Performance Detection System, Method and Device for Diffractive Optical Element

Abstract

The present application provides a performance detection system, method and device for a diffractive optical element. The system includes: a light emitting device for emitting predetermined light into the diffractive optical element; a receiving device including a receiving screen located on one side of the light emitting device, and a plurality of light spots are formed on the receiving screen after the predetermined light is diffracted by the diffractive optical element; an image processing device located on the side of the receiving screen away from the light emitting device, and the image processing device is configured to acquire images of the plurality of light spots on the receiving screen and calculate at least one of the diffraction efficiency, diffraction uniformity and field of view angle of the diffractive optical element according to the images. The system calculates at least one performance parameter of the diffractive optical element according to the acquired images, thereby realizing the detection of the performance of the diffractive optical element.

Description

Technical Field

[0001] The present application relates to the field of optical imaging, and more particularly, to a performance detection system, method, and device for a diffractive optical element. Background Art

[0002] The development of optical lenses has always been an important part of technological innovation. Smartphones have experienced the 2D era dominated by pixels and photosensitivity and are gradually moving towards the 3D imaging era that realizes pixel depth of field superposition and records three-dimensional information.

[0003] Currently, the mainstream mobile phones have been using the improvement of pixels and camera performance as the main indicators to attract customers. However, the imaging principle still adopts the traditional two-dimensional imaging mode, that is, mapping the image information of the real three-dimensional world onto a two-dimensional CMOS photosensitive element to achieve imaging, losing data such as the size and distance in reality, and only being able to achieve feature recognition of planar images. While 3D imaging can identify the coordinate information of each point in space, and through computer 3D data analysis, restore the complete three-dimensional world and achieve various intelligent positioning.

[0004] Currently, the mainstream 3D technologies include structured light, TOF, and binocular ranging. Structured light, as the name implies, is a special structure of light. When such structured light is projected onto the object to be measured, the formed image will be distorted, that is, a distorted image is formed. Through the distorted image, the surface shape (i.e., depth) of the object to be measured can be judged, and these distorted images are obtained by diffraction through our diffractive optical element (Diffractive Optical Elements, abbreviated as DOE). The performance of the DOE will affect the formation of the distorted image. Therefore, it is crucial to monitor the performance of the DOE. However, no corresponding detection device has been invented yet.

[0005] The above information disclosed in the background art section is only used to enhance the understanding of the background art of the technology described in this article. Therefore, the background art may contain certain information that is not prior art known to those skilled in the art in this country. Summary of the Invention

[0006] The main purpose of the present application is to provide a performance detection system, method, and device for a diffractive optical element to solve the problem that the diffractive optical element cannot be detected in the prior art.

[0007] To achieve the above object, according to one aspect of the present application, there is provided a performance detection system for a diffractive optical element, including: a light emitting device for emitting a predetermined light into the diffractive optical element; a receiving device including a receiving screen located on one side of the light emitting device, and a plurality of light spots are formed on the receiving screen after the predetermined light is diffracted by the diffractive optical element; an image processing device located on the side of the receiving screen away from the light emitting device, and the image processing device is used to acquire an image of the plurality of light spots on the receiving screen and calculate at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element according to the image.

[0008] Further, the system further includes: a first driving device for driving the diffractive optical element to move on a horizontal plane.

[0009] Further, the first driving device includes: a first driving component for driving the diffractive optical element to move in a first direction; a second driving component connected to the first driving component, and the second driving component is used to drive the first driving component to move in a second direction, and the second direction is perpendicular to the first direction.

[0010] Further, the second driving component includes: a driving platform connected to the first driving component; a second driving shaft connected to the driving platform; an installation platform connected to the second driving shaft, and the installation platform has an installation portion for installing the diffractive optical element.

[0011] Further, a plurality of the diffractive optical elements can be installed in the installation portion.

[0012] Further, the system further includes a positioning device for acquiring the position of the diffractive optical element, and the positioning device includes: a first camera including a first lens, and the first camera is used to photograph the diffractive optical element to acquire the position of the diffractive optical element; a third driving component connected to the first camera, and the third driving component is used to drive the first camera to move.

[0013] Further, the positioning device further includes: an optical element connected to the first lens; a light source connected to the optical element.

[0014] Further, the light emitting device is a laser emitting device, and the laser emitting device includes: a laser generator for emitting a laser with a predetermined wavelength; a fourth driving component connected to the laser generator, and the fourth driving component is used to at least drive the laser generator to move to change the distance between the laser generator and the diffractive optical element.

[0015] Further, the fourth driving component described above includes: a first driving member connected to the laser generator, the first driving member being configured to drive the laser generator to move in a third direction to change the distance between the laser generator and the diffractive optical element; a second driving member connected to the first driving member, the second driving member being configured to drive the laser generator to move in a fourth direction, the third direction being perpendicular to the fourth direction.

[0016] Further, the first driving member includes: a manual driving member connected to the laser generator; an electric driving member connected to the manual driving member.

[0017] Further, the receiving device described above further includes: a fifth driving component connected to the receiving screen, the fifth driving component being configured to drive the receiving screen to move to change the distance between the receiving screen and the diffractive optical element.

[0018] Further, the fifth driving component includes: at least two lead screws; lead screw nuts sleeved on each of the lead screws, each of the lead screw nuts being connected to the receiving screen; a synchronous belt sleeved on one end of each of the lead screws; a driving motor connected to the synchronous belt.

[0019] Further, the fifth driving component further includes: a slide rail; a sliding member, one end of the sliding member being slidably disposed on the slide rail, the other end of the sliding member being connected to the receiving screen.

[0020] Further, the image processing device includes: a second camera including a second lens; a sixth driving component configured to drive the second camera to move to change the distance between the second camera and the receiving screen.

[0021] Further, the sixth driving component includes: a guide rail; a support member movably disposed on the guide rail, the second camera being mounted on the support member.

[0022] According to another aspect of the present application, there is provided a method for detecting the performance of a diffractive optical element, including: controlling a light emitting device to emit a predetermined light to the diffractive optical element, the diffractive optical element diffracting the predetermined light to form a plurality of light spots on a receiving screen; acquiring images of the plurality of light spots, and calculating at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element based on the images.

[0023] Further, the images are acquired through a lens, and the method further includes: adjusting the distance between the lens and the receiving screen, and / or adjusting the focal length of the lens, so that the gray value at the center position of the image is the largest on the receiving screen.

[0024] Further, calculating at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the above-mentioned diffractive optical element based on the above-mentioned image includes: obtaining the gray-scale values and coordinate values of each of the above-mentioned light spots from the above-mentioned image; calculating the diffraction efficiency, the diffraction uniformity, and the field of view angle based on the gray-scale values and the coordinate values of each of the above-mentioned light spots.

[0025] Further, calculating the diffraction efficiency based on the gray-scale values and the coordinate values of each of the above-mentioned light spots includes: calculating the light intensity corresponding to each of the above-mentioned light spots according to the gray-scale values of each of the above-mentioned light spots; calculating the diffraction efficiency based on the light intensity corresponding to each of the above-mentioned light spots and the light intensity of the above-mentioned predetermined light. Calculating the diffraction uniformity based on the gray-scale values and the coordinate values of each of the above-mentioned light spots includes: calculating the first light intensity corresponding to the light spot with the maximum gray-scale value; calculating the second light intensity corresponding to the light spot with the minimum gray-scale value; calculating the diffraction uniformity based on the first light intensity and the second light intensity. Calculating the field of view angle based on the gray-scale values and the coordinate values of each of the above-mentioned light spots includes: obtaining the maximum value among the distances between the light spot located at the center of the image and other above-mentioned light spots to obtain a first distance; obtaining a second distance between the above-mentioned diffractive optical element and the above-mentioned receiving screen; calculating the quotient of the first distance and the second distance to obtain the field of view angle.

[0026] Further, calculating the diffraction uniformity based on the first light intensity and the second light intensity includes: calculating the sum of the first light intensity and the second light intensity to obtain the sum of light intensities; calculating the difference between the first light intensity and the second light intensity to obtain the difference of light intensities; calculating the quotient of the difference of light intensities and the sum of light intensities to obtain the diffraction uniformity.

[0027] Further, photographing an image of a plurality of light spots formed on a receiving screen after diffraction of the above-mentioned predetermined light includes: photographing an image of a plurality of light spots formed on a plurality of the above-mentioned receiving screens after diffraction of the above-mentioned predetermined light, where the distances between the plurality of the above-mentioned receiving screens and the above-mentioned diffractive optical element are different. Calculating at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the above-mentioned diffractive optical element based on the above-mentioned image includes: calculating at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the above-mentioned diffractive optical element based on each of the above-mentioned images to obtain a plurality of the above-mentioned diffraction efficiencies, a plurality of the above-mentioned diffraction uniformities, and / or a plurality of the above-mentioned field of view angles. The above method further includes: comparing the plurality of the above-mentioned diffraction efficiencies, the plurality of the above-mentioned diffraction uniformities, and / or the plurality of the above-mentioned field of view angles; determining the optimal imaging position of the above-mentioned diffractive optical element according to the comparison result.

[0028] Further, the above-mentioned predetermined light is a laser with a predetermined wavelength, and the plurality of the above-mentioned light spots form a square matrix.

[0029] According to another aspect of the present application, there is provided a performance detection device for a diffractive optical element, including: an acquisition unit configured to acquire an image of a plurality of light spots formed after a predetermined light is diffracted by the diffractive optical element; a calculation unit configured to calculate at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element based on the above image.

[0030] Applying the technical solution of the present application, in the performance detection system of the diffractive optical element, a light emitting device emits a predetermined light into the diffractive optical element, a receiving screen of a receiving device receives a plurality of light spots formed after the predetermined light is diffracted by the diffractive optical element, an image processing device acquires an image of the plurality of light spots on the receiving screen, and calculates at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element based on the above image. The system calculates at least one performance parameter of the diffractive optical element according to the acquired image, thereby realizing the detection of the performance of the diffractive optical element. Brief Description of the Drawings

[0031] The accompanying drawings forming a part of this application are used to provide a further understanding of the present application. The schematic embodiments and descriptions thereof of the present application are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0032] Figure 1 and Figure 2 shows a schematic structural diagram of the performance detection system of the diffractive optical element of the present application;

[0033] Figure 3 shows Figure 2 a schematic structural diagram of the first driving device in;

[0034] Figure 4 shows Figure 2 a schematic structural diagram of the positioning device in;

[0035] Figure 5 shows Figure 2 a schematic structural diagram of the light emitting device in;

[0036] Figure 6 shows Figure 2 a schematic structural diagram of the receiving device in;

[0037] Figure 7 shows Figure 2 a schematic structural diagram of the image processing device in;

[0038] Figure 8 shows a schematic structural diagram of the housing of the performance detection system of the diffractive optical element of the present application;

[0039] Figure 9The flowchart shows an embodiment of a method for detecting the performance of a diffractive optical element according to the present application; and

[0040] Figure 10 The structural diagram shows an embodiment of a device for detecting the performance of a diffractive optical element according to the present application.

[0041] Among them, the above-mentioned drawings include the following reference numerals:

[0042] 1, Image processing device; 2, Receiving device; 3, First driving device; 4, Light emitting device; 5, Positioning device; 6, Frame; 11, Second camera; 12, Second lens; 13, Support; 14, Guide rail; 21, Receiving screen; 22, Slide rail; 23, Lead screw; 24, Motor; 25, Timing belt; 26, Lead screw nut; 27, Sliding member; 31, First driving assembly; 32, Second driving shaft; 33, Driving platform; 34, Mounting platform; 35, Mounting part; 41, Laser generator; 42, Manual driving member; 43, Electric driving member; 44, Second driving member; 51, First camera; 52, First lens; 53, Optical element; 54, Light source; 55, Third driving assembly. Detailed implementation manners

[0043] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0044] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

[0045] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to describe the embodiments of the present application here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0046] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element can be directly on the other element, or there can also be an intermediate element. Moreover, in the specification and claims, when an element is described as being "connected" to another element, the element can be "directly connected" to the other element, or "connected" to the other element through a third element.

[0047] As described in the background art, it is impossible to detect diffractive optical elements in the prior art. To solve this problem, according to the first embodiment of the present application, a performance detection system for diffractive optical elements is provided.

[0048] Figure 1 and Figure 2 are schematic structural diagrams of a performance detection system for diffractive optical elements according to the first embodiment of the present application. As Figure 1 and Figure 2 shown ( Figure 1 the light emitting device 4 is not shown in

[0049] a light emitting device 4, the above-mentioned light emitting device 4 is used to emit predetermined light into the above-mentioned diffractive optical element;

[0050] a receiving device 2, including a receiving screen, the above-mentioned receiving screen is located on one side of the above-mentioned light emitting device 4, and multiple light spots are formed on the above-mentioned receiving screen after the above-mentioned predetermined light is diffracted by the above-mentioned diffractive optical element;

[0051] an image processing device 1, located on the side of the above-mentioned receiving screen away from the above-mentioned light emitting device 4, the above-mentioned image processing device 1 is used to acquire images of multiple light spots on the above-mentioned receiving screen, and calculate at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the above-mentioned diffractive optical element according to the above-mentioned images.

[0052] In the above-mentioned performance detection system for diffractive optical elements, the light emitting device emits predetermined light into the diffractive optical element, the receiving screen of the receiving device receives multiple light spots formed after the predetermined light is diffracted by the diffractive optical element, the image processing device acquires images of multiple light spots on the receiving screen, and calculates at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the above-mentioned diffractive optical element according to the above-mentioned images. This system calculates at least one performance parameter of the diffractive optical element according to the acquired images, thereby realizing the detection of the performance of the diffractive optical element.

[0053] In the actual application process, generally speaking, there are multiple diffractive optical elements to be detected. In order to move the next DOE to be detected to a predetermined position in the horizontal plane, in the second embodiment of the present application, as Figure 1 and Figure 2As shown, the above system further includes a first driving device 3, and the first driving device 3 is used to drive the diffractive optical element to move on a horizontal plane. The first driving device moves the diffractive optical element on the horizontal plane to achieve precise positioning of the diffractive optical element to be detected.

[0054] In order to enable the diffractive optical element to move to any position on the horizontal plane to determine the position where the diffractive imaging effect of the diffractive optical element reaches the best, in the third embodiment of the present application, the first driving device includes a first driving component and a second driving component. Among them, the first driving component is used to drive the diffractive optical element to move along a first direction; the second driving component is connected to the first driving component, and the second driving component is used to drive the first driving component to move along a second direction, the second direction is perpendicular to the first direction, and both the second direction and the first direction are parallel to the horizontal plane.

[0055] In the fourth embodiment of the present application, as Figure 3 shown, the second driving component includes a driving platform 33, a second driving shaft 32 and a mounting platform 34. Among them, the driving platform 33 is connected to the first driving component 31; the second driving shaft 32 is connected to the driving platform 33; the mounting platform 34 is connected to the second driving shaft 32, and the mounting platform 34 has a mounting portion 35, and the mounting portion 35 is used to mount the diffractive optical element.

[0056] Of course, the second driving component of the present application is not limited to the above Figure 3 structure, and can also be any other feasible structure, and those skilled in the art can select a suitable structure as the second driving component according to the actual situation.

[0057] Specifically, the first driving component drives the driving platform to move along the first direction, drives the diffractive optical element to move along the first direction, and the second driving shaft drives the mounting platform to move along the second direction, drives the diffractive optical element to move along the second direction, so as to realize the first driving device driving the diffractive optical element to move on the horizontal plane.

[0058] In the fifth embodiment of the present application, the mounting portion can mount a plurality of the diffractive optical elements. In the performance detection system of the diffractive optical element, multiple diffractive optical elements are simultaneously subjected to performance detection, which can greatly improve the detection efficiency and reduce the detection cost.

[0059] In order to determine the position of the above diffractive optical element and ensure that the diffractive optical element is located at a predetermined position, in the sixth embodiment of the present application, as Figure 1 and Figure 2 shown, the above system further includes a positioning device 5, and the positioning device 5 is used to obtain the position of the diffractive optical element, as Figure 4As shown, the above positioning device 5 includes a first camera 51 and a third driving component 55. Among them, the first camera 51 includes a first lens 52. The first camera 51 is used to photograph the diffractive optical element to obtain the position of the diffractive optical element. The third driving component 55 is connected to the first camera 51, and the third driving component 55 is used to drive the first camera 51 to move.

[0060] Specifically, the third driving component drives the first camera to move so that the lens of the first camera captures the diffractive optical element to be detected. Furthermore, the first camera photographs the diffractive optical element to be detected to obtain the position of the diffractive optical element. If the diffractive optical element is not within the field of view of the first camera, the first driving device drives the diffractive optical element to continue moving on the horizontal plane until the diffractive optical element is located at a predetermined position.

[0061] In the seventh embodiment of the present application, as Figure 4 shown, the above positioning device further includes an optical element 53 and a light source 54. Among them, the optical element 53 is connected to the first lens 52; the light source 54 is connected to the optical element 53. The optical element 53 and the light source 54 cooperate with the first lens for photographing to improve the photographing quality, thereby improving the accuracy of the DOE positioning to be detected.

[0062] In the eighth embodiment of the present application, the above light emitting device is a laser emitting device. The laser emitting device includes a laser generator and a fourth driving component. Among them, the laser generator is used to emit laser light of a predetermined wavelength. The fourth driving component is connected to the laser generator, and the fourth driving component is used to at least drive the laser generator to move to change the distance between the laser generator and the diffractive optical element. The laser light emitted by the laser generator with a predetermined wavelength is the predetermined light.

[0063] In the ninth embodiment of the present application, as Figure 5 shown, the above fourth driving component includes a first driving member and a second driving member 44. Among them, the first driving member is connected to the laser generator 41, and the first driving member is used to drive the laser generator 41 to move in the third direction to change the distance between the laser generator 41 and the diffractive optical element. The second driving member 44 is connected to the first driving member, and the second driving member 44 is used to drive the laser generator 41 to move in the fourth direction. The third direction is perpendicular to the fourth direction, and the fourth direction is parallel to the horizontal plane.

[0064] In the tenth embodiment of the present application, as Figure 5As shown in the figure, the first driving member includes a manual driving member 42 and an electric driving member 43. Among them, the manual driving member 42 is connected to the laser generator 41; the electric driving member 43 is connected to the manual driving member 42. The first driving member is used to adjust the distance between the laser generator and the diffractive optical element. The electric driving member is used for coarse adjustment, and the manual driving member is used for fine adjustment, so as to improve the control accuracy and further optimize the diffractive imaging effect of the diffractive optical element.

[0065] Of course, the first driving member of the present application is not limited to the above structure, and can also be other realizable structures. Those skilled in the art can select a suitable structure according to the actual situation to form the first driving member.

[0066] In the eleventh embodiment of the present application, the receiving device further includes a fifth driving assembly, and the fifth driving assembly is connected to the receiving screen. The fifth driving assembly is used to drive the receiving screen to move to change the distance between the receiving screen and the diffractive optical element.

[0067] It should be noted that the distance between the receiving screen and the diffractive optical element will also affect the diffractive imaging effect of the diffractive optical element. Therefore, it is necessary to drive the receiving screen to move by the fifth driving assembly to change the distance between the receiving screen and the diffractive optical element, so as to comprehensively obtain the performance of the DOE.

[0068] In the twelfth embodiment of the present application, as Figure 6 shown, the fifth driving assembly includes at least two lead screws 23, lead screw nuts 26, a synchronous belt 25, and a driving motor 24. Among them, the lead screw nuts 26 are sleeved on each of the lead screws 23, and each of the lead screw nuts 26 is connected to the receiving screen 21; the synchronous belt 25 is sleeved on one end of each of the lead screws 23; the driving motor 24 is connected to the synchronous belt 25. Specifically, the driving motor drives the synchronous belt to move, the synchronous belt drives the lead screw to move along its axial direction, and the lead screw drives the receiving screen to move in the vertical direction through the lead screw nut, so as to change the distance between the receiving screen and the diffractive optical element.

[0069] In order to make the receiving screen move more smoothly, in the thirteenth embodiment of the present application, as Figure 6 shown, the fifth driving assembly further includes a slide rail 22 and a sliding member 27. Among them, one end of the sliding member 27 is slidably arranged on the slide rail 22, and the other end of the sliding member 27 is connected to the receiving screen 21.

[0070] In the fourteenth embodiment of the present application, as Figure 7 shown, the image processing device 1 includes a second camera 11 and a sixth driving assembly. Among them, the second camera 11 includes a second lens 12; the sixth driving assembly is used to drive the second camera 11 to move to change the distance between the second camera 11 and the receiving screen.

[0071] In the fifteenth embodiment of the present application, as Figure 7 shown, the sixth driving component includes a guide rail 14 and a support member 13. Among them, the support member 13 is movably arranged on the guide rail 14, and the second camera 11 is mounted on the support member 13.

[0072] Specifically, the sixth driving component drives the second camera to move along the guide rail through the support member, adjusts the distance between the second camera and the receiving screen, so that the second lens can capture a clear image of the light spots, so as to calculate at least one of the diffraction efficiency, diffraction uniformity and field of view angle of the diffraction optical element according to the above image.

[0073] In the sixteenth embodiment of the present application, as Figure 8 shown, the above system further includes a housing 6. The housing 6 includes a first surface and a second surface arranged opposite to each other. The first driving device is located on the first surface, the lead screw is fixed on the first surface, and the guide rail is fixed on the first surface.

[0074] Figure 9 is a schematic flowchart of the seventeenth embodiment of the method for detecting the performance of a diffraction optical element according to the present application. As Figure 9 shown, the method includes the following steps:

[0075] Step S101, controlling a light emitting device to emit a predetermined light to the diffraction optical element, and the diffraction optical element diffracts the predetermined light to form a plurality of light spots on the receiving screen;

[0076] Step S102, acquiring images of the plurality of light spots;

[0077] Step S103, calculating at least one of the diffraction efficiency, diffraction uniformity and field of view angle of the diffraction optical element according to the above image.

[0078] In the method for detecting the performance of the diffraction optical element, first, a light emitting device is controlled to emit a predetermined light to the diffraction optical element, and the diffraction optical element diffracts the predetermined light to form a plurality of light spots on the receiving screen; then, images of the plurality of light spots are acquired; finally, at least one of the diffraction efficiency, diffraction uniformity and field of view angle of the diffraction optical element is calculated according to the above image. This method uses the acquired images to calculate the performance parameters of the diffraction optical element to realize the detection of the performance of the diffraction optical element, and solves the problem that the diffraction optical element cannot be detected in the prior art.

[0079] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. And although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0080] In the eighteenth embodiment of the present application, the above image is obtained through a lens. The above method further includes: adjusting the distance between the above lens and the above receiving screen, and / or adjusting the focal length of the above lens, so that the gray value at the center position of the above image is the largest on the receiving screen. This method can obtain an image with the best imaging effect, and subsequently calculate the best performance of the diffractive optical element based on the image with the best imaging effect.

[0081] During the actual shooting process where the gray value at the center position is the largest on the lens receiving screen, adjust the distance between the lens and the receiving screen and / or the focal length of the lens to make the gray value at the center position of the captured image reach the maximum. At this time, the diffractive imaging effect of the diffractive optical element reaches the best, and subsequently, the best performance of the diffractive optical element can be calculated based on this image. In fact, it is possible to only adjust the distance between the lens and the receiving screen, or only adjust the focal length of the lens, or adjust both the distance between the lens and the receiving screen and the focal length of the lens simultaneously.

[0082] In order to obtain the three performances of the diffractive optical element, namely the diffraction efficiency, diffraction uniformity, and field of view angle, in the nineteenth embodiment of the present application, calculating at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element based on the above image includes: obtaining the gray value and coordinate value of each of the above light spots based on the above image; calculating the diffraction efficiency, the diffraction uniformity, and the field of view angle based on the gray value and the coordinate value of each of the above light spots. Among them, the diffraction efficiency and diffraction uniformity are calculated based on the gray value of the light spots, and the field of view angle is calculated based on the coordinate value of the light spots.

[0083] In the twentieth embodiment of the present application, calculating the diffraction efficiency based on the gray value and the coordinate value of each of the above light spots includes: calculating the light intensity corresponding to each of the above light spots based on the gray value of each of the above light spots; calculating the diffraction efficiency based on the light intensity corresponding to each of the above light spots and the light intensity of the above predetermined light. Specifically, the formula is as follows: That is, the diffraction efficiency is equal to the ratio of the total light intensity corresponding to all light spots to the light intensity of the predetermined light. The smaller this ratio is, the lower the diffraction efficiency of the diffractive optical element, and the worse the performance of the diffractive optical element. The larger this ratio is, the higher the diffraction efficiency of the diffractive optical element, and the better the performance of the diffractive optical element. Among them, the total light intensity is the sum of the light intensities of all light spots, and the light intensity corresponding to a light spot can be obtained by converting the gray value of the light spot. For example, the gray value of the pixel point can be directly read.

[0084] In the twentieth embodiment of the present application, calculating the diffraction uniformity according to the gray-scale value and the coordinate value of each of the above light spots includes: calculating a first light intensity corresponding to the light spot with the maximum gray-scale value; calculating a second light intensity corresponding to the light spot with the minimum gray-scale value; calculating the diffraction uniformity according to the first light intensity and the second light intensity. Among them, the first light intensity can be obtained by converting the gray-scale value of the light spot with the maximum gray-scale value, and the second light intensity can be obtained by converting the gray-scale value of the light spot with the minimum gray-scale value. The specific conversion method can refer to the content in the previous paragraph.

[0085] In the twentieth embodiment of the present application, calculating the field of view angle according to the gray-scale value and the coordinate value of each of the above light spots further includes: obtaining a maximum value among the distances between the light spot located at the center of the image and the other above light spots to obtain a first distance; obtaining a second distance between the diffractive optical element and the receiving screen; calculating a quotient of the first distance and the second distance to obtain the field of view angle. Specifically, the formula is as follows: That is, the field of view angle is equal to the ratio of the first distance to the second distance. The larger the ratio, the better the performance of the diffractive optical element, and the larger the field of view angle of the diffractive optical element. The smaller the ratio, the smaller the field of view angle of the diffractive optical element, and the worse the performance of the diffractive optical element.

[0086] In the twenty-first embodiment of the present application, calculating the diffraction uniformity according to the first light intensity and the second light intensity includes: calculating a sum of the first light intensity and the second light intensity to obtain a light intensity sum; calculating a difference between the first light intensity and the second light intensity to obtain a light intensity difference; calculating a quotient of the light intensity difference and the light intensity sum to obtain the diffraction uniformity. Specifically, the formula is as follows: That is, the diffraction uniformity is equal to the ratio of the sum of the first light intensity and the second light intensity to the difference between the first light intensity and the second light intensity. The smaller the ratio, the better the diffraction uniformity of the diffractive optical element, and the better the performance of the diffractive optical element. The larger the ratio, the worse the diffraction uniformity of the diffractive optical element, and the worse the performance of the diffractive optical element.

[0087] In order to obtain the performance of the diffractive optical element at multiple imaging distances, and further obtain the optimal imaging distance, so as to improve the comprehensiveness of performance detection. In the twenty-second embodiment of the present application, photographing the images of multiple light spots formed on the receiving screen after the above-mentioned predetermined light is diffracted includes: photographing the images of multiple light spots formed on multiple above-mentioned receiving screens after the above-mentioned predetermined light is diffracted, and the distances between the multiple above-mentioned receiving screens and the above-mentioned diffractive optical element are different. Calculating at least one of the diffraction efficiency, diffraction uniformity and field of view angle of the above-mentioned diffractive optical element based on the above-mentioned images includes: calculating at least one of the diffraction efficiency, diffraction uniformity and field of view angle of the above-mentioned diffractive optical element based on each of the above-mentioned images, obtaining multiple above-mentioned diffraction efficiencies, multiple above-mentioned diffraction uniformities and / or multiple above-mentioned field of view angles. The above-mentioned method further includes: comparing the multiple above-mentioned diffraction efficiencies, multiple above-mentioned diffraction uniformities and / or multiple above-mentioned field of view angles; determining the optimal imaging position of the above-mentioned diffractive optical element according to the comparison result. In the specific detection process, the above-mentioned comparison process is the process of obtaining the optimal imaging position.

[0088] In the twenty-third embodiment of the present application, the above-mentioned predetermined light is a laser with a predetermined wavelength, and multiple above-mentioned light spots form a square matrix. The wavelength of the predetermined light can be selected according to the actual situation. The formation of a square matrix of light spots facilitates obtaining the coordinate values of the light spots and improves the efficiency of performance detection.

[0089] Sometimes, the diffractive optical element is not located at the predetermined detection position, especially in the case of multiple diffractive optical elements to be detected. In order to make the diffractive optical element to be detected located at the predetermined detection position, and thus ensure the accuracy of detection. In the twenty-fourth embodiment of the present application, the above-mentioned method further includes: obtaining the position information of the diffractive optical element; adjusting the position of the above-mentioned diffractive optical element according to the above-mentioned position information so that the above-mentioned diffractive optical element is located at the predetermined detection position.

[0090] The twenty-fifth embodiment of the present application also provides a performance detection device for a diffractive optical element. It should be noted that the performance detection device for a diffractive optical element in the embodiments of the present application can be used to execute the performance detection method for a diffractive optical element provided in the embodiments of the present application. The following introduces the performance detection device for a diffractive optical element provided in the embodiments of the present application.

[0091] Figure 10 It is a schematic diagram of a performance detection device for a diffractive optical element according to the twenty-sixth embodiment of the present application. As Figure 10 shown, the device includes:

[0092] A first control unit 10, configured to control a light emitting device to emit predetermined light to a diffractive optical element, and the above-mentioned diffractive optical element diffracts the above-mentioned predetermined light to form multiple light spots on a receiving screen;

[0093] An acquisition unit 20, configured to acquire images of a plurality of the above-mentioned light spots;

[0094] A calculation unit 30, configured to calculate at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the above-mentioned diffractive optical element according to the above-mentioned images.

[0095] In the performance detection device of the above-mentioned diffractive optical element, a first control unit controls a light emitting device to emit a predetermined light to the diffractive optical element, the above-mentioned diffractive optical element diffracts the above-mentioned predetermined light, and a plurality of light spots are formed on a receiving screen; the acquisition unit acquires images of the plurality of light spots, and the calculation unit calculates at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the above-mentioned diffractive optical element according to the above-mentioned images. This device calculates the performance parameters of the diffractive optical element by using the acquired images to achieve the detection of the performance of the diffractive optical element, and solves the problem that the diffractive optical element cannot be detected in the prior art.

[0096] In the twenty-seventh embodiment of the present application, the above-mentioned acquisition unit includes a photographing module, and the photographing module is configured to photograph images of a plurality of light spots formed on the receiving screen after the above-mentioned predetermined light is diffracted. The above-mentioned device further includes a second control unit, and the second control unit is configured to adjust the distance between the lens and the above-mentioned receiving screen; and / or adjust the focal length of the lens used for photographing. During the actual photographing process, the distance between the lens and the receiving screen and / or the focal length of the lens are adjusted to make the gray value at the center position of the photographed image reach the maximum. At this time, the diffraction imaging effect of the diffractive optical element reaches the best, and the best performance of the diffractive optical element can be calculated according to this image subsequently. In fact, the distance between the lens and the receiving screen can be adjusted only, the focal length of the lens can be adjusted only, or the distance between the lens and the receiving screen and the focal length of the lens can be adjusted simultaneously.

[0097] In order to obtain an image with the maximum gray value at the center position and make the diffraction imaging effect of the diffractive optical element reach the best, in the twenty-eighth embodiment of the present application,

[0098] In order to obtain the three performance indicators of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element, in the twenty-ninth embodiment of the present application, the calculation unit includes an acquisition module and a calculation module. Among them, the acquisition module is used to obtain the gray-scale values and coordinate values of each of the above-mentioned light spots according to the above-mentioned image; the calculation module is used to calculate the above-mentioned diffraction efficiency, the above-mentioned diffraction uniformity, and the above-mentioned field of view angle according to the above-mentioned gray-scale values and the above-mentioned coordinate values of each of the above-mentioned light spots. Among them, the diffraction efficiency and diffraction uniformity are calculated through the gray-scale values of the light spots, and the field of view angle is calculated through the coordinate values of the light spots. Among them, the calculation module includes a first calculation sub-module, a second calculation sub-module, and a third calculation sub-module. The first calculation sub-module calculates the above-mentioned diffraction efficiency according to the above-mentioned gray-scale values and the above-mentioned coordinate values of each of the above-mentioned light spots. Specifically, first, according to the above-mentioned gray-scale values of each of the above-mentioned light spots, the light intensity corresponding to each of the above-mentioned light spots is calculated; then, according to the light intensity corresponding to each of the above-mentioned light spots and the light intensity of the above-mentioned predetermined light, the above-mentioned diffraction efficiency is calculated. Specifically, the formula is as follows: That is, the diffraction efficiency is equal to the ratio of the total light intensity corresponding to all light spots to the light intensity of the predetermined light. The smaller this ratio is, the lower the diffraction efficiency of the diffractive optical element, and the worse the performance of the diffractive optical element. The larger this ratio is, the higher the diffraction efficiency of the diffractive optical element, and the better the performance of the diffractive optical element. Among them, the total light intensity is the sum of the light intensities of all light spots, and the light intensity corresponding to a light spot can be obtained by converting the gray-scale value of the light spot. For example, the gray-scale value of the pixel point can be directly read.

[0099] The second calculation sub-module calculates the above-mentioned diffraction uniformity according to the above-mentioned gray-scale values and the above-mentioned coordinate values of each of the above-mentioned light spots. Specifically, this sub-module calculates the first light intensity corresponding to the light spot with the maximum gray-scale value; calculates the second light intensity corresponding to the light spot with the minimum gray-scale value; calculates the above-mentioned diffraction uniformity according to the above-mentioned first light intensity and the above-mentioned second light intensity. Among them, the first light intensity can be obtained by converting the gray-scale value of the light spot with the maximum gray-scale value, and the second light intensity can be obtained by converting the gray-scale value of the light spot with the minimum gray-scale value. The specific conversion method can refer to the above content.

[0100] The third calculation sub-module calculates the above-mentioned field of view angle according to the above-mentioned gray-scale values and the above-mentioned coordinate values of each of the above-mentioned light spots. Specifically, this sub-module obtains the maximum value among the distances between the light spot located at the center of the image and the other above-mentioned light spots to obtain the first distance; obtains the second distance between the above-mentioned diffractive optical element and the above-mentioned receiving screen; calculates the quotient of the above-mentioned first distance and the above-mentioned second distance to obtain the above-mentioned field of view angle. Specifically, the formula is as follows: That is, the field of view angle is equal to the ratio of the first distance to the second distance. The larger this ratio is, the better the performance of the diffractive optical element, and the larger the field of view angle of the diffractive optical element. The smaller this ratio is, the smaller the field of view angle of the diffractive optical element, and the worse the performance of the diffractive optical element.

[0101] In the thirtieth embodiment of the present application, the second calculation sub-module is used to calculate the sum of the above-mentioned first light intensity and the above-mentioned second light intensity to obtain the light intensity sum; it also calculates the difference between the above-mentioned first light intensity and the above-mentioned second light intensity to obtain the light intensity difference; finally, it calculates the quotient of the above-mentioned light intensity difference and the above-mentioned light intensity sum to obtain the above-mentioned diffraction uniformity. Specifically, the formula is as follows: That is, the diffraction uniformity is equal to the ratio of the sum of the first light intensity and the second light intensity to the difference between the first light intensity and the second light intensity. The smaller this ratio is, the better the diffraction uniformity of the diffractive optical element, and the better the performance of the diffractive optical element. The larger this ratio is, the worse the diffraction uniformity of the diffractive optical element, and the worse the performance of the diffractive optical element.

[0102] In order to obtain the performance of the diffractive optical element at multiple imaging distances, and then obtain the optimal imaging distance, so as to improve the comprehensiveness of performance detection. In the thirty-first embodiment of the present application, the above-mentioned acquisition unit includes a shooting module. The shooting module is used to shoot images of multiple light spots formed on multiple above-mentioned receiving screens after the above-mentioned predetermined light is diffracted. The distances between the multiple above-mentioned receiving screens and the above-mentioned diffractive optical element are different. The above-mentioned calculation unit is used to calculate at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the above-mentioned diffractive optical element according to each of the above-mentioned images, to obtain multiple above-mentioned diffraction efficiencies, multiple above-mentioned diffraction uniformities, and / or multiple above-mentioned field of view angles. The device also includes a comparison unit and a determination unit. Among them, the comparison unit is used to compare the multiple above-mentioned diffraction efficiencies, multiple above-mentioned diffraction uniformities, and / or multiple above-mentioned field of view angles; the determination unit is used to determine the optimal imaging position of the above-mentioned diffractive optical element according to the comparison result. In the specific detection process, the above-mentioned comparison process is the process of obtaining the optimal imaging position.

[0103] In the thirty-second embodiment of the present application, the above-mentioned predetermined light is a laser with a predetermined wavelength, and the multiple above-mentioned light spots form a square matrix. The wavelength of the predetermined light can be selected according to the actual situation. The formation of a square matrix by the light spots is convenient for obtaining the coordinate values of the light spots and improving the efficiency of performance detection.

[0104] Sometimes, the diffractive optical element is not located at the predetermined detection position, especially in the case of multiple diffractive optical elements to be detected. In order to make the diffractive optical element to be detected located at the predetermined detection position, and then ensure the accuracy of detection. In the thirty-third embodiment of the present application, the above-mentioned device also includes a positioning unit and a first driving unit. The positioning unit uses a positioning device to obtain the position information of the diffractive optical element; the first driving unit adjusts the position of the above-mentioned diffractive optical element according to the above-mentioned position information so that the above-mentioned diffractive optical element is located at the predetermined detection position.

[0105] The performance detection device of the above diffraction optical element includes a processor and a memory. The above acquisition unit, calculation unit, etc. are all stored in the memory as program units, and the processor executes the above program units stored in the memory to implement corresponding functions.

[0106] The processor contains a kernel, and the kernel retrieves the corresponding program units from the memory. One or more kernels can be set, and the diffraction optical element is detected by adjusting the kernel parameters.

[0107] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of, for example, read-only memory (ROM) or flash RAM (flash random access memory), and the memory includes at least one memory chip.

[0108] The thirty-fourth embodiment of the present invention provides a storage medium on which a program is stored, and when the program is executed by a processor, the performance detection method of the above diffraction optical element is implemented.

[0109] The thirty-fifth embodiment of the present invention provides a processor, and the above processor is used to run a program. When the above program runs, the performance detection method of the above diffraction optical element is executed.

[0110] The thirty-sixth embodiment of the present invention provides a device. The device includes a processor, a memory, and a program stored on the memory and executable on the processor. When the processor executes the program, at least the following steps are implemented:

[0111] Step S101, obtaining an image of a plurality of light spots formed after a predetermined light is diffracted by a diffraction optical element;

[0112] Step S102, calculating at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the above diffraction optical element according to the above image.

[0113] The device in this article can be a server, a PC, a PAD, a mobile phone, etc.

[0114] The present application also provides a computer program product, which is suitable for executing a program initialized with at least the following method steps when executed on a data processing device:

[0115] Step S101, obtaining an image of a plurality of light spots formed after a predetermined light is diffracted by a diffraction optical element;

[0116] Step S102, calculating at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the above diffraction optical element according to the above image.

[0117] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0118] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0119] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0120] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0121] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and a memory.

[0122] The memory may include non-permanent memory in the form of computer-readable media, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

[0123] A computer-readable medium includes both permanent and non-permanent, removable and non-removable media and can implement information storage by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to store information accessible by a computing device. As defined herein, a computer-readable medium does not include transitory computer-readable media, such as modulated data signals and carrier waves.

[0124] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but also other elements not expressly listed, or elements that are inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0125] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, system, or computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0126] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0127] 1) In the performance detection system of the diffractive optical element of the present application, a light emitting device emits predetermined light into the diffractive optical element. The receiving screen of the receiving device receives multiple light spots formed after the diffraction of the predetermined light by the diffractive optical element. The image processing device acquires the images of the multiple light spots on the receiving screen and calculates at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element based on the above images. This system calculates at least one performance parameter of the diffractive optical element based on the acquired images, thereby realizing the detection of the performance of the diffractive optical element.

[0128] 2) In the performance detection method of the above diffractive optical element of the present application, first, control the light emitting device to emit predetermined light to the diffractive optical element. The diffractive optical element diffracts the predetermined light to form multiple light spots on the receiving screen. Then, acquire the images of the multiple light spots. Finally, calculate at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element based on the above images. This method calculates the performance parameters of the diffractive optical element by using the acquired images to realize the detection of the performance of the diffractive optical element, and solves the problem that the diffractive optical element cannot be detected in the prior art.

[0129] 3) In the performance detection device of the diffractive optical element of the present application, the first control unit controls the light emitting device to emit predetermined light to the diffractive optical element. The diffractive optical element diffracts the predetermined light to form multiple light spots on the receiving screen. The acquisition unit acquires the images of the multiple light spots, and the calculation unit calculates at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element based on the above images. This device calculates the performance parameters of the diffractive optical element by using the acquired images to realize the detection of the performance of the diffractive optical element, and solves the problem that the diffractive optical element cannot be detected in the prior art.

[0130] The foregoing are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A performance detection system for a diffractive optical element, characterized in that, it includes: a light emitting device (4) for emitting predetermined light into the diffractive optical element; a receiving device (2) including a receiving screen (21), the receiving screen (21) being located on one side of the light emitting device (4), and multiple light spots being formed on the receiving screen (21) after the predetermined light is diffracted by the diffractive optical element; an image processing device (1) located on the side of the receiving screen (21) away from the light emitting device (4), the image processing device (1) being used to acquire images of multiple light spots on the receiving screen (21) and calculate at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element according to the images, the receiving device further includes: a fifth driving component connected to the receiving screen, the fifth driving component being used to drive the receiving screen to move so as to change the distance between the receiving screen and the diffractive optical element; the fifth driving component includes: at least two lead screws (23); lead screw nuts (26) sleeved on each of the lead screws (23), each of the lead screw nuts (26) being connected to the receiving screen (21); a synchronous belt (25) sleeved on one end of each of the lead screws (23); a driving motor (24) connected to the synchronous belt (25), the light emitting device is a laser emitting device, and the laser emitting device includes: a laser generator for emitting laser light of a predetermined wavelength; a fourth driving component connected to the laser generator, the fourth driving component being used to at least drive the laser generator to move so as to change the distance between the laser generator and the diffractive optical element, the fourth driving component includes: a first driving member connected to the laser generator (41), the first driving member being used to drive the laser generator (41) to move along a third direction so as to change the distance between the laser generator (41) and the diffractive optical element; a second driving member (44) connected to the first driving member, the second driving member (44) being used to drive the laser generator (41) to move along a fourth direction, the third direction being perpendicular to the fourth direction, and the fourth direction being parallel to the horizontal plane, the first driving member includes: a manual driving member (42) connected to the laser generator (41); an electric driving member (43) connected to the manual driving member (42).

2. The system according to claim 1, characterized in that, the system further includes: a first driving device (3) for driving the diffractive optical element to move on a horizontal plane.

3. The system according to claim 2, characterized in that, the first driving device includes: a first driving component for driving the diffractive optical element to move along a first direction; a second driving component, the second driving component being connected to the first driving component, the second driving component being used to drive the first driving component to move along a second direction, the second direction being perpendicular to the first direction.

4. The system according to claim 3, wherein, the second driving component includes: a driving platform (33) connected to the first driving component (31); a second driving shaft (32) connected to the driving platform (33); a mounting platform (34) connected to the second driving shaft (32), the mounting platform (34) having a mounting portion (35) for mounting the diffractive optical element.

5. The system according to claim 4, wherein, the mounting portion (35) is capable of mounting a plurality of the diffractive optical elements.

6. The system according to claim 1, wherein, the system further includes a positioning device (5) for acquiring the position of the diffractive optical element, and the positioning device (5) includes: a first camera (51) including a first lens (52), the first camera (51) being configured to photograph the diffractive optical element to acquire the position of the diffractive optical element; a third driving component (55) connected to the first camera (51), the third driving component (55) being configured to drive the first camera (51) to move.

7. The system according to claim 6, wherein, the positioning device (5) further includes: an optical element (53) connected to the first lens (52); a light source (54) connected to the optical element (53).

8. The system according to claim 1, wherein, the image processing device (1) includes: a second camera (11) including a second lens (12); a sixth driving component configured to drive the second camera (11) to move so as to change the distance between the second camera (11) and the receiving screen (21).

9. The system according to claim 1, wherein, the fifth driving component further includes: a slide rail (22); a sliding member (27) having one end slidably disposed on the slide rail (22) and the other end connected to the receiving screen (21).

10. The system according to claim 8, wherein, the sixth driving component includes: a guide rail (14); a support member (13) movably disposed on the guide rail (14), and the second camera (11) is mounted on the support member (13).

11. The system according to claim 1, wherein, the system further includes: a housing (6), the housing (6) including a first surface and a second surface disposed opposite to each other, the first driving device is located on the first surface, the lead screw is fixed on the first surface, and the guide rail is fixed on the first surface.

12. A method for detecting the performance of a diffractive optical element, wherein, it includes: controlling a light emitting device to emit a predetermined light to the diffractive optical element, the diffractive optical element diffracts the predetermined light, and a plurality of light spots are formed on a receiving screen; acquiring images of the plurality of light spots; calculating at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element according to the images, Obtaining the image through the lens, the method further includes: Adjusting the distance between the lens and the receiving screen, and / or adjusting the focal length of the lens so that the gray value at the center position of the image is the largest. Calculating at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element according to the image includes: Obtaining the gray value and coordinate value of each light spot according to the image; Calculating the diffraction efficiency, the diffraction uniformity, and the field of view angle according to the gray value and the coordinate value of each light spot. Calculating the diffraction efficiency according to the gray value and the coordinate value of each light spot includes: Calculating the light intensity corresponding to each light spot according to the gray value of each light spot; Calculating the diffraction efficiency according to the light intensity corresponding to each light spot and the light intensity of the predetermined light. Calculating the diffraction uniformity according to the gray value and the coordinate value of each light spot includes: Calculating the first light intensity corresponding to the light spot with the maximum gray value; Calculating the second light intensity corresponding to the light spot with the minimum gray value; Calculating the diffraction uniformity according to the first light intensity and the second light intensity. Calculating the field of view angle according to the gray value and the coordinate value of each light spot includes: Obtaining the maximum value among the distances between the light spot located at the center of the image and other light spots to obtain the first distance; Obtaining the second distance between the diffractive optical element and the receiving screen; Calculating the quotient of the first distance and the second distance to obtain the field of view angle. Calculating the diffraction uniformity according to the first light intensity and the second light intensity includes: Calculating the sum of the first light intensity and the second light intensity to obtain the sum of light intensities; Calculating the difference between the first light intensity and the second light intensity to obtain the difference in light intensities; Calculating the quotient of the difference in light intensities and the sum of light intensities to obtain the diffraction uniformity.

13. The method according to claim 12, wherein, Shooting an image of a plurality of light spots formed on the receiving screen after the diffraction of the predetermined light includes: Shooting an image of a plurality of light spots formed on a plurality of receiving screens after the diffraction of the predetermined light, and the distances between the plurality of receiving screens and the diffractive optical element are different. Calculating at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element according to the image includes: Calculating at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element according to each image to obtain a plurality of the diffraction efficiencies, a plurality of the diffraction uniformities, and / or a plurality of the field of view angles. The method further includes: Comparing the plurality of diffraction efficiencies, the plurality of diffraction uniformities, and / or the plurality of field of view angles; Determining the optimal imaging position of the diffractive optical element according to the comparison result.

14. The method according to claim 12, wherein, The predetermined light is a laser with a predetermined wavelength, and a plurality of the light spots form a square matrix.

15. The method according to claim 12, wherein, The method further includes: Obtaining the position information of the diffractive optical element; Adjust the position of the diffractive optical element according to the position information so that the diffractive optical element is located at a predetermined detection position.

16. A performance detection device for a diffractive optical element, characterized in that it includes: A first control unit for controlling a light emitting device to emit predetermined light to the diffractive optical element, and the diffractive optical element diffracts the predetermined light to form a plurality of light spots on a receiving screen; An acquisition unit for acquiring images of the plurality of light spots; A calculation unit for calculating at least one of the diffraction efficiency, diffraction uniformity, and field of view angle of the diffractive optical element according to the image, The device further includes: A second control unit for adjusting the distance between the lens and the receiving screen; and / or adjusting the focal length of the lens for shooting. The calculation unit includes: An acquisition module for acquiring the gray value and coordinate value of each of the light spots according to the image; A calculation module for calculating the diffraction efficiency, the diffraction uniformity, and the field of view angle according to the gray value and the coordinate value of each of the light spots; The calculation module includes: A first calculation sub-module for calculating the diffraction efficiency according to the gray value and the coordinate value of each of the light spots; A second calculation sub-module for calculating the diffraction uniformity according to the gray value and the coordinate value of each of the light spots; A third calculation sub-module for calculating the field of view angle according to the gray value and the coordinate value of each of the light spots. The second calculation sub-module is used to calculate the sum of the first light intensity and the second light intensity to obtain the light intensity sum; the second calculation sub-module is also used to calculate the difference between the first light intensity and the second light intensity to obtain the light intensity difference; the second calculation sub-module is also used to calculate the quotient of the light intensity difference and the light intensity sum to obtain the diffraction uniformity.

17. The device according to claim 16, characterized in that The device further includes: A comparison unit for comparing a plurality of the diffraction efficiencies, a plurality of the diffraction uniformities, and / or a plurality of the field of view angles; A determination unit for determining the optimal imaging position of the diffractive optical element according to the comparison result.

18. The device according to claim 16, characterized in that The predetermined light is a laser with a predetermined wavelength, and the plurality of light spots form a square matrix.

19. The device according to claim 16, characterized in that The device further includes: A positioning unit, and the positioning unit uses a positioning device to acquire the position information of the diffractive optical element; A first driving unit, and the first driving unit adjusts the position of the diffractive optical element according to the position information so that the diffractive optical element is located at a predetermined detection position.

Images