CN102419154A - Non-contact micro displacement measuring device and method based on linear array CCD (charge coupled device) - Google Patents
Non-contact micro displacement measuring device and method based on linear array CCD (charge coupled device) Download PDFInfo
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- CN102419154A CN102419154A CN2011102670911A CN201110267091A CN102419154A CN 102419154 A CN102419154 A CN 102419154A CN 2011102670911 A CN2011102670911 A CN 2011102670911A CN 201110267091 A CN201110267091 A CN 201110267091A CN 102419154 A CN102419154 A CN 102419154A
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Abstract
The invention provides a non-contact micro displacement measuring device and method based on a linear array CCD (charge coupled device). Laser emitted by a horizontal linear laser is irradiated on the linear array CCD, and a light sensing pixel outputs a signal under the action of a drive pulse; when the output signal exceeds a set background threshold voltage, a threshold comparator outputs rectangular pulse strings; and after the rectangular pulse strings at different moments are processed, the central positions of the rectangular pulse strings are respectively obtained, thus obtaining the absolute displacement of the linear array CCD between different moments. The number of rectangular pulse signals output by a threshold adjuster is determined by the comparison result of the threshold voltage and the output signal voltage of the linear array CCD; and a central processing unit is mainly used for concerning the number of the rectangular pulse signals output by the threshold adjuster, therefore the device provided by the invention facilitates the process control regulation, is high in precision and small in noise, can store optimal operating point data output by a digital potentiometer, and provides data supports for regulating the output of the digital potentiometer in different environments.
Description
Technical field
The present invention relates to a kind of measurement mechanism and method, the device and method of a kind of real-time monitoring device micro-displacement to be measured or deformation quantity relates in particular to the data acquisition system (DAS) and the passage expansion technique of this measurement mechanism.
Background technology
The measurement of displacement and deformation quantity is in important effects of numerous application play more and more such as surface measurement, Materials Measurement, precision optical machinery measurements.Displacement Measurement or deformation quantity can adopt contact type measurement method and non-contact type measuring method.Traditional contact measurement method has a lot of limitation, is difficult to realize the high Precision Detection to small displacement; Contactless measuring method has characteristics such as apparatus structure is simple, speed is fast, measuring accuracy is high, convenient in application is flexible, is widely used at present.
The more leg-of-mutton principles of existing non-contact displacement measurement device great majority utilization are used laser positioning to obtain the information of displacement, and can only be supported the measurement of single-point, and data also are not easy to long-distance transmissions.Like application number is 200820151430 patented claim " CCD laser triangulation displacement transducer ", utilization be that leg-of-mutton principle has realized the displacement measurement to single-point.
ADC chip and exclusive data Acquisition Circuit are used in analog to digital conversion, data acquisition mostly in the present non-contact displacement measurement device; Data transmission is used the RS232 bus; Entire measuring device is not easy to expansion; Data can not be carried out long-distance transmissions, are the patented claim " the ccd data collection and the treating apparatus that are used for high-speed displacement measuring " of " 200710092425 " like application number, utilization be exactly foregoing circuit.
Summary of the invention
The purpose of this invention is to provide one measures in real time and shows; 256 nodes of maximum support; Measurement parameter can be set; Data can long-distance transmissions, and based on the noncontact micro-displacement measurement device and method of line array CCD, it has solved being not easy to expansion, not supporting multistation, measurement data can not carry out technical matterss such as long-distance transmissions of existing method and apparatus.
Technical solution of the present invention is:
A kind of noncontact micro-displacement measurement device based on line array CCD, its special character is: comprise the horizontal line laser instrument, multichannel measurement unit, communication module, the computer control module that are used to provide the horizontal line laser beam; Said horizontal line laser instrument fixed placement, said multichannel measurement cell distribution are on device to be measured, and said measuring unit comprises line array CCD, data acquisition module, the protocol conversion module that connects successively; The protocol conversion module of said multichannel measurement unit communicates through communication module and computer control module; Said line array CCD is used for the laser that the sensitive level laser line generator sends; Said data acquisition module comprises primary signal conditioning unit, CPU and the sheet external memory unit that connects successively; Used primary signal conditioning unit comprises threshold adjuster, digital regulation resistance and PLD; Said digital regulation resistance is used for the threshold voltage of setting threshold regulator, and said threshold adjuster is according to threshold voltage and line array CCD output signal voltage comparative result output rect.p. string; The numerical value that said PLD is set according to computer control module, the output voltage of adjusting digital regulation resistance; Said external memory unit is used to store the data that test obtains; Said CPU is read-write sequence and the realization hardware medium filtering of rect.p. string determined level line laser on the center on the line array CCD, control strip external memory unit that line array CCD provides driving pulse, the output of passing threshold regulator.
Above-mentioned measurement mechanism also comprises the optical filter that is arranged on before the line array CCD.
Above-mentioned digital regulation resistance is the digital regulation resistance of 256 taps.
Above-mentioned protocol conversion module comprises RS485 protocol conversion chip and microcontroller; Above-mentioned RS485 protocol conversion chip is realized the conversion between RS485 and the RS232 agreement; Above-mentioned microcontroller is the RS232 agreement with the data-switching that obtains in the CPU and is transferred in the RS485 protocol conversion chip that the sequential of controlling the communication between each line array CCD simultaneously is to prevent the timing conflict on the bus; Above-mentioned communication module comprises transmission cable and usb protocol conversion chip, and above-mentioned usb protocol conversion chip is realized the mutual conversion between usb protocol and RS485, the RS232 agreement, and communicates through transmission cable and computer control module.
A kind of noncontact micro-displacement measurement method based on line array CCD may further comprise the steps:
1) install and measure device: entire measuring device is arranged in will carries out in the environment of displacement measurement, wherein the horizontal line laser instrument is fixed, and a plurality of line array CCDs are arranged on the measured device, and is in the position that can receive the laser that the horizontal line laser instrument sends;
2) in measurement environment, carrying out the background threshold voltage demarcates: the horizontal line laser instrument of not fetching boiling water earlier; The output voltage of digital regulation resistance is delivered to the threshold voltage of threshold adjuster as threshold adjuster; Regulate the output voltage of digital regulation resistance; Make threshold adjuster threshold voltage near but be no more than the analog electrical signal voltage of line array CCD output, promptly do not produce the output of rect.p. string, the output voltage of the digital regulation resistance of this moment is the background threshold voltage;
3) Displacement Measurement: the horizontal line laser instrument of fetching boiling water; Regulate the output intensity of horizontal line laser instrument; Make it to surpass background threshold voltage 20% to 100%; The laser radiation that the horizontal line laser instrument sends is on line array CCD, and line array CCD sensitization pixel is exported the analog electrical pulse signal under the driving pulse effect, when output signal voltage surpasses the background threshold voltage of setting; Threshold value comparer output rect.p. string, the number of rect.p. depends on background threshold voltage and the comparative result of line array CCD output signal voltage in threshold adjuster;
4) data in real time is handled: the rect.p. string outputs in the CPU; CPU is through handling; Obtain the center of rect.p. string; CPU as corresponding with it line array CCD relative position at this moment, and is stored with the information transmission of this relative position this position in sheet external memory unit; When next rect.p. string arrives, in like manner can obtain the relative position of this line array CCD again and store it, both relatively obtain the absolute displacement of this line array CCD between two moment.
Above-mentioned displacement measurement method is further comprising the steps of: after all position datas of the certain hour of sheet external memory unit storage, to computer control module, realize the aftertreatment of data through the RS485 bus transfer.
The advantage that the present invention had:
1, the horizontal line laser instrument of the present invention laser radiation of sending is on line array CCD; The sensitization pixel is exported signal under the driving pulse effect; When the output signal surpasses the background threshold voltage of setting; Threshold value comparer output rect.p. string obtains the center of rect.p. string respectively after the different rect.p. string manipulation constantly, thereby obtains this line array CCD in the absolute displacement of difference between the moment.The present invention has adopted threshold value adjustment, and the number of the output rectangular pulse signal of threshold adjuster depends on the threshold voltage of threshold adjuster and the comparative result of line array CCD output signal voltage; It is main in the CPU that what pay close attention to is the number of rectangular pulse signal in the rect.p. string of threshold value adjustment output; So the device threshold value is convenient to program control adjusting, precision is high, and noise is little, can preserve the data of the best operating point of digital regulation resistance output, for the output of in varying environment, regulating digital regulation resistance provides the data support;
2, the present invention has adopted the RS485 bus interface technology in the transmission of data; The RS485 bus interface technology has advantages such as ability, long distance for data, the transfer rate of supporting multistation be fast; In use can support 256 nodes, data transmission distance is 1.2km;
3, the present invention has adopted on-site programmable gate array FPGA as core parts on data collecting card, makes that device can online programming, is easy to expanded application;
4, the present invention uses jumbo peripheral storage device on data storage, can store the 64k*16bits data, uses microcontroller to come the read-write of control data and the sequential between the different line array CCD, has simplified control;
5, the present invention has computer control software easily; Friendly human-computer interaction interface, the user can accomplish functions such as control, demonstration and record through computing machine easily away from the on-the-spot rear of experiment; Through software can setting device sampling parameter, show in real time and analog vibration;
6, since existing non-contact displacement measurement apparatus structure complicated, expensive, be not easy to debugging and expansion, the present invention adopts the accurate measurement of circuit common realization to displacement, effectively reduces experimental cost;
7, the invention solves do not support in the displacement measuring device multistation, data can not long-distance transmissions, be not easy to problem such as expansion, have friendly control interface, can in real time, accurately accomplish the accurate measurement of displacement and deformation quantity.
8, the present invention supports 256 nodes; Sampling rate is the highest 5000 times/second, is 10 seconds writing time to the maximum, has three kinds of triggering modes available; Be respectively automatic triggering, manual triggers and external trigger; The transmission range of data is greater than 1.2km, and the rear end recording control apparatus can carry out the demonstration and the three-dimensional vibrating simulation of Wave data after the information that receives data collecting card output.Through the contrast experiment, the measuring accuracy of device reaches 0.1mm.
Description of drawings
Fig. 1 is principle of the invention figure;
Fig. 2 is the schematic diagram of data collecting card of the present invention;
Fig. 3 is the schematic diagram of threshold value adjustment of the present invention;
Fig. 4 is the schematic diagram of protocol conversion module of the present invention;
Fig. 5 is the process flow diagram of computer control software.
Embodiment
A kind of device that is used for Displacement Measurement and deformation quantity comprises the horizontal line lasing light emitter U1, the multichannel measurement unit that are used to provide the horizontal line laser beam, is used for communication module U5 and computer control software U6 that Data Receiving and steering order are sent; Wherein: every drive test amount unit pack draws together line array CCD U2, be used for the data acquisition module U3 of data acquisition process, be used to the protocol conversion module U4 that transmits and communicate by letter.
Data acquisition card module U3 has comprised primary signal conditioning P1, CPU P2 and sheet external memory unit P3.Primary signal conditioning unit P1 mainly is made up of digital regulation resistance, threshold adjuster and PLD; Wherein the output voltage of digital regulation resistance is as the threshold voltage of threshold adjuster; The output voltage of digital regulation resistance is controlled by PLD; Primary signal processing unit P1 handles the line array CCD output signal voltage, and after the line array CCD output signal voltage surpassed the threshold voltage of threshold adjuster, the threshold value adjustment chip had the output of rect.p. string; CPU P2 uses is the EP1C6Q144 in the Cyclone Series FPGA of altera corp, and main effect has: for line array CCD provide driving pulse, through the output behind the signal condition judge horizontal line laser on the center on the line array CCD, control SRAM read-write sequence and realize hardware medium filtering etc.; Sheet external memory unit P3 is used for storing the data that vibration-testing obtains, and the chip model of use is IS61LV6416, and memory capacity is 64K*16bits.
Protocol conversion module U4 mainly is made up of RS485 protocol conversion C1 and microcontroller C2.What RS485 protocol conversion C1 used is the MAX485 chip of MAXIM company, and major function is the conversion that realizes between RS485 and the RS232 agreement; What microcontroller C2 used is the C8051F340 chip of Silicon Laboratories company; Major function has: the data-switching that will from CPU P2, obtain is that RS232 agreement and being transferred among the RS485 protocol conversion C1 is gone, and the sequential of controlling the communication between each line array CCD node simultaneously is to prevent the timing conflict on the bus.
The information of line array CCD induction outputs to data acquisition module U3, on data acquisition module, carries out signal Processing, and the numerical information that obtains after handling is stored on the high capacity SRAM;
Protocol conversion module U4 with the RS485 bus as between the different line array CCDs, the bus that communicates between line array CCD and the controlling recording equipment; Realized the long-distance transmissions of multi-point and data; With microcontroller as the control of communication device, the control bus sequential;
Communication module U5 mainly is made up of transmission cable and usb protocol conversion chip, the chip model FT232 that usb protocol conversion is used, and its major function is the mutual conversion that realizes between usb protocol and RS485, the RS232 agreement; Data communicate with computer control module after process FT232 chip converts usb protocol into after carrying out long-distance transmissions on the cable;
The Control Software that computer control module U6 realizes based on VB6.0 is as the rear end controlling recording software of device; The process flow diagram of software design is referring to Fig. 5; Computer control software can setting device acquisition parameter; Acquisition parameter has comprised the setting of setting, the setting of writing time and triggering mode of selection, the sampling rate of line array CCD node, can also realize that Wave data shows simultaneously and function such as three-dimensional vibrating simulation.
Measuring process of the present invention:
1, installs and measures device
Entire measuring device is arranged in will carries out in the environment of displacement measurement, wherein the horizontal line laser instrument is fixed on outside the measured device, and a plurality of line array CCDs are arranged on the measured device, and is in the position that can receive the laser that the horizontal line laser instrument sends;
2, in measurement environment, carrying out the background threshold voltage demarcates
Entire measuring device is arranged in will carries out in the environment of displacement measurement, the horizontal line laser instrument of not fetching boiling water earlier, the output voltage of operand word potentiometer is to threshold adjuster, as the threshold voltage of threshold adjuster; When line array CCD output signal voltage during greater than threshold voltage; Threshold adjuster output rect.p. string is regulated threshold voltage, make threshold voltage near but be no more than the line array CCD output signal voltage; Promptly do not produce the output of rect.p. string, voltage at this moment is exactly the background threshold voltage; Threshold voltage needs adjusting repeatedly, if threshold voltage is excessive, can lose a lot of Useful Informations; If threshold voltage is too small, can in system, introduce a lot of undesired signals;
3, Displacement Measurement
The horizontal line laser instrument of fetching boiling water, the output intensity of regulating the horizontal line laser instrument makes it to surpass between the background threshold voltage 20% to 100%, and the horizontal line laser illumination is on line array CCD, and line array CCD produces response, output analog electrical pulse signal.Line array CCD realizes that the unit of opto-electronic conversion is a pixel.The sensitization pixel is the output electric pulse signal under the driving pulse effect, and the amplitude of signal has been reacted the power of corresponding pixel sensitization, and the output order of pulse is consistent with the position of sensitization pixel; When the line array CCD output signal voltage surpasses the background threshold voltage of setting, threshold value comparer output rect.p. string, the number of rect.p. depends on background threshold voltage and the comparative result of line array CCD output signal voltage in threshold adjuster;
Line array CCD output analog electrical pulse signal is to the threshold value comparable chip, and when signal voltage surpassed the background threshold voltage of setting, the threshold value comparable chip was exported the rect.p. string, the concrete course of work:
A) the analog electrical pulse signal of line array CCD outputs to threshold adjuster, and the threshold value of threshold adjuster is demarcated under basis;
B) threshold adjuster receives signal, after signal surpasses threshold voltage, and chip output rect.p. string, the number of rect.p. depends on the comparative result of threshold voltage and line array CCD output signal voltage.
Because the intensity of horizontal line laser and width are along with variable in distance; Cause the line array CCD output signal voltage to change; This can have influence on the number of the rect.p. of threshold adjuster output, exerts an influence finally can for the center of CPU determined level line laser on line array CCD.Through theoretical analysis, calculate to obtain the number that CPU is accurately judged horizontal line laser needed rect.p. in center on line array CCD that this numerical value sends to CPU through computing machine.The numerical value that CPU is set according to computer control module; Number to rect.p. is added up; If number is lacked than what be provided with in advance; Send instructions to digital regulation resistance through PLD so, stepping reduces the output voltage of digital regulation resistance, finally makes the number of the rect.p. that threshold adjuster is exported reach the value that is provided with in advance; If number is more than what be provided with in advance, on the regulating step class.
Add an optical filter before the line array CCD, can further reduce the interference of parasitic light.
4, data in real time is handled
The rect.p. string outputs in the CPU through handling; Obtain the center of rect.p. string; CPU as this line array CCD relative position at this moment, and is transferred to this position in the sheet external memory unit with this digital position information and stores; When next rect.p. string arrives, in like manner can obtain the relative position of this line array CCD again and store it, both relatively just can obtain the absolute displacement of this line array CCD between two moment;
5, the aftertreatment of data
After the position data of sheet external memory unit storage certain hour, to computer control module, realize the aftertreatment of data through 485 bus transfer.
Certain cylindrical platform to be measured, high about 20 meters, about 10 meters of diameter.The miniature deformation amount of this test platform all can be gone up the measured record of arranging of non-contact measurement apparatus by device.For the deformation quantity of real-time monitoring platform, along having arranged the measurement mechanism in the inventive method on certain four optical measurement axial location.
Arrange 8 line array CCD U2 on every optical measurement axis separately; Each line array CCD U2 has a corresponding with it data acquisition module U3; Place a horizontal line laser instrument U1 on the every monitoring line, all measuring points all adopt magnetic bases to be fixed on the test platform.Horizontal line laser instrument U1 is placed on an end of monitoring axis, and all the other each line array CCD U2 measuring points place on other positions of monitoring axis, specifically lay the position of being paid close attention to according to actual optical measuring device itself position and confirm.Each measuring point near linear distributes, and attention should slightly be staggered, and can receive visual-field beam with each line array CCD U2 and be as the criterion.
In the test; Line array CCD U2 is converted into the corresponding charge signal with displacement information, outputs among the data acquisition module U3, through the conversion of data acquisition module U3; Obtain digital signal; Under the control of protocol conversion module U4, this digital signal process communication module U5 long-distance transmissions in the computer control module U6 of rear end, is observed and record.
In this experiment, the sampling rate of setting is 5000 times/second, and acquisition time is 5 seconds, and triggering mode is to trigger automatically, and the transmission range of data is 1.2km.The line array CCD pixel spacing of selecting for use is 14um, is 2-4mm with horizontal line laser instrument live width in surveyed area.At four road axis of measuring in totally 32 test points, through with the Mechanical Method correlation calibration, measuring accuracy reaches 0.1mm.Deformation quantity at the large-scale optic test platform of packaged type has been obtained good effect in the monitoring in real time.
Claims (6)
1. the noncontact micro-displacement measurement device based on line array CCD is characterized in that: comprise the horizontal line laser instrument, multichannel measurement unit, communication module, the computer control module that are used to provide the horizontal line laser beam; Said horizontal line laser instrument fixed placement, said multichannel measurement cell distribution are on device to be measured, and said measuring unit comprises line array CCD, data acquisition module, the protocol conversion module that connects successively; The protocol conversion module of said multichannel measurement unit communicates through communication module and computer control module;
Said line array CCD is used for the laser that the sensitive level laser line generator sends;
Said data acquisition module comprises primary signal conditioning unit, CPU and the sheet external memory unit that connects successively;
Used primary signal conditioning unit comprises threshold adjuster, digital regulation resistance and PLD; Said digital regulation resistance is used for the threshold voltage of setting threshold regulator, and said threshold adjuster is according to threshold voltage and line array CCD output signal voltage comparative result output rect.p. string; The numerical value that said PLD is set according to computer control module, the output voltage of adjusting digital regulation resistance;
Said external memory unit is used to store the data that test obtains;
Said CPU is read-write sequence and the realization hardware medium filtering of rect.p. string determined level line laser on the center on the line array CCD, control strip external memory unit that line array CCD provides driving pulse, the output of passing threshold regulator.
2. the noncontact micro-displacement measurement device based on line array CCD according to claim 1 is characterized in that: also comprise being arranged on the preceding optical filter of line array CCD.
3. the noncontact micro-displacement measurement device based on line array CCD according to claim 1 and 2, it is characterized in that: said digital regulation resistance is the digital regulation resistance of 256 taps.
4. the noncontact micro-displacement measurement device based on line array CCD according to claim 3, it is characterized in that: said protocol conversion module comprises RS485 protocol conversion chip and microcontroller; Said RS485 protocol conversion chip is realized the conversion between RS485 and the RS232 agreement; Said microcontroller is the RS232 agreement with the data-switching that obtains in the CPU and is transferred in the RS485 protocol conversion chip that the sequential of controlling the communication between each line array CCD simultaneously is to prevent the timing conflict on the bus;
Said communication module comprises transmission cable and usb protocol conversion chip, and said usb protocol conversion chip is realized the mutual conversion between usb protocol and RS485, the RS232 agreement, and communicates through transmission cable and computer control module.
5. noncontact micro-displacement measurement method based on line array CCD may further comprise the steps:
1) installs and measures device
Entire measuring device is arranged in will carries out in the environment of displacement measurement, wherein the horizontal line laser instrument is fixed, and a plurality of line array CCDs are arranged on the measured device, and is in the position that can receive the laser that the horizontal line laser instrument sends;
2) in measurement environment, carrying out the background threshold voltage demarcates
The first horizontal line laser instrument of not fetching boiling water; The output voltage of digital regulation resistance is delivered to the threshold voltage of threshold adjuster as threshold adjuster; Regulate the output voltage of digital regulation resistance; Make threshold adjuster threshold voltage near but be no more than the analog electrical signal voltage of line array CCD output, promptly do not produce the output of rect.p. string, the output voltage of the digital regulation resistance of this moment is the background threshold voltage;
3) Displacement Measurement
The horizontal line laser instrument of fetching boiling water; Regulate the output intensity of horizontal line laser instrument; Make it to surpass background threshold voltage 20% to 100%; The laser radiation that the horizontal line laser instrument sends is on line array CCD, and line array CCD sensitization pixel is exported the analog electrical pulse signal under the driving pulse effect, when output signal voltage surpasses the background threshold voltage of setting; Threshold value comparer output rect.p. string, the number of rect.p. depends on background threshold voltage and the comparative result of line array CCD output signal voltage in threshold adjuster;
4) data in real time is handled
The rect.p. string outputs in the CPU; CPU is through handling; Obtain the center of rect.p. string; CPU as corresponding with it line array CCD relative position at this moment, and is stored with the information transmission of this relative position this position in sheet external memory unit; When next rect.p. string arrives, in like manner can obtain the relative position of this line array CCD again and store it, both relatively obtain the absolute displacement of this line array CCD between two moment.
6. the noncontact micro-displacement measurement method based on line array CCD according to claim 5; Further comprising the steps of: after all position datas of the certain hour of sheet external memory unit storage; To computer control module, realize the aftertreatment of data through the RS485 bus transfer.
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| CN 201110267091 CN102419154B (en) | 2011-09-09 | 2011-09-09 | Non-contact micro displacement measuring device and method based on linear array CCD (charge coupled device) |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796689A (en) * | 2015-04-07 | 2015-07-22 | 中国科学院空间科学与应用研究中心 | Method for computing position deviation of pixels of CCD (charge coupled device) |
| CN109238143A (en) * | 2018-04-04 | 2019-01-18 | 上海市政工程设计研究总院（集团）有限公司 | The horizontal displacement variation measuring method of large scale range |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000065539A (en) * | 1998-08-19 | 2000-03-03 | Daido Steel Co Ltd | Method and device for detecting constriction of wire |
| CN1743800A (en) * | 2005-10-12 | 2006-03-08 | 浙江大学 | Micro angular displacement measuring device based on linear array charge-coupled device |
| CN101915551A (en) * | 2010-06-22 | 2010-12-15 | 北京航空航天大学 | Non-contact on-line detection device of micro gap of wire wrapped screen |
-
2011
- 2011-09-09 CN CN 201110267091 patent/CN102419154B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000065539A (en) * | 1998-08-19 | 2000-03-03 | Daido Steel Co Ltd | Method and device for detecting constriction of wire |
| CN1743800A (en) * | 2005-10-12 | 2006-03-08 | 浙江大学 | Micro angular displacement measuring device based on linear array charge-coupled device |
| CN101915551A (en) * | 2010-06-22 | 2010-12-15 | 北京航空航天大学 | Non-contact on-line detection device of micro gap of wire wrapped screen |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796689A (en) * | 2015-04-07 | 2015-07-22 | 中国科学院空间科学与应用研究中心 | Method for computing position deviation of pixels of CCD (charge coupled device) |
| CN109238143A (en) * | 2018-04-04 | 2019-01-18 | 上海市政工程设计研究总院（集团）有限公司 | The horizontal displacement variation measuring method of large scale range |
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