CN108317964A - A kind of contactless caliper of LED light source - Google Patents
A kind of contactless caliper of LED light source Download PDFInfo
- Publication number
- CN108317964A CN108317964A CN201710030700.9A CN201710030700A CN108317964A CN 108317964 A CN108317964 A CN 108317964A CN 201710030700 A CN201710030700 A CN 201710030700A CN 108317964 A CN108317964 A CN 108317964A
- Authority
- CN
- China
- Prior art keywords
- light source
- led light
- led
- ccd sensor
- linear ccd
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
Abstract
The present invention provides a kind of measuring devices based on information such as LED light source non-contact detecting article diameters, thickness.Caliper is made of LED light source parallel light tube, linear CCD sensor and image processing system, and testee is placed between LED light source parallel light tube and linear CCD sensor, carries out non-contact measurement.Light-emitting LED diode forms directional light after a series of optical mirror slips and aperture, and it is irradiated to testee, it finally projects linear CCD sensor and optical signal is converted into electric signal, digital image processing system handles electric signal, and handling result is shown by display system.
Description
Technical field
The present invention provides a kind of measuring devices based on information such as LED light source non-contact detecting article diameters, thickness.
Background technology
Testee, is typically compared by the mechanical detection instrument that early stage uses with canonical measure utensil, to
Obtain measurement result, this method is more intuitive, but measurement accuracy is relatively low.Most of mechanical gages are all contacts
Formula measures, its advantage is that measurement is simple to operate, manufacturing cost is low, wide range of measurement；The disadvantage is that testee when measuring
There is certain damage, be unable to measure flexible and elastomeric objects, and cannot achieve dynamic and measure, measurement efficiency is low.Common machinery
Formula micrometer instrument has vernier caliper, micrometer etc..
The measuring principle of telescope callipers device is to project light beams upon testee, and measured object is received by sensitive component
The projection of body；The signal that sensitive component is obtained carry out electronic operation processing calculate projection or picture size can be obtained by
Survey the size of object.
In 102087100 A of Chinese patent document CN, the directional light used is pulse laser, and directional light is by be measured
Cable blocks and part is projected after being converged, and finally projects photoelectric sensor and is converted to analog electrical signal, finally uses
FPGA carries out processing and operation to signal.A set of optical imaging lens, cost are needed between testee and photoelectric sensor
It is higher.
In 103673906 B of Chinese patent document CN, it is irradiated to be formed on polygonal tilting mirror using laser beam and swashs
Optical scanning sector carries out the measurement of large aperture workpiece outer diameter, and the outer diameter of workpiece depends on the rotary speed of polygonal-mirror, to electricity
The stability requirement of machine is very high.
Existing optical non-contact diameter measurer has two classes：First, using laser as light source, light passes through measured object
After body, it is imaged onto on imaging sensor by optical lens；Second is that the prism using rotation forms laser scanning beam, to measured object
Swept-volume detects.That all there is volumes is big for above-mentioned apparatus, it is of high cost the problems such as, so that optics diameter measurer is unable to get and be widely popularized
With use.
Invention content
The detailed description of the invention realization thought and implementation of the contactless caliper based on Digital Image Processing.
The contactless caliper of LED light source of complete set is made of following three parts：
1.LED source parallel light pipes：Be made of Light-emitting diode LED, optical mirror slip, aperture and lens barrel form, LED is sent out
Light directional light is formed after a series of optical mirror slips and aperture, directional light is irradiated to testee, finally directly projection
To linear CCD sensor.
2. linear CCD sensor：The light that parallel light tube is sent out, optical signal is converted into electric signal after testee, and
Result is transmitted to digital image processing system.
3. digital image processing system：The electric signal that linear CCD sensor transmits is handled, and handling result is led to
Display system is crossed to show.
Fig. 1 is the fundamental diagram of caliper.
Fig. 2 is the structure principle chart of parallel light tube.
Fig. 3 is pixel photoreceptor signal coordinate diagram.
Fig. 4 is pixel photoreceptor signal coordinate partial enlarged view.
Fig. 5 is Digital Image Processing program flow diagram.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, the contactless caliper of the LED light source includes parallel light tube 1 and linear CCD sensor 3, number
Word image processing system 5 and display system 6, the directional light that wherein parallel light tube 1 is sent out are irradiated on testee 2, directional light
It finally projects on linear CCD sensor 3, and the directional light that sends out of parallel light tube 1 and linear CCD sensor 3 are orthogonal；Institute
State the internal structure principle of parallel light tube 1 as shown in Fig. 2, parallel light tube 1 by LED light source 7, planoconvex spotlight 8, aspherical mirror 9, in
The heart is made of the sheet metal 10, planoconvex spotlight 11 and optical filter 12 of light transmission circular hole, and wherein the focal length of planoconvex spotlight 8 is f1, aspheric
The focal length of face mirror 9 is f2, the focal length of planoconvex spotlight 11 is f3, LED light source 7 is placed in the focus of planoconvex spotlight 8, and center has
The sheet metal 10 of light circular hole is placed in the focus of aspherical mirror 9 and planoconvex spotlight 11, and all homocentric placements of above-mentioned device.
System work is described further in conjunction with Fig. 3, Fig. 4 and Fig. 5.
The optical image signal of testee 2 is converted to discrete voltage signal by linear CCD sensor 3, wherein each
Discrete voltage signal corresponds to the size of a received light intensity of pixel, and discrete voltage signal is number by A/D sample conversions
Word picture signal, the sequential of output then correspond to the sequence of linear CCD sensor pixel position.Abscissa is the position of pixel in Fig. 3
Sequence is set, ordinate is the corresponding voltage value of pixel, and Fig. 4 is the partial enlargement of Fig. 3.UhFor bright level, UlFor black level, UmFor
Judge the edge threshold voltage of testee, XmCentered on pixel position, XstartAnd XendBe testee edge it is corresponding
The position coordinates of pixel.The influence of voltage fluctuation, enables U when in order to eliminate ambient light and LED light source workm=a × Uh+b×Ul,
Wherein a, b are weighting coefficient, UhAnd UlCollected real-time voltage when working for system.Fig. 5 illustrates the digitized map of detecting system
As processing routine flow, digital image processing system 5 generates the required time series pulse signals of line array CCD work first, and right
The light of object to be detected carries out opto-electronic conversion, and then carrying out AD by the sequence of the position of pixel to the voltage of each pixel turns
It changes；Bright level U is respectively obtained by edge pixel and center pelhWith black level Ul, and according to Um=a × Uh+b×UlObtain edge
Threshold value Um.By the center X of pixelmTwo edge pixel positions for judging testee are proceeded by, U is worked asx>UmWhen, it obtains
Edge pixel position is respectively XstartAnd Xend, the size for finally obtaining testee are (Xend-Xstart) × pixel dimension,
And result is shown by display system 6.
Claims (3)
1. a kind of contactless caliper of LED light source, which is characterized in that including LED light source parallel light tube, linear CCD sensor
And digital image processing system, it is characterised in that：LED light source parallel light tube and linear CCD sensor are mutually perpendicular to place；It is described
LED light source parallel light tube is made of Light-emitting diode LED, optical mirror slip, aperture and lens barrel form, and the light that LED is sent out passes through
Directional light is formed after a series of optical mirror slips and aperture, directional light is irradiated to testee, is finally projected directly at line array CCD biography
Sensor；The light that parallel light tube is sent out, the optical signal after testee is converted into electric signal, and handle to the linear CCD sensor
As a result it is transmitted to digital image processing system；The electric signal that the digital image processing system transmits linear CCD sensor into
Row processing, and handling result is shown by display system.
2. the contactless caliper of a kind of LED light source according to claim 1, it is characterised in that：LED light source parallel light tube
By LED light source, planoconvex spotlight, aspherical mirror, center have the sheet metal, planoconvex spotlight and filter set of light transmission circular hole at.
3. the contactless caliper of a kind of LED light source according to claim 1, it is characterised in that：Digital Image Processing system
System to testee carry out edge detection when, edge threshold voltage when being worked by system collected real-time voltage be weighted fortune
It obtains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710030700.9A CN108317964A (en) | 2017-01-16 | 2017-01-16 | A kind of contactless caliper of LED light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710030700.9A CN108317964A (en) | 2017-01-16 | 2017-01-16 | A kind of contactless caliper of LED light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108317964A true CN108317964A (en) | 2018-07-24 |
Family
ID=62891774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710030700.9A Pending CN108317964A (en) | 2017-01-16 | 2017-01-16 | A kind of contactless caliper of LED light source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108317964A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109751964A (en) * | 2019-01-30 | 2019-05-14 | 苏州科技大学 | A kind of contactless Calibration method and device of high-precision |
| RU2783678C1 (en) * | 2021-10-15 | 2022-11-15 | Федеральное государственное бюджетное учреждение науки Институт теплофизики им. С.С. Кутателадзе Сибирского отделения Российской академии наук | Optoelectronic method for measuring the diameter of a cylindrical object |
-
2017
- 2017-01-16 CN CN201710030700.9A patent/CN108317964A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109751964A (en) * | 2019-01-30 | 2019-05-14 | 苏州科技大学 | A kind of contactless Calibration method and device of high-precision |
| RU2783678C1 (en) * | 2021-10-15 | 2022-11-15 | Федеральное государственное бюджетное учреждение науки Институт теплофизики им. С.С. Кутателадзе Сибирского отделения Российской академии наук | Optoelectronic method for measuring the diameter of a cylindrical object |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180724 |
|
| WD01 | Invention patent application deemed withdrawn after publication |