CN201993090U - Laser diameter detecting device based on FPGA (Field Programmable Gate Array) - Google Patents

Abstract

The utility model discloses a laser diameter detecting device based on an FPGA (Field Programmable Gate Array), which is used for detecting the diameter of a cable in real time and comprises an optical mechanism, a photoelectric sensor, an amplifying unit, a waveform processing unit, an analog-digital conversion unit, an FPGA processor and a display unit, wherein the photoelectric sensor is used for acquiring an optimal image of the cable to be detected in an optical path of the optical mechanism and converting the optical image into an analog electrical signal; the analog electrical signal is subjected to amplification, waveform processing and analog-digital conversion and is converted into a digital signal which is transmitted to the FPGA processor; diameter data of the cable are displayed in the display unit; the FPGA processor comprises a driving module, a signal extraction module and a data display module; the signal extraction module is used for extracting and converting the digital signal which is converted and output by the analog-digital conversion unit as well as transmitting the converted data to the data display module; the data display module is electrically connected with the display unit; and the driving module drives the signal extraction module and the data display module. The laser diameter detecting device based on the FPGA can be used for reliably detecting the diameter of the cable on line at a high speed and high precision.

Description

Laser diameter measurement device based on FPGA

Technical field

The utility model relates to the cable detection range, relates more specifically to a kind of laser diameter measurement device 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 real-time requirement of measurement.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, by 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 by 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 to satisfy detection system under high frequency environment is the key of pick-up unit design effort.

Therefore, be necessary to provide a kind of laser diameter measurement device to overcome above-mentioned defective based on FPGA.

The utility model content

The purpose of this utility model provides a kind of laser diameter measurement device based on FPGA, to realize reliable, the high-precision online detection of the high speed of cable diameter.

For achieving the above object, the utility model provides a kind of laser diameter measurement device based on FPGA, be used for detecting in real time the diameter of cable, comprise optical facilities, photoelectric sensor, amplifying unit, the waveform processing unit, AD conversion unit, FPGA processor and display unit, described optical facilities are docked with the input end of described photoelectric sensor, the output terminal of described photoelectric sensor is electrically connected with described amplifying unit, described waveform processing unit is electrically connected with described amplifying unit and described AD conversion unit respectively, described FPGA processor is electrically connected with described AD conversion unit and described display unit respectively, cable to be measured traverses in the light path of described optical facilities, described photoelectric sensor obtain cable to be measured in the light path of described optical facilities optical image and convert analog electrical signal to, described amplifying unit amplifies described analog electrical signal, the analog electrical signal of described waveform processing unit after with described amplification carries out waveform processing, the analog electrical signal of described AD conversion unit after with waveform processing converts digital signal to and is sent to described FPGA processor, described display unit shows the diameter data of cable to be measured, wherein, described FPGA processor comprises driver module, signal extraction module and data disaply moudle, described signal extraction module respectively with described AD conversion unit, driver module and described data disaply moudle are electrically connected, described data disaply moudle is electrically connected with described display unit, the digital signal of described AD conversion unit conversion output is extracted and handled to described signal extraction module, and the data after will handling are sent to data disaply moudle, described data disaply moudle is electrically connected with described display unit, and described driver module drives described signal extraction module and described data disaply moudle.

Particularly, described optical facilities comprise the semiconductor laser that is arranged in order, collimating mirror and condenser, described collimating mirror and described condenser are positioned on the same optical axis, cable to be measured is between described collimating mirror and described condenser, described semiconductor laser is positioned at the focus place of described collimating mirror, described photoelectric sensor is positioned at the focus place of described condenser, described semiconductor laser produces LASER Light Source and is emitted to described collimating mirror and forms directional light, the directional light that described 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 described photoelectric sensor through condenser.Particularly, the kernel of section of described cable to be measured be positioned on the optical axis of described collimating mirror and described condenser and described cable to be measured axially with described light shaft positive cross.Described photoelectric sensor is a charge coupled cell, the laser that described semiconductor laser produces becomes directional light through behind the collimating mirror, directional light is during through tested cable, part light is blocked by object, all the other light focus on by condenser and shine on the charge coupled cell, the pixel cell of charge coupled cell inside (photodiode) 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, described semiconductor laser is electrically connected with described FPGA processor and is driven by the driver module of described FPGA processor and produces pulse laser.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, described warning output unit is electrically connected with described FPGA processor.In described 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 by the warning output unit, thereby can realize the function of monitoring in real time.

Preferably, also comprise the far-end output unit, described FPGA processor also comprises serial communication module, described driver module drives described serial communication module simultaneously, described serial communication module is with the data-switching of described signal extraction module output and be sent to described far-end output unit, described 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, described 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, laser diameter measurement device based on FPGA of the present utility model at first uses the laser projection imaging measuring principle, obtain the analog electrical signal of the diameter information of reflection cable to be measured, pass through amplifying unit then, waveform processing unit and AD conversion unit, 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, at last, with the FPGA processor as core controller, based on modular assembly framework thinking, design and develop driver module, the signal extraction module, basic function module such as 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.With the single-chip microcomputer serial processor be shaped on the institute different, core processor of the present utility model 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 utility model adopts the design of FPGA module architectures, to 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, be called for short DSP) controller, with the testing process logic hardwareization, efficiently solving the time consumption of bringing under traditional scm software processing mode pays wages big, detection speed is slow, the problem that reliability is not high, 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.

By following description also in conjunction with the accompanying drawings, it is more clear that the utility model will become, and these accompanying drawings are used to explain embodiment of the present utility model.

Description of drawings

Fig. 1 is the structured flowchart of the laser diameter measurement device based on FPGA of the present utility model.

Fig. 2 is the principle schematic that detects cable based on the laser diameter measurement device of FPGA of the present utility model.

Fig. 3 be among Fig. 1 the FPGA processor circuit block diagram.

Fig. 4 is the wave simulation figure of driver module in QUARTUS II 7.0 simulation softwares 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 embodiment of the present utility model, the similar elements label is represented similar elements in the accompanying drawing.

With reference to figure 1, laser diameter measurement device based on FPGA of the present utility model, be used for detecting in real time the diameter of cable, comprise optical facilities 20, photoelectric sensor, amplifying unit 30, waveform processing unit 40, AD conversion unit 50, FPGA processor 60 and display unit 70, in preferred embodiment of the present utility model, described photoelectric sensor adopts ccd sensor 24 (Charge-coupled Device, charge coupled cell), described optical facilities 20 are docked with the input end of described ccd sensor 24, the output terminal of described ccd sensor 24 is electrically connected with described amplifying unit 30, described waveform processing unit 40 is electrically connected with described amplifying unit 30 and described AD conversion unit 50 respectively, described FPGA processor 60 is electrically connected with described AD conversion unit 50 and described display unit 70 respectively, cable to be measured traverses in the light path of described optical facilities 20, described ccd sensor 24 obtain cable 10 to be measured in the light path of described optical facilities 20 optical image and convert analog electrical signal to, described amplifying unit 30 amplifies described analog electrical signal, described amplifying unit 30 can adopt common amplifying circuit to realize, and described AD conversion unit 50, described two-part principle and circuit diagram are well known to those skilled in the art, and are not further elaborated at this.Described waveform processing unit 40 carries out waveform processing with the analog electrical signal after the described amplification, described AD conversion unit 50 converts the analog electrical signal after the waveform processing to digital signal and is sent to described FPGA processor 60, described display unit 70 shows the diameter data of described cable 10 to be measured, wherein, described FPGA processor 60 comprises signal extraction module 61, driver module 62 and data disaply moudle 63, described signal extraction module 61 respectively with described AD conversion unit 50, driver module 62 and described data disaply moudle 63 connect, described data disaply moudle 63 is electrically connected with described display unit 70, the digital signal of described AD conversion unit 50 conversion outputs is extracted and handled to described signal extraction module 61, and the data after will handling are sent to data disaply moudle 63, described data disaply moudle 63 is electrically connected with described display unit 7, and described driver module 62 drives described signal extraction module 61 and described data disaply moudle 63.

Cooperation is with reference to figure 2, particularly, described optical facilities 20 comprise the semiconductor laser 21 that is arranged in order, collimating mirror 22 and condenser 23, described collimating mirror 22 is positioned on the same optical axis C with described condenser 23, cable 10 to be measured is between described collimating mirror 22 and described condenser 23, described semiconductor laser 21 is positioned at the focus place of described collimating mirror 22, described ccd sensor 24 is positioned at the focus place of described condenser 23, described semiconductor laser 21 produces LASER Light Source and is emitted to described collimating mirror 22 and forms directional light, the directional light that described 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 described ccd sensor 24 through condenser 23.Described LASER Light Source can incide on the collimating mirror 22 by the auxiliary adjustment correct position of elements such as catoptron.Particularly, the kernel of section of the described cable to be measured 10 optical axis C that is positioned at described collimating mirror 22 and described condenser 23 go up and described cable to be measured 10 axially with described optical axis C quadrature.The laser that described semiconductor laser 21 produces becomes directional light through behind the collimating mirror 22, directional light is during through tested cable 10, part light is blocked by object, all the other light focus on by condenser 23 and shine on the ccd sensor 24, the pixel cell (photodiode) of ccd sensor 24 inside 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.The selection of the collimating mirror 22 in the optical facilities 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 described collimating mirror 22 is: focal length: f=50mm; Relative aperture: D/f=1/4; Bore: D '=Φ 60mm.The main effect of described 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.Described 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 utility model 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 utility model, 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 exposing just effectively analyzing after necessary amplification and the waveform processing.

Preferably, described semiconductor laser 21 is electrically connected with described FPGA processor 60 and is driven by the driver module 62 of described FPGA processor 60 and produces pulse lasers.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 by 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 needn't impose when the design light source and use the international standard light source, be 850nm (nanometer) infrared light supply to the comparatively responsive wavelength of ccd sensor 24 preferably among the utility model embodiment.

Preferably, described laser diameter measurement device based on FPGA also comprises warning output unit 90, and described warning output unit 90 is electrically connected with described FPGA processor 60.In described 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 by warning output unit 90, for example pass through buzzer warning, thereby can realize the function of monitoring in real time.

Preferably, also comprise far-end output unit 80, described FPGA processor 60 also comprises serial communication module 64, described driver module 62 drives described serial communication module 64 simultaneously, described serial communication module 64 is with the data-switching of described signal extraction module 61 outputs and be sent to described far-end output unit 80, described 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, described 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 utility model and signal processing is as follows:

TCD1304DG type ccd sensor 24 with Toshiba is the principle of work of example explanation ccd sensor 24.Technical information according to CCD chip handbook provides will make the CCD operate as normal, needs 3 the road to drive at least, is 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, described 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, described driver module is made up of 2 processes, produce and export driving clock signal sh, icg, the fm of control ccd sensor 24, 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 decore4_8 form.Scan module with data by individual, ten, hundred, thousand, ten thousand separate, export isolated data to duan[0..3 by certain frequency scanning again] port, 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 finishing data.Described serial communication module 64 is made 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 allow receiver and transmitter keep synchronously.

Driver module 62 is obtained waveform shown in Figure 4 after carrying out wave simulation in QUARTUS II 7.0 simulation softwares.

The quality that ccd sensor 24 output signals are handled directly has influence on the measuring accuracy of diameter measurer, is the key point of whole design effort.Must be at first clear and definite when ccd sensor 24 output signals are handled mapping relations between the diameter of ccd sensor 24 outputs and cable to be measured 10.When the cable to be measured 10 that to a diameter is D detected, ccd sensor 24 effective pixel output signals as shown in Figure 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 is imaging gradual change slope 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.By the optical imagery theory as can be known, 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, measured result and actual result are the most approaching, are called the boundary characteristic point at this point with this amplitude change rate maximum.For finishing software capture function to the signal boundary unique point, described 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 on output signal border, back by ccd sensor 24 filtering), the data of sampling are passed through from FIFO; Designing a comparer again compares in real time to FIFO two end datas, obviously (the K value is determined by the peak-to-peak value voltage 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, two data positions finding the difference maximum are that the point of picked up signal border rate of change maximum is the position of boundary characteristic point.Shown in the function analytic expression of cable 10 diameter D can be expressed as:

$D=\frac{f}{d}\×(\mathrm{resualt}\_l+\mathrm{resualt}\_m-\mathrm{resualt}\_r)$

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, laser diameter measurement device based on FPGA of the present utility model at first uses the laser projection imaging measuring principle, obtain the analog electrical signal of the diameter information of reflection cable 10 to be measured, pass through amplifying unit 30 then, waveform processing unit 40 and AD conversion unit 50, after faint analog electrical signal nursed one's health, obtain the level form of the digital signal that FPGA can accept and handle, at last, with FPGA processor 60 as core controller, based on modular assembly framework thinking, design and develop driver module 62, signal extraction module 61, basic function module such as 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 utility model adopts the design of FPGA module architectures, to control, signal Processing, show and communication function is fully integrated on 60 of the FPGA processors, saved traditional single-chip microcomputer or digital signal processing (Digital Signal Processing, be called for short DSP) controller, with the testing process logic hardwareization, efficiently solving the time consumption of bringing under traditional scm software processing mode pays wages big, detection speed is slow, the problem that reliability is not high, 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.

Abovely the utility model is described, but the utility model is not limited to the embodiment of above announcement, and should contains various modification, equivalent combinations of carrying out according to essence of the present utility model in conjunction with most preferred embodiment.

Claims (8)

1. laser diameter measurement device based on FPGA, be used for detecting in real time the diameter of cable, it is characterized in that, comprise optical facilities, photoelectric sensor, amplifying unit, the waveform processing unit, AD conversion unit, FPGA processor and display unit, described optical facilities are docked with the input end of described photoelectric sensor, the output terminal of described photoelectric sensor is electrically connected with described amplifying unit, described waveform processing unit is electrically connected with described amplifying unit and described AD conversion unit respectively, described FPGA processor is electrically connected with described AD conversion unit and described display unit respectively, cable to be measured traverses in the light path of described optical facilities, described photoelectric sensor obtain cable to be measured in the light path of described optical facilities optical image and convert analog electrical signal to, described amplifying unit amplifies described analog electrical signal, the analog electrical signal of described waveform processing unit after with described amplification carries out waveform processing, the analog electrical signal of described AD conversion unit after with waveform processing converts digital signal to and is sent to described FPGA processor, described display unit shows the diameter data of cable to be measured, wherein, described FPGA processor comprises driver module, signal extraction module and data disaply moudle, described signal extraction module respectively with described AD conversion unit, driver module and described data disaply moudle are electrically connected, described data disaply moudle is electrically connected with described display unit, the digital signal of described AD conversion unit conversion output is extracted and handled to described signal extraction module, and the data after will handling are sent to data disaply moudle, described data disaply moudle is electrically connected with described display unit, and described driver module drives described signal extraction module and described data disaply moudle.

2. the laser diameter measurement device based on FPGA as claimed in claim 1, it is characterized in that, described optical facilities comprise the semiconductor laser that is arranged in order, collimating mirror and condenser, described collimating mirror and described condenser are positioned on the same optical axis, cable to be measured is between described collimating mirror and described condenser, described semiconductor laser is positioned at the focus place of described collimating mirror, described photoelectric sensor is positioned at the focus place of described condenser, described semiconductor laser produces LASER Light Source and is emitted to described collimating mirror and forms directional light, the directional light that described 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 described photoelectric sensor through condenser.

3. the laser diameter measurement device based on FPGA as claimed in claim 2 is characterized in that, the kernel of section of described cable to be measured be positioned on the optical axis of described collimating mirror and described condenser and described cable to be measured axially with described light shaft positive cross.

4. the laser diameter measurement device based on FPGA as claimed in claim 1 is characterized in that described photoelectric sensor is a charge coupled cell.

5. the laser diameter measurement device based on FPGA as claimed in claim 2 is characterized in that, described semiconductor laser is electrically connected with described FPGA processor and is driven by the driver module of described FPGA processor and produces pulse laser.

6. the laser diameter measurement device based on FPGA as claimed in claim 1 is characterized in that, also comprises the warning output unit, and described warning output unit is electrically connected with described FPGA processor.

7. the laser diameter measurement device based on FPGA as claimed in claim 1, it is characterized in that, also comprise the far-end output unit, described FPGA processor also comprises serial communication module, described driver module drives described serial communication module simultaneously, and described serial communication module is with the data-switching of described signal extraction module output and be sent to described far-end output unit.

8. the laser diameter measurement device based on FPGA as claimed in claim 1 is characterized in that described display unit is a charactron.

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