CN102087099B - FPGA (Field Programmable Gate Array)-based laser caliper measurement system - Google Patents
FPGA (Field Programmable Gate Array)-based laser caliper measurement system Download PDFInfo
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Abstract
The invention discloses an FPGA (Field Programmable Gate Array) based laser caliper measurement system, which is used for detecting cable diameter in real time. The system comprises an optical device, a photoelectric sensor, an amplification unit, a waveform processing unit, an analog-to-digital conversion unit, an FPGA processor and a display unit, wherein the photoelectric sensor acquires an optical image of a cable to be detected in a light path of the optical device, and the optical image is converted into an analog electric signal; the analog electric signal is converted into a digital signal after amplification, waveform processing and analog-to-digital conversion, and is transmitted to the FPGA processor; diameter data of the cable to be detected is displayed in the display unit; the FPGA processor comprises a drive module, a signal extraction module and a data display module, the signal extraction module extracts and converts the digital signal output by the analog-to-digital conversion unit, and transmits the converted data to the data display module; the data display module is electrically connected with the display unit; and the drive module drives the signal extraction module and the data display module. The FPGA-based laser caliper measurement system can reliably detect the cable diameter on line at high speed with high accuracy.
Description
Technical field
The present invention relates to the cable detection range, relate more specifically to a kind of laser diameter measurement system based on FPGA.
Background technology
In recent years; China's line cable industry development rapidly; Yet major part is not installed online detection instrument on the cable manufacturing enterprise production line of China; Still follow backward labour-intensive production model, most of cable variety production technology falls behind, the product quality consistance can't be effectively guaranteed.Estimate the in-situ measurement equipment of the important parameter of cable products quality just like external diameter, eccentric index; For the end product quality of cable products is provided, demands urgently researching and developing and to satisfy the cable diameter on-line measuring device that high Precision Detection required and adapted to high-speed production lines shake environment.
The measuring method of cable diameter has a lot, mainly is divided into two kinds of contact measurement and non-cpntact measurements.Wherein the contact measurement method have utilize directly that the size instrument is surveyed sample, electromagnetic type contact measurement etc.Measure with the size instrument, precision is not enough and measuring speed is slow, is mainly used in off-line sampling analysis occasion; Measure with electromagnetic type, measuring accuracy and speed all are difficult to be guaranteed, and also can not satisfy the requirement of measured real-time property.In recent years; The scientific research personnel has proposed non-contact type photoelectricities such as laser scanning imaging, photoelectricity projection imaging, laser diffraction and has calibrated principle; Through photoelectric sensor cable diameter information is converted into electric signal and handles, have and detect fast characteristics such as measuring accuracy height.
No matter be based on which kind of optical detection principle, its analog to digital conversion and follow-up design of signal processing are directly connected to the speed and the precision index of sensor data acquisition and processing, are requisite important steps in the pick-up unit research and development.Present most pick-up unit all be with single-chip microcomputer or digital signal processor (Digital Signal Processing is called for short DSP) as the core signal processing unit, mode through software realizes the testing flow process.Because the frequency of operation of photo electric sensitive element is often up to the number megahertzes, and the working environment of high-speed production lines and the shake of cable workpiece requires the detection time of pick-up unit short as far as possible under the online detection mode.SCM Based traditional design framework not only has strict restriction to the maximum functional dominant frequency of processor, and consumption, software systems reliability design etc. have all proposed more harsh requirement when the programmed instruction that brings under the software work mode carried out.The high speed and super precision measurement index that how under high frequency environment, to satisfy detection system is the key of pick-up unit design effort.
Therefore, be necessary to provide a kind of laser diameter measurement system to overcome above-mentioned defective based on FPGA.
Summary of the invention
The purpose of this invention is to provide a kind of laser diameter measurement system, to realize to reliable, the high-precision online detection of the high speed of cable diameter based on FPGA.
For realizing above-mentioned purpose; The invention provides a kind of laser diameter measurement system based on FPGA; Be used for detecting in real time the diameter of cable; Comprise optical devices, photoelectric sensor, amplifying unit, waveform processing unit, AD conversion unit, FPGA processor and display unit, said optical devices dock with the input end of said photoelectric sensor, and the output terminal of said photoelectric sensor is electrically connected with said amplifying unit; Said waveform processing unit is electrically connected with said amplifying unit and said AD conversion unit respectively; Said FPGA processor is electrically connected with said AD conversion unit and said display unit respectively, and cable to be measured traverses in the light path of said optical devices, said photoelectric sensor obtain cable to be measured in the light path of said optical devices optical image and convert analog electrical signal to; Said amplifying unit amplifies said analog electrical signal; The analog electrical signal of said waveform processing unit after with said amplification carries out waveform processing, and the analog electrical signal of said AD conversion unit after with waveform processing converts digital signal to and be sent to said FPGA processor, and said display unit shows the diameter data of cable to be measured; Wherein, Said FPGA processor comprises driver module, signal extraction module and data disaply moudle, and said signal extraction module is electrically connected with said AD conversion unit, driver module and said data disaply moudle respectively, and said data disaply moudle is electrically connected with said display unit; The digital signal of said AD conversion unit conversion output is extracted and handled to said signal extraction module; And the data after will handling are sent to data disaply moudle, and said data disaply moudle is electrically connected with said display unit, and said driver module drives said signal extraction module and said data disaply moudle; Said optical devices comprise semiconductor laser, collimating mirror and the condenser that is arranged in order; Said collimating mirror and said condenser are positioned on the same optical axis; Cable to be measured is between said collimating mirror and said condenser; Said semiconductor laser is positioned at the along of said collimating mirror, and said photoelectric sensor is positioned at the along of said condenser, and said semiconductor laser produces LASER Light Source and is emitted to said collimating mirror and forms directional light; The directional light that said collimating mirror forms blocks through cable to be measured and partly is incident on the condenser, and the directional light that is incident on the condenser converges on the said photoelectric sensor through condenser.
Particularly, the kernel of section of said cable to be measured be positioned on the optical axis of said collimating mirror and said condenser and said cable to be measured axially with said light shaft positive cross.Said photoelectric sensor is a charge coupled cell; The laser that said semiconductor laser produces becomes directional light through behind the collimating mirror; Directional light is during through tested cable, and a part of light is blocked by object, and all the other light focus on through condenser and shine on the charge coupled cell; The inner pixel cell (photodiode) of charge coupled cell produces voltage signal when exposure; And when backlight, do not produce signal or produce negligible dark current signals, thereby optical image is converted into the voltage signal form.
Preferably, said semiconductor laser is electrically connected with said FPGA processor and by the driver module driving and generating pulse laser of said FPGA processor.LASER Light Source adopts the working method of pulsed, and the mission life that helps prolonging semiconductor laser further improves the reliability of system.
Preferably, also comprise the warning output unit, said warning output unit is electrically connected with said FPGA processor.In said FPGA processor, can preset the cable diameter numerical value of a standard, when the diameter of institute's survey line cable and the deviation between the preset value surpass certain limit, can send alerting signal through the warning output unit, thereby can realize the function of monitoring in real time.
Preferably; Also comprise the far-end output unit, said FPGA processor also comprises serial communication module, and said driver module drives said serial communication module simultaneously; Said serial communication module is with the data-switching of said signal extraction module output and be sent to said far-end output unit; Said far-end output unit can be computing machine, and real-time monitored data information is presented on the far-end output unit, can realize long-range monitoring.
Preferably, said display unit is a charactron, selects the charactron dynamic display types, the IO resource that can save the FPGA processor, the power consumption of reduction FPGA processor.
Compared with prior art, the laser diameter measurement system based on FPGA of the present invention at first uses the laser projection imaging measuring principle, obtains the analog electrical signal of the diameter information of reflection cable to be measured; Pass through amplifying unit, waveform processing unit and AD conversion unit then; After faint analog electrical signal nursed one's health, obtain the level form of the digital signal that the FPGA processor can accept and handle, last; With the FPGA processor as core controller; Based on modular assembly framework thinking, design and develop basic function module such as driver module, signal extraction module, data disaply moudle, detection signal is carried out effective binary conversion treatment and characteristic signal extraction work; Final realization accuracy of detection reaches 17us, and detection speed reaches 10000/ second detection index performance.To be shaped on institute different with the single-chip microcomputer serial processor, and core processor of the present invention is selected FPGA, has the incident parallel processing capability; And input and output quantity is limited by self IO only; It is fast to have travelling speed, the advantage that reliability is high, and its modular assembly is the functional unit of independent definition; Can carry out independent design and deployment, and can upgrade as required and the interface expansion.Can be interconnected between the disparate modules, communicate by letter and call.The present invention adopts the design of FPGA module architectures; Control, signal Processing, demonstration and communication function are fully integrated on the FPGA processing apparatus; Saved traditional single-chip microcomputer or digital signal processing (Digital Signal Processing is called for short DSP) controller, with the testing process logic hardwareization; Efficiently solve that the time consumption spending that brings under traditional scm software processing mode is big, detection speed is slow; The problem that reliability is not high has been dwindled the volume of control device, and the real-time online that can adapt under higher line speed and the jitter of cable working environment detects.
Through following description and combine accompanying drawing, it is more clear that the present invention will become, and these accompanying drawings are used to explain embodiments of the invention.
Description of drawings
Fig. 1 is the structured flowchart of the laser diameter measurement system based on FPGA of the present invention.
Fig. 2 is the principle schematic that detects cable based on the laser diameter measurement system of FPGA of the present invention.
Fig. 3 be among Fig. 1 the FPGA processor circuit block diagram.
Fig. 4 is the wave simulation figure of driver module in the QUARTUSII7.0 simulation software among Fig. 3.
Fig. 5 carries out the principle schematic of waveform processing for waveform processing unit among Fig. 1.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, the similar elements label is represented similar elements in the accompanying drawing.
With reference to figure 1; Laser diameter measurement system based on FPGA of the present invention is used for detecting in real time the diameter of cable, comprises optical devices 20, photoelectric sensor, amplifying unit 30, waveform processing unit 40, AD conversion unit 50, FPGA processor 60 and display unit 70; In a preferred embodiment of the invention; Said photoelectric sensor adopts ccd sensor 24 (Charge-coupled Device, charge coupled cell), and said optical devices 20 dock with the input end of said ccd sensor 24; The output terminal of said ccd sensor 24 is electrically connected with said amplifying unit 30; Said waveform processing unit 40 is electrically connected with said amplifying unit 30 and said AD conversion unit 50 respectively, and said FPGA processor 60 is electrically connected with said AD conversion unit 50 and said display unit 70 respectively, and cable to be measured traverses in the light path of said optical devices 20; Said ccd sensor 24 obtain cable 10 to be measured in the light path of said optical devices 20 optical image and convert analog electrical signal to; Said amplifying unit 30 amplifies said analog electrical signal, and said amplifying unit 30 can adopt common amplifying circuit to realize, and said AD conversion unit 50; Said two-part principle and circuit diagram are well known to those skilled in the art, and do not do further elaboration at this.Said waveform processing unit 40 carries out waveform processing with the analog electrical signal after the said amplification; Said AD conversion unit 50 converts the analog electrical signal after the waveform processing to digital signal and is sent to said FPGA processor 60; Said display unit 70 shows the diameter data of said cable 10 to be measured; Wherein, Said FPGA processor 60 comprises signal extraction module 61, driver module 62 and data disaply moudle 63, and said signal extraction module 61 is connected with said AD conversion unit 50, driver module 62 and said data disaply moudle 63 respectively, and said data disaply moudle 63 is electrically connected with said display unit 70; The digital signal of said AD conversion unit 50 conversion outputs is extracted and handled to said signal extraction module 61; And the data after will handling are sent to data disaply moudle 63, and said data disaply moudle 63 is electrically connected with said display unit 7, and said driver module 62 drives said signal extraction module 61 and said data disaply moudles 63.
Cooperation is with reference to figure 2; Particularly; Said optical devices 20 comprise semiconductor laser 21, collimating mirror 22 and the condenser 23 that is arranged in order; Said collimating mirror 22 is positioned on the same optical axis C with said condenser 23, and cable 10 to be measured is between said collimating mirror 22 and said condenser 23, and said semiconductor laser 21 is positioned at the along of said collimating mirror 22; Said ccd sensor 24 is positioned at the along of said condenser 23; Said semiconductor laser 21 produces LASER Light Source and is emitted to said collimating mirror 22 and forms directional light, and the directional light that said collimating mirror 22 forms blocks through cable 10 to be measured and partly is incident on the condenser 23, and the directional light that is incident on the condenser 23 converges on the said ccd sensor 24 through condenser 23.Said LASER Light Source can incide on the collimating mirror 22 through the auxiliary adjustment correct position of elements such as catoptron.Particularly, the kernel of section of the said cable to be measured 10 optical axis C that is positioned at said collimating mirror 22 and said condenser 23 go up and said cable to be measured 10 axially with said optical axis C quadrature.The laser that said semiconductor laser 21 produces becomes directional light through behind the collimating mirror 22; Directional light is during through tested cable 10, and a part of light is blocked by object, and all the other light focus on through condenser 23 and shine on the ccd sensor 24; Ccd sensor 24 inner pixel cells (photodiode) produce voltage signal when exposure; And when backlight, do not produce signal or produce negligible dark current signals, thereby optical image is converted into the voltage signal form.The selection of the collimating mirror 22 in the optical devices 20 should guarantee enough big visual field and clear aperature; And guarantee that the light that penetrates is directional light; Lower to its imaging characteristic aspect requirement, the main optical technology parameter configuration of said collimating mirror 22 is: focal length: f=50mm; Relative aperture: D/f=1/4; Bore: D '=Φ 60mm.The main effect of said condenser 23 is to converge luminous energy, and in order to make full use of luminous energy, condenser 23 requires clear aperture bigger.The technical parameter of condenser 23 is configured to: focal length: f=10.5mmm; Bore: D=Φ 12.7mm.Said ccd sensor 24 is a kind of semiconductor devices, can be converted into analog electrical signal to optical image.The type selecting of ccd sensor 24 of the present invention is mainly considered measurement range and measuring accuracy factor.Because the measurement range of cable 10 to be detected is 1mm～20mm; Measuring accuracy requires to reach the detection requirement of 17um; Therefore when ccd sensor 24 is carried out type selecting; The preferred a chip TCD1304DG of Toshiba (Toshiba) company of the present invention, the main configuration parameter of chip is that pixel is
valid pixel number N=3648.Because the analog electrical signal of ccd sensor 24 outputs is comparatively faint, generally is no more than 0.5v.Therefore, must carry out the small-signal that ccd sensor 24 produces when making public just effectively analyzing after necessary amplification and the waveform processing.
Preferably, said semiconductor laser 21 is electrically connected with said FPGA processor 60 and by the driver module 62 driving and generating pulse lasers of said FPGA processor 60.LASER Light Source adopts the working method of pulsed, and the mission life that helps prolonging semiconductor laser 21 further improves the reliability of system.Ccd sensor 24 characterisitic parameters are measured the research of influence through the light source power spectrum; The light action of different colour temperature (power spectrum) is when device; Parameters such as the charge transfer effciency of ccd sensor 24, responsiveness R, saturated output voltage V s do not change basically; Therefore when the design light source, needn't impose and use the international standard light source, be 850nm (nanometer) infrared light supply to the comparatively responsive wavelength of ccd sensor 24 preferably in the embodiment of the invention.
Preferably, said laser diameter measurement system based on FPGA also comprises warning output unit 90, and said warning output unit 90 is electrically connected with said FPGA processor 60.In said FPGA processor 60, can set up a comparison module; Preset the cable diameter numerical value of a standard therein; When the diameter data of institute's survey line cable 10 and the deviation between the preset value surpass certain limit; Can send alerting signal through warning output unit 90,, thereby can realize the function of monitoring in real time for example through buzzer warning.
Preferably; Also comprise far-end output unit 80, said FPGA processor 60 also comprises serial communication module 64, and said driver module 62 drives said serial communication module 64 simultaneously; Said serial communication module 64 is with the data-switching of said signal extraction module 61 outputs and be sent to said far-end output unit 80; Said far-end output unit 80 can be computing machine, and real-time monitored data information is presented on the far-end output unit 80, can realize long-range monitoring.
Preferably, said display unit 70 is a charactron, selects the charactron dynamic display types, the IO resource that can save FPGA processor 60, the power consumption of reduction FPGA processor 60.
The concrete principle process of data acquisition of the present invention and signal processing is following:
TCD1304DG type ccd sensor 24 with Toshiba is the principle of work of example explanation ccd sensor 24.The technical information that provides according to CCD chip handbook; Make the CCD operate as normal; At least need 3 the road to drive, be respectively sh, icg;
signal, this 3 tunnel input can directly link to each other with the IO port of FPGA processor 60.The os signal output pin of TCD1304DG adopts the external collection of penetrating to follow the way of output, is used to reduce signal output impedance, the driving force of enhancing signal.Because the output signal of ccd sensor 24 is the analog quantity form, so after adopting high speed analog-to-digital conversion unit 50 to be converted into the digital quantity form, sends into FPGA processor 60 and carry out subsequent analysis.
With reference to figure 3; Said driver module 62 is used to produce the driving pulse of semiconductor laser 21, the driving sequential of ccd sensor 24 and the signal sampling clock of signal extraction module 61; Said driver module is made up of 2 processes, produces and export driving clock signal sh, icg, the fm of control ccd sensor 24, and input clk is the input of 20MHZ clock; Fm is 2MHZ output, and signal sampling clock clk ad frequency is 5MHZ.When ccd sensor 24 was in running order, the driving pulse light that should guarantee semiconductor laser 21 was a high level.As shown in Figure 3, the main scan module saomiao of charactron display module, 48 decoding module decore48 form.Scan module with data by individual, ten, hundred, thousand, ten thousand separate, export isolated data to duan [0..3] port by certain frequency scanning again, and this data presentation position of logarithmic code pipe is scanned simultaneously.The data of separating the scan module separation are 4bit, and the charactron video data is 8bit, and the decore4-8 code translator is a translation function of accomplishing data.Said serial communication module 64 is made up of Baud rate generator, RS-232 receiver and RS-232 transmitter.The parallel data that the RS-232 transmitter will be prepared output transfers txd train of signal line output to according to the frame format of basic asynchronous serial communication.The RS-232 receiver receives the rxd serial signal, and is translated into parallel data, because the clock of string and conversion is equally handled with transmitter, the clock between transceiver can cause receiving the incorrect of data when adding up.Therefore, the effect of Baud rate generator is to produce a local clock signal that is higher than baud rate far away specially input rxd is constantly sampled, constantly to let receiver and transmitter keep synchronously.
The quality of ccd sensor 24 output signal Processing is directly had influence on the measuring accuracy of diameter measurer, is the key point of whole design effort.Must at first clear and definite ccd sensor 24 outputs when ccd sensor 24 output signals are handled and the diameter of cable to be measured 10 between mapping relations.When the cable to be measured 10 that to a diameter is D detected, ccd sensor 24 effective pixel output signals were shown in accompanying drawing 5.Wherein L represents the imaging length of cable 10 on ccd sensor 24.Because tested cable 10 marginal existence light diffractions in projection imaging system, so there are imaging gradual change slopes in ccd sensor 24 output, the imaging border of cable 10 just this slope certain a bit on.The pixel count that comprises on ccd sensor 24 is many more, and its image detection resolution is also just high more.Photodiode produces electric charge when sensitization, the factors such as exposure intensity, optical wavelength, ambient temperature of how much following of electric charge all have substantial connection, and are the sensitivity function of exposure intensity and optical wavelength.Can know by the optical imagery theory; With the maximum rate of change point of the amplitude on ccd sensor 24 output image borders during as the boundary information of tested cable 10; The result that surveys and actual result the most approaching, be called the boundary characteristic point at this point that this amplitude change rate is maximum.For accomplishing software capture function to the signal boundary unique point; Said waveform processing unit 40 can design one and have suitable capacity push-up storage FIFO (First Input First Output; First Input First Output; Be called for short FIFO) (capacity of FIFO is amplified the width decision of back output signal boundary by ccd sensor 24 filtering), the data of sampling are passed through from FIFO; Designing a comparer again compares FIFO two end datas in real time; Obviously (the K value is confirmed by the peak VPP of CCD processor output signal after filtering is amplified when comparer records the data difference at FIFO two ends above particular value K; Generally get K=(5/6) VPP); Expression sideband signal data are in the FIFO storer; Only need FIFO internal storage data taking-up and poor to adjacent data, finding two maximum data positions of difference is that rate of change maximum point in picked up signal border is the position of boundary characteristic point.The function analytic expression of cable 10 diameter D can be expressed as as follows:
Wherein, f is the focal length of condenser 23; D is the distance parameter of grating to ccd sensor 24, is the optical system structure parameter.Result_l is ccd sensor 24 sampled data left margin results, and result_r is the right margin data processed result, and result_m is the middle data segment result.
Because the minimum resolution of cable 10 diameters to be measured reaches micron order, range is the data of 1mm～20mm, therefore needs 5 digital pipes to be used for diameter at least and shows.Can select 2 group of four figures pipes totally 8 diameter data that are used to show tested cable 10, high 3 for showing zero, and low 5 show diameter data.For saving the IO resource of FPGA, reduce the power consumption of FPGA, select the charactron dynamic display types.Even dynamically show the shared special decoding controller of all LED charactrons, every charactron is directed scan demonstration in turn one by one, because sweep velocity is exceedingly fast, display effect is identical with static control.
Compared with prior art, the laser diameter measurement system based on FPGA of the present invention at first uses the laser projection imaging measuring principle, obtains the analog electrical signal of the diameter information of reflection cable 10 to be measured; Pass through amplifying unit 30, waveform processing unit 40 and AD conversion unit 50 then; After faint analog electrical signal nursed one's health, obtain the level form of the digital signal that FPGA can accept and handle, last; With FPGA processor 60 as core controller; Based on modular assembly framework thinking, design and develop basic function module such as driver module 62, signal extraction module 61, data disaply moudle 63, detection signal is carried out effective binary conversion treatment and characteristic signal extraction work; Final realization accuracy of detection reaches 17us, and detection speed reaches 10000/ second detection index performance.To be shaped on institute different with the single-chip microcomputer serial processor, and core processor is selected FPGA, has the incident parallel processing capability, and input and output quantity limits by self IO only, and it is fast to have travelling speed, the advantage that reliability is high.Its modular assembly is the functional unit of independent definition, can carry out independent design and deployment, and can upgrade as required and the interface expansion.Can be interconnected between the disparate modules, communicate by letter and call.The present invention adopts the design of FPGA module architectures; Control, signal Processing, demonstration and communication function are fully integrated on 60 of the FPGA processors, have saved traditional single-chip microcomputer or digital signal processing (Digital Signal Processing is called for short DSP) controller; With the testing process logic hardwareization; Efficiently solve that the time consumption spending that brings under traditional scm software processing mode is big, detection speed is slow, the problem that reliability is not high has been dwindled the volume of control device; The real-time online that can adapt under higher line speed and the jitter of cable working environment detects, and satisfies the high-speed, high precision measurement index under the high frequency environment.
Invention has been described more than to combine most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, and should contain various modification, equivalent combinations of carrying out according to essence of the present invention.
Claims (7)
1. laser diameter measurement system based on FPGA; Be used for detecting in real time the diameter of cable; It is characterized in that; Comprise optical devices, photoelectric sensor, amplifying unit, waveform processing unit, AD conversion unit, FPGA processor and display unit, said optical devices dock with the input end of said photoelectric sensor, and the output terminal of said photoelectric sensor is electrically connected with said amplifying unit; Said waveform processing unit is electrically connected with said amplifying unit and said AD conversion unit respectively; Said FPGA processor is electrically connected with said AD conversion unit and said display unit respectively, and cable to be measured traverses in the light path of said optical devices, said photoelectric sensor obtain cable to be measured in the light path of said optical devices optical image and convert analog electrical signal to; Said amplifying unit amplifies said analog electrical signal; The analog electrical signal of said waveform processing unit after with said amplification carries out waveform processing, and the analog electrical signal of said AD conversion unit after with waveform processing converts digital signal to and be sent to said FPGA processor, and said display unit shows the diameter data of cable to be measured; Wherein, Said FPGA processor comprises driver module, signal extraction module and data disaply moudle, and said signal extraction module is electrically connected with said AD conversion unit, driver module and said data disaply moudle respectively, and said data disaply moudle is electrically connected with said display unit; The digital signal of said AD conversion unit conversion output is extracted and handled to said signal extraction module; And the data after will handling are sent to data disaply moudle, and said data disaply moudle is electrically connected with said display unit, and said driver module drives said signal extraction module and said data disaply moudle; Said optical devices comprise semiconductor laser, collimating mirror and the condenser that is arranged in order; Said collimating mirror and said condenser are positioned on the same optical axis; Cable to be measured is between said collimating mirror and said condenser; Said semiconductor laser is positioned at the along of said collimating mirror, and said photoelectric sensor is positioned at the along of said condenser, and said semiconductor laser produces LASER Light Source and is emitted to said collimating mirror and forms directional light; The directional light that said collimating mirror forms blocks through cable to be measured and partly is incident on the condenser, and the directional light that is incident on the condenser converges on the said photoelectric sensor through condenser.
2. the laser diameter measurement system based on FPGA as claimed in claim 1 is characterized in that, the kernel of section of said cable to be measured be positioned on the optical axis of said collimating mirror and said condenser and said cable to be measured axially with said light shaft positive cross.
3. the laser diameter measurement system based on FPGA as claimed in claim 1 is characterized in that said photoelectric sensor is a charge coupled cell.
4. the laser diameter measurement system based on FPGA as claimed in claim 1 is characterized in that, said semiconductor laser is electrically connected with said FPGA processor and by the driver module driving and generating pulse laser of said FPGA processor.
5. the laser diameter measurement system based on FPGA as claimed in claim 1 is characterized in that, also comprises the warning output unit, and said warning output unit is electrically connected with said FPGA processor.
6. the laser diameter measurement system based on FPGA as claimed in claim 1; It is characterized in that; Also comprise the far-end output unit; Said FPGA processor also comprises serial communication module, and said driver module drives said serial communication module simultaneously, and said serial communication module is with the data-switching of said signal extraction module output and be sent to said far-end output unit.
7. the laser diameter measurement system based on FPGA as claimed in claim 1 is characterized in that said display unit is a charactron.
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| CN104034273A (en) * | 2014-06-23 | 2014-09-10 | 苏州经贸职业技术学院 | Device and method for measuring and monitoring wire diameters of copper-clad steel on basis of technology of internet of things |
| CN105509646A (en) * | 2016-02-25 | 2016-04-20 | 天津高盛钢丝绳有限公司 | FPGA (field programmable gate array)-based infrared laser wire rope diameter measurement system |
| CN108646046A (en) * | 2018-07-26 | 2018-10-12 | 南京理工大学 | A kind of velocity-measuring system based on Linear array fiber space filtering and FPGA and MCU |
| CN110068278A (en) * | 2019-04-22 | 2019-07-30 | 南京理工大学 | Non-contact optical fiber preform size real-time measurement system and method based on FPGA |
| CN113210902A (en) * | 2021-05-21 | 2021-08-06 | 苏州德擎光学科技有限公司 | Laser processing detection method, device and system |
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| 阎树田，王定祥，张娜，高建国.基于FPGA的线阵CCD高速非接触检测***的研究.《电子测量技术》.2010,第33卷(第6期), * |
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