Detection device, detection system, and method for removing specular reflection of detection device

Abstract

Provided are a detection device, a detection system, and a method for removing specular reflection of the detection device, relating to the technical field of detection. The detection device comprises a light source (100), a detector (200), and a detection window sheet (300). The light source (100) and the detector (200) are located on the same side of the detection window sheet (300), light emitted by the light source (100) can pass through the detection window sheet (300) and irradiate an object to be tested (400), the detector (200) is used for receiving reflected light of said object (400), and an acquisition path of the detector (200) passes through the detection window sheet (300). The detection device further comprises a blocking member (500), the blocking member (500) and the light source (100) are located on the same side of the detection window sheet (300), the blocking member (500) is located on a path where first light (720) is located and used for blocking the first light (720), and the first light (720) is light emitted from the light source (100) and corresponding to specularly reflected light reflected by the detection window sheet (300) onto the detector (200). The detection device, the detection system, and the method for removing specular reflection of the detection device solve the problems that the detection window sheet (300) affects the accuracy of a detection result of said object (400) and the detection device has a large size and a complex structure.

Description

Detection device, detection system and method for removing specular reflection of detection device

[0001] The present application claims priority to the Chinese patent application No. 202410763290.9, filed on June 12, 2024, and entitled "Detection device, detection system and method for removing specular reflection of detection device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application belongs to the technical field of detection, and in particular relates to a detection device, a detection system and a method for removing specular reflection of the detection device. BACKGROUND

[0003] In the current detection device for online measurement of reflection spectrum, in order to achieve the performance of waterproof and dustproof, the detection device needs to be packaged. A detection window sheet is generally used to package the detection end of the detection device to realize the irradiation and collection of optical signals. The specular reflection generated by the detection window sheet under the irradiation of the light source will be received by the detector of the detection device. Since this part of the specular reflection signal does not carry the spectral information of the measured object, it is easy to cause the detection result of the detection device to be inaccurate.

[0004] To remove this part of the specular reflection signal, the commonly used means is to increase the angle and distance between the detector and the light source to physically avoid the specular reflection. However, this method makes the volume of the detection device larger, and the effect of removing the specular reflection signal is not ideal. Alternatively, a relatively complex calibration module and algorithm can also be used, which greatly increases the structural complexity and cost of the detection device.

[0005] Therefore, the existing detection device has the problems of affecting the accuracy of the detection result of the measured object by the detection window sheet thereof, and the large volume and complex structure thereof. SUMMARY

[0006] The purpose of the embodiments of the present application is to provide a detection device, a detection system and a method for removing specular reflection of the detection device, which can solve the problem in the related art that the detection device has the problems of affecting the accuracy of the detection result of the measured object by the detection window sheet thereof, and the large volume and complex structure thereof.

[0007] In order to solve the above technical problems, the present application adopts the following technical solutions:

[0008] A detection device, comprising a light source, a detector and a detection window sheet, the light source and the detector are located on the same side of the detection window sheet, the light emitted by the light source can pass through the detection window sheet to irradiate on a measured object, the detector is used to receive the reflected light of the measured object, and the collection path of the detector passes through the detection window sheet.

[0009] The detection device further comprises a blocking piece, the blocking piece is located on the same side of the detection window sheet as the light source, the blocking piece is located on the path of the first light and is used to block the first light, the first light is the light emitted by the light source and corresponds to the specular reflection light reflected by the detection window sheet to the detector.

[0010] A detection system comprises a spectrometer and the detection device described above, the detector of the detection device is in communication connection with the spectrometer.

[0011] A method for removing the specular reflection of a detection device, applied to the detection device described above, comprising:

[0012] According to the received light of the detector, the path of the first light emitted by the light source corresponding to the specular reflection light of the detection window sheet is calculated;

[0013] The blocking piece is located on the same side of the detection window sheet as the detector, and the blocking piece is arranged on the path of the first light to block the first light.

[0014] In the embodiments of the present application, the blocking piece is arranged on the path of the first light and is used to block the first light, the first light is the light emitted by the light source and corresponds to the specular reflection light reflected by the detection window sheet to the detector, when the detection device detects the measured object, the first light can be blocked by the blocking piece, so that the specular reflection light of the detection window sheet received by the detector is basically eliminated, and since the measured object is still illuminated by the light source and generates reflected light, the light received by the detector basically only contains the reflected light of the measured object, and the specular reflection light of the detection window sheet is reduced or eliminated, so that the detector basically only receives the reflected signal of the measured object, thereby eliminating or reducing the influence of the specular reflection of the detection window sheet on the accuracy of the detection result of the measured object, improving the accuracy of the detection result of the detection device, and since the present application eliminates or reduces the influence of the specular reflection of the detection window sheet on the accuracy of the detection result of the measured object by using the blocking piece to block the first light, the present application does not need to increase the angle and distance between the detector and the light source to physically avoid the specular reflection, that is, the present application does not need to increase the volume of the detection device or use a relatively complex calibration module and algorithm to eliminate or reduce the specular reflection light of the detection window sheet, which makes the detection device disclosed by the present application have a smaller volume and a simpler structure. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings described herein are used to provide further understanding of the present application, and form a part of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application.

[0016] FIG. 1 is a structural schematic diagram of a detection device according to an embodiment of the present application;

[0017] FIG. 2 is a schematic diagram of a detection device using a non-collimated detector according to an embodiment of the present application;

[0018] FIG. 3 is a schematic diagram of a detection device using multiple detectors according to an embodiment of the present application;

[0019] FIG. 4 is a schematic diagram of a detection device using multiple collimated detectors according to an embodiment of the present application;

[0020] FIG. 5 is a structural schematic diagram of a blocking piece arranged in a cavity through a support according to an embodiment of the present application;

[0021] FIGS. 6 and 7 are structural schematic diagrams of a blocking piece and multiple supports connected according to an embodiment of the present application;

[0022] FIG. 8 is a structural schematic diagram of a blocking piece arranged in a support through a second sliding rail and the support arranged in a cavity through a first sliding rail according to an embodiment of the present application;

[0023] FIGS. 9 and 10 are structural schematic diagrams of a blocking piece with variable light shielding area according to an embodiment of the present application;

[0024] FIGS. 11 to 14 are structural schematic diagrams of different light sources according to an embodiment of the present application;

[0025] FIGS. 15 and 16 are structural schematic diagrams of different detectors according to an embodiment of the present application;

[0026] FIG. 17 is a schematic diagram of the difference between the signals of a measured object detected by a detector without a blocking piece and with a blocking piece according to an embodiment of the present application;

[0027] FIG. 18 is a schematic diagram of the difference between the signals of a specularly reflected light detected by a detector without a blocking piece and with a blocking piece according to an embodiment of the present application;

[0028] FIGS. 19 and 20 are flow schematic diagrams of a method for removing specular reflection of a detection device according to an embodiment of the present application;

[0029] FIG. 21 is a schematic diagram of a detection device according to an embodiment of the present application.

[0030] The reference signs are explained as follows: 100-light source, 110-lamp cup light source, 120-collimated light source, 130-reflective light source, 140-reflective collimated light source; 200-detector, 210-non-collimated detector, 220-collimated detector, 221-acquisition optical fiber, 222-collimating lens; 300-detection window sheet; 400-object to be detected; 500-obstruction piece, 510-fan-shaped piece; 610-cavity, 620-supporting piece, 630-first sliding rail, 640-second sliding rail; 710-reflected light, 720-first light, 730-second light; 810-diameter of the receptive field of the collimating lens, 820-angle between the reflected light and the normal line, 830-diameter of the obstruction piece, 840-distance between the lamp cup light source and the detection window sheet, 850-distance between the obstruction piece and the lamp cup light source, 860-distance between the center of the receptive field on the detection window sheet and the center of the detection window sheet. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0032] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a category and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0033] The detection device provided by the embodiments of the present application will be described in detail below in combination with the drawings and specific embodiments and application scenarios.

[0034] Please refer to FIGS. 1-20, the present application discloses a detection device, the disclosed detection device includes a light source 100, a detector 200 and a detection window sheet 300.

[0035] The light source 100 is a component in the detection device for emitting light onto the to-be-detected object 400. Optionally, the wavelength band of the light emitted by the light source 100 can be ultraviolet to near-infrared. It should be noted that the to-be-detected object 400 herein can be a finished product, a semi-finished product, a raw material, or any other to-be-detected object. The detection window sheet 300 is used to block the detection port of the detection device. The light source 100 and the detector 200 are located on the same side of the detection window sheet 300, and the detection window sheet 300 faces the to-be-detected object 400, so that the light emitted by the light source 100 can pass through the detection window sheet 300 and irradiate onto the to-be-detected object 400. The detector 200 is used to receive the reflected light 710 reflected by the to-be-detected object 400, thereby obtaining information of the to-be-detected object 400, and the collection path of the detector 200 passes through the detection window sheet 300, that is, the reflected light 710 reflected by the to-be-detected object 400 can be collected by the detector 200 after passing through the detection window sheet 300.

[0036] The detection device can further include a blocking piece 500. The blocking piece 500 is located on the same side of the detection window sheet 300 as the light source 100, and is located between the light source 100 and the detection window sheet 300. Meanwhile, the blocking piece 500 is located on the path of the first light 720 and is used to block the first light 720. The first light 720 is the light emitted by the light source 100 and corresponds to the specularly reflected light reflected by the detection window sheet 300 to the detector 200, that is, if there is no blocking piece 500, the first light 720 will irradiate onto the detection window sheet 300, and after being reflected by the detection window sheet 300, the specularly reflected light will be formed and will be collected by the detector 200. However, in the present application, that is, after the blocking piece 500 is provided, the first light 720 can be blocked by the blocking piece 500, which makes the specularly reflected light of the detection window sheet 300 received by the detector 200 substantially eliminated. Meanwhile, the to-be-detected object 400 will still be irradiated by the second light 730 emitted by the light source 100 and generate the reflected light 710, that is, at this time, the light received by the detector 200 basically only contains the reflected light 710 of the to-be-detected object 400. Optionally, the number of the above-mentioned reflected light 710, the number of the first light 720, and the number of the second light 730 can each be one or more.

[0037] Meanwhile, since the blocking piece 500 is located in the detection device, that is, the distance between the blocking piece 500 and the to-be-detected object 400 is far, which makes the multiple second lights 730 emitted by the light source 100 can irradiate onto the to-be-detected object 400. Although the first light 720 is blocked by the blocking piece 500, the multiple second lights 730 irradiated onto the to-be-detected object 400 will still form a complete light spot. At this time, compared with the reflected light 710 of the to-be-detected object 400 when there is no blocking piece 500, the present application only has a small decrease in the light intensity of the reflected light 710, but the adverse effect of the decrease in the light intensity on the accuracy of the detection result of the to-be-detected object 400 is still small.

[0038] In the embodiment of the present application, the blocking piece 500 is arranged on the path of the first light 720 corresponding to the mirror reflection light reflected by the detection window sheet 300 to the detector 200, and is used to block the first light 720 emitted by the light source 100. When the detection device detects the to-be-detected object 400, the first light 720 can be blocked by the blocking piece 500, so that the mirror reflection light of the detection window sheet 300 received by the detector 200 is basically eliminated. Since the to-be-detected object 400 is still irradiated by the light source 100 and generates the reflected light 710, the light received by the detector 200 basically only contains the reflected light 710 of the to-be-detected object 400, and the mirror reflection light of the detection window sheet 300 is reduced or eliminated, so that the detector 200 basically only receives the reflected signal of the to-be-detected object 400. In this way, the influence of the mirror reflection of the detection window sheet 300 on the accuracy of the detection result of the to-be-detected object 400 can be eliminated or reduced, and the accuracy of the detection result of the detection device is improved.

[0039] Meanwhile, since the influence of the mirror reflection of the detection window sheet 300 on the accuracy of the detection result of the to-be-detected object 400 can be eliminated or reduced by using the blocking piece 500 to block the first light 720, the present application does not need to increase the angle and distance between the detector 200 and the light source 100 to physically avoid the mirror reflection, that is, the present application does not need to increase the volume of the detection device or use a relatively complex calibration module and algorithm to eliminate or reduce the mirror reflection light of the detection window sheet 300. This makes the detection device disclosed by the present application have a smaller volume and a simpler structure.

[0040] Please refer to FIG. 2. The detector 200 can be a non-collimated detector 210, that is, the reflected light 710 received by the detector 200 has a certain divergence angle at this time, and at this time, the plurality of first lights 720 are non-parallel light, that is, the plurality of first lights 720 are closer and closer with the increase of the propagation distance. Therefore, the cross-sectional area of the light coverage area formed by the plurality of first lights 720 at different positions is different, so the size of the blocking piece 500 required when the blocking piece 500 is placed at different positions on the propagation path of the first light 720 is different, that is, the light blocking area of the blocking piece 500 required is different. Alternatively, the blocking piece 500 can be arranged away from the detection window sheet 300, that is, the blocking piece 500 is arranged close to the light source 100, as shown by the solid line in FIG. 2. At this time, the light blocking area of the blocking piece 500 is larger, that is, the size of the blocking piece 500 is larger.

[0041] In another embodiment, the blocking piece 500 can be arranged close to the detection window sheet 300, and the blocking piece 500 is arranged away from the light source 100, as shown by the dashed line in FIG. 2. At this time, the cross-sectional area of the light coverage area formed by the plurality of first light rays 720 is small at this position, and thus the light blocking area of the blocking piece 500 required is small, that is, the size of the blocking piece 500 required is small, which makes the material for manufacturing the blocking piece 500 less, and thus the production cost is low. As can be seen, when the non-collimated detector 210 is used for detection, the light blocking area required for the blocking piece 500 is different when the blocking piece 500 is placed at different positions, that is, the minimum size of the blocking piece 500 is different, and the farther the blocking piece 500 is arranged from the light source 100, the smaller the light blocking area of the blocking piece 500 required, that is, the smaller the size of the blocking piece 500.

[0042] Optionally, the detector 200 can be the non-collimated detector 210 as described above.

[0043] In another embodiment, referring to FIGS. 1 and 4, the detector 200 can be a collimated detector 220, that is, the collimated detector 220 can make the received plurality of reflected light rays 710 be parallel light. Specifically, the collimated detector 220 can include a collection optical fiber 221 and a collimating lens 222, the collection optical fiber 221 is located on the side of the collimating lens 222 away from the detection window sheet 300, and the focal point of the collimating lens 222 falls on the collection optical fiber 221, that is, the reflected light rays 710 passing through the collimating lens 222 can be collected by the collection optical fiber 221, and the collimating lens 222 can be used to collimate the reflected light rays 710, and since the divergence angle of the collimated reflected light rays 710 is small, the collimated reflected light rays 710 are more easily collected by the collection optical fiber 221, thereby improving the detection accuracy of the measured object 400.

[0044] Optionally, referring to FIGS. 1 and 4, the light blocking area of the blocking piece 500 can be equal to the receptive field area of the collimating lens 222, that is, at this time, the cross-sectional area of the light coverage area formed by the plurality of reflected light rays 710 received by the collimating lens 222 is equal to the light blocking area of the blocking piece 500, and the blocking piece 500 can just block the plurality of first light rays 720, thereby just avoiding the mirror reflected light rays corresponding to the first light rays 720. At the same time, the blocking piece 500 will not block the light rays other than the first light rays 720, so that more light rays can irradiate the measured object 400, thereby improving the detection accuracy of the measured object 400. Of course, the light blocking area of the blocking piece 500 can also be greater than the receptive field area of the collimating lens 222.

[0045] In the above embodiment, since the detector 200 adopted is the collimating detector 220, that is, the received multiple reflected light rays 710 are all parallel light, the first light ray 720 is also parallel light, and the first light ray 720 is generally light obliquely emitted, therefore, in order to make the light shielding area of the blocking piece 500 equal to the sensitive field area of the collimating lens 222, that is, in order to make the blocking piece 500 can just shield the multiple first light rays 720, the extending direction of the blocking piece 500 and the extending direction of the detection window sheet 300 have an included angle, that is, the blocking piece 500 is arranged obliquely relative to the detection window sheet 300, at this time, the extending direction of the blocking piece 500 is perpendicular to the incident direction of the first light ray 720, and the light shielding area of the blocking piece 500 is not only equal to the sensitive field area of the collimating lens 222, but also equal to the area of the cross section of the light ray coverage area formed by the multiple first light rays 720, so that the blocking piece 500 can just shield the multiple first light rays 720, and at this time, the size of the blocking piece 500 is the minimum size at this position, and the minimum size required when the blocking piece 500 is placed at different positions is the same. Wherein, the extending direction of the blocking piece 500 is the direction parallel to the plane to which the blocking piece 500 belongs, and the extending direction of the detection window sheet 300 is the direction parallel to the plane to which the detection window sheet 300 belongs.

[0046] Optionally, the detection device can include one detector 200, that is, the number of detectors 200 can be one.

[0047] In another embodiment, please refer to FIG. 3 and FIG. 4, the detection device includes at least two detectors 200, that is, the number of detectors 200 can be at least two, each detector 200 is distributed along the circumference of the light source 100, that is, each detector 200 is arranged at intervals, and the collection path of each detector 200 passes through the detection window sheet 300, that is, the different reflected light rays 710 reflected by the to-be-detected article 400 can be correspondingly collected by different detectors 200 after passing through the detection window sheet 300, thereby further improving the accuracy of the detection result of the detection device on the to-be-detected article 400.

[0048] Optionally, in the above embodiment, in order to avoid that different first light rays 720 are reflected to different detectors 200 through the detection window sheet 300, the application can adopt multiple blocking pieces 500 to shield different first light rays 720 respectively, thereby reducing or eliminating the multiple specular reflected light rays corresponding to the multiple first light rays 720 reflected to different detectors 200.

[0049] In another embodiment, the blocking piece 500 is located at the coverage position of the first light rays 720 reflected by the detection window sheet 300 to the detectors 200, specifically, at the convergence position of the multiple first light rays 720 corresponding to the multiple reflected light rays reflected by the detection window sheet 300 to different detectors 200, that is, at the position where all the first light rays 720 propagating in different directions converge, which is the coverage position of the first light rays 720. The blocking piece 500 can be arranged at the coverage position to block the multiple first light rays 720 at the same time, that is, the same blocking piece 500 is used to block the multiple first light rays 720 corresponding to the reflected light rays entering different detectors 200 at the same time, which makes the number of blocking pieces 500 used in the application smaller, and thus the production cost is lower.

[0050] Optionally, the light-blocking area of the blocking piece 500 can be equal to the minimum coverage area of the first light rays 720, and the blocking piece 500 is located at the position corresponding to the minimum coverage area of the first light rays 720, that is, the blocking piece 500 can be arranged at the position with the minimum coverage area of the first light rays 720. At this time, while ensuring that the blocking piece 500 can just block the first light rays 720, the light-blocking area of the blocking piece 500 is smaller, that is, the size of the blocking piece 500 is smaller, and thus the amount of material used to make the blocking piece 500 is smaller, and thus the production cost is lower. Of course, the light-blocking area of the blocking piece 500 can also be larger than the minimum coverage area of the first light rays 720.

[0051] Next, the detection device provided by the embodiments of the application will be described with a specific example.

[0052] Referring to FIG. 21, the light source in FIG. 21 is a lamp cup light source 110; and the detector is a collimating detector 200, which includes a collection optical fiber 221 and a collimating lens 222.

[0053] Specifically, the receptive field diameter 810 of the collimating lens 222 is 3 centimeters (cm), the included angle 820 between the reflected light rays 710 and the normal line is 10 degrees (°), the distance 840 between the lamp cup light source 110 and the detection window sheet 300 is 42 cm, and the distance 860 between the center of the receptive field on the detection window sheet 300 and the center of the detection window sheet 300 is 5.2 cm. In this scenario, the blocking piece 500 is placed horizontally, the diameter 830 of the blocking piece is 3.5 cm, and the distance 850 between the blocking piece 500 and the lamp cup light source is 13.6 cm. Based on this, the first light rays 720 can be just blocked by using the blocking piece 500.

[0054] Optionally, referring to FIG. 5 and FIG. 8, the detection device can further comprise a cavity 610, the light source 100 and the detector 200 are arranged in the cavity 610, that is, the cavity 610 can protect the light source 100 and the detector 200, the cavity 610 is provided with a detection port, and the detection window sheet 300 is arranged at the detection port (it can be understood that the detection window sheet 300 and the detector 200 are not shown in FIG. 5 and FIG. 8), that is, the detection window sheet 300 is used to block the detection port.

[0055] In some embodiments, in order to maintain the relative movement of the blocking piece 500 and the light source 100, the detector 200 and the detection window sheet 600, the blocking piece 500 can be connected with the light source 100 or the detector 200 through the support 620, that is, the blocking piece 500 is arranged on the light source 100 or the detector 200 through the support 620.

[0056] Alternatively, in another embodiment, the blocking piece 500 can also be connected with the cavity 610 through the support 620, that is, the cavity 610 can be used as the arrangement basis of the blocking piece 500, so as to avoid the influence of the blocking piece 500 on the arrangement stability of the light source 100 or the detector 200 in the cavity 610, and the support 620, the blocking piece 500 and the cavity 610 form a through hole for the light emitted by the light source 100 to pass through, that is, a through hole for the second light 730 described above to pass through, and the second light 730 can irradiate on the object 400 to be detected after sequentially passing through the through hole and the detection window sheet 300.

[0057] Optionally, referring to FIG. 6 and FIG. 7, the number of the support 620 can be at least two, and a plurality of supports 620 can be arranged around the blocking piece 500, that is, the blocking piece 500 can be arranged in the cavity 610 through a plurality of supports 620, so as to ensure the arrangement stability of the blocking piece 500 in the cavity 610.

[0058] Optionally, the blocking piece 500 and the support 620 can be fixedly connected, that is, the relative position of the blocking piece 500 and the support 620 is unchanged.

[0059] In another embodiment, please refer to FIG. 8, the blocking piece 500 is in sliding connection with the support 620, specifically, the blocking piece 500 or the support 620 can be provided with a second sliding rail 640, the blocking piece 500 is in sliding connection with the support 620 through the second sliding rail 640, and the blocking piece 500 or the support 620 can slide relative to the second sliding rail 640, so that the blocking piece 500 can slide relative to the support 620, that is, the relative position between the blocking piece 500 and the support 620 can change, and thus the position of the blocking piece 500 in the cavity 610 can change, specifically, the blocking piece 500 can slide relative to the support 620 in a direction perpendicular to the axis of the cavity 610, for example, from the position of the blocking piece 500 shown in solid line in FIG. 8 to the position of the blocking piece 500 shown in dotted line, so that the blocking piece 500 can flexibly shield different first light rays 720.

[0060] Optionally, the support 620 and the cavity 610 can be in fixed connection, that is, the relative position between the support 620 and the cavity 610 is unchanged.

[0061] In another embodiment, please refer to FIG. 8, the support 620 is in sliding connection with the cavity 610, specifically, the support 620 or the cavity 610 can be provided with a first sliding rail 630, the support 620 is in sliding connection with the cavity 610 through the first sliding rail 630, and the support 620 or the cavity 610 can slide relative to the first sliding rail 630, so that the support 620 and the blocking piece 500 can slide relative to the cavity 610, that is, the relative position between the whole composed of the support 620 and the blocking piece 500 and the cavity 610 can change, and thus the position of the support 620 and the blocking piece 500 in the cavity 610 can change, specifically, the support 620 can slide relative to the cavity 610 in the axial direction of the cavity 610, that is, at this time, the support 620 and the blocking piece 500 can simultaneously slide relative to the cavity 610 in the axial direction of the cavity 610, so that the blocking piece 500 can approach or move away from the light source 100, and thus can flexibly shield different amounts of first light rays 720.

[0062] Optionally, the light-shielding area of the blocking piece 500 is unchangeable.

[0063] In another embodiment, please refer to FIG. 9 and FIG. 10, the light-shielding area of the blocking piece 500 is changeable, so as to flexibly adjust the amount of first light rays 720 shielded by the blocking piece 500, thereby adapting to occasions with different needs.

[0064] Optionally, the blocking piece 500 can be a foldable component, so that the light-shielding area of the blocking piece 500 is changeable.

[0065] In another embodiment, the block 500 may include at least three sector plates 510, each sector plate 510 being movably connected to the support member 620. At least a portion of each sector plate 510 may overlap each other, so that the light-shielding area of ​​the block 500 can change stably and continuously, thereby enabling the block 500 to achieve more different light-shielding areas.

[0066] Optionally, referring to Figures 11 to 14, the light source 100 can be of various types, including a cup-type light source 110, a collimating light source 120, a reflective light source 130, and a reflective collimating light source 140. The cup-type light source 110 is a general illumination light source, the collimating light source 120 is a combination of the cup-type light source 110 and a collimating lens, the reflective light source 130 is a combination of the cup-type light source 110 and a reflector, and the reflective collimating light source 140 is a combination of the cup-type light source 110, a collimating lens, and a reflector. This application can flexibly use different types of light sources 100 to adapt to different needs and occasions.

[0067] Optionally, referring to Figures 15 and 16, the detector 200 can be a structure that directly receives reflected light 710, or a reflective receiving structure with a reflector. This application can flexibly use detectors 200 with different structures to adapt to different needs.

[0068] Optionally, referring to Figures 17 and 18, in order to verify the effect of the baffle 500 on eliminating specular reflection light, the test item 400 can be placed 30cm below the detection window 300 for testing. The signal of the test item 400 detected by the detector 200 and the change of specular reflection light are compared under the conditions of having the baffle 500 and not having the baffle 500. When the baffle 500 is installed, the signal of the test item 400 detected by the detector 200 is only reduced by about 20% compared with that without the baffle 500, while the specular reflection light is reduced from 40-60% when there is no baffle 500 to less than 5% when there is the baffle 500. This shows that the baffle 500 in this application has a good effect on eliminating specular reflection light and has little impact on the reflected light 710 of the test item 400.

[0069] Optionally, this application also discloses a detection system, including a spectrometer and the detection device described above. The detector 200 of the detection device is communicatively connected to the spectrometer. The detector 200 can transmit the collected reflected light 710 to the spectrometer. After measurement and calculation, the spectrometer can obtain information about the item to be tested 400, thereby improving the measurement accuracy and reliability.

[0070] Optionally, this application also discloses a method for removing specular reflections from a detection device, applied to the detection device described above, as shown in FIG19, the method comprising:

[0071] S100, according to the received light of the detector 200, the path of the first light 720 emitted by the light source 100 corresponding to the mirror reflection light of the detection window sheet 300 is calculated.

[0072] Specifically, according to the light receiving field of view of the detector 200, the path of the first light 720 emitted by the light source 100 corresponding to the mirror reflection light of the detection window sheet 300 is deduced. Alternatively, the path of the first light 720, i.e. the trajectory of propagation, can be analyzed by a computer or other light path analysis instrument.

[0073] S200, the blocking piece 500 is located on the same side of the detection window sheet 300 as the detector 200, and the blocking piece 500 is arranged on the path of the first light 720 to block the first light 720.

[0074] Specifically, after the path of the first light 720 is calculated, the blocking piece 500 can be located on the same side of the detection window sheet 300 as the detector 200, and the blocking piece 500 can be arranged only on the path of the first light 720 to block the first light 720 without affecting other lights. At this time, the light blocking area and position required by the blocking piece 500 to block the first light 720 can be calculated, so as to achieve the purpose of eliminating or reducing the mirror reflection light of the detection window sheet 300. Since the to-be-detected object 400 is still irradiated by the second light 730 of the light source 100 and generates the reflection light 710, the light received by the detector 200 basically only contains the reflection light 710 of the to-be-detected object 400.

[0075] In the embodiment of the present application, the blocking piece 500 is arranged on the path of the first light 720 and used to block the first light 720. That is, when the detection device detects the to-be-detected object 400, the first light 720 can be blocked by the blocking piece 500, so that the mirror reflection light of the detection window sheet 300 received by the detector 200 is basically eliminated. Since the to-be-detected object 400 is still irradiated by the light source 100 and generates the reflection light 710, the light received by the detector 200 basically only contains the reflection light 710 of the to-be-detected object 400. By reducing or eliminating the mirror reflection light of the detection window sheet 300, the detector 200 basically only receives the reflection signal of the to-be-detected object 400. In this way, the influence of the mirror reflection of the detection window sheet 300 on the accuracy of the detection result of the to-be-detected object 400 can be eliminated or reduced, and the accuracy of the detection result of the detection device can be improved.

[0076] Meanwhile, since the application can eliminate or reduce the influence of the mirror reflection of the detection window sheet 300 on the accuracy of the detection result of the measured object 400 by using the blocking piece 500 to block the first light 720, the application does not need to increase the angle and distance between the detector 200 and the light source 100 to physically avoid the mirror reflection, that is, the application does not need to increase the volume of the detection device or use a more complex calibration module and algorithm to eliminate or reduce the mirror reflection of the detection window sheet 300, which makes the detection device disclosed by the application have a smaller volume and a simpler structure.

[0077] Optionally, the detection device can include one detector 200.

[0078] In another embodiment, the detection device can include at least two detectors 200 to receive the reflected light 710 reflected by the measured object 400 in different directions. In the case where the detection device includes at least two detectors 200, as shown in FIG. 20, the method includes:

[0079] S300, according to the received light of each detector 200, the path of each first light 720 corresponding to the mirror reflection light reflected by the detection window sheet 300 to each detector 200 is calculated.

[0080] Specifically, the application can inversely deduce the path of each first light 720 emitted by the light source 100 corresponding to the mirror reflection light reflected by the detection window sheet 300 to each detector 200 according to the light receiving field of view of each detector 200.

[0081] S400, according to the path of each first light 720, the coverage position of each first light 720 is calculated and determined.

[0082] On the propagation path of each first light 720, there is a collection position where all first lights 720 propagating in different directions converge, that is, the coverage position of each first light 720. Specifically, the application can analyze the path of each first light 720, that is, the trajectory of propagation, by computer or other light path analysis instrument, so as to calculate the position where each first light 720 converges, thereby determining the coverage position. At this time, the application can determine the coverage position of each first light 720 in order to set the blocking piece 500.

[0083] S500, the blocking piece 500 is set at the coverage position.

[0084] Specifically, after the covering positions of the first light rays 720 are determined, the blocking piece 500 can be arranged at the covering positions so as to block the first light rays 720, that is, the same blocking piece 500 can be used to block the first light rays 720. Of course, different blocking pieces 500 can also be used to block different first light rays 720.

[0085] The embodiments of the present application are described above with reference to the drawings, but the present application is not limited to the specific embodiments described above, which are merely illustrative but not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. A detection device, characterized in that, The detection device comprises a light source (100), a detector (200) and a detection window sheet (300), the light source (100) and the detector (200) are located on the same side of the detection window sheet (300), the light emitted by the light source (100) can pass through the detection window sheet (300) to irradiate on an object to be detected (400), the detector (200) is used for receiving reflected light (710) of the object to be detected (400), and a collection path of the detector (200) passes through the detection window sheet (300); The detection device further comprises a blocking piece (500), the blocking piece (500) is located on the same side of the detection window sheet (300) as the light source (100), the blocking piece (500) is located on a path of first light (720) and is used for shielding the first light (720), the first light (720) is light emitted by the light source (100) and corresponding to specular reflection light reflected by the detection window sheet (300) to the detector (200).

2. The detection device of claim 1, wherein, The detector (200) is a non-collimating detector (210), and the blocking piece (500) is arranged close to the detection window sheet (300).

3. The detection device of claim 1, wherein, The detector (200) is a collimating detector (220), the collimating detector (220) comprises a collection optical fiber (221) and a collimating lens (222), the collection optical fiber (221) is located on a side of the collimating lens (222) away from the detection window sheet (300), a focal point of the collimating lens (222) falls on the collection optical fiber (221), and the collimating lens (222) is used for collimating the reflected light (710).

4. The detection device of claim 3, wherein, An area of light shielding of the blocking piece (500) is equal to an area of a receptive field of the collimating lens (222).

5. The detection device of claim 1, wherein, The detection device comprises at least two detectors (200), each of the detectors (200) is distributed along a circumference of the light source (100), and a collection path of each of the detectors (200) passes through the detection window sheet (300). The blocking piece (500) is located at a covering position of the first light (720) reflected by the detection window sheet (300) to each of the detectors (200).

6. The detection device of claim 5, wherein, An area of light shielding of the blocking piece (500) is equal to a minimum covering area of each of the first light (720), and the blocking piece (500) is located at a position corresponding to the minimum covering area of each of the first light (720).

7. The detection device of claim 1, wherein, The detection device further comprises a cavity (610), the light source (100) and the detector (200) are arranged in the cavity (610), and the cavity (610) is provided with a detection port, and the detection window sheet (300) is arranged at the detection port. The blocking piece (500) is connected with the cavity (610) through a support (620), and a through hole is formed among the support (620), the blocking piece (500) and the cavity (610) to pass light emitted by the light source (100) except the first light (720).

8. The detection device of claim 7, wherein, The blocking piece (500) is in sliding connection with the support piece (620), and the blocking piece (500) can slide relative to the support piece (620) in a direction perpendicular to the axis of the cavity (610).

9. The detection device of claim 7, wherein, The support piece (620) is in sliding connection with the cavity (610), and the support piece (620) can slide relative to the cavity (610) in the axial direction of the cavity (610).

10. The detection device of claim 7, wherein, The light-blocking area of the blocking piece (500) is variable.

11. The detection device of claim 10, wherein, The blocking piece (500) comprises at least three fan-shaped pieces (510), each of which is in movable connection with the support piece (620), and at least part of each of the fan-shaped pieces (510) can overlap each other.

12. A detection system characterized by, The detection device is in communication connection with the spectrometer.

13. A method of removing specular reflections from a detection device, characterized by, The detection device is applied to any one of claims 1-11, and comprises: According to the received light of the detector (200), the path of the first light (720) emitted by the light source (100) corresponding to the mirror-reflected light of the detection window piece (300) is calculated; The blocking piece (500) and the detector (200) are located on the same side of the detection window piece (300), and the blocking piece (500) is arranged on the path of the first light (720) to block the first light (720).

14. The method of removing specular reflections from a detection device of claim 13, wherein, In the case where the detection device comprises at least two detectors (200), the method comprises: According to the received light of each detector (200), the path of each first light (720) corresponding to the mirror-reflected light of the detection window piece (300) reflected to each detector (200) is calculated; According to the path of each first light (720), the covered position of each first light (720) is calculated and determined; The blocking piece (500) is arranged at the covered position.

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