CN111715560A - Laser interference color sorting device - Google Patents
Laser interference color sorting device Download PDFInfo
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- CN111715560A CN111715560A CN202010603238.9A CN202010603238A CN111715560A CN 111715560 A CN111715560 A CN 111715560A CN 202010603238 A CN202010603238 A CN 202010603238A CN 111715560 A CN111715560 A CN 111715560A
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- laser
- light source
- image sensor
- light
- mirror
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/02—Measures preceding sorting, e.g. arranging articles in a stream orientating
Abstract
The invention relates to a laser interference color sorting device which comprises a feeding mechanism, a color sorting machine body, a material distributing hopper and a control system, wherein the feeding mechanism, the color sorting machine body, the material distributing hopper and the control system are sequentially connected, the color sorting machine body comprises a shell, and an optical system and a spray valve which are arranged in the shell, the optical system comprises a light source, a light path module and an image sensor, the spray valve, the feeding mechanism, the image sensor and the light source are all connected with the control system, and the light source is a laser light source. Compared with the prior art, the laser has good monochromaticity, directivity and high brightness, is easy to generate interference images, has higher stability, has certain penetrability, can detect the defects in the material, does not need to be shaded, and has little influence on the material by ambient light.
Description
Technical Field
The invention relates to a color sorter, in particular to a laser interference color sorter.
Background
The color selector is equipment for automatically sorting out heterochromatic particles in particle materials by utilizing a photoelectric detection technology according to the difference of optical characteristics of the materials. Color sorters are currently used in the field of discrete materials or packaging industries, food quality inspection and classification.
The method has the advantages that the method meets the requirements of color sorters in some industries at present, and the sorting precision of the color sorters is higher. Chinese patent CN111167747A discloses a novel color sorter based on white light michelson interference, which comprises a feeding mechanism, a color sorter body, a separating hopper and a control system, which are connected in sequence. The color sorter body comprises a shell, a first optical system and a spray valve, wherein the first optical system and the spray valve are arranged in the shell, and the color sorter body is characterized in that the first optical system comprises a first image sensor, a first light source, a first lens, a first semi-transparent semi-reflective mirror, a first plane lens and a first plane reflective mirror, which are sequentially arranged, and the feeding mechanism, the first image sensor, the first light source and the spray valve are all connected with a control system. Although there is a higher accuracy, there are the following drawbacks: the influence of natural light is large, the shading performance is good, and the defects in the material cannot be detected.
Disclosure of Invention
The invention aims to provide a laser interference color selection device, which has good monochromaticity, directivity and high brightness based on laser, thereby being easy to generate interference images, having higher stability, having certain penetrability of a laser light source, being capable of detecting the defects in materials, avoiding light and having little influence on the materials by ambient light.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a laser interference look selects device, is including the feed mechanism, look selection machine body and the branch hopper that connect gradually to and control system, look selection machine body includes the casing to and locate optical system and the spout valve in the casing, optical system includes light source, light path module and image sensor, it all is connected with control system to spout valve, feed mechanism, image sensor and light source, the light source is laser light source.
Further, the laser light source is a visible laser light source.
Furthermore, the image sensor is a high-speed linear array color image sensor or a high-speed linear array black-and-white image sensor.
Further, the laser light source is an infrared laser light source.
Further, the image sensor is an infrared image sensor.
Further, the intensity of the laser light source is greater than 10 mW.
Further, the intensity of the laser light source is 20 mW.
Further, the optical path module comprises a laser beam expanding and collimating system, a semi-transparent and semi-reflective mirror, a first plane mirror and a plane mirror,
the light emitted by the laser source is irradiated to the semi-transparent semi-reflecting mirror after being uniformly expanded and collimated by the laser beam expanding and collimating system and is divided into two beams of transmission and reflection light,
the light transmitted by the half-transmitting and half-reflecting mirror irradiates the plane reflecting mirror and then reflects back to the half-transmitting and half-reflecting mirror against the incident direction to generate the second reflection to obtain the reference beam,
the light reflected by the semi-transparent semi-reflecting mirror irradiates the material, and is reflected back to the semi-transparent semi-reflecting mirror through the surface of the material to be transmitted, so as to obtain a measuring beam,
the measuring light beam and the reference light beam interfere after passing through the semi-transparent semi-reflective mirror to generate light and dark interference fringes, the light and dark interference fringes are received by the image sensor and are transmitted to the control system to be subjected to image algorithm analysis, whether the material is good or not is judged, and then the switch of the spray valve is controlled to screen the material.
Further, the half mirror is arranged at an angle of 45 degrees with the incident light, and the transmission and reflection ratio is 50/50.
Furthermore, the optical systems are provided with two optical systems, and the two optical systems are respectively arranged on two sides of the material falling point.
Compared with the prior art, the invention has the following beneficial effects:
1. because laser has good monochromaticity, directionality, hi-lite, produces the interference image easily, and stability is higher, and laser source has certain penetrability, can detect the inside defect of material to need not keep out of the sun, ambient light is little to its influence.
2. The method has good monochromaticity and higher measurement precision, and can be used for detecting composite material structures, honeycomb sandwich structures and the like which cannot be detected before.
3. The laser light source is an infrared laser light source, has stronger anti-jamming capability and has strong identification capability on chemical bonds in substances.
4. The laser light source is a visible laser light source, has high brightness and high color saturation, and can achieve imaging with higher resolution.
5. The laser light source is more than 10mW, and 20mW at this time, and the light source with the intensity can meet the requirement of color selection imaging precision on the premise of low energy consumption as much as possible, and is favorable for heat dissipation of the light source.
Drawings
FIG. 1 is a schematic structural view of the present invention;
wherein: 101. the device comprises a shell, 201, a vibration feeding system, 301, a feeding port, 401, a sliding chute, 501 a laser light source, 503, a collimation and beam expansion system, 505, a half-transmitting and half-reflecting mirror, 507, an image sensor, 509, a plane reflecting mirror, 511, a plane mirror, 513, a white light source, 601, a control system, 701, a spraying valve, 801 and a material distribution hopper.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The optical interference technology refers to a method for generating interference fringes by superposing one light wave reflected, refracted or diffracted by an object and another light wave reflected by the surface of a reference mirror. Laser interferometry is used in many areas for precision measurements such as fiber sensing, micro-profiling, surface profiling lamps, etc.
When the measurement is performed by the laser interference technique, the interference fringes are carriers of measurement information, and information related to the surface structure to be measured included in the fringes can be obtained by analyzing the interference fringes. In laser interferometry, laser light generates interference fringes by the principle of interference, and an interference image is formed and imaged on an image sensor.
The invention combines the laser interference technology and the color sorting technology, can realize the precision measurement and sorting of micron level, greatly improves the sorting precision of the color sorter, can apply the color sorter to wider industrial field, and provides an effective method and a way for the further development of the color sorter.
The utility model provides a laser interference look selection device, is including the feed mechanism, look selection machine body and the branch hopper 801 that connect gradually to and control system 601, and look selection machine body includes casing 101 to and locate optical system and the spout valve 701 in the casing, and optical system includes light source, light path module and image sensor 507, spouts valve 701, feed mechanism, image sensor 507 and the light source all is connected with control system 601, and the light source is laser source.
Because laser has good monochromaticity, directionality, hi-lite, produces the interference image easily, and stability is higher, and laser source has certain penetrability, can detect the inside defect of material to need not keep out of the sun, ambient light is little to its influence.
The laser light source is a visible laser light source, and at this time, the image sensor 507 is a high-speed linear array color image sensor or a high-speed linear array black-and-white image sensor.
The laser light source is an infrared laser light source, and the image sensor 507 is an infrared image sensor.
The intensity of the laser light source is more than 10mW, and the brightness of the laser light source is 20 mW.
The light path module comprises a laser beam expanding collimation system 503, a semi-transparent semi-reflective mirror 505, a first plane mirror 511 and a plane reflective mirror 509, light emitted by a laser source 501 is irradiated to the semi-transparent semi-reflective mirror 505 after being uniformly expanded and collimated by the laser beam expanding collimation system 503, and is divided into two beams of transmission and reflection, the light transmitted by the semi-transparent semi-reflective mirror 505 is irradiated on the plane reflective mirror 509 and then reflected back to the semi-transparent semi-reflective mirror 505 along the incident direction to generate second reflection to obtain a reference beam, the light reflected by the semi-transparent semi-reflective mirror 505 is irradiated on a material and then reflected back to the semi-transparent semi-reflective mirror 505 through the surface of the material to generate transmission to obtain a measuring beam, the measuring beam and the reference beam are interfered after passing through the semi-transparent semi-reflective mirror 505 to generate interference fringes with light and dark intervals, the interference fringes are received by an image sensor 507 and are transmitted to, and then the switch of the spray valve 701 is controlled so as to select the materials. The image sensor 507 is provided above the half mirror 505.
The half mirror 505 is installed at an angle of 45 degrees with respect to the incident light, and has a transmittance and a reflectance of 50/50, and the flat mirror 511 mainly functions to compensate the optical path and has the same thickness as the half mirror 505.
The optical systems are two in number and are respectively arranged on two sides of the material falling point.
Two symmetrical white light sources 513 can be arranged and can directly irradiate the material falling point A to be reflected or projected and then are respectively received by the image sensor 507, and the test result of the image is mutually complemented with the test result of the interference image generated by laser interference, so that the whole color sorting system can achieve a better measurement result.
The feeding mechanism comprises a vibrating feeding system 201, a feeding hole 301 and a sliding groove 401 which are sequentially arranged, the feeding hole 301 is arranged at one end of the sliding groove 401, the other end of the sliding groove 401 is a material falling point A, and the vibrating feeding system 201 is located at the feeding hole 301. The distributing hopper 801 is composed of a finished product tank and a defective product tank.
The optical system further includes an adjusting mechanism for adjusting the distance between the plane mirror 509 and the half mirror 505, and the adjusting mechanism is connected to the control system 601.
The materials enter from the vibration feeding system 201 and reach the chute 401 through the feeding hole 301, and the chute can enable the materials to fall to the light path system at a constant speed. The optical path system of the present invention uses a laser light source as an incident light source, which is converged by the collimation and beam expansion system 503 to irradiate onto the half mirror 505, and is divided into two beams of light with nearly equal transmission and reflection amplitudes. The transmitted light irradiates the plane mirror and is reflected back to the surface of the half-transmitting and half-reflecting mirror 505 against the incident direction, and is reflected again to be reference light beams; the reflected light irradiates the material and is reflected back to the semi-transparent semi-reflective mirror on the surface of the material to be a measuring beam. A plane mirror which is parallel to the semi-transparent semi-reflecting mirror and has the same thickness and refractive index is added between the plane reflecting mirror and the semi-transparent semi-reflecting mirror, and is used for compensating the optical path difference generated by the measurement light beam and the reference light beam due to different times of passing through the semi-transparent semi-reflecting mirror. The measuring beam and the reference beam interfere with each other after passing through the half-transmitting and half-reflecting mirror for the second time to generate interference fringes with alternating light and dark colors, the interference fringes are received by the image sensor 507 and are transmitted to the control system 601 to be subjected to image algorithm analysis, whether the material is good or not is judged, and then the switch of the spray valve 701 is controlled to screen the material. Since the generation of interference fringes depends on the multiple relation between the optical path difference and the wavelength of the reference light and the measuring light, the optical path difference of the reference light and the measuring light can be adjusted by horizontally adjusting the positions of the two plane mirrors, so that the state of the interference fringes is controlled.
Claims (10)
1. The utility model provides a laser interference look selection device, is including the feed mechanism, look selection machine body and the branch hopper (801) that connect gradually to and control system (601), look selection machine body includes casing (101) to and locate optical system and the spout valve (701) in the casing, optical system includes light source, light path module and image sensor (507), it all is connected with control system (601) to spout valve (701), feed mechanism, image sensor (507) and light source, its characterized in that, the light source is laser source.
2. The laser interference color selection device according to claim 1, wherein the laser light source is a visible laser light source.
3. The laser interference color selection device according to claim 2, wherein the image sensor (507) is a high-speed linear array color image sensor or a high-speed linear array black-and-white image sensor.
4. The laser interference color selection device according to claim 2, wherein the laser light source is an infrared laser light source.
5. The laser interference color selection device according to claim 4, wherein the image sensor (507) is an infrared image sensor.
6. The laser interference color selection device according to any one of claims 1 to 5, wherein the intensity of the laser light source is greater than 10 mW.
7. The laser interference color selection device according to claim 6, wherein the intensity of the laser light source is 15mW to 20 mW.
8. The laser interference color selection device according to claim 1, wherein the optical path module comprises a laser beam expanding collimation system (503), a half-mirror (505), a first plane mirror (511) and a plane mirror (509),
the light emitted by the laser source (501) is uniformly expanded and collimated by the laser beam expanding and collimating system (503) and then irradiates to the half-transmitting and half-reflecting mirror (505) to be divided into two beams of transmission and reflection light,
the light transmitted by the half mirror (505) irradiates the plane mirror (509) and is reflected back to the half mirror (505) against the incident direction for the second reflection to obtain a reference beam,
the light reflected by the semi-transparent and semi-reflective mirror (505) irradiates the material, and then is reflected back to the semi-transparent and semi-reflective mirror (505) through the surface of the material to be transmitted, so as to obtain a measuring beam,
the measuring light beams and the reference light beams are interfered after passing through the semi-transparent semi-reflecting mirror (505), interference fringes with alternate light and shade are generated, the interference fringes are received by the image sensor (507), are transmitted to the control system (601), are subjected to image algorithm analysis, the quality of materials is judged, and then the switch of the spray valve (701) is controlled, so that the materials are screened.
9. The device for color selection by laser interference of claim 8, wherein the half mirror (505) is mounted at an angle of 45 degrees to the incident light, and the transmission and reflection ratio is 50/50.
10. The laser interference color selection device according to claim 1, wherein there are two optical systems, and the two optical systems are respectively disposed on two sides of the material falling point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010603238.9A CN111715560A (en) | 2020-06-29 | 2020-06-29 | Laser interference color sorting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010603238.9A CN111715560A (en) | 2020-06-29 | 2020-06-29 | Laser interference color sorting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111715560A true CN111715560A (en) | 2020-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010603238.9A Pending CN111715560A (en) | 2020-06-29 | 2020-06-29 | Laser interference color sorting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111715560A (en) |
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2020
- 2020-06-29 CN CN202010603238.9A patent/CN111715560A/en active Pending
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