A target generation device with a large dynamic range and continuously adjustable target source

Abstract

The present invention relates to a target source target generating device, in particular to a target source target generating device with a large dynamic range and continuous adjustable, comprising: a light source device; an aperture stop device, arranged at one side of the light source device; a main integrating sphere, arranged at one side of the aperture stop device; a background integrating sphere, arranged at one side of the main integrating sphere and arranged opposite to the beam combining mirror device; a target integrating sphere, arranged at one side of the main integrating sphere and arranged opposite to the beam combining mirror device; a first fine adjustment device, arranged between the main integrating sphere and the background integrating sphere; a second fine adjustment device, arranged between the main integrating sphere and the target integrating sphere; a target device, arranged between the target integrating sphere and the beam combining mirror device; an illumination detection device, respectively arranged on the background integrating sphere and the target integrating sphere; and a control device, respectively connected to the light source device, the aperture stop device, the first fine adjustment device, the second fine adjustment device, the target device and the illumination detection device. The device generates a target under a specified illumination and contrast, and realizes continuous dimming over a large dynamic range.

Description

Technical Field

[0001] The present invention relates to a target source target generating device, in particular to a target source target generating device with a large dynamic range and continuous adjustment. Background Art

[0002] With the development of optoelectronic equipment, there are further requirements for the detection capability test, especially the detection of solid-state micro-optical device equipment. The performance test of lower illumination, lower contrast and larger field of view has been proposed, and a more refined evaluation system needs to be established. Minimum resolvable contrast (MRC) is an evaluation parameter that can quantitatively describe the threshold contrast of the optoelectronic imaging system. It combines factors such as the system's sensitivity and noise, the target spatial frequency and the visual characteristics of the human eye, and can more comprehensively reflect the ultimate performance of the optoelectronic imaging system. However, to test MRC, a device that can generate a continuously adjustable source target under extremely low illumination is first required.

[0003] The resolution test target usually consists of a light source, an integrating sphere, and other parts. For example, Harbin Institute of Technology has developed a portable adjustable contrast target source generator device using the overlapping integrating sphere method. The target source device mainly consists of a background integrating sphere, a target integrating sphere, and a spectroscopic system. It uses a light source to provide illumination to each integrating sphere through spectroscopic means. The device uses an external adjustable rheostat to change the voltage value so that the brightness of the light source of the integrating sphere can be adjusted from 0.3 to 200 cd / m 2 However, since the target optical contrast is adjustable by adjusting the light source voltage and optical devices (such as attenuation plates), the stability of the color temperature and other indicators of the target source lacks effective guarantees, and the range of change of the target optical contrast cannot be precisely and continuously adjusted. The error of the instrument in measuring brightness is ±0.3cd / m 2 The expanded uncertainty of MRC does not exceed 3%. Figure 16 shown.

[0004] like Figure 17 As shown in the figure, the Changchun Institute of Optics, Fine Mechanics and Physics has developed an adjustable contrast target source device. The device mainly consists of a background integrating sphere, a target integrating sphere, a precision turntable, an illumination system and an electronic control system. Its characteristics are: two integrating spheres connected end to end are used to simulate the uniform background of the sky and the target respectively, with the large-sized background integrating sphere in front and the small-sized target integrating sphere in the back. The advantage of using the large-sized background integrating sphere is that the background radiance and field of view are larger; the diaphragm is adjusted by a precision transmission mechanism, so that the radiance of the two integrating spheres can be continuously adjusted, and the maximum radiance of the target and background is 38W / (m 2·str), the target source size can be varied by changing the aperture of the target plate at the exit of the integrating sphere. Although this device achieves continuous adjustment of the target optical contrast value, the adjustment dynamics are too small to meet the measurement requirements of some night vision systems, image intensifiers, and near-infrared cameras.

[0005] Therefore, the technical problems that the device needs to solve are:

[0006] The dynamic range of the target source is insufficient, especially in low light conditions;

[0007] The optical contrast range cannot be adjusted continuously. Summary of the Invention

[0008] In order to solve the above problems of insufficient dynamic range of target source and inability to continuously adjust the optical contrast variation range, the present invention provides a target generation device with a large dynamic range and continuously adjustable target source. The specific technical solution is as follows:

[0009] A target source target generating device with a large dynamic range and continuous adjustment, comprising: a light source device; an aperture stop device, arranged on one side of the light source device; a main integrating sphere, arranged on one side of the aperture stop device; a background integrating sphere, arranged on one side of the main integrating sphere and opposite to a beam combining mirror device; a target integrating sphere, arranged on one side of the main integrating sphere and opposite to the beam combining mirror device; a first fine-tuning device, arranged between the main integrating sphere and the background integrating sphere; a second fine-tuning device, arranged between the main integrating sphere and the target integrating sphere; a target device, arranged between the target integrating sphere and the beam combining mirror device; an illumination detection device, respectively arranged on the background integrating sphere and the target integrating sphere; and a control device, respectively connected to the light source device, the aperture stop device, the first fine-tuning device, the second fine-tuning device, the target device and the illumination detection device.

[0010] Preferably, it further comprises: a filter device, which is arranged between the light source device and the aperture stop device.

[0011] Preferably, the illumination detection device includes: an attenuation device, which is provided on the background integrating sphere and the target integrating sphere; and an illuminometer, which is provided on the attenuation device.

[0012] Furthermore, the attenuation device includes: an attenuation seat, which is provided with a detection hole and an attenuation groove communicating with the detection hole, the attenuation seat is provided on the background integrating sphere and the target integrating sphere, and is connected to the illuminance meter, and the illuminance meter is arranged opposite to the detection hole; an attenuation plate, which is slidably provided in the attenuation groove and is provided with a plurality of attenuation holes; at least one attenuation sheet, which is provided in the attenuation hole; and an attenuation moving device, which is provided on the attenuation seat and connected to the attenuation plate, and is used to switch a plurality of the attenuation holes so that the attenuation holes are arranged opposite to the detection hole and the illuminance meter.

[0013] Preferably, the first fine-tuning device has the same structure as the second fine-tuning device, and the first fine-tuning device includes: a fine-tuning seat; an upper aperture plate, which is slidably arranged on the fine-tuning seat and is provided with a fan-shaped upper aperture hole; a lower aperture plate, which is slidably arranged on the fine-tuning seat and is provided with a fan-shaped lower aperture hole, and the lower aperture plate is also located below the upper aperture plate, and the upper aperture hole is arranged opposite to the lower aperture hole; a fine-tuning motor, which is arranged on the top of the fine-tuning seat; a fine-tuning large pulley, which is arranged on the fine-tuning motor; two fine-tuning small pulleys, which are rotatably arranged at the bottom of the fine-tuning seat and are symmetrically located on both sides of the fine-tuning large pulley; and a fine-tuning belt, which is sleeved on the fine-tuning large pulley and the two fine-tuning small pulleys, and is respectively connected to the upper aperture plate and the lower aperture plate.

[0014] Furthermore, it also includes: a tension spring, with two ends respectively arranged on the fine-tuning seat and the lower aperture plate.

[0015] Furthermore, it also includes: a tensioner, which is arranged between the fine-tuning small pulleys, and the fine-tuning belt passes through the tensioner.

[0016] Preferably, the target device includes: a target base provided with a target hole; a target motor provided on the target base; a target plate rotatably provided on the target base and provided with a plurality of target holes; a plurality of discrimination plates provided on the target holes and arranged opposite to the target holes; and a target gear provided on the target motor and engaged with the target gear ring of the target plate.

[0017] Preferably, the background integrating sphere and the target integrating sphere both include an integrating sphere body, and the integrating sphere body is provided with an incident light hole, an exit light hole and a baffle, the incident light hole and the exit light hole are perpendicular to each other, and the baffle is arranged between the incident light hole and the exit light hole, and is arranged opposite to the incident light hole, for preventing the first reflected light from directly irradiating the exit light hole.

[0018] Furthermore, it also includes: uniform light frosted glass, which is arranged on the incident light hole and / or the exit light hole; and a coating, which is arranged inside the integrating sphere body, and the coating is any one of magnesium oxide, barium sulfate or polytetrafluoroethylene.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The invention provides a target source target generating device with a large dynamic range and continuous adjustable light source, which generates a target under a specified illumination and contrast, thereby realizing continuous light modulation in a large dynamic range. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the application structure;

[0022] Figure 2 is a schematic structural diagram of a first fine adjustment device;

[0023] Figure 3 is a cross-sectional view of a first fine adjustment device;

[0024] Figure 4 Schematic diagram of the structure of the upper aperture plate;

[0025] Figure 5 It is a structural diagram of the lower aperture plate;

[0026] Figure 6 It is a structural schematic diagram of an illumination detection device;

[0027] Figure 7 is a cross-sectional view of the illumination detection device along the X-axis;

[0028] Figure 8 is a cross-sectional view of the illumination detection device along the Y axis;

[0029] Figure 9 It is a schematic structural diagram of the target device;

[0030] Figure 10 is the distribution diagram of the discrimination plate;

[0031] Figure 11 It is a schematic diagram of the structure of the integrating sphere;

[0032] Figure 12 is a ray tracing diagram;

[0033] Figure 13 is the illumination distribution diagram;

[0034] Figure 14 This is the diffuse reflectivity curve of barium sulfate and polytetrafluoroethylene coating.

[0035] Figure 15 It is a structural diagram;

[0036] Figure 16 Harbin Institute of Technology developed a portable target generator with adjustable contrast using the overlapping integrating sphere method.

[0037] Figure 17 It is an adjustable contrast target source device developed by the Changchun Institute of Optics, Fine Mechanics and Physics. DETAILED DESCRIPTION

[0038] The present invention will now be further described with reference to the accompanying drawings.

[0039] like Figures 1 to 15 As shown, a target source generation device with a large dynamic range and continuous adjustment includes a light source device 24, an aperture stop device 25, a main integrating sphere 21, a background integrating sphere 23, a target integrating sphere 22, a first fine-tuning device 31, a second fine-tuning device 32, a target device 5, an illumination detection device 4, and a control device. The light source device 24 is mounted on the aperture stop device 25, which is mounted on the main incident light hole of the main integrating sphere 21. The main integrating sphere 21 is also provided with a first exit light hole and a second exit light hole. The first exit light hole communicates with the incident light hole of the target integrating sphere 22 through the first fine-tuning device 31, and the second exit light hole communicates with the incident light hole of the background integrating sphere 23 through the second fine-tuning device 32. The target device 5 is mounted between the target integrating sphere 22 and the beam combiner device 6. The illumination detection device 4 is mounted on the background integrating sphere 23 and the target integrating sphere 22, and is used to detect the illumination inside the integrating sphere. The control device is respectively connected to the light source device 24, the aperture stop device 25, the first fine adjustment device 31, the second fine adjustment device 32, the target device 5 and the illumination detection device 4. The target device 5 and the background integrating sphere 23 are both arranged opposite to the beam combiner 6.

[0040] Because accurate output of beam illumination over a wide dynamic range is required, a combination of coarse and fine adjustments is used for automatic dimming. The main integrating sphere 21 uses a stepper motor to drive the aperture diaphragm device 25 for coarse adjustment, enabling switching between different ranges. The background and target integrating spheres 23 and 22 are fine-tuned using the illumination detection device 4 in conjunction with a fine adjustment device, ultimately achieving precise control of the output beam.

[0041] The aperture diaphragm assembly 25 is a variable aperture diaphragm capable of dimming, also known as a motorized aperture target wheel. This mature product is not described in detail here. Coarse adjustment of the continuously adjustable dimming is achieved through the aperture diaphragm assembly 25, while fine adjustment is achieved through the fine adjustment mechanism. Two sets of fine adjustment mechanisms, driven by motor-controlled guide rails, move the two diaphragm blades, expanding or contracting the central aperture, thereby achieving continuously adjustable contrast.

[0042] For beam fine-tuning, a sector diaphragm is used. A motor drives two sector diaphragms to move precisely on a linear guide rail. The motor uses a conveyor belt to enable the two diaphragms to move simultaneously towards or in opposite directions.

[0043] The device solves the problem that traditional visible light target generators cannot work or have low accuracy under low illumination, and the problem that traditional visible light target generators cannot continuously adjust the contrast. It is suitable for application scenarios that require visible light contrast testing and MRC testing.

[0044] A filter device is also installed in the light source device 24 and the aperture diaphragm device 25. The filter device is combined with the aperture diaphragm to improve the continuity of the light source gear of the whole machine and reduce the possibility of specific values ​​of illumination and contrast that are difficult to adjust continuously in certain gears. Secondly, by adjusting the film system of different filters, a certain compensation is made for the color temperature imbalance under different brightness conditions, so that the final light output color temperature is controlled within a certain range.

[0045] The light source device 24 is a halogen lamp equipped with a reflective bowl and a lens. The light source device 24 is a conventional structure and will not be described in detail herein. The light source device 24 can be adjusted to ensure that the light flux passing through the slit can meet the requirements of the maximum bright spot test.

[0046] The integrating spheres consist of three components: a main integrating sphere 21, a target integrating sphere 22, and a background integrating sphere 23. The main integrating sphere 21 has an inner diameter of Φ160mm, while the other two spheres have an inner diameter of Φ220mm. The integrating spheres feature a two-piece design, precision-cast from aluminum alloy, connected by screws. The inner surfaces of the integrating spheres are sprayed with a reflective coating of polytetrafluoroethylene, which provides high reflectivity and excellent spectral stability within the 400nm to 1100nm wavelength range.

[0047] like Figures 11 to 14 As shown, the integrating sphere body 1 is provided with an incident light hole 11, an exit light hole 12 and a baffle 13. The incident light hole 11 and the exit light hole 12 are perpendicular to each other. The baffle 13 is arranged between the incident light hole 11 and the exit light hole 12 and is arranged opposite to the incident light hole 11 to prevent the first reflected light from directly irradiating the exit light hole 12.

[0048] The function of the baffle 13 is to prevent the first reflected light from directly irradiating the exit light hole 12. The baffle 13 is sprayed with the same material as the inner surface of the integrating sphere body 1. The angle A between the baffle 13 and the axis of the exit light hole 12 is 134.24°, that is, the angle between the baffle 13 and the horizontal direction is 45.76°. The length is 17 mm, and the installation position is 17.7 mm horizontally from the center of the integrating sphere body 1.

[0049] The diameters of the incident light hole 11 and the exit light hole 12 are 50 mm, and the bulb of the integrating sphere body 1 is 200 mm.

[0050] The integrating sphere body 1 adopts a two-part design, made of cold-rolled and stamped stainless steel sheets, and connected by screws to form the complete integrating sphere body 1. A connecting flange is welded at the light port and connected to other components by screws.

[0051] like Figure 1 As shown, a three-integrating-sphere light source structure is used. After entering the main integrating sphere 21, the light flux is split into two paths. Therefore, the light flux entering the foreground integrating sphere and the background integrating sphere 23 is considered to be half of the light flux entering the main integrating sphere 21. Therefore, during optical tracing simulation, ray tracing is performed only on the target integrating sphere 22 or the background integrating sphere 23.

[0052] The TracePro lighting design software was used to trace the light inside the integrating sphere body 1, and then the illumination uniformity at the outlet of the integrating sphere body 1 was simulated and analyzed.

[0053] like Figures 12 to 14 As shown, the lighting source is divided into two levels: strong light and weak light. Below, only the light of the strong light source model is traced, and the number of traced rays is 12,500. Based on the data of the incident light hole 11 and the exit light hole 12 area, the illumination uniformity is calculated and the uniformity is 98%.

[0054] To further improve light uniformity, frosted glass is installed at both the entrance and exit apertures 11 and 12 to provide secondary homogenization of the light passing through. Testing revealed that, without the frosted glass, the light exiting the integrating sphere body 1 alone resulted in a measured non-uniformity of 3.8576%. However, with the frosted glass installed, light uniformity was significantly improved. Using a calibrated luminance meter, measurements at multiple locations on the light exiting the integrating sphere body 1 revealed a non-uniformity of 0.8522%.

[0055] The inside of the integrating sphere body 1 is provided with a coating. The coating is any one of magnesium oxide, barium sulfate or polytetrafluoroethylene. This embodiment uses polytetrafluoroethylene, which not only has a high reflectivity in the infrared spectrum, but also is not easy to fall off into powdery substances, such as Figure 14 Shown are the diffuse reflectance / wavelength curves of barium sulfate (green) and polytetrafluoroethylene (red) coatings. The polytetrafluoroethylene coating is a nano-scale coating.

[0056] like Figures 2 to 5As shown, the first fine-tuning device 31 has the same structure as the second fine-tuning device 32. The first fine-tuning device 31 includes a fine-tuning seat 33, an upper aperture plate 34, a lower aperture plate 35, a fine-tuning motor 366, a fine-tuning large pulley 361, a fine-tuning small pulley 362, a fine-tuning belt 363 and a tensioning spring 365. The upper aperture plate 34 and the lower aperture plate 35 are both slidably mounted on the fine-tuning seat 33 through a linear guide pair. The structure of the upper aperture plate 34 is the same as that of the lower aperture plate 35. The upper aperture plate 34 is provided with a fan-shaped upper aperture hole 341; the lower aperture plate 35 is provided with a fan-shaped lower aperture hole The lower aperture plate 35 is also located below the upper aperture plate 34, with the upper aperture 341 and the lower aperture 351 positioned opposite each other. A fine-tuning motor 366 is mounted on top of the fine-tuning base 33 and connected to the large fine-tuning pulley 361. Two small fine-tuning pulleys 362 are provided, rotatably mounted on the bottom of the fine-tuning base 33 and symmetrically located on either side of the large fine-tuning pulley 361. The fine-tuning belt 363 is mounted on the large fine-tuning pulley 361 and the two small fine-tuning pulleys 362, and is connected to the upper aperture plate 34 and the lower aperture plate 35, respectively. The ends of a tension spring 365 are connected to the fine-tuning base 33 and the lower aperture plate 35, respectively, to ensure adjustment accuracy. A tension pulley 364 is rotatably mounted on the fine-tuning base 33 and located between the two small fine-tuning pulleys 362. The fine-tuning belt 363 passes through the tension pulley 364.

[0057] Fine-adjustment belt 363 can be made of a 0.04mm thick steel belt, driven by a stepper motor. The tensioned steel belt drives the upper and lower aperture plates 34 and 35 up and down, allowing light to pass through the upper and lower aperture holes 341 and 351, achieving aperture adjustment, or fine-tuning of contrast. The tension spring 365 eliminates backlash, and the tensioner pulley 364 compensates for the stretching of the steel belt after long-term use.

[0058] The target integrating sphere 22 and the background integrating sphere 23 have the same diameter, the same diameter for the light entrance and exit ports, and the exact same fine-tuning device for controlling the light entrance area, ensuring the stability of the total illumination. Fine-tuning motor 366 utilizes a stepper motor. Properly setting the stepper motor driver parameters can improve the accuracy of the contrast control system, specifically by increasing the driver's subdivision and reducing the driver pulse frequency, which in turn reduces the motor's operating speed.

[0059] The step angle of the stepper motor is 1.8°, and the maximum subdivision of the stepper motor driver is 128. The calculation formula of the minimum step angle θ of the motor is as follows:

[0060]

[0061] The radius of the fine-adjustment device wheel is 54.2 mm, so the minimum adjustment distance S of the fine-adjustment device is:

[0062]

[0063] The radius of the small circle of the fan-shaped part of the fine-tuning device is 1mm, and the radius of the large circle is 25mm. Therefore, the minimum adjustment area of ​​the fine-tuning device is 0.2628mm2, and the maximum adjustment area of ​​the fine-tuning device is 6.62mm2. The illumination at the light outlet of the main integrating sphere 21 is uniform. It can be approximately considered that the ratio of illumination is equal to the ratio of area. Therefore, the ratio P of the minimum adjustment illumination of the fine-tuning device to the maximum illumination is:

[0064]

[0065] Contrast measurement range design. The contrast measurement range is verified by reading the target and background illumination values ​​through the monitoring illuminance meter 47 on the target integrating sphere 22 and the background integrating sphere 23 respectively, and using the following formula to calculate the contrast test range: Since the target plate with dark lines and bright background is used, the illumination of the target is actually given by the background integrating sphere 23. The illumination of the target is affected by the foreground illumination and the background illumination. Therefore, the contrast formula under a certain illumination is changed to the following:

[0066]

[0067] According to the above formula, when the target Eb = 9.5Et, the contrast value is: 5%;

[0068] When the target Eb=0.005Et, the contrast value is: 99%; the accuracy of the contrast control system can fully meet the system test requirements and can achieve the indicator contrast measurement range: 5% to 99%.

[0069] like Figures 6 to 8 As shown, the illumination detection device 4 includes an attenuation device and an illuminometer 47. The attenuation device is mounted on the background integrating sphere 23 and the target integrating sphere 22; the illuminometer 47 is mounted on the attenuation device. The attenuation device includes an attenuation seat 41, an attenuation plate 42, an attenuation sheet 43, and an attenuation moving device. The attenuation seat 41 is provided with a detection hole 411 and an attenuation slot 412 communicating with the detection hole 411. The attenuation seat 41 is mounted on the background integrating sphere 23 and the target integrating sphere 22 and is connected to the illuminometer 47. The illuminometer 47 is arranged opposite the detection hole 411. The attenuation plate 42 is slidably mounted in the attenuation slot 412 and is provided with a plurality of attenuation holes 421. The attenuation sheet 43 is mounted in the attenuation hole 421. The attenuation sheet 43 can correspond one-to-one with the attenuation hole 421, or one attenuation hole 421 can be left unmounted by the attenuation sheet 43. The attenuation moving device includes an attenuation motor 46, an attenuation gear 44 and an attenuation rack 45. The attenuation motor 46 is installed on the attenuation seat 41 and is connected to the attenuation gear 44. The attenuation rack 45 is engaged with the attenuation gear 44. The attenuation rack 45 is also installed on the attenuation plate 42. The attenuation moving device is used to switch several attenuation holes 421 so that the attenuation holes 421 are arranged relative to the detection hole 411 and the illuminance meter 47.

[0070] Illuminance meter 47, the feedback component of the control device, is installed above the target integrating sphere 22 and the background integrating sphere 23. It is used to read the illuminance inside the integrating spheres in real time. Because illuminance meter 47 cannot be used under high illumination, an attenuation device is designed at the probe of illuminance meter 47. By switching the attenuation device's state, illuminance meter 47 can be used in both low and high illumination conditions. The attenuation device is controlled by a DC motor plus a limit switch. The DC motor is controlled by a DC motor controller. Before the attenuation device is installed, the measurement range of illuminance meter 47 is 1×10 -6 ~1×10 5 lx, the attenuation component has a 1000-fold attenuation plate 43. After the attenuation device is installed, the measurement range of the illuminometer 47 is 1×10 -2 ~1.5×10 4 lx, meeting or even exceeding the requirements of the instrument in the high illumination measurement range, and improving the control accuracy of contrast in high illumination.

[0071] like Figure 9 and Figure 10 As shown, the target device 5 includes a target base 51, a target motor 54, a target plate 52, a discriminator plate 53, and a target gear 55. The target base 51 is provided with a target hole 511 and a target rotating base 57. The target rotating base 57 is equipped with bearings both inside and outside. The internal bearing is connected to the target rotating shaft 56, and the external bearing is connected to the target plate 52. The target rotating shaft 56 is also connected to the target plate 52. The two bearings enhance the stability and reliability of the rotation. The target plate 52 is annularly provided with a plurality of target holes 521. The target holes 521 are equipped with discriminator plates 53. The discriminator plates 53 correspond to the target holes 521 one by one and are arranged opposite the target holes 511. The target motor 54 is mounted at one end of the target base 51 and connected to the target gear 55. The target gear 55 meshes with the target gear ring 522 of the target plate 52. The target motor 54 drives the target plate 52 to rotate via the target gear 55 and the target gear ring 522, thereby switching between different discriminator plates 53.

[0072] like Figure 10 As shown, the resolution plate 53 is composed of characteristic graticules of various shapes, providing ideal, easy-to-analyze characteristic targets for contrast measurement. The resolution plate 53 includes a four-bar target, a WT1005-62 standard target, and a USAF1951 target, enabling resolution testing. The target substrate is made of fused quartz with a chrome coating in the dark areas. The optical density D is greater than 3, meaning that light transmission in the shaded areas is ≤0.1%. The slits are fabricated using photolithography, achieving a slit nonlinearity of less than 0.5 μm.

[0073] like Figure 15As shown, to ensure the stability of the light source and the foreground and background brightness, closed-loop control is adopted. The control device adopts closed-loop control, which greatly improves the control accuracy and stability of the control device. The aperture stop device 25 controls the overall brightness, the attenuation device is used to expand the measurement range of the illuminance meter 47, and the fine-tuning component adjusts the brightness of the background and foreground to produce the required contrast. The illuminance detection module serves as a measuring element, detecting the actual illuminance values ​​of the background integrating sphere 23 and the foreground integrating sphere, and feeding it back to the host computer via USB communication, which controls the stepper motor to adjust the fine-tuning component.

[0074] This target source target generation device solves the problem that traditional domestic visible light target generators cannot work under low illumination or have low accuracy, and solves the problem that traditional domestic visible light target generators cannot continuously adjust the contrast. It is suitable for application scenarios that require visible light contrast testing and MRC testing.

[0075] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily devise other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the claims of the present invention.

Claims

1. A target source generation device with a large dynamic range and continuously adjustable, characterized in that: include: Light source device (24); An aperture stop device (25) disposed on one side of the light source device (24); A main integrating sphere (21), arranged on one side of the aperture stop device (25); A background integrating sphere (23) is arranged on one side of the main integrating sphere (21) and is arranged opposite to the beam combining mirror device (6); A target integrating sphere (22) is arranged on one side of the main integrating sphere (21) and is arranged opposite to the beam combining mirror device (6); A first fine adjustment device (31) is disposed between the main integrating sphere (21) and the background integrating sphere (23); A second fine adjustment device (32) is disposed between the main integrating sphere (21) and the target integrating sphere (22); A target device (5) is arranged between the target integrating sphere (22) and the beam combining mirror device (6); an illumination detection device (4), respectively arranged on the background integrating sphere (23) and the target integrating sphere (22); and a control device connected to the light source device (24), the aperture stop device (25), the first fine adjustment device (31), the second fine adjustment device (32), the target device (5), and the illumination detection device (4) respectively; It also includes: a filter device, arranged between the light source device (24) and the aperture stop device (25); The first fine adjustment device (31) and the second fine adjustment device (32) have the same structure, and the first fine adjustment device (31) comprises: Fine adjustment seat (33); An upper aperture plate (34) is slidably disposed on the fine adjustment seat (33) and is provided with a fan-shaped upper aperture hole (341); A lower aperture plate (35) is slidably disposed on the fine adjustment seat (33) and is provided with a fan-shaped lower aperture hole (351); the lower aperture plate (35) is also located below the upper aperture plate (34); the upper aperture hole (341) and the lower aperture hole (351) are arranged opposite to each other; A fine-tuning motor (366) is disposed on the top of the fine-tuning seat (33); A fine-tuning large pulley (361) is provided on the fine-tuning motor (366); Two fine-adjustment small pulleys (362) are rotatably disposed at the bottom of the fine-adjustment seat (33) and are symmetrically located on both sides of the fine-adjustment large pulley (361); and A fine-adjusting belt (363) is sleeved on the large fine-adjusting pulley (361) and the two small fine-adjusting pulleys (362), and is respectively connected to the upper aperture plate (34) and the lower aperture plate (35); It also includes: a tension spring (365), two ends of which are respectively arranged on the fine adjustment seat (33) and the lower aperture plate (35); The background integrating sphere (23) and the target integrating sphere (22) both comprise an integrating sphere body (1), the integrating sphere body (1) being provided with an incident light hole (11), an exit light hole (12) and a baffle (13), the incident light hole (11) and the exit light hole (12) being perpendicular to each other, the baffle (13) being arranged between the incident light hole (11) and the exit light hole (12) and being arranged opposite to the incident light hole (11) to prevent the first reflected light from directly irradiating the exit light hole (12); Also includes: Homogenizing frosted glass, arranged on the incident light hole (11) and / or the exit light hole (12); and A coating is provided inside the integrating sphere body (1), and the coating is any one of magnesium oxide, barium sulfate or polytetrafluoroethylene.

2. A target source generating device with a large dynamic range and continuously adjustable according to claim 1, characterized in that: The illumination detection device (4) comprises: an attenuation device, arranged on the background integrating sphere (23) and the target integrating sphere (22); and An illuminometer (47) is arranged on the attenuation device.

3. A target source generating device with a large dynamic range and continuously adjustable according to claim 2, characterized in that: The attenuation device comprises: an attenuation seat (41) provided with a detection hole (411) and an attenuation groove (412) communicating with the detection hole (411); the attenuation seat (41) is arranged on the background integrating sphere (23) and the target integrating sphere (22), and is connected to the illuminometer (47); the illuminometer (47) is arranged opposite to the detection hole (411); An attenuation plate (42) is slidably disposed in the attenuation groove (412) and is provided with a plurality of attenuation holes (421); At least one attenuation sheet (43) is disposed in the attenuation hole (421); An attenuation moving device is provided on the attenuation seat (41) and connected to the attenuation plate (42), and is used to switch a plurality of the attenuation holes (421) so that the attenuation holes (421) are arranged relative to the detection holes (411) and the illuminometer (47).

4. The device for generating a target source with a large dynamic range and continuously adjustable according to claim 1, characterized in that: Also includes: The tensioning wheel (364) is arranged between the fine-adjusting small pulleys (362), and the fine-adjusting belt (363) passes through the tensioning wheel (364).

5. The device for generating a target source with a large dynamic range and continuously adjustable according to claim 1, characterized in that: The target device (5) comprises: A target base (51) is provided with a target hole (511); A target motor (54) is disposed on the target seat (51); A target plate (52) is rotatably mounted on the target base (51) and is provided with a plurality of target holes (521); A plurality of discrimination rate plates (53) are disposed on the target hole (521) and are arranged opposite to the target hole (511); and A target gear (55) is disposed on the target motor (54) and meshes with a target gear ring (522) of the target plate (52).

Images