CN212207138U - Polarization uniform parallel light generating device and automatic optical detection system - Google Patents
Polarization uniform parallel light generating device and automatic optical detection system Download PDFInfo
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- CN212207138U CN212207138U CN202020868488.0U CN202020868488U CN212207138U CN 212207138 U CN212207138 U CN 212207138U CN 202020868488 U CN202020868488 U CN 202020868488U CN 212207138 U CN212207138 U CN 212207138U
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Abstract
The utility model discloses a polarization uniform parallel light generating device and an automatic optical detection system, wherein the device comprises a light source, a light beam uniform and parallel component, a first polarizer, a semi-transparent and semi-reflective mirror and a second polarizer; the light beam uniformity and parallelism component processes the light source emergent light beam to form parallel light; the parallel light penetrates through the first polarizer to form linearly polarized light, and the linearly polarized light which is emitted to the semi-transparent semi-reflective mirror is reflected and vertically irradiated on the surface of an article to be measured; after the linearly polarized light and the surface defects of the object to be measured act, scattered light with changed polarization state and specular reflection light with unchanged polarization state are generated; the scattered light and the specular reflection light are transmitted to a second polarizer after passing through the semi-transparent semi-reflective mirror, and the polarization direction of the second polarizer is configured to be 90 degrees with the first polarizer so as to filter the specular reflection light and allow the scattered light to pass through; the utility model discloses effective filtering influences great specular reflection light and does not influence normal defect formation of image to the defect detection, improves sensitivity and resolving power to defect information.
Description
Technical Field
The utility model belongs to the technical field of the optical detection, more specifically relates to a polarization uniform parallel light produces device and automatic optical detection system.
Background
The automatic optical detection means that an optical imaging technology is adopted to obtain an image of a detected target, and information such as the size, the position, the direction, the spectral characteristics, the structure, the defects and the like of the target is obtained from the shot image through a rapid image processing and image recognition algorithm, so that tasks such as product inspection, part identification and positioning on an assembly line, measurement in process monitoring, process control feedback, classification, grouping and the like can be executed.
The light source lighting technology relates to lighting method and lighting technique, and determines the information type of the target which can be shot by the automatic optical detection system. In the defect detection process, the light can be better reflected to the camera lens by the flat object surface area of the surface of the detected target, and the light on the uneven object surface area (defect position) is obliquely reflected (scattered) to other directions, so that a dark area appears in an image shot by the camera to form defect information. The sensitivity and resolving power of the camera to defect information can be seriously influenced by the change of illumination, particularly, the complex surface with larger change of curvature and stronger optical reflectivity is detected, and the selection of a light source and the lighting skill are more important. In order to improve the contrast of defect information in a captured image and further improve the accuracy of defect detection, when a detected target is detected, the parallelism and uniformity of a light source must be ensured, and the specular reflection light on the surface of the detected target needs to be inhibited.
Fig. 1 is a schematic structural diagram of a lighting device commonly used in the prior art, and as shown in fig. 1, the lighting device is composed of a light source 1, a diffusion plate 2, a beam splitter 3, a light absorption plate 4, a dust-proof sheet 5 and a heat sink 6. Light emitted by the light source 1 is changed into uniform light through the diffusion plate 2 and irradiates the spectroscope 3, half of the light irradiates the left side wall through the spectroscope 3, and the part of the light is absorbed and cannot enter the camera, so that imaging is not influenced; the other half of the light is reflected to the object to be measured below through the spectroscope 3, after the light reflected from the surface of the object is irradiated to the spectroscope 3, part of the light directly enters the camera through the spectroscope 3, and the part of the light is used for imaging; another part of the light is reflected back to the right-hand diffuser plate 2 and has no effect on the image. This lighting method has the following problems: 1. when the surface of the measured target is smooth, specular reflection light is easy to generate, and the defect information is easy to be covered by the specular reflection light; 2. the light emitted by the light source has poor parallelism, so that the difficulty of defect identification is increased; 3. the stray light of the light source is not completely absorbed, and the imaging precision is influenced; 4. the light source has single color, and the contrast of defect information is not obvious enough; therefore, the existing lighting device cannot be applied to the surface defect detection of the object.
SUMMERY OF THE UTILITY MODEL
At least one defect or improvement demand to prior art, the utility model provides a polarization uniform parallel light produces device and automatic optical detection system, its aim at solve the problem that can't effectively restrain specular reflection light, defect detection precision are low that current light source produces the device existence.
To achieve the above object, according to one aspect of the present invention, there is provided a polarized uniform parallel light generating device, comprising a light source, a beam uniform and parallel assembly, a first polarizer, a semi-transmissive and semi-reflective mirror, and a second polarizer;
the light beam uniform and parallel assembly, the first polarizer and the semi-transparent and semi-reflective mirror are sequentially arranged on a light path of a light source emergent light beam, and the second polarizer is positioned on one side of the semi-transparent and semi-reflective mirror, which is far away from the first polarizer, and is vertically arranged with the first polarizer;
the light beam uniformity and parallelism component processes the light source emergent light beam to form parallel light with uniform illumination; the parallel light penetrates through the first polarizer to form linearly polarized light, and the linearly polarized light which is emitted to the semi-transparent semi-reflecting mirror is reflected and vertically irradiated on the surface of an article to be measured;
the linearly polarized light generates scattered light with changed polarization state after acting with the surface defects of the object to be detected and generates specular reflection light with unchanged polarization state after acting with the surface of the object to be detected; the scattered light and the specular reflection light are transmitted to a second polarizer after passing through the half-transmitting half-reflecting mirror, and the polarization direction of the second polarizer is configured to be 90 degrees with the first polarizer so as to filter the specular reflection light and allow the scattered light to pass through.
Preferably, in the polarized uniform parallel light generating device, an included angle between the half-transmitting and half-reflecting mirror and the first polarizer and an included angle between the half-transmitting and half-reflecting mirror and the second polarizer are 45 °.
Preferably, in the polarization-uniform parallel light generating device, the light beam uniformity and parallelism component includes a light source collecting lens, a first fresnel lens and a second fresnel lens, which are sequentially disposed on a light path of the light source outgoing light beam;
the light source collecting lens converges light source emergent light beams and then emits the light beams to the first Fresnel lens, uniform light is obtained through the first Fresnel lens, and the uniform light is processed through the second Fresnel lens to obtain parallel light with uniform illumination intensity.
Preferably, in the polarization-uniform parallel light generating device, the light source includes at least two color light emitters, and the color of the light beam output by the light source is adjusted by controlling the on/off and/or the operating current of the light emitters of different colors.
Preferably, the polarization uniform parallel light generating device further comprises a convex-shaped housing, and the light source, the light beam uniform and parallel component, the first polarizer and the half-transmitting and half-reflecting mirror are arranged inside the housing to form a first transmission channel for the light beam emitted by the light source; the second polarizer is arranged on one end face of the shell, and forms a second transmission channel of scattered light and specular reflection light together with the semi-transparent and semi-reflective mirror, and the second transmission channel is vertical to the first transmission channel.
Preferably, in the polarization-uniform parallel light generating device, the inner surface of the housing has a saw-tooth structure and is coated with a black layer to absorb stray light.
Preferably, the polarized uniform parallel light generating device further comprises a colorless transparent cover plate, and the cover plate is arranged on the other end face of the housing, which is opposite to the second polarizer.
Preferably, in the polarized uniform parallel light generating device, the first polarizer and the second polarizer are installed in the housing in a pluggable manner.
Preferably, the polarization uniform parallel light generating device further comprises a heat dissipation mechanism, wherein the heat dissipation mechanism is arranged on one side of the non-light-emitting surface of the light source and is used for absorbing and releasing heat generated by the light source in the working process.
Preferably, in the polarized uniform parallel light generating device, the first and second polarizers may be polarizers, nicols, glans prisms or wollaston prisms.
According to another aspect of the present invention, there is provided an automatic optical inspection system, which includes any one of the above-mentioned polarization uniform parallel light generating devices, and further includes an image collector; the image collector is arranged above the second polarizer and is used for imaging by capturing scattered light emitted from the second polarizer.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
(1) the utility model provides a polarization uniform parallel light generating device, a first polarizer and a second polarizer are respectively arranged at two sides of a semi-transparent semi-reflecting mirror and are vertically arranged, and the polarization angle of the first polarizer and the polarization angle of the second polarizer are different by 90 degrees; the first polarizer, the semi-transparent and semi-reflective mirror and the second polarizer form a transmission channel of light source emergent light beams (linearly polarized light), and the second polarizer and the semi-transparent and semi-reflective mirror form a transmission channel of specular reflection light and scattered light; the mirror reflection light with unchanged polarization state is prevented from being emitted through the unique structural design, but the scattered light with changed polarization state and used for representing defect information is allowed to pass, the mirror reflection light with larger influence on defect detection is effectively filtered, and normal defect imaging is not influenced, so that the sensitivity and the resolution capability of the camera on the defect information are improved.
(2) The utility model provides an even parallel light of polarization produces device uses two fresnel lens, and the light that the light source sent carries out even light sum wavefront control by two fresnel lens respectively behind the collection lens to obtain intensity evenly distributed's parallel light, make measurement accuracy's promotion.
(3) The utility model provides a polarization uniform parallel light generating device, the light source adopts RGB three-color LED module or RGB three-color laser module, can selectively output the light of different colors; the hardware has the characteristics of simple structure, strong stability, smaller volume, lower cost, wide application range and the like.
Drawings
Fig. 1 is a schematic structural diagram of a lighting device commonly used in the prior art according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a polarization uniform parallel light generating device according to an embodiment of the present invention;
in all the figures, the same reference numerals denote the same features, in particular: 1-a light source; 2-a diffuser plate; a 3-spectroscope; 4-a light absorption plate; 5-dust-proof sheet; 6-a radiator; 7-a first polarizer; 8-a half-transmitting and half-reflecting mirror; 9-a second polarizer; 10-a light source collecting lens; 11-a first fresnel lens; 12-a second fresnel lens; 13-a housing; 14-a cover plate; 15-the item to be tested.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Fig. 2 is a schematic structural diagram of a polarization uniform parallel light generating device provided in this embodiment, and referring to fig. 2, the device includes a light source 1, a light beam uniform and parallel component, a first polarizer 7, a half-transmitting and half-reflecting mirror 8, and a second polarizer 9;
the light beam uniform and parallel component, the first polarizer 7 and the semi-transparent and semi-reflective mirror 8 are sequentially arranged on a light path of a light beam emitted by the light source, and the second polarizer 9 is positioned on one side of the semi-transparent and semi-reflective mirror 8 far away from the first polarizer 7 and is arranged perpendicular to the first polarizer 7;
the light beam uniformity and parallelism component processes the light source emergent light beam to form parallel light with uniform illumination; the parallel light forms linearly polarized light after passing through the first polarizer 7, and the linearly polarized light is emitted to the semi-transparent and semi-reflective mirror 8, reflected by the semi-transparent and semi-reflective mirror 8 and vertically irradiated on the surface of the object 15 to be measured;
the linearly polarized light generates scattered light with changed polarization state after acting with the surface defects of the object 15 to be detected, and generates specular reflection light with unchanged polarization state after acting with the surface of the object 15 to be detected; the scattered light and the specular light pass through the half mirror 8 and are directed to a second polarizer 9, the polarization direction of the second polarizer 9 being arranged at 90 ° to the first polarizer 7 for filtering the specular light and allowing the scattered light to pass through.
In this embodiment, the linearly polarized light generated by the first polarizer 7 is reflected by the half mirror 8 and then vertically emitted to the surface of the object to be measured, if the surface of the object to be measured is relatively smooth, the specularly reflected light is easily generated, the polarization state of the specularly reflected light is not changed, and the polarization states of the specularly reflected light and the linearly polarized light generated by the first polarizer 7 are the same as each other, so that the specularly reflected light cannot pass through the second polarizer whose polarization direction is configured to be 90 ° from the first polarizer 7, and is completely filtered by the second polarizer. On the other hand, if the surface of the article to be measured has a defect, the linearly polarized light is scattered after being emitted to the surface defect to generate scattered light, the polarization state of the scattered light is changed relative to the linearly polarized light generated by the first polarizer 7, and the scattered light is not pure linearly polarized light any more, so that after being emitted to the second polarizer, part of the scattered light can be smoothly emitted through the second polarizer and is captured by the camera to be imaged, and a defect image of the article to be measured is obtained.
In the embodiment, the first polarizer 7 and the second polarizer 9 are respectively arranged at two sides of the half-transmitting and half-reflecting mirror 8 and are vertically arranged, and the polarization angle of the first polarizer 7 and the second polarizer 9 is different by 90 degrees; the first polarizer 7, the half-transmitting and half-reflecting mirror 8 and the second polarizer 9 form a transmission channel of light source outgoing beams (linearly polarized light), and the second polarizer 9 and the half-transmitting and half-reflecting mirror 8 form a transmission channel of specular reflection light and scattered light; the mirror reflection light with unchanged polarization state is prevented from being emitted through the unique structural design, but the scattered light with changed polarization state and used for representing defect information is allowed to pass, the mirror reflection light with larger influence on defect detection is effectively filtered, and normal defect imaging is not influenced, so that the sensitivity and the resolution capability of the camera on the defect information are improved.
In this embodiment, the included angle between the half-mirror 8 and the first and second polarizers 7 and 9 is preferably set to 45 °, so as to ensure that the generated specular reflection light can vertically irradiate to the second polarizer 9, thereby improving the filtering effect, and enabling the generated scattered light to enter the transmission channel formed by the second polarizer 9 and the half-mirror 8 as much as possible, thereby improving the imaging quality.
In this embodiment, the light beam homogenizing and parallel component includes a light source collecting lens 10, a first fresnel lens 11 and a second fresnel lens 12, which are sequentially arranged on a light path of a light source emergent light beam;
light generated by the light source 1 is firstly condensed by the light source collecting lens 10, the condensed emergent light beam is emitted to the first Fresnel lens 11, uniform light is obtained by the first Fresnel lens 11, and the uniform light is processed by the second Fresnel lens 12 to obtain parallel light with uniform illumination intensity.
The light source 1 comprises at least two color luminous bodies, and the color of the light beam output by the light source is adjusted by controlling the on/off and/or working current of the luminous bodies with different colors; in this embodiment, the light source 1 is an RGB three-color LED module or an RGB three-color laser module, and the RGB three-color LED module is taken as an example for explanation, and the operating power of each color LED in the LED module is individually adjustable. The control of the generation of three different colored output lights is described below: (1) red LEDs in the RGB three-color LED module are controlled to work, and LEDs of the other two colors are turned off, so that red light output can be realized; (2) the red, green and blue LEDs in the RGB three-color LED module are controlled to work simultaneously, and white light output can be realized by controlling the working current of each LED; (3) and controlling the red LED and the green LED in the RGB three-color LED module to work simultaneously, turning off the blue LED, controlling the working current of the red LED and the green LED, and realizing yellow light output.
Some defects of the object 15 to be detected are colored, the defects are more prominent under the illumination of light with specific color, and the contrast of the defects after imaging is higher, so that the observation and detection are convenient; in addition, the response efficiency of the same camera to light with different colors is inconsistent, and the color of the light output by the light source is selected according to the spectral response curve of the camera, so that the resolution of the image shot by the camera can be improved, and the defect detection precision can be improved. The scheme adjusts the color of the output structured light by changing the working state of the light source 1, so that light with different colors can be selectively output according to requirements.
Further, the polarization uniform parallel light generating device provided by this embodiment further includes a housing 13 in a shape of a "convex", and the light source 1, the light beam uniform and parallel component, the first polarizer 7 and the half-mirror 8 are disposed inside a cavity of the housing 13 to form a first transmission channel for the light beam emitted from the light source; the second polarizer 9 is disposed on one end face of the housing 13, and forms a second transmission channel of the scattered light and the specular reflection light with the half mirror 8, the second transmission channel being perpendicular to the first transmission channel. As a preferred scheme, the inner surface of the housing 13 adopts a sawtooth structure and is coated with a black layer, which is beneficial to absorbing stray light and improving the quality of output light beams.
Referring to fig. 2, the polarization uniform parallel light generating device provided in this embodiment further includes a colorless transparent cover plate 14, where the cover plate 14 is disposed on another end surface of the housing 13 opposite to the second polarizer 9, and encloses with the second polarizer 9 to form a closed space in the housing 13, and mainly plays roles of dust prevention, moisture prevention, and scratch prevention.
In addition, in order to dissipate heat of the light source 1 in operation, the present embodiment is further provided with a heat sink 6, and the heat sink 6 is arranged on one side of the non-light-emitting surface of the light source 1 and used for absorbing and releasing heat generated by the light source in operation.
In this embodiment, the first polarizer 7 and the second polarizer 9 are both mounted on the housing 13 in a pluggable manner, and whether to mount the first polarizer 7 and the second polarizer 9 is determined according to whether the detection environment/object needs to suppress specular reflection light. The first polarizer 7 and the second polarizer 9 may be any one of a polarizing plate, a nicols prism, a glans prism, and a wollaston prism.
The embodiment also provides an automatic optical detection system, which comprises the polarization uniform parallel light generating device and a camera; referring to fig. 1, the camera is arranged above the second polarizer 9, and obtains an image to be detected by capturing scattered light emitted from the second polarizer 9 for imaging; further, the automatic optical detection system also comprises an image processor, wherein the image processor acquires an image to be detected acquired by the camera and performs image processing, and acquires information such as the size, position, direction, spectral characteristics, structure, defects and the like of a target from the image to be detected, so that a basis is provided for subsequent product inspection and quality judgment.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A polarized uniform parallel light generating device is characterized by comprising a light source, a light beam uniform and parallel component, a first polarizer, a semi-transmitting and semi-reflecting mirror and a second polarizer;
the light beam uniform and parallel assembly, the first polarizer and the semi-transparent and semi-reflective mirror are sequentially arranged on a light path of a light source emergent light beam, and the second polarizer is positioned on one side of the semi-transparent and semi-reflective mirror, which is far away from the first polarizer, and is vertically arranged with the first polarizer;
the light beam uniformity and parallelism component processes the light source emergent light beam to form parallel light with uniform illumination; the parallel light penetrates through the first polarizer to form linearly polarized light, and the linearly polarized light which is emitted to the semi-transparent semi-reflecting mirror is reflected and vertically irradiated on the surface of an article to be measured;
the linearly polarized light generates scattered light with changed polarization state after acting with the surface defects of the object to be detected and generates specular reflection light with unchanged polarization state after acting with the surface of the object to be detected; the scattered light and the specular reflection light are transmitted to a second polarizer after passing through the half-transmitting half-reflecting mirror, and the polarization direction of the second polarizer is configured to be 90 degrees with the first polarizer so as to filter the specular reflection light and allow the scattered light to pass through.
2. The polarized uniform parallel light generating device according to claim 1, wherein the angle between the half-mirror and the first polarizer and the angle between the half-mirror and the second polarizer are 45 °.
3. The apparatus according to claim 1, wherein the beam homogenizing and parallelizing assembly comprises a light source collecting lens, a first fresnel lens and a second fresnel lens disposed in sequence on the optical path of the light source exit beam;
the light source collecting lens converges light source emergent light beams and then emits the light beams to the first Fresnel lens, uniform light is obtained through the first Fresnel lens, and the uniform light is processed through the second Fresnel lens to obtain parallel light with uniform illumination intensity.
4. The polarization-uniform parallel light generating apparatus according to claim 1, wherein the light source comprises at least two color emitters, and the color of the light beam outputted from the light source is adjusted by controlling the on/off and/or the operating current of the different color emitters.
5. The device for generating polarized uniform parallel light as claimed in claim 1, further comprising a housing in a shape of "convex", wherein the light source, the light beam uniform and parallel assembly, the first polarizer and the half-mirror are disposed inside the housing to form a first transmission channel for the light beam emitted from the light source; the second polarizer is arranged on one end face of the shell, and forms a second transmission channel of scattered light and specular reflection light together with the semi-transparent and semi-reflective mirror, and the second transmission channel is vertical to the first transmission channel.
6. The polarization uniform parallel light generating apparatus of claim 5, wherein the inner surface of said housing is saw-toothed and coated with a black layer for absorbing stray light.
7. The polarized uniform parallel light generating apparatus according to claim 5, further comprising a colorless transparent cover plate provided on the other end face of the housing opposite to the second polarizer.
8. The polarized uniform parallel light generating apparatus of claim 5, wherein the first and second polarizers are mounted in a pluggable manner inside the housing.
9. The apparatus according to claim 1, further comprising a heat sink mechanism disposed on a side of the non-light-emitting surface of the light source for absorbing and releasing heat generated by the light source during operation.
10. An automatic optical detection system, which is characterized by comprising the polarization uniform parallel light generating device of any one of claims 1 to 9, and further comprising an image collector; the image collector is arranged above the second polarizer and is used for imaging by capturing scattered light emitted from the second polarizer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113655063A (en) * | 2021-08-09 | 2021-11-16 | 天津城建大学 | Detection apparatus for combined material finished product spare hole quality |
| CN115619715A (en) * | 2022-09-16 | 2023-01-17 | 苏州斯普兰蒂科技股份有限公司 | Detection method of silk-screen printing product based on artificial intelligence |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113655063A (en) * | 2021-08-09 | 2021-11-16 | 天津城建大学 | Detection apparatus for combined material finished product spare hole quality |
| CN115619715A (en) * | 2022-09-16 | 2023-01-17 | 苏州斯普兰蒂科技股份有限公司 | Detection method of silk-screen printing product based on artificial intelligence |
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