CN210965959U - Optical detection device and color sorter - Google Patents
Optical detection device and color sorter Download PDFInfo
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- CN210965959U CN210965959U CN201921898814.6U CN201921898814U CN210965959U CN 210965959 U CN210965959 U CN 210965959U CN 201921898814 U CN201921898814 U CN 201921898814U CN 210965959 U CN210965959 U CN 210965959U
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Abstract
The utility model provides an optical detection device and look selection machine belongs to material sorting technical field. An optical inspection device comprising: the light source, the scanning mirror, the optical element and the light receiving assembly, a light beam emitted by the light source irradiates the material to be detected through the scanning mirror, the scanning mirror receives the light beam emitted by diffuse reflection on the surface of the material to be detected and emits the light beam to an inlet of the light receiving assembly through the optical element, and the diameter of an effective area of the optical element is smaller than or equal to the caliber of the inlet of the light receiving assembly. A color sorter comprises the optical detection device. The utility model discloses can reduce the stray light that the spectrum appearance received the lamp cup and jetted out, improve the spectrum appearance and receive the degree of accuracy of signal-to-noise ratio and material spectrum that waits to detect material diffuse reflection signal.
Description
Technical Field
The utility model relates to a technical field is selected separately to the material, particularly, relates to an optical detection device and look selection machine.
Background
With the great application of color sorters in the grain and oil industry, the color sorter industry in China develops more and more mature, the variety specifications are more and more, the sorting application range is wider and wider from the initial sorting of rice and coarse cereals to the current plastic sorting, and from the chromaticity, color difference and shape sorting to the current spectrum sorting.
In the plastic sorting industry, the types of plastics are hundreds of thousands, most of plastics are grey white or semitransparent, the traditional color sorting is difficult to apply to the plastic sorting due to similar colors, and the plastic spectra of different types are obviously different through research and analysis on the plastic spectra, so that the sorting of the plastics can be completed by identifying the plastic spectra. The method that uses the spectrum appearance to detect the material spectrum at present commonly used is, receive the diffuse reflection light that carries material spectrum information through fiber probe, the diameter of general optic fibre is all at sub millimeter magnitude, and numerical aperture is generally between 0 ~ 1, detection range is comparatively narrow and small, it surveys to be difficult to satisfy the material of whole conveyer belt width, the solution of present mainstream is through placing multiaspect rotation scanning mirror at the optic fibre front end, the scanning mirror is in rotatory in-process, through the specular reflection, optic fibre can receive the scanning mirror and sweep the interior material diffuse reflection light of region, and then transmit the spectrum appearance, realize the material discernment to the material, and then accomplish the separation.
In the existing imaging system, a lamp cup and an optical fiber probe are horizontally arranged, a light source illuminates a reflecting surface of a scanning mirror after being lightened, the light source reflects to the surface of an object, and diffuse reflection information of the object reaches the optical fiber probe through the reflecting surface of the scanning mirror.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an optical detection device and look selection machine can reduce the stray light that the spectrum appearance received the lamp cup and jetted out, improves the spectrum appearance and receives the signal to noise ratio of waiting to detect material diffuse reflection signal and the degree of accuracy of material spectrum.
The embodiment of the utility model is realized like this:
an aspect of the embodiment of the utility model provides an optical detection device, include: the light source, the scanning mirror, the optical element and the light receiving assembly, a light beam emitted by the light source irradiates the material to be detected through the scanning mirror, the scanning mirror receives the light beam emitted by diffuse reflection on the surface of the material to be detected and emits the light beam to an inlet of the light receiving assembly through the optical element, and the diameter of an effective area of the optical element is smaller than or equal to the caliber of the inlet of the light receiving assembly.
Optionally, the optical element is a reflective mirror, an entrance of the light receiving assembly faces a direction perpendicular to a light outgoing direction of the light source, and the reflective mirror and the light outgoing direction of the light source are arranged at an included angle of 45 degrees, so as to reflect a diffuse reflection light beam emitted by the scanning mirror to the entrance of the light receiving assembly.
Optionally, the optical element is a diaphragm, an entrance of the light receiving assembly faces in parallel with a light outgoing direction of the light source, and the diffuse reflection signal emitted from the scanning mirror is emitted to the entrance of the light receiving assembly through the diaphragm.
Optionally, the light source is an infrared light source or a visible light source or an ultraviolet light source.
Optionally, a cup cover is arranged on the light source, and a reflective film layer is arranged on the inner surface of the cup cover.
Optionally, the light receiving assembly includes an optical fiber and a spectrometer connected to an outlet of the optical fiber, an inlet of the optical fiber is connected to the probe, the probe is configured to receive a diffuse reflection signal of the material to be detected, and the spectrometer is configured to perform spectral analysis on the received diffuse reflection signal.
Optionally, the scanning mirror is a polygon mirror, a mirror shaft penetrates through the center of the polygon mirror, and the mirror shaft rotates to enable a plurality of reflecting surfaces of the polygon mirror to sequentially receive the emergent light beams of the light source and reflect the emergent light beams to the material to be detected.
Optionally, the polygon mirror includes N reflecting surfaces, where N is greater than or equal to 3 and N is a positive integer.
Optionally, the optical detection device further includes a driver in transmission connection with the mirror shaft, and the driver is configured to drive the mirror shaft to rotate at a uniform speed.
The utility model discloses another aspect of the embodiment provides a color sorter, include: a plurality of above-mentioned optical detection device of any one still includes conveyer, and the material that awaits measuring passes through transmission and conveys, and optical detection device detects the material that awaits measuring of conveying.
The utility model discloses beneficial effect includes:
the embodiment of the utility model provides an optical detection device, this optical detection device comprises the light source, the scanning mirror, optical element and light receiving component, the light beam of light source outgoing shines through the scanning mirror and detects the material, the light source provides illumination for detecting the material, be convenient for detect the material and carry out diffuse reflection, the scanning mirror receives the light beam of detecting the material surface diffuse reflection outgoing and through optical element outgoing to the entry of light receiving component, the diffuse reflection light of detecting the material is through scanning mirror reflection to optical element and filter, the diameter of optical element's effective area is less than or equal to the bore of light receiving component's entry, the diffuse reflection light of detecting the material that the scanning mirror reflected realizes through the method of reflecting the light beam to be less than or equal to light receiving component bore, therefore, stray light emitted by the spectrometer receiving light source can be reduced, and the signal to noise ratio of signals received by the spectrometer is improved.
The embodiment of the utility model provides a look selection machine adopts foretell optical detection device, can improve the degree of accuracy of spectrum appearance received material spectrum, realizes the accurate discernment to the material.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an optical detection apparatus according to an embodiment of the present invention;
fig. 2 is a front view of an optical detection apparatus provided in an embodiment of the present invention;
fig. 3 is a left side view of the optical detection apparatus provided in the embodiment of the present invention.
Icon: 1-a scanning mirror; 2-a probe; 3-a reflector; 4-a first light source; 5-a second light source; 6-an optical fiber; 7-a spectrometer; 8-mirror axis; 9-detecting the material to be detected; 10-a conveyor belt; 11-a transfer roller; 12-transport roller shaft.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is also to be understood that the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically indicated and limited.
Fig. 1 is a schematic structural diagram of an optical detection apparatus provided by the present invention, please refer to fig. 1, an embodiment of the present invention provides an optical detection apparatus, including: the scanning device comprises a light source, a scanning mirror 1, an optical element and a light receiving component, wherein light beams emitted by the light source irradiate a material 9 to be detected through the scanning mirror 1, the scanning mirror 1 receives the light beams emitted by diffuse reflection on the surface of the material 9 to be detected and emits the light beams to an inlet of the light receiving component through the optical element, and the diameter of an effective area of the optical element is smaller than or equal to the caliber of the inlet of the light receiving component.
It should be noted that, firstly, the light source includes a first light source 4 and a second light source 5, light beams emitted by the first light source 4 and the second light source 5 are parallel, and the first light source 4 and the second light source 5 are arranged in the same direction, the scanning mirror 1 mainly has two functions, on one hand, the scanning mirror 1 receives irradiation light emitted by the first light source 4 and the second light source 5 and reflects the irradiation light to the material 9 to be detected, on the other hand, the scanning mirror 1 receives diffuse reflection light information of the material 9 to be detected and reflects the diffuse reflection light information to an optical element, the optical element is used for filtering the light beam of the material 9 to be detected reflected by the scanning mirror 1, the diffuse reflection light information is received by the light receiving component after being filtered by the optical element, the diffuse reflection light beam after filtering is less in invalid light, and the invalid light indicates that the diffuse reflection light reflected by the scanning mirror 1 is not the diffuse.
Secondly, the first light source 4 and the second light source 5 emit irradiation light to the scanning mirror 1, the scanning mirror 1 reflects the received irradiation light to the material 9 to be detected, after the material 9 to be detected receives the reflected light, the material 9 to be detected starts diffuse reflection, the material 9 to be detected emits diffuse reflection light to the scanning mirror 1, the scanning mirror 1 reflects the received diffuse reflection light information to the optical element, the diffuse reflection light is received by the light receiving component after being filtered by the optical element, the light receiving component analyzes the diffuse reflection light information according to the received diffuse reflection light information, and then the material of the material is identified.
The embodiment of the utility model provides an optical detection device, this optical detection device is by the light source, scanning mirror 1, optical element and light receiving component constitute, the light beam of light source outgoing shines through scanning mirror 1 and detects material 9, the light source provides illumination for detecting material 9, be convenient for detect material 9 and carry out diffuse reflection, scanning mirror 1 receives the light beam of detecting material 9 surface diffuse reflection outgoing and passes through optical element and go out to the entry of light receiving component, the diffuse reflection light of detecting material 9 is reflected to optical element through scanning mirror 1 and is filtered, the diameter of optical element's effective area is less than or equal to the bore of light receiving component's entry, the diffuse reflection light of detecting material 9 that scanning mirror 1 reflected is realized through the method of reflecting the light beam to be less than or equal to light receiving component bore, thereby can reduce the stray light that light receiving component received the light source and jetted out, and the signal-to-noise ratio of the diffuse reflection signal of the material to be detected 9 received by the light receiving component is improved.
Fig. 2 is a front view of the optical detection apparatus provided in the embodiment of the present invention, please refer to fig. 2, in this embodiment, the optical element is a reflective mirror 3, the entrance orientation of the light receiving component is perpendicular to the light emitting direction of the light source, the reflective mirror 3 and the light emitting direction of the light source are arranged at an included angle of 45 degrees, so as to reflect the diffuse reflection beam emitted from the scanning mirror 1 to the entrance of the light receiving component.
It should be noted that, the inlet of the light receiving component faces to the direction perpendicular to the light emitting direction of the light source, so that the influence of the heat generated by the light source on the diameter of the optical fiber glass core in the light receiving component is effectively reduced, and the accuracy of the light receiving component for receiving the spectrum of the material to be detected 9 is improved; the reflector 3 is arranged at an included angle of 45 degrees with the light emitting direction of the light source, the reflector 3 can accurately reflect diffuse reflection light information of the material 9 to be detected reflected by the scanning mirror 1 to the light receiving assembly, and according to the light emission principle, the included angle formed by incident light and emergent light is 90 degrees, so that the reflector 3 is arranged at an included angle of 45 degrees with the light emitting direction of the light source.
In this embodiment, the optical element is a diaphragm (not labeled in the figure), the entrance of the light receiving assembly faces in parallel with the light emitting direction of the light source, and the diffuse reflection signal emitted from the scanning mirror 1 is emitted to the entrance of the light receiving assembly through the diaphragm.
It should be noted that the diaphragm is another scheme of the optical element, and the diaphragm is used as the optical element in this embodiment, in this scheme, the diffuse reflection light of the material 9 to be detected is reflected by the scanning mirror 1, and in the process that the information of the diffuse reflection light enters the light receiving assembly through filtering by the optical element, the light path of the diffuse reflection light is not changed, that is, the light path of the diffuse reflection light emitted by the scanning mirror 1 and the light path of the diffuse reflection light received by the light receiving assembly are not changed. The light receiving component receives the light beam and is parallel to the light beam emitted by the light source, the two light beams are in the same plane, and the diaphragm is arranged between the light receiving component and the light source.
In this embodiment, the light source is an infrared light source, a visible light source, or an ultraviolet light source.
It should be noted that, for example, if the material 9 to be detected is made of plastic, the light source is an infrared light source or a visible light source, where the infrared light source is invisible light and can provide high-contrast image inspection when the material 9 to be detected is difficult to inspect in a visible light range; the visible light source is the portion of the electromagnetic spectrum that is perceivable by the human eye and the visible spectrum has no precise range. For example, if the material 9 to be detected is moldy corn or the like, the light source may be replaced by an ultraviolet light source, and the ultraviolet light source may excite the moldy material to emit fluorescence.
In this embodiment, a cup cover is disposed on the light source, and a reflective film layer is disposed on an inner surface of the cup cover.
It should be noted that, the first light source 4 and the second light source 5 are both provided with a cup cover, a reflective film layer is arranged on the surface of the cup cover, so as to gather the light sources and improve the light utilization rate of the light sources, and the reflective film layer is plated on the inner surface of the cup cover and reflects the light of the corresponding wave band according to the selected wave band of the light sources.
In this embodiment, the light receiving component includes an optical fiber 6 and a spectrometer 7 connected to an outlet of the optical fiber 6, an inlet of the optical fiber 6 is connected to the probe 2, the probe 2 is configured to receive a diffuse reflection signal of a material 9 to be detected, and the spectrometer 7 is configured to perform spectrum analysis on the received diffuse reflection signal.
It should be noted that the diameter of the probe 2 is larger than the diameter of the optical fiber 6, so as to transmit the received light beams to the optical fiber 6, the diameter of the light spot emitted from the probe 2 to the upper surface of the reflective mirror 3 is larger than or equal to the effective area of the reflective mirror 3, mainly for receiving the information of the diffuse reflection light filtered by the reflective mirror 3, and the effective area of the reflective mirror 3 is the area for receiving the diffuse reflection light beam of the material 9 to be detected. The optical fiber 6 is used for connecting the probe 2 and the spectrometer 7, and the spectrometer 7 can collect specific spectra of objects through grating light splitting, so that the color or material identification of the material 9 to be detected is realized.
In this embodiment, the scanning mirror 1 is a polygon mirror, a mirror shaft 8 penetrates through the center of the polygon mirror, and the mirror shaft 8 rotates to enable a plurality of reflecting surfaces of the polygon mirror to sequentially receive outgoing light beams of the light source and reflect the outgoing light beams to the material 9 to be detected.
It should be noted that, in the sorting process of the materials 9 to be detected, the scanning mirror 1 is driven by the mirror shaft 8 to rotate at a certain speed, the scanning mirror 1 rotates for one turn, the probe 2 receives signals of the materials 9 to be detected for multiple times, and diffuse reflection signals of the materials 9 to be detected are sequentially received by the probe 2, so that the spectrometer 7 scans the materials 9 to be detected.
In this embodiment, the polygon mirror includes N reflecting surfaces, where N is greater than or equal to 3 and is a positive integer.
It should be noted that the number of the reflecting surfaces of the polygon mirror is set according to the rotating speed and the width of the reflecting surfaces of the polygon mirror and the conveying speed of the material 9 to be detected, wherein the conveying of the material 9 to be detected is completed by the conveyor belt 10, and since the material 9 to be detected is moving, the detection of the material 9 to be detected by the polygon mirror in the rotating process depends on the speed of the conveyor belt 10 conveying the material 9 to be detected, the rotating speed of the polygon mirror and other conditions, and therefore, a person skilled in the art should design the number of the reflecting surfaces in the polygon mirror according to specific conditions.
In this embodiment, the optical detection device further includes a driver in transmission connection with the mirror shaft 8, and the driver is configured to drive the mirror shaft 8 to rotate at a constant speed.
It should be noted that, the scanning mirror 1 is always in a state of rotating at a certain speed, so that the scanning mirror 1 needs to be powered, the driver is used for powering the rotation of the scanning mirror 1, and the driver can be in various forms, such as electric driving, hydraulic driving, electric driving, etc., as long as the driving for powering the rotation of the scanning mirror 1 can be realized.
The utility model provides an optical detection device, through increasing optical element, improve the SNR that improves spectrum appearance 7 received signal, wherein, in this embodiment, optical element has given two kinds of technical scheme, one kind is the reflector 3 that changes the route of scanning mirror 1 reverberation, another kind is the diaphragm that does not change the route of scanning mirror 1 reverberation, two kinds of schemes can all realize reducing the stray light that spectrum appearance 7 received the light source and jet out, improve spectrum appearance 7 received signal's SNR, and can reduce the heat that the light source produced and to the influence of optical fiber glass core footpath in the light receiving component, improve spectrum appearance 7 and receive the degree of accuracy of waiting to detect 9 diffuse reflection light of material.
The utility model discloses another aspect of the embodiment provides a color sorter, include: a plurality of above-mentioned optical detection device of any item still includes conveyer, and the material 9 that awaits measuring conveys through transmission, and optical detection device detects the material 9 that awaits measuring that conveys.
Please refer to fig. 3, the conveying device includes a conveying belt 10, a conveying roller 11 and a conveying roller shaft 12, the conveying roller shaft 12 drives the conveying roller 11 to rotate, the conveying roller 11 drives the conveying belt 10 to convey, and the conveying belt 10 drives the material 9 to be detected to advance. Illustratively, in the normal sorting process of the materials 9 to be detected, the scanning mirror 1 rotates at a specific speed, the conveyor belt 10 also moves at a certain speed, the scanning mirror 1 rotates for a circle, the probe 2 receives all the spectral signals of the materials 9 to be detected in the width direction of the conveyor belt 10 for eight times, and along with the movement of the conveyor belt 10, the diffuse reflection signals of the materials 9 to be detected in the length direction of the conveyor belt 10 are sequentially received by the probe 2, so that the materials on the whole conveyor belt 10 are scanned by the spectrometer 7.
The utility model discloses on the other hand provides a look selection machine, changes look selection machine and can realize treating the accurate detection or the discernment that detect material 9.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An optical inspection apparatus, comprising: the scanning mirror receives the light beam emitted by the diffuse reflection of the surface of the material to be detected and emits the light beam to the inlet of the light receiving component through the optical element, and the diameter of the effective area of the optical element is smaller than or equal to the caliber of the inlet of the light receiving component.
2. The optical inspection device according to claim 1, wherein the optical element is a reflective mirror, the entrance of the light receiving element is oriented perpendicular to the light emitting direction of the light source, and the reflective mirror is disposed at an angle of 45 ° with respect to the light emitting direction of the light source, so as to reflect the diffuse reflected light beam emitted from the scanning mirror to the entrance of the light receiving element.
3. The optical inspection device as claimed in claim 1, wherein the optical element is an aperture, the entrance of the light receiving module is oriented parallel to the light emitting direction of the light source, and the diffuse reflection signal emitted from the scanning mirror exits to the entrance of the light receiving module through the aperture.
4. The optical inspection device of claim 1 wherein the light source is an infrared light source or a visible light source or an ultraviolet light source.
5. The optical inspection device of claim 1 wherein the light source is provided with a cup, the cup having a reflective film layer on an inner surface thereof.
6. The optical inspection device of claim 1 wherein the light receiving assembly comprises an optical fiber and a spectrometer connected to an outlet of the optical fiber, an inlet of the optical fiber is connected to a probe for receiving the diffuse reflection signal of the material to be inspected, and the spectrometer is configured to perform spectral analysis on the received diffuse reflection signal.
7. The optical inspection device of claim 1, wherein the scanning mirror is a polygon mirror, a mirror shaft is disposed through a center of the polygon mirror, and the mirror shaft rotates to enable a plurality of reflecting surfaces of the polygon mirror to sequentially receive the outgoing light beams of the light source and reflect the outgoing light beams to the material to be inspected.
8. The optical inspection device of claim 7 wherein the polygon mirror includes N reflective surfaces, wherein N is greater than or equal to 3 and N is a positive integer.
9. The optical inspection device of claim 7, wherein the scanning mirror further comprises a driver drivingly connected to the mirror shaft, the driver configured to drive the mirror shaft to rotate at a constant speed.
10. A color sorter comprising an optical inspection device according to any one of claims 1 to 9, and further comprising a conveyor through which material to be inspected is conveyed, said optical inspection device inspecting said conveyed material to be inspected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921898814.6U CN210965959U (en) | 2019-11-05 | 2019-11-05 | Optical detection device and color sorter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921898814.6U CN210965959U (en) | 2019-11-05 | 2019-11-05 | Optical detection device and color sorter |
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| CN210965959U true CN210965959U (en) | 2020-07-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809073A (en) * | 2021-02-09 | 2022-07-29 | 北京住总集团有限责任公司 | Intelligent leveling system and method |
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2019
- 2019-11-05 CN CN201921898814.6U patent/CN210965959U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809073A (en) * | 2021-02-09 | 2022-07-29 | 北京住总集团有限责任公司 | Intelligent leveling system and method |
| CN114809073B (en) * | 2021-02-09 | 2024-02-27 | 北京住总集团有限责任公司 | Intelligent leveling system and method |
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Address after: 230000 intersection of Fangxing Avenue and Yulan Avenue, Taohua Industrial Park, Hefei Economic and Technological Development Zone, Anhui Province Patentee after: Hefei Taihe Intelligent Technology Group Co.,Ltd. Address before: 230000 intersection of Fangxing Avenue and Yulan Avenue, Taohua Industrial Park, Hefei Economic and Technological Development Zone, Anhui Province Patentee before: HEFEI TAIHE OPTOELECTRONIC TECHNOLOGY Co.,Ltd. |
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