CN111366338B - Imaging quality detection device and method of virtual image forming optical system - Google Patents
Imaging quality detection device and method of virtual image forming optical system Download PDFInfo
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- CN111366338B CN111366338B CN202010334514.6A CN202010334514A CN111366338B CN 111366338 B CN111366338 B CN 111366338B CN 202010334514 A CN202010334514 A CN 202010334514A CN 111366338 B CN111366338 B CN 111366338B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
- G01M11/0257—Testing optical properties by measuring geometrical properties or aberrations by analyzing the image formed by the object to be tested
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
- G01M11/0271—Testing optical properties by measuring geometrical properties or aberrations by using interferometric methods
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Abstract
The invention discloses an imaging quality detection device and method of a virtual image forming optical system, belonging to the field of optics, wherein the device comprises: the system comprises a display screen, a system to be detected into a virtual image, a flat lens and a receiving device; a light source on the display screen sequentially passes through the system to be detected into a virtual image, the flat lens and the receiving device; an included angle alpha between the display screen and the flat lens is 30-45 degrees, an included angle beta between the flat lens and the receiving device is 30-45 degrees, and alpha-beta is satisfied; the display screen and the system to be detected into the virtual image are used for forming a virtual image; the flat lens is used for converting the virtual image into a real image; the receiving device is used for receiving the real image. The invention can effectively detect the imaging quality of the virtual image forming optical system and provide the quantitative standard of the corresponding imaging quality.
Description
Technical Field
The invention belongs to the field of optics, and particularly relates to an imaging quality detection device and method of a virtual image forming optical system.
Background
With the development of optical technology, various simple or complex optical elements are continuously widely used in various fields. Various virtual image forming optical systems, such as an ocular lens system, VR glasses, a vision detection system and the like, are used in a large amount in life, and the optical systems are characterized in that actual light rays cannot converge at an imaging position, so that the formed virtual images cannot be received by an optical screen. And the quality of the image formed by the various visual systems depends on the performance of the optical systems contained in the visual systems. Taking the eyepiece optical system as an example, if the eyepiece optical system has certain defects due to design or processing and manufacturing, the corresponding optical performance of the system, such as resolution, chromatic aberration, magnification, distortion, etc., will be reduced to a certain extent, which will affect normal use and may cause the whole system to fail.
At present, for the detection of a virtual image optical system, corresponding imaging quality detection is mainly performed by manually and directly using screening, MTF instrument detection and other modes, however, the existing method can only perform the judgment of the imaging quality of the virtual image optical system, but cannot refine and quantify the detection standard, cannot quantitatively judge key data such as distortion, magnification, resolution and the like of the optical system, has certain defects for the establishment of imaging system indexes, and cannot provide data for convincing users.
Disclosure of Invention
Aiming at the defects and the improvement requirements of the prior art, the invention provides an imaging quality detection device and an imaging quality detection method for a virtual image forming optical system, and aims to detect key parameters such as distortion, magnification, resolution and the like of the virtual image forming optical system.
To achieve the above object, according to one aspect of the present invention, there is provided an imaging quality detection apparatus of a virtual image forming optical system, including: the system comprises a display screen, a system to be detected into a virtual image, a flat lens and a receiving device;
a light source on the display screen sequentially passes through the system to be detected into a virtual image, the flat lens and the receiving device; an included angle alpha between the display screen and the flat lens is 30-45 degrees, an included angle beta between the flat lens and the receiving device is 30-45 degrees, and alpha-beta is satisfied;
the display screen and the system to be detected into the virtual image are used for forming a virtual image;
the flat lens is used for converting the virtual image into a real image;
the receiving device is used for receiving the real image.
Further, the flat lens is a flat lens having a negative equivalent refractive index.
Further, an included angle α between the display screen and the flat lens is 30 °, and an included angle β between the flat lens and the receiving device is 30 °.
Further, the receiving device is a wavefront sensor.
Further, the receiving device is an interferometer.
In another aspect of the present invention, an imaging quality detecting method for a virtual image forming optical system is provided, where the imaging quality detecting apparatus using the virtual image forming optical system includes:
the positions of the display screen and the virtual image system to be detected are adjusted, so that a light source on the display screen passes through the virtual image system to be detected to form a virtual image;
adjusting the distance between the receiving device and the flat lens along the optical path to adjust the size of the image;
and analyzing the real image received by the receiving device to obtain key parameters of the to-be-detected virtual image system, so as to evaluate the imaging quality of the to-be-detected virtual image system.
Further, the key parameters include: magnification, distortion, resolution, chromatic aberration.
Generally, by the above technical solution conceived by the present invention, the following beneficial effects can be obtained:
(1) the invention adopts the plate lens to convert the virtual image of the object formed by the virtual image forming optical system into a receivable real image, and adopts an interferometer or a wavefront sensor to receive and analyze the image at the formed real image, and finally gives out the related evaluation of the image quality by utilizing the detectable characteristic of the real image; because the flat lens has no aberration in the conversion process, the converted real image has no external aberration, and the consistency of two times of imaging is ensured, so that the imaging detection result is more accurate.
(2) Compared with the traditional spot check mode, the detection method provided by the invention can realize batch detection and is short in time consumption; compared with the detection of the traditional MTF instrument, the detection method provided by the invention can quantify the standard, give out corresponding image quality evaluation, has convincing detection results and can provide certain guidance for the production process.
(3) The detection device provided by the invention has the advantages of simple structure, accurate result and universality.
Drawings
Fig. 1 is a schematic structural diagram of an imaging quality detection apparatus of a virtual image forming optical system according to the present invention;
the system comprises a display screen 1, a to-be-detected virtual image system 2, a flat lens 3 and a receiving device 4, wherein the display screen is used as a display screen, the to-be-detected virtual image system is used as a virtual image system, and the receiving device 4 is used as a receiving device;
fig. 2-1 to 2-5 are imaging effect diagrams when the included angle α provided by the present invention is 10 °, 30 °, 50 °, 70 °, 90 °, respectively.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The present embodiment provides an imaging quality detection apparatus of a virtual image forming optical system, as shown in fig. 1, including: the device comprises a display screen 1, a system 2 to be detected into a virtual image, a flat lens 3 and a receiving device 4; a light source on the display screen 1 sequentially passes through the virtual image system 2 to be detected, the flat lens 3 and the receiving device 4; an included angle α between the display screen 1 and the flat lens 3 is 30-45 °, an included angle β between the flat lens 3 and the receiving device 4 is 30-45 °, and α ═ β is satisfied; the display screen 1 and the system 2 to be detected into virtual images are used for forming virtual images; the flat lens 3 is used for converting the virtual image into a real image; the receiving means 4 is used for receiving the real image.
Specifically, the picture is imaged through the to-be-detected virtual image system 2 through the display screen 1, the positions of the display screen 1 and the to-be-detected virtual image system 2 can be adjusted, and the display screen 1 and the to-be-detected virtual image system 2 can be adjusted to proper positions according to actual conditions in the detection process; the rear end of the virtual image system 2 to be detected is connected with the flat lens 3, the distance between the virtual image system 2 to be detected and the flat lens 3 can be adjusted along a light path, the adjustment can be carried out according to requirements during detection, and meanwhile, the included angle alpha between the display screen 1 and the flat lens 3 is 30-45 degrees, so that the imaging quality is ensured; the rear end of the flat lens 3 is connected with a receiving device 4, the distance between the flat lens 3 and the receiving device 4 is adjusted along the light path to adjust the size of the image, and meanwhile, the included angle beta between the flat lens 3 and the receiving device 4 is 30-45 degrees.
It should be noted that the included angle α and the included angle β need to be adjusted simultaneously, and α ═ β is satisfied.
Taking the receiving device as a wavefront sensor as an example, the image received by the wavefront sensor is subjected to wavefront analysis, so as to obtain corresponding image quality evaluation, and the detection process is completed.
In addition, the angle between the square light source on the display screen and the arrangement position of the flat lens is tested for many times, and the test effect is shown in fig. 2-1 to 2-5, and it can be seen that when α ═ β ═ 30 °, the obtained imaging quality is the best.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. An imaging quality detection method of a virtual image forming optical system is realized by using an imaging quality detection device, and the imaging quality detection device comprises: the system comprises a display screen, a system to be detected into a virtual image, a flat lens and a receiving device;
a light source on the display screen sequentially passes through the system to be detected into a virtual image, the flat lens and the receiving device; an included angle alpha between the display screen and the flat lens is 30-45 degrees, an included angle beta between the flat lens and the receiving device is 30-45 degrees, and alpha-beta is satisfied;
the display screen and the system to be detected into the virtual image are used for forming a virtual image;
the flat lens is used for converting the virtual image into a real image; the flat lens is a flat lens with a negative equivalent refractive index;
the receiving device is used for receiving the real image;
the imaging quality detection method comprises the following steps:
the positions of the display screen and the virtual image system to be detected are adjusted, so that a light source on the display screen passes through the virtual image system to be detected to form a virtual image;
adjusting the distance between the receiving device and the flat lens along the optical path to adjust the size of the image;
and analyzing the real image received by the receiving device to obtain key parameters of the to-be-detected virtual image system, so as to evaluate the imaging quality of the to-be-detected virtual image system.
2. The method for detecting the imaging quality of the virtual image forming optical system according to claim 1, wherein an included angle α between the display screen and the flat lens is 30 °, and an included angle β between the flat lens and the receiving device is 30 °.
3. The method for detecting the imaging quality of the virtual image forming optical system according to claim 1, wherein the receiving means is a wavefront sensor.
4. The method for detecting the imaging quality of the virtual image forming optical system according to claim 1, wherein the receiving means is an interferometer.
5. The method for detecting imaging quality of the virtual image forming optical system according to claim 1, wherein the key parameter includes at least one of: magnification, distortion, resolution, chromatic aberration.
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