CN109916307A - Variable power laser measurement method and device - Google Patents
Variable power laser measurement method and device Download PDFInfo
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- CN109916307A CN109916307A CN201811611653.8A CN201811611653A CN109916307A CN 109916307 A CN109916307 A CN 109916307A CN 201811611653 A CN201811611653 A CN 201811611653A CN 109916307 A CN109916307 A CN 109916307A
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Abstract
The invention discloses variable power laser measurement method and device, which includes photoelectricity CCD imaging system, parallel data processing system, Laser Driven system three parts.The Laser Driven system carries out dynamic adjustment by the photoelectricity CCD imaging system feedback signal, reaches the characteristic of system self-adaption optimization.The parallel data processing system carries out control and Data Analysis Services to the Laser Driven system and the photoelectricity CCD imaging system.The present invention can flexible expansion measured target detection range, accurate description upper and lower surface profile band reduces the influence of high temperature, dust, different reflecting surface to measured target measurement result on line, improves measurement accuracy and stability；Structure is simple, high resolution, is not necessarily to frequent routine calibration, and manufacturing expense is low, easy to maintain, significantly attenuating daily maintenance time and cost.
Description
Technical field
The present invention relates to a kind of on-line automatic measuring device of industry, in particular to variable power laser measurement system technology is ground
Study carefully.
Background technique
Measurement application method uses laser triangulation formula imaging type measurement method at present, it is to pass through laser transmitting system
Visible light, through light path imaging on photoelectric converter (CCD or other photoelectric devices), photoelectric converter are issued to measured target
Target picture is converted to electric signal by part, and processing circuit calculates the position of target picture, and data system calculates the upper and lower of measured object
Surface location, alternate position spike are exactly measured object thickness, width and length information.Existing laser measuring apparatus is that upper and lower CCD receives system
System synchro measure target, this requires the upper and lower reception systems of photoelectricity CCD imaging system must keep the synchronous time for exposure.?
Different targets, live dust and target are measured when roller-way jolts transmission, will cause photoelectricity CCD imaging system
Upper and lower reception system receives to be had differences in energy of lasers, will lead to photoelectricity CCD imaging system under synchronous time for exposure mode
The signal of system generates saturation or too low phenomenon, brings error even measuring error to measurement result.
Summary of the invention
1. technical problems to be solved
For the deficiencies in the prior art, the present invention is unrestrained according to the target laser that photoelectricity CCD imaging system receives
Reflection power, adaptive to adjust laser drive current to change laser output power, the solution synchronous time for exposure brings
Photoelectricity ccd signal saturation or too low problem.
2. technical solution
To achieve the goals above, present invention employs following technical solutions:
Variable power laser measuring device for measuring, including photoelectricity CCD imaging system, parallel data processing system and laser driving
System, the photoelectricity CCD imaging system include laser, CCD driving circuit, ccd data processing circuit；Photoelectricity CCD imaging
System is to measure work by the triangle optical imaging system of composition, and measured target is under the auxiliary of laser beam on CCD
Silhouette target is formed, which forms analyzable electric signal by ccd data processing circuit.The photoelectricity CCD is surveyed
Amount imaging system is connected with the parallel data processing system, the telecommunications of the photoelectricity CCD measurement imaging system output
It number is output to the parallel data processing system to be analyzed and processed, the final measurement data for obtaining measured target.Described
Laser driving system is connected with the photoelectricity CCD imaging system, the laser driving system driving light
The laser of electric CCD imaging system generates the laser beam of different capacity.The photoelectricity CCD imaging system is according to ccd signal shape
State and parameter comparison analysis issue feedback adjustment signal to the laser driving system, realize that CCD imaging effect is best,
Meet external condition and the matched functional requirement of multichannel.So that entire measuring system realizes that adaptivity adjusts function, reach pair
The applicability and system stability of change of external conditions.
Preferably, there is the photoelectricity CCD imaging system ccd signal to analyze processing function, and can be according to processing
As a result processing is optimized to ccd signal, feedback control function is formed to Laser Driven system.
Preferably, the parallel data processing system is multichannel process parallel system, being capable of photoelectricity CCD to multichannel
Imaging system signal carries out comprehensive analysis processing, realizes the consistent characteristic of coordinate synchronization of system multi-channel measurement target.
Preferably, the Laser Driven system receives instruction, calculates corresponding current value, realizes laser power one
Determine range output to change, power stability is≤2mw.
Preferably, the laser wavelength be 405nm, power bracket 20-60mW, current feedback information 190-400,
Each step-length is 10, signal breadth≤50us, threshold value 100.
Preferably, CCD is linear charge-coupled device.
Variable power laser measurement method, comprising the following steps:
Step 1, the photoelectricity CCD imaging system measures target information, CCD number by laser assisted triangle optical system
CCD unit number shared by echo signal is calculated according to processing circuit, Xiang Suoshu parallel data processing system sends data；
Step 2, the feedback information that the parallel data processing system is provided according to photoelectricity CCD imaging system, passes through data
Parallel transmission mode coordinates multiple and different Laser Driven systems and exports corresponding current value；
Step 3, Laser Driven system-computed goes out corresponding current value, and driving laser output power reaches its respective value,
To adapt to threshold value set by photoelectricity CCD imaging system；
Step 4, the above-mentioned course of work, dynamic adjust repeatedly, until laser power adapts to the letter of photoelectricity CCD imaging system
Number threshold value.
3. beneficial effect
Compared with the prior art, the present invention has the advantages that can flexible expansion measured target detection range, accurate description
Upper and lower surface profile band reduces the influence of high temperature on line, dust, different reflectings surface to measured target measurement result, improves measurement
Precision stability；Structure is simple, high resolution, is not necessarily to frequent routine calibration, and manufacturing expense is low, easy to maintain, significantly attenuating day
Normal maintenance time and cost.
Detailed description of the invention
Fig. 1 shows the block diagram of variable power laser measurement method；
Fig. 2 shows the schematic diagrames of photoelectricity CCD imaging system in Fig. 1；
Fig. 3 shows the schematic diagram of signal processing in Fig. 2；
Fig. 4 shows the schematic diagram of the acquisition process of the position counting value of laser signal processor in Fig. 2；
Fig. 5 shows the schematic diagram of Fig. 1 data parallel system；
Fig. 6 shows the schematic diagram of Laser Driven system in Fig. 1；
Fig. 7 shows feedback information and laser power relation schematic diagram in Fig. 6；
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Example 1:
Use laser wavelength for 405nm, power bracket 20-60mW, current feedback information 190-400, every hyposynchronization
A length of 10, signal breadth≤50us, threshold value 100.
As shown in Figure 1, variable power laser measuring device for measuring, including photoelectricity CCD imaging system, Parallel Data Transmission System,
Laser Driven system.The photoelectricity CCD imaging system is as shown in Fig. 2, photoelectricity CCD imaging system is the laser by certain angle
It is formed with CCD imaging system, constitutes laser triangulation, signal processing is as shown in figure 3, include CCD driving and CCD letter
Number processing system, measures target information by laser triangulation, and target is imaged on CCD by diffusing reflection, and processing unit is logical
Algorithm detection ccd signal breadth is crossed, as shown in figure 4, obtaining Amplitude Width, due to laser power difference, obtains breadth also not
Together, feedback information is provided according to given threshold, setting electric current feedback information sends to parallel data processing unit and instructs, and increases
Or reduce laser power；
As the processing method of Fig. 4 Amplitude Width is: CCD is linear charge-coupled device, in actually detected, object point, as
Point is that correspondingly, the initial position of image point is N1, end position N2, then the width of signal is N=N2-N1；Due to letter
Measurement was imitated most preferably when number symmetrical and amplitude is 50us, and the corresponding count value of signal breadth 50us is 100, and threshold value is arranged and is
100；With width N is crossed compared with 100, laser power is reduced in N > 100；N < 100 increase laser power；Current control from
190-400, adding and subtracting step-length every time is 10.
Be illustrated in figure 5 parallel data processing system, receive imaging system feedback information, by write different address to
Different laser driving plate transmissions increase or decrease laser power instruction；
It is illustrated in figure 6 Laser Driven system, receives corresponding instruction, driving laser electricity is calculated according to formula (1)
Stream, to reach change laser power, whole system realizes closed-loop system.In order to more effectively control and adjust laser function
Rate, Laser Driven system are the digital adjustable current sources based on ARM, and single-chip microcontroller is led to main control unit by serial ports RS422
News；Its current control and laser power corresponding relationship such as Fig. 7.
As electric current with current feedback information relationship is in Fig. 6
Wherein Code is feedback current information, its current value is arranged by above formula.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (3)
1. variable power laser measuring device for measuring, including photoelectricity CCD imaging system, parallel data processing system and laser driving system
System, it is characterised in that: the output of the Laser Driven system can be according to the feedback information of the photoelectricity CCD imaging system
It is adjusted.The photoelectricity CCD imaging system can be analyzed according to the output of the Laser Driven system, the two shape
At closed loop self-adjusting system.
2. Variable power laser measuring device for measuring according to claim 1, it is characterised in that: the parallel data processing system
The information of the photoelectricity CCD imaging system is analyzed, the signal fed back to it is led to by the way of multidiameter delay processing
It crosses the Laser Driven system and carries out Coordination Treatment.
3. variable power laser measurement method, which comprises the following steps:
Step 1, the photoelectricity CCD imaging system measures target information by laser assisted triangle optical system, at ccd data
Reason circuit counting goes out CCD unit number shared by echo signal, and Xiang Suoshu parallel data processing system sends data；
Step 2, the feedback information that the parallel data processing system is provided according to photoelectricity CCD imaging system, passes through data parallel
Transmission mode coordinates multiple and different Laser Driven systems and exports corresponding current value；
Step 3, Laser Driven system-computed goes out corresponding current value, and driving laser output power reaches its respective value, with suitable
Answer threshold value set by photoelectricity CCD imaging system；
Step 4, the above-mentioned course of work, dynamic adjust repeatedly, until laser power adapts to the signal threshold of photoelectricity CCD imaging system
Value.
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| CN201811611653.8A CN109916307A (en) | 2018-12-27 | 2018-12-27 | Variable power laser measurement method and device |
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| CN103884284A (en) * | 2012-12-20 | 2014-06-25 | 上海砺晟光电技术有限公司 | Embedded laser displacement sensor and normalization processing method thereof |
| CN104901158A (en) * | 2015-05-21 | 2015-09-09 | 常州华达科捷光电仪器有限公司 | Control circuit used for laser module group and laser collimator with control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60256079A (en) * | 1984-06-01 | 1985-12-17 | Sharp Corp | Minute displacement measuring apparatus using semiconductor laser |
| US4796996A (en) * | 1987-08-14 | 1989-01-10 | American Telephone And Telegraph Company, At&T Bell Laboratories | Laser temperature modulation and detection method |
| CN1215151A (en) * | 1998-07-11 | 1999-04-28 | 中国科学院安徽光学精密机械研究所 | Laser on-line testing and checking apparatus for rubber element outline |
| CN1667354A (en) * | 2004-03-09 | 2005-09-14 | 株式会社电装 | Object detecting apparatus having light radiation power regulating function |
| CN102203550A (en) * | 2008-10-28 | 2011-09-28 | 3形状股份有限公司 | Scanner with feedback control |
| CN201569414U (en) * | 2009-11-24 | 2010-09-01 | 上海实甲电子科技有限公司 | Diameter detection sensor |
| CN102087100A (en) * | 2010-11-23 | 2011-06-08 | 东莞市日新传导科技股份有限公司 | FPGA (Field Programmable Gate Array) based laser diameter measuring method |
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| CN103884284A (en) * | 2012-12-20 | 2014-06-25 | 上海砺晟光电技术有限公司 | Embedded laser displacement sensor and normalization processing method thereof |
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