Active spectral imaging equipment and production line

Abstract

The utility model relates to an active spectral imaging device and a production line. The shooting end of the industrial camera faces the conveying surface of the conveying belt; the multispectral light source comprises a plurality of white light LEDs capable of generating light with different wavelengths, the output ends of the white light LEDs face the conveying belt, and narrow-band light filters are arranged at the output ends of the white light LEDs; the power supply is respectively connected with the industrial camera and the multispectral light source; and the computer is connected with the industrial camera. According to the spectral imaging device, the white light LED and the narrow-band spectrum characteristics of the narrow-band optical filter are fully utilized, the two-dimensional image of the hyperspectral image cube of the target object in the wave band can be obtained through single imaging, and the complete hyperspectral image cube of the target object can be obtained through sequential imaging according to LED array wavelength distribution. A light splitting element in a traditional active hyperspectral system is not needed, the structure is simpler and more stable, the cost of an imaging system is greatly reduced, and meanwhile the performance and reliability of detection imaging are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of spectral imaging equipment, in particular to an active spectral imaging equipment and a production line. Background Art

[0002] A spectral imaging equipment is a technical instrument that can obtain wavelength information beyond the visible range of the human eye, and its application range is very wide. The spectral imaging equipment collects spectral information reflected or radiated by an object, uses a spectral collector to collect spectral data at different wavelengths, and processes and analyzes the data through professional software. The spectral imaging equipment can convert the collected spectral data into an image, and by analyzing the image, information such as the composition and surface characteristics of the object can be obtained.

[0003] In industrial sorting, the spectral imaging equipment can help achieve efficient and accurate sorting of products, improving the sorting efficiency and quality. In the food industry, the spectral imaging equipment can be used for rapid and non-destructive detection and sorting of foods. By analyzing the spectral information on the surface of the foods, functions such as foreign object detection, quality evaluation, and variety identification of the foods can be realized. In the agricultural product industry, the spectral imaging equipment can be used for rapid and accurate sorting of agricultural products such as fruits and vegetables. By analyzing the spectral information on the surface of the agricultural products, detection and sorting of characteristics such as the size, color, and maturity of the agricultural products can be realized. In the chemical industry, the spectral imaging equipment can be used for functions such as component identification and quality evaluation of chemical products. By analyzing the spectral information on the surface of the chemical products, rapid detection and analysis of information such as the components and purity of the products can be realized.

[0004] A "sorting equipment for active excitation-induced multi-spectral imaging" with the publication number of "CN204866599U" discloses a sorting equipment for active excitation-induced multi-spectral imaging, which includes a frame, a material to be inspected conveying device, an active excitation light source, a multi-spectral imaging device, a sorting execution device, and a central processing computer; the method for realizing multi-spectral is achieved by the multi-spectral imaging device. The optical information from the material to be inspected is collected with a set field of view angle and aperture and then enters the spectroscopic system, which divides the light equally or in a designed manner into N optical paths: the first optical path, the second optical path... the (N - 1)th optical path and the Nth optical path. In the multi-spectral imaging device, a completely equivalent imaging camera is configured on each optical path, including a band-pass filter, a diaphragm, a narrow-band filter, a focal plane array, and a lens group capable of transforming light rays, etc. The whole equipment requires many imaging cameras, with a complex structure and relatively high manufacturing and use costs. Content of the Utility Model

[0005] To this end, the technical problem to be solved by the present utility model is to overcome the problems in the prior art that the structure of the spectral imaging device is complex, and the manufacturing and use costs are relatively high.

[0006] To solve the above technical problem, the present utility model provides an active spectral imaging device for sorting products conveyed on a production line, including,

[0007] A conveyor belt for conveying products;

[0008] An industrial camera disposed on one side of the conveyor belt, and the shooting end of the industrial camera faces the conveying surface of the conveyor belt;

[0009] A multi-spectral light source including a plurality of white light LEDs for generating lights of different wavelengths, the output ends of the white light LEDs all face the conveying surface of the conveyor belt, and narrow-band filters are provided at the output ends of the white light LEDs;

[0010] A power supply respectively connected to the industrial camera and each of the white light LEDs;

[0011] A computer connected to the industrial camera.

[0012] In an embodiment of the present utility model, a light-shielding box is further included, the conveyor belt passes through the light-shielding box, and the industrial camera and the multi-spectral light source are both located in the light-shielding box.

[0013] In an embodiment of the present utility model, the light-shielding box is made of a black light-absorbing material.

[0014] In an embodiment of the present utility model, the multi-spectral light source further includes a base, a plurality of through holes arranged in an array are formed on the base, cylindrical mounting seats are fitted in each of the through holes, and each of the white light LEDs is respectively disposed on each of the mounting seats.

[0015] In an embodiment of the present utility model, a mounting hole is coaxially formed on the mounting seat, the white light LED is mounted in the mounting hole, and the narrow-band filter is provided on the end face of the mounting seat close to the output end of the white light LED.

[0016] In an embodiment of the present utility model, a light homogenizing and diffusing sheet covering the narrow-band filter is connected to one surface of the base close to the output ends of the white light LEDs.

[0017] In an embodiment of the present utility model, the plurality of white light LEDs are arranged in a rectangular array or a circular array.

[0018] In an embodiment of the present utility model, the power supply adopts a rectified power supply.

[0019] In an embodiment of the present utility model, the industrial camera is a area array camera.

[0020] A production line includes the spectral imaging device as described in any one of the above.

[0021] The above technical solution of the present utility model has the following advantages compared with the prior art:

[0022] An active spectral imaging device and a production line according to the present utility model include a conveyor belt; an industrial camera disposed on one side of the conveyor belt with its shooting end facing the conveying surface of the conveyor belt; a multi-spectral light source including a plurality of white light LEDs capable of generating lights of different wavelengths, the output ends of the white light LEDs all facing the conveying surface of the conveyor belt, and narrow-band filters being provided at the output ends of the white light LEDs; a power supply respectively connected to the industrial camera and the multi-spectral light source; and a computer connected to the industrial camera. This spectral imaging device makes full use of the characteristics of the narrow-band spectra of the white light LEDs and the narrow-band filters. A two-dimensional image of the target object in the high-spectral image cube in this wavelength band can be obtained by single imaging. By imaging in sequence according to the wavelength distribution of the LED array, a complete high-spectral image cube of the target object can be obtained. There is no need for a spectral splitting element in the traditional active high-spectral system, the structure is simpler and more stable, and the cost of the imaging system is greatly reduced. At the same time, the performance and reliability of the detection imaging are also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the content of the present utility model easier to be clearly understood, the following further describes the present utility model in detail according to the specific embodiments of the present utility model in conjunction with the drawings, where

[0024] Figure 1 is a schematic diagram of the overall structure of the active spectral imaging device according to the preferred embodiment of the present utility model;

[0025] Figure 2 is a schematic diagram of the first arrangement mode of the white light LEDs of the active spectral imaging device according to the preferred embodiment of the present utility model;

[0026] Figure 3 is a schematic diagram of the second arrangement mode of the white light LEDs of the active spectral imaging device according to the preferred embodiment of the present utility model;

[0027] Figure 4 is a schematic diagram of the white light LEDs of the active spectral imaging device according to the preferred embodiment of the present utility model.

[0028] Description of the reference numerals in the drawings: 1, conveyor belt; 2, industrial camera; 3, multi-spectral light source; 31, white light LED; 32, narrow-band filter; 33, mounting seat; 4, power supply; 5, computer; 6, light-shielding box. Detailed implementation manners

[0029] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the illustrated embodiments are not intended to limit the present utility model.

[0030] Embodiment 1

[0031] Referring to Figures 1-4 As shown, an active spectral imaging device of the present utility model is used for sorting products conveyed on a production line, including,

[0032] A conveyor belt 1 for conveying products;

[0033] An industrial camera 2 is arranged on one side of the conveyor belt 1, and the shooting end of the industrial camera 2 faces the conveying surface of the conveyor belt 1;

[0034] A multi-spectral light source 3 includes a plurality of white light LEDs 31 arranged in an array and used for generating lights of different wavelengths. The output ends of the white light LEDs 31 all face the conveying surface of the conveyor belt 1, and narrow-band filters 32 are arranged at the output ends of the white light LEDs 31;

[0035] A power supply 4 is respectively connected to the industrial camera 2 and each white light LED 31;

[0036] A computer 5 is connected to the industrial camera 2.

[0037] Specifically, the wavelength band range of the white light LED 31 is relatively wide, and the required spectral channel parameters can be obtained through the cooperation with the narrow-band filter 32.

[0038] Specifically, the computer 5 is installed with recognition software. The recognition result and the position information of the inspected material are sent to the sorting mechanism of the production line, and the sorting mechanism can realize the sorting operation of the material according to the conveyed information. Specifically, the recognition software analyzes the obtained image information and compares the image with a standard sample, so as to realize the recognition of the material type; the computer 5 issues a sorting execution instruction to the sorting execution device according to the result obtained by the recognition software in combination with the position information of the inspected material, and realizes the material sorting operation.

[0039] This spectral imaging device makes full use of the characteristics of the narrow-band spectrum of the white light LED 31 and the narrow-band filter 32. In a single imaging, a two-dimensional image of the target object's hyperspectral image cube in this wavelength band can be obtained. By imaging sequentially according to the wavelength distribution of the LED array, a complete hyperspectral image cube of the target object can be obtained. This imaging device uses an array of white light LEDs 31 as the light source of the active hyperspectral imaging system, eliminating the need for a spectral splitting element in traditional hyperspectral systems. The structure is simpler and more stable, significantly reducing the cost of the imaging system, while also improving the performance and reliability of detection imaging.

[0040] Further, it also includes a light-shielding box 6. The conveyor belt 1 passes through the light-shielding box 6, and the industrial camera 2 and the multispectral light source 3 are both located in the light-shielding box 6.

[0041] Further, the light-shielding box 6 is made of a black extinction material to ensure that the material inspection process is not affected by external ambient light, ensuring the accuracy of the detection results.

[0042] Refer to Figure 4 As shown, further, the multispectral light source 3 also includes a base. Multiple through holes arranged in an array are provided on the base, and cylindrical mounting seats 33 are fitted in each through hole. Each white light LED 31 is respectively arranged on each mounting seat 33.

[0043] Further, a mounting hole is coaxially provided on the mounting seat 33. The white light LED 31 is installed in the mounting hole, and a narrow-band filter 32 is provided on the end face of the mounting seat 33 close to the output end of the white light LED 31. Specifically, each mounting seat 33, white light LED 31, and narrow-band filter 32 form a light source module, and different light source modules can be replaced according to actual needs.

[0044] Further, a light homogenizing and diffusing sheet covering the narrow-band filter 32 is connected to one side of the base close to the output end of each white light LED 31.

[0045] Refer to Figure 2 and Figure 3 As shown, further, multiple white light LEDs 31 are arranged in a rectangular array or a circular array.

[0046] Further, the power supply 4 uses a rectified power supply. The power supply 4 can output a trigger signal from the outside to trigger the multispectral light source 3, or can output a trigger signal from the outside to trigger the stroboscopic controller, outputting a trigger signal to simultaneously trigger the multispectral light source 3 and the industrial camera 2. In this way, the synchronous triggering of the multispectral light source 3 and the industrial camera 2 can be achieved, thus ensuring the stability and detection accuracy of the entire imaging device.

[0047] Furthermore, the industrial camera 2 is an area array camera and is equipped with an industrial lens. The industrial camera 2 supports automatic or manual adjustment of gain, exposure time, white balance, Gamma, LUT correction, etc.; supports custom ROI, horizontal mirroring and vertical mirroring; supports hard trigger, soft trigger and free running mode; has a compact structure and can meet the installation requirements for smaller spaces. The industrial camera 2 is installed on the conveyor line to replace the human eye for measurement and judgment. It converts the target captured by digital images into image signals and transmits them to a dedicated image processing system. The image processing system performs various operations on these signals to extract the features of the target, and then controls the actions of on-site equipment according to the discrimination results.

[0048] Embodiment 2

[0049] The present utility model also discloses a production line, including the spectral imaging device as in Embodiment 1.

[0050] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. An active spectral imaging device for sorting products conveyed on a production line, characterized in that, Comprising: A conveyor belt for conveying products. An industrial camera disposed on one side of the conveyor belt, with the shooting end of the industrial camera facing the conveying surface of the conveyor belt. A multi-spectral light source, which includes a plurality of white light LEDs for generating light of different wavelengths. The output ends of the white light LEDs all face the conveying surface of the conveyor belt, and narrow-band filters are provided at the output ends of the white light LEDs. A power supply connected to the industrial camera and each of the white light LEDs respectively. A computer connected to the industrial camera.

2. The active spectral imaging device according to claim 1, wherein: It further includes a light-shielding box through which the conveyor belt passes, and the industrial camera and the multi-spectral light source are both located in the light-shielding box.

3. The active spectral imaging device according to claim 2, wherein: The light-shielding box is made of a black light-absorbing material.

4. The active spectral imaging device according to claim 1, wherein: The multi-spectral light source further includes a base on which a plurality of through holes are arranged in an array. Cylindrical mounting seats are fitted in each of the through holes, and each of the white light LEDs is respectively disposed on each of the mounting seats.

5. The active spectral imaging device according to claim 4, characterized in that: A mounting hole is coaxially provided on the mounting seat, and the white light LED is mounted in the mounting hole. A narrow-band filter is provided on the end face of the mounting seat close to the output end of the white light LED.

6. The active spectral imaging device according to claim 5, wherein: A light homogenizing and diffusing sheet covering the narrow-band filter is connected to the surface of the base close to the output end of each of the white light LEDs.

7. The active spectral imaging device according to claim 1, wherein: The plurality of white light LEDs are arranged in a rectangular array or a circular array.

8. The active spectral imaging device according to claim 1, wherein: The power supply uses a rectified power supply.

9. The active spectral imaging device according to claim 1, wherein: The industrial camera uses a area array camera.

10. A production line, characterized in that: Including the spectral imaging device according to any one of claims 1-9.

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