CN112798597A

CN112798597A - Stray light testing system and method

Info

Publication number: CN112798597A
Application number: CN202110144558.7A
Authority: CN
Inventors: 于立民
Original assignee: Shanghai Beilan Optoelectronics Technology Co ltd
Current assignee: Shanghai Beilan Optoelectronics Technology Co ltd
Priority date: 2021-02-02
Filing date: 2021-02-02
Publication date: 2021-05-14

Abstract

The invention discloses a stray light testing system which comprises an external support, an integrating sphere, a camera system, an LED light source, a light trap and a camera support, wherein the integrating sphere is arranged on the external support, a plurality of openings are formed in the integrating sphere and comprise a shooting port, a light source mounting port and a light trap port, the shooting port is connected with the camera system, the light source mounting port is connected with the LED light source, the light trap port is connected with the light trap, and the camera system is arranged on the camera support. The stray light test system is suitable for testing and checking various lenses, lenses and stray light of imaging equipment, and can be used for measuring optical performances of the lenses, the lenses and the imaging equipment, such as white field gray scale, black field gray scale, stray light coefficient and the like. The integrating sphere structure is adopted to realize uniform illumination, and the illumination brightness is adjusted through the current controller, so that the test requirements of the lens on different spectra and brightness required lenses are met. And the mode of large-size optical trap is matched to realize that the ratio is more than 1000: 1, the accuracy of the test result is ensured.

Description

Stray light testing system and method

Technical Field

The invention relates to the field of optical measurement, in particular to a stray light testing system and a method.

Background

The image information received by the imaging surface of the optical system not only comes out of the image itself, but also includes stray light generated by the lens and the imaging subject itself. Stray light can cause the contrast of a picture to be reduced, and higher requirements are made on the optical performance of lenses, lenses and imaging equipment.

Therefore, a high-accuracy stray light testing system is required.

Disclosure of Invention

In order to solve the above problems, the present invention provides a high-accuracy stray light testing system and method.

The stray light testing system comprises an external support, an integrating sphere, a camera system, an LED light source, a light trap and a camera support, wherein the integrating sphere is arranged on the external support, a plurality of openings are formed in the integrating sphere and comprise a shooting opening, a light source mounting opening and a light trap opening, the shooting opening is connected with the camera system, the light source mounting opening is connected with the LED light source, the light trap opening is connected with the light trap, and the camera system is arranged on the camera support.

In the above scheme, a lens clamp is arranged between the shooting port and the camera system.

In the above scheme, a wafer insertion groove is arranged between the light trap and the light trap port.

In the above scheme, the two LED light sources are provided, and the two LED light sources comprise a first LED light source and a second LED light source, wherein the first LED light source is a 6500K high-color temperature and 3000K low-color temperature white LED light source, and the second LED light source is an 850nm and 950nm infrared LED light source.

In the above scheme, the LED illumination device further comprises a controller, the controller is connected with the LED light source, and the controller can control the brightness of the LED light source by adjusting the current.

In the scheme, the diameter of the integrating sphere is 50cm, and the uniform light in the integrating sphere is diffused and uniform light.

In the scheme, the camera system obtains the bright-dark contrast condition in the system through shooting, the stray light testing system is provided with automatic identification software, and the bright-dark contrast picture obtained through shooting is automatically analyzed and calculated to obtain the required stray light coefficient.

The invention has the advantages and beneficial effects that: the invention provides a stray light testing system and method with high accuracy, which are suitable for testing and checking stray light of various lenses, lenses and imaging equipment, can be used for measuring optical properties of lenses, lenses and imaging equipment, such as white field gray scale, black field gray scale, stray light coefficient and the like, and meet various testing requirements of national standard GB/T10988. The integrating sphere structure is adopted to realize uniform illumination, and the illumination brightness is adjusted through the current controller, so that the test requirements of the lens on different spectra and brightness required lenses are met. And the mode of large-size optical trap is matched to realize that the ratio is more than 1000: 1, the accuracy of the test result is ensured. And acquiring images through a camera system, and obtaining required optical performance indexes through operation analysis.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of the present invention.

In the figure: 1. external support 2, integrating sphere 3, camera system 4 and light trap

5. Camera bracket 6, lens clamp 7, insertion sheet groove 8 and first LED light source

9. Second LED light source

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1, the invention is a stray light testing system, which comprises an external support 1, an integrating sphere 2, a camera system 3, an LED light source, an optical trap 4 and a camera support 5, wherein the integrating sphere 2 is arranged on the external support 1, a plurality of openings are arranged on the integrating sphere 2, the openings comprise a shooting opening, a light source mounting opening and an optical trap opening, the shooting opening is connected with the camera system 3, the light source mounting opening is connected with the LED light source, the optical trap opening is connected with the optical trap 4, the camera system 3 is arranged on the camera support 5 to shoot and collect the inside of the integrating sphere 2, the camera system 3 can move linearly on the support, the distance between the camera system 3 and the optical trap 4 is adjusted, and different focal length lenses and imaging equipment can.

A lens clamp 6 is arranged between the shooting opening and the camera system 3 and is used for facilitating clamping of various lenses, lenses and imaging equipment.

And a plug-in sheet groove 7 is arranged between the light trap 4 and the light trap opening. The integrating sphere 2 is connected with the large-size light trap 4, and the contrast between the white gray scale of the integrating sphere 2 and the black gray scale of the light trap is realized. An insert groove 7 is arranged in the middle, the diameters of the round holes in the insert are different, and the insert groove is used for changing the opening size of the optical trap 4 and is convenient for using different view field lenses and imaging systems. By changing different brightness in the integrating sphere 2 and the total black of the light trap 4, the contrast between different brightness and background is realized on the spherical wall, and the contrast ratio is more than 1000: 1, can be used for testing the brightness response and the stray coefficient of lenses, lenses and imaging equipment.

The two LED light sources are arranged and comprise a first LED light source 8 and a second LED light source 9, the first LED light source 8 is a 6500K high-color temperature and 3000K low-color temperature white LED light source, the second LED light source 9 is an 850nm and 950nm infrared LED light source, the LED light sources can simulate illuminants with different color temperatures, and testing of lenses required by different spectrums is met.

The LED light source integrating sphere also comprises a controller, wherein the controller is connected with the LED light source, different brightness in the integrating sphere is realized by adjusting the input current of the LED, and the integrating sphere can be used as gray scales with different brightness.

The integrating sphere 2 is 50cm in diameter, and the required diffuse uniform light on the sphere wall is obtained by integrating the light in the sphere.

The light is homogenized through the integrating sphere structure to obtain the required diffused uniform light on the sphere wall, the LED light source is arranged on the integrating sphere wall, the illumination with different color temperatures can be simulated, the output with different brightness is realized by adjusting the input current of the LED, and the large-size light trap is additionally arranged on the sphere wall to realize the contrast between the required brightness and the background. And data acquisition is carried out through a camera system and an image collector, and operation analysis is carried out through subsequent software to obtain various required data indexes. In addition, an insert groove is arranged between the integrating sphere and the light trap, inserts with different diameter holes can be inserted, and the lens and the imaging equipment with different view fields can be conveniently used. The camera system is arranged on the camera bracket, the distance between the camera system and the light trap can be adjusted, and different focal length lenses and imaging equipment can be conveniently used. The system is provided with software, and the system automatically identifies and calculates and analyzes the shot and collected black-and-white gray scale images through the software to obtain optical parameters such as the required white field gray scale, black field gray scale, stray light coefficient and the like.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a stray light test system, its characterized in that includes outside support, integrating sphere, camera system, LED light source, light trap and the support of making a video recording, be equipped with the integrating sphere on the outside support, be equipped with a plurality of openings on the integrating sphere, including shooting mouth, light source installing port and light trap mouth, it is connected with camera system to shoot the mouth, the light source installing port is connected with the LED light source, the light trap mouth is connected with the light trap, camera system locates on the support of making a video recording.

2. A stray light testing system according to claim 1, wherein a lens holder is provided between the camera opening and the camera system.

3. A stray light testing system according to claim 1, wherein a tab slot is provided between the optical trap and the optical trap port.

4. A stray light testing system as claimed in claim 1, wherein there are two of the LED light sources, including a first LED light source and a second LED light source, the first LED light source being a 6500K high color temperature and 3000K low color temperature white LED light source, the second LED light source being a 850nm and 950nm infrared LED light source.

5. A stray light testing system as claimed in claim 1, further comprising a controller connected to the LED light source, wherein the controller can control the brightness of the LED light source by adjusting the current.

6. A stray light testing system according to claim 1, wherein the integrating sphere is 50cm in diameter, and the integrating sphere internal uniform light is diffused uniform light.

7. A stray light testing method as claimed in claim 1, wherein the camera system obtains the bright-dark contrast condition in the system by shooting, and the stray light testing system is provided with automatic identification software to automatically analyze and calculate the bright-dark contrast picture obtained by shooting to obtain the required stray light coefficient.