warehouse entirety deformation that weather or weather reason cause.The safety factor that these deformation are hidden is pacified for grain storage
Entirely particularly important.
Further, since silo is interior and surrounding starch dust is more, does not typically allow to install and do not make totally enclosed electronic monitoring
Equipment, otherwise, the potential safety hazard of inherently one generation fire of electronic monitoring equipment.This requires the monitoring measurement point of silo
Monitoring device around can not arrange the power supply circuit not making to close.
Silo warehouse security monitoring in the market is mainly the inductor such as humiture and SCM Based embedded
The means such as system are monitored to the concentration of dust in temperature, humidity, material position, storehouse, and these forms are relatively ripe, but do not send out
Existing people is monitored to the deformational displacement of silo warehouse, does not also have safer silo fireproof monitoring equipment.China is to building
The testing tool collapsing or tilting of thing has pitch system and total powerstation etc..Although people are measured using inclination measurement system at this stage
The tilt accuracy of building is relatively very high, but the embedded and monitoring of tipping tube has very in the enforcement of concrete barn building
Big difficulty, and cost is very high.Although total powerstation is more relatively easy, automaticity is not high, and is unfavorable for silo
Warehouse multiple spot monitoring.
Content of the invention
It is an object of the invention to provide a kind of deformation monitoring equipment, deformation monitoring method and be based on the said equipment, method
Silo deformation monitoring system, in order to solve the problems, such as that existing silo deformation monitoring automaticity is low, high cost.
For achieving the above object, the solution of the present invention includes:
A kind of deformation monitoring equipment, including least one set laser communication device, every group of laser communication device is by an active
Module and a corresponding respond module are constituted, and active module and respond module are equipped with the laser instrument for launching laser signal
With the optical-electrical converter for receiving laser signal.
Energy taking device for taking energy from local environment is additionally provided with respond module.
The energy taking device of respond module is a photoelectric conversion device, and active module corresponding with respond module is provided with light
Energy emitter, for irradiating described photoelectric conversion device, photoelectric conversion device connects an accumulator.
Lay described deformation monitoring equipment in region to be monitored, make active module and the response mould of every group of laser communication device
Block corresponds；The active that the laser instrument of active module and the optical-electrical converter of respond module are correspondingly arranged at least formation swashs
Optical communication path, the bar response that the optical-electrical converter of active module and the laser instrument of respond module are correspondingly arranged at least formation swashs
Optical communication path；Laser communication process is initiated by active module, according to the feedback of respond module, judges laser communication whether just
Often, if normal, judge undeformed, if abnormal, judge that tangible change produces；Laser communication process is: first by active module
Laser signal is sent by laser instrument, the optical-electrical converter of corresponding respond module is received and converted to electric signal；It is then responding to
The laser instrument of module sends feedback signal, and the optical-electrical converter of active module receives and changes.
Every group of laser communication device adopts i2c communication mode, and active laser communication port includes two, and one is used for sending
Cadence signal, another is used for sending data-signal.
Energy taking device for taking energy from local environment is additionally provided with respond module.
The energy taking device of respond module is a photoelectric conversion device, and active module corresponding with respond module is provided with light
Energy emitter, for irradiating described photoelectric conversion device, photoelectric conversion device connects an accumulator.
Before active module initiates laser communication process, start luminous energy emitter first, be respond module energy supply, for storage
Can device charge.
Deformation monitoring system includes least one set laser communication device, every group of laser communication device by an active module and
One corresponding respond module is constituted, and active module and respond module are equipped with the laser instrument for launching laser signal and are used for
Receive the optical-electrical converter of laser signal；Each active module controlled connection in a master control set, master control set and each active mould
Block is provided with grain bin bottom, and each active module is laid in grain bin bottom periphery, and each respond module correspondence is laid in silo top peripheral.
Energy taking device for taking energy from local environment is additionally provided with respond module；The energy taking device of respond module is one
Individual photoelectric conversion device, active module corresponding with respond module is provided with luminous energy emitter, turns for irradiating described photoelectricity
Changing device, photoelectric conversion device connects an accumulator.
Due to which employs laser straight line transmission principle so that the silo structural deformation monitoring problem of more difficult monitoring obtains
To solve；Can achieve the no actual track data transfer between monitoring position and governor circuit, it is to avoid circuit is deployed to ensure effective monitoring and control of illegal activities and brought
Fire safety hidden danger.
Using confession electrically, decrease the arrangement of power circuit, further enhancing fire safety performance.
Complete equipment low cost, easy for installation.
Brief description
Fig. 1 is deformation monitoring apparatus embodiments 1；
Fig. 2 is deformation monitoring apparatus embodiments 2；
Fig. 3 is deformation monitoring apparatus embodiments 3；
Fig. 4 is the schematic diagram of silo deformation monitoring system embodiment；
Fig. 5 is silo deformation monitoring system installation diagram；
Fig. 6 is master control borad circuit theory diagrams；
Fig. 7 is daughter board circuit theory diagrams；
Fig. 8 is outside plate circuit theory diagrams；
Fig. 9 is daughter board and outer panel assembly outline drawing.
Specific embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
A kind of deformation monitoring system as shown in Figure 1, lays its equipment, its equipment is main on region to be monitored or object
Including least one set laser communication device, every group of laser communication device is by an active module and a corresponding respond module structure
Become, active module and respond module are equipped with the laser instrument for launching laser signal and turn for receiving the photoelectricity of laser signal
Parallel operation.
In order to reduce the laying of cable run as far as possible, active module and respond module can adopt non-powered line powering
Mode, such as by environment power taking, such as solar energy, vibrational energy etc..For cost consideration, active module can be using power supply
Line powering, is arranged in the position of easy wiring, and respond module is laid in the position being difficult to connect up (as following silo is implemented
Example).
For example, an energy taking device is set on using respond module, as shown in Figure 2.Turn as Fig. 3 gives a photoelectricity
, as energy taking device, this photoelectric conversion device is corresponding with a luminous energy emitter in respond module for changing device, and luminous energy is launched
Device is used for irradiating photoelectric conversion device, and photoelectric conversion device connects an accumulator, is charging accumulator.
The method implementing the deformation monitoring of the present invention is as follows:
Lay described deformation monitoring equipment in region to be monitored, make active module and the response mould of every group of laser communication device
Block corresponds；The laser instrument of active module and the optical-electrical converter of respond module are correspondingly arranged at least one active laser of formation
Communication port, the optical-electrical converter of active module and the laser instrument of respond module are correspondingly arranged formation at least one response laser and lead to
Letter passage.Active laser communication port refers to be transmitted from active module to respond module, and response laser communication passage refers to by phase
Answer module to active module transfer.
Laser communication process is initiated by active module, according to the feedback of respond module, judges whether laser communication is normal, if
Normal then judge undeformed, if abnormal, judge that tangible change produces.Laser communication process is: has active module to pass through to swash first
Light device sends laser signal, and the optical-electrical converter of corresponding respond module is received and converted to electric signal；It is then responding to module
Laser instrument sends feedback signal, and the optical-electrical converter of active module receives and changes.
Laser communication can adopt various ways, such as simple response formula communication mode, only needs an active laser communication
Passage and a bar response laser communication passage.
Every group of laser communication device can also using more reliable communication mode, for example with i2c communication mode, according to
I2c agreement, now active laser communication port include two, one is used for sending cadence signal, and another is used for sending data
Signal, response laser communication passage is still one.Send cadence signal data signal with regard to laser signal to lead to simulate i2c
News, belong to routine techniques means, will not be described here.
If Fig. 3 is by the way of active module is to respond module illumination energy supply, active module initiate laser communication process it
Before, luminous energy emitter can be started first, be respond module energy supply, be charging accumulator, to be charged finish, then control unlatching
Communication process.
There are multiple choices with regard to Content of Communication, such as set some codes and be transmitted.For example, active module sends and controls life
Order, feeds back itself specific code information by respond module.
A kind of deformation monitoring system embodiment of application in silo given below, in this embodiment, as shown in figure 5, main
Control device abbreviation master control borad, submodule block assembly abbreviation daughter board, remote end module device abbreviation outside plate, daughter board is all connected to master control
Plate, can be responsible for the whether normal judgement of various communications by master control borad is unified.
If Fig. 4 deformation monitoring equipment is in the mounting arrangement figure of silo, this mode is applicable not only to vertical barrel silo, also fits
For Tu Pu storehouse., located at silo chassis 1, each daughter board 7 is uniformly laid in silo chassis periphery, each outside plate 5 for master control borad 2 and each daughter board
Correspondence is uniformly laid in silo silo roof 4 periphery, and the laser communication passage 6 of formation is outside bulkhead 3.
As Fig. 6-8 gives the circuit theory diagrams of master control borad, daughter board and outside plate, it will be appreciated by those skilled in the art that this
A little circuit are all based on the physical circuit of the present invention program, and those skilled in the art can also adopt after understanding of present inventive concept
Realize the solution of the present invention with various different physical circuits.
8 daughter boards of master control borad wheel flow control are sent in the laser signal sequence being spaced break-make on the time, are radiated at outside plate
On optical-electrical converter, the laser beam propagation path of laser signal sequence is referred to as signal laser passage.Signal laser passage mainly to
Outside plate sends the control command signals such as inquiry, and the break-make laser signal on a timeline receiving is converted into numeral letter by outside plate
Number, according to querying command, outside plate numbering is fed back to daughter board by signal laser passage in the same fashion.Son is passed through by master control borad
Plate reads Query Result, if not finding numbering, thinking and there occurs skew, if receiving the outside plate numbering of this position, thinks this position
Put representative direction bulkhead not shifting.As shown in figure 5,8 daughter boards and 8 outside plates align two-by-two, master control borad is according to 8
Query Result on individual direction is it can be determined that go out warehouse overall offset direction or local bulkhead deformation direction.
In the present embodiment, this laser instrument larger by power of luminous energy transmitting of daughter board is realized, by the photoelectricity on outside plate
Conversion equipment receives, and the passage between them is referred to as luminous energy laser channeling.The opening and closing of luminous energy laser are by master control borad control
System, daughter board installs control interface and generating laser.So, the laser instrument on daughter board is divided into luminous energy laser instrument and signal laser
Device, the photoelectric conversion section on outside plate is divided into the photoelectric conversion device receiving luminous energy, and the optical-electrical converter of receipt signal.
Master control borad circuit is as shown in Figure 6.Specifically include that single-chip microcomputer and peripheral circuit, wherein atmega8l is single-chip microcomputer,
Jp4 is other as Sensing interface circuit such as temperature；485 communication interface circuits；Digital-scroll technique circuit；Daughter board luminous energy laser control
Circuit, can open and close the luminous energy generating laser of daughter board, and charge low level is opened so that daughter board is outside by laser
Plate charges, and charge high level is then closed so that daughter board stops charging to outside plate；Master control borad and daughter board Jian eight tunnel bus connect
Mouthful, wherein control1, control2 and control3 are used for controlling daughter board to send break-make laser sequence signal, and sonin can be from
Daughter board receives outside plate feedback signal, and in interface, 1 and 8 pins are the power supply common lines of master control borad and daughter board, and baks line does not use, as
Siding, charge_o controls the luminous energy laser instrument launch-control line of daughter board for master control borad, controls the luminous energy laser instrument of daughter board to open
Open and close；Warning circuit；Power supply and filter circuit.
If Fig. 7 is daughter board circuit diagram, specifically include that luminous energy laser emitting module and master control plate interface, wherein rj45_3 is
Master control borad eight line interface, 1,8 pin is power supply common lines, and con1, con2 and con3 are that 3 road signal laser switch control rule (connect
Control1, control2 and control3 of Fig. 6)；Co(connects the charge_o in Fig. 6) control for luminous energy laser switch,
Co can control the opening and closing of luminous energy laser instrument laser4 laser10 simultaneously.Signal laser is laser1
Laser3, signal laser receiving circuit includes an optical-electrical converter rled4, and input feedback terminal connects in Fig. 6 for sin(
Sonin).
Outside plate circuit is as shown in figure 8, specifically include that single-chip microcomputer and signal laser receiving circuit, including optical-electrical converter
rled2、rled3.Laser11 is signal laser transmitter, and atmega8l is single-chip microcomputer；Gb1～gb7 is optical-electrical converter,
Faladi is accumulator, and bt2 is reserve battery (in case light energy pathways inefficacy), and optical-electrical converter rled1 comes from for receiving
The control signal of daughter board, can be turned on and off the power supply of whole outside plate, when daughter board needs to outside plate transmission signal, signal laser
Device laser1 (con1 control) irradiates rled1 so as to conducting, so that outside plate power supply is powered, processor is opened and run.Work as daughter board
When need not exchange information with outside plate, then rled1 disconnection can be controlled by signal laser, thus closing outside plate power supply so that outside plate
Processor is out of service, only opens outside plate power supply when outside plate and daughter board exchange information.So greatly save outside plate electricity
Can be lost so that relying solely on the fortune that the electric energy storage converting from the laser light energy of daughter board reception just can maintain device
OK.
Fig. 9 be daughter board with outside corresponding outward appearance, daughter board include 3 signal laser transmitters (out1-out3, right respectively
Answer laser1 laser3), a receiver (in, corresponding rled4), great circle region corresponds to luminous energy generating laser
laser4——laser10.Corresponding, outside 3 signal laser receivers of inclusion (in1-in3, corresponding optical-electrical converter
Rled1-rled3), a signal laser transmitter (out, corresponding laser11), great circle region corresponds to luminous energy generating laser
Gb1～gb7.The launch hole out1 of daughter board is aligned with the receiver hole in1 of outside plate；The launch hole out2 of daughter board and the receiver hole of outside plate
In2 is aligned；The receiver hole in of daughter board is aligned with the launch hole out of outside plate；The launch hole out3 of the daughter board and receiver hole in3 of outside plate
Be aligned.
Specific works step is as follows:
(1) master control borad circuit Single-chip Controlling q1 conducting, charge_o obtains power supply output.Charge_o connects daughter board electricity
After the co on road, co obtain power supply, open luminous energy generating laser laser4～10 so that daughter board provides luminous energy to outside plate simultaneously.
(2), after the light energy battery of outside plate or optical-electrical converter gb1～gb7 obtains luminous energy, electric energy is stored up in high power capacity electric capacity
Can lay in device faladi；Now, outside plate microcontroller power supply vcc2 does not open.
(3) (known by the charging interval that master control borad controls charge) after outside plate electric energy storage is sufficient, master control borad monolithic
Machine controls control3 end high level, daughter board laser1 laser transmitter projects laser, and outside plate optoelectronic multiplex switch rled1 opens
So that outside plate microcontroller power supply end vcc2 obtains power supply, outside plate single-chip microcomputer startup self-detection runs for conducting.
(4), after master control borad waits outside plate self-inspection to finish, send 8 to outside plate and look into by the Laser emission and receiver of daughter board
Ask order.The method sending is: using 3 road signal laser passages, it then follows i2c agreement sends data.Why using 3 paths
It is because laser signal transmission can only be one-way transmission it is therefore desirable to an extra road response Laser feedback signal.Master control borad is sent out
When sending data: control control2 end to generate clock signal scl of i2c agreement, control control3 end to generate querying command number
It is believed that number sda, send 8 data with this two io ends according to the signal sequence of i2c agreement；Outside plate rled2 receives clock letter
Number clk, with rled3 receiving data signal sda, passes through daughter board according to agreement with laser11 and sends feedback signal to master control borad
ack.
(5) outside plate sends outside plate number information with i2c protocol mode to master control borad according to order, because outside plate is sent out to daughter board
The laser via penetrated only one road it is impossible to retransmit clock signal clk of agreement, can only using daughter board to outside plate launch when
Clock signal scl, and can only be at the end of sda signal sends, according to the next clock sequence number sequence of other side's transmitting, with an only road
Half-duplex channel sends to master control borad.Sending method is: controls daughter board to launch 8 querying commands and receive outside plate in master control borad
After the feedback signal ack of laser11, continue to keep the transmitting of clock signal scl, outside plate is given birth to according to the clock signal sequence of scl
Become to send data signal sequence, i2c agreement is pressed by laser11 and launches outside plate numbering sda data-signal to daughter board, master control borad is received
To after 8 outside plate numberings, control3 is set to low level, closes daughter board laser1 generating laser, thus closing outside plate electricity
Source.Whole workflow terminates.
(6) master control borad inquires about the outside plate numbering return information on 8 positions in fashion described above successively, according to returning result,
Issue the warning message of different stage.
The present invention is mainly suitable for fire prevention, anti-electric etc. require the structural deformation such as high silo to monitor, solve each
Plant the structural deformation monitoring problem in vertical barrel silo or Tu Pu storehouse, can be used as the key technology of intelligent silo or silo Internet of Things.
The present invention is not limited to above-mentioned embodiment, using the structure identical or approximate with the above embodiment of the present invention or electricity
Road principle, obtained from other devices, all within protection scope of the present invention.
Claims (5)
1. a kind of deformation monitoring equipment is it is characterised in that deformation monitoring equipment, including least one set laser communication device, every group
Laser communication device is made up of an active module and a corresponding respond module, the laser instrument of active module and respond module
Optical-electrical converter be correspondingly arranged at least formation one active laser communication port, the optical-electrical converter of active module with response mould
The laser instrument of block is correspondingly arranged formation at least one response laser communication passage；Active module and respond module are equipped with for sending out
Penetrate the laser instrument of laser signal and the optical-electrical converter for receiving laser signal；It is additionally provided with respond module for from residing ring
The energy taking device of energy is taken in border；The energy taking device of respond module is a photoelectric conversion device, active corresponding with respond module
Module is provided with luminous energy emitter, and for irradiating described photoelectric conversion device, photoelectric conversion device connects an accumulator.
2. the deformation monitoring method of equipment described in application claim 1 is it is characterised in that lay described deformation in region to be monitored
Monitoring device, makes the active module of every group of laser communication device and respond module correspond；The laser instrument of active module and sound
The optical-electrical converter answering module is correspondingly arranged an active laser communication port of at least formation, the optical-electrical converter of active module
It is correspondingly arranged a bar response laser communication passage of at least formation with the laser instrument of respond module；
Laser communication process is initiated by active module, according to the feedback of respond module, judges whether laser communication is normal, if normally
Then judge undeformed, if abnormal, judge that tangible change produces；
Laser communication process is: sends laser signal, the photoelectricity of corresponding respond module by active module by laser instrument first
Converter is received and converted to electric signal；The laser instrument being then responding to module sends feedback signal, the opto-electronic conversion of active module
Device receives and changes；
Energy taking device for taking energy from local environment is additionally provided with respond module；
The energy taking device of respond module is a photoelectric conversion device, and active module corresponding with respond module is provided with luminous energy and sends out
Injection device, for irradiating described photoelectric conversion device, photoelectric conversion device connects an accumulator.
3. deformation monitoring method according to claim 2 is it is characterised in that every group of laser communication device adopts i2c to communicate
Mode, active laser communication port includes two, and one is used for sending cadence signal, and another is used for sending data-signal.
4. deformation monitoring method according to claim 2 it is characterised in that active module initiate laser communication process it
Before, start luminous energy emitter first, be respond module energy supply, be charging accumulator.
5. silo deformation monitoring system is it is characterised in that include least one set laser communication device, every group of laser communication device by
One active module and a corresponding respond module composition, the laser instrument of active module and the optical-electrical converter pair of respond module
At least one active laser communication port of formation should be set, and the optical-electrical converter of active module is corresponding with the laser instrument of respond module
Setting forms at least one response laser communication passage；Active module and respond module are equipped with for launching swashing of laser signal
Light device and the optical-electrical converter for receiving laser signal；Each active module controlled connection is in a master control set, master control set
It is provided with grain bin bottom with each active module, each active module is laid in grain bin bottom periphery, each respond module correspondence is laid in grain
Storehouse top peripheral；Energy taking device for taking energy from local environment is additionally provided with respond module；The energy taking device of respond module
For a photoelectric conversion device, active module corresponding with respond module is provided with luminous energy emitter, for irradiating described light
Electrical switching device, photoelectric conversion device connects an accumulator.
Priority Applications (1)
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| CN201310642565.5A CN103604385B (en) | 2013-12-03 | 2013-12-03 | Deformation monitoring device, deformation monitoring method and granary deformation monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310642565.5A CN103604385B (en) | 2013-12-03 | 2013-12-03 | Deformation monitoring device, deformation monitoring method and granary deformation monitoring system |
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| CN103604385B true CN103604385B (en) | 2017-01-18 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105737752A (en) * | 2014-12-06 | 2016-07-06 | 中国石油化工股份有限公司 | Vertical storage tank safety system |
| CN109375531B (en) * | 2018-08-23 | 2022-11-29 | 成都比斯特科技有限责任公司 | Intelligent storage management and control integrated system of granary |
| CN109260608B (en) * | 2018-08-31 | 2021-05-18 | 上海联影医疗科技股份有限公司 | Deformation detection system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1632461A (en) * | 2004-12-29 | 2005-06-29 | 西安华腾光电有限责任公司 | Symmetrical closed laser arch dam deformation monitoring method |
| CN101063610A (en) * | 2007-05-28 | 2007-10-31 | 张立品 | Automatic monitoring system for engineering project deformation |
| CN101865664A (en) * | 2010-05-18 | 2010-10-20 | 武汉大学 | Portable dynamic deflection displacement measuring device and method |
| CN103344185A (en) * | 2013-07-08 | 2013-10-09 | 刘晓宇 | Non-contact automatic displacement monitoring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3798188B2 (en) * | 1999-06-28 | 2006-07-19 | 株式会社小糸製作所 | Shape change measuring device |
| KR20010076953A (en) * | 2000-01-28 | 2001-08-17 | 김옥환 | Method and system for measuring displacement of structure using laser beam |
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2013
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632461A (en) * | 2004-12-29 | 2005-06-29 | 西安华腾光电有限责任公司 | Symmetrical closed laser arch dam deformation monitoring method |
| CN101063610A (en) * | 2007-05-28 | 2007-10-31 | 张立品 | Automatic monitoring system for engineering project deformation |
| CN101865664A (en) * | 2010-05-18 | 2010-10-20 | 武汉大学 | Portable dynamic deflection displacement measuring device and method |
| CN103344185A (en) * | 2013-07-08 | 2013-10-09 | 刘晓宇 | Non-contact automatic displacement monitoring device |
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