Ghost image analysis method and device for space telescope band-pass camera, and storage medium

Abstract

The invention belongs to the technical field of optical testing, and particularly relates to a ghost image analysis method and device of a space telescope band-pass camera and a storage medium. The ghost image analysis method of the space telescope band-pass camera comprises the following steps: acquiring a square aperture angle # imgabs0 # of the space telescope band-pass camera; the transmittance and the reflectivity of the optical filter are measured, the transmittance of the front surface of the optical filter is # imgabs 1 #, the transmittance of the rear surface of the optical filter is # imgabs 2 #, the reflectivity of the front surface of the optical filter is # imgabs 3 #, and the reflectivity of the rear surface of the optical filter is # imgabs 4 #; measuring the reflectivity of the detector, wherein the reflectivity of the surface of the detector is # imgabs5 #; the thickness # imgabs 6 # of the optical filter is measured, and the distance # imgabs 7 # between the optical filter and the detector is measured; ghost image analysis is carried out through an illuminance distribution function of the ghost image and energy, radius, coordinate calculation formulas and the like; the method achieves the quantitative analysis of the specific position, shape and magnitude of the ghost image for the first time, and can be used for the generation of a scientific simulation image.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical testing, and particularly relates to a method for analyzing ghost images of a space telescope band-pass camera, a computer device for executing the ghost image analysis method, and a non-transitory computer-readable storage medium. Background Art

[0002] For a space telescope, if multi-color imaging rather than full-color imaging is to be achieved, a band-pass filter must be used to achieve band-segment imaging of the target. To achieve band-pass for the filter, it must be coated with a film.

[0003] The principle of film coating is as follows: By depositing a series of thin film layers with different refractive indices and different thicknesses on the surface of a substrate, a function of selectively transmitting or reflecting light of a specific wavelength can be formed, thereby achieving a filtering effect. When light is incident on the surface of a multi-layer dielectric film, partial reflection and transmission occur at each interface. The optical path differences in different layers cause constructive interference (enhancement) or destructive interference (attenuation) of the reflected light or transmitted light within a specific wavelength range, so that light of certain wavelength bands is "selectively" transmitted, and light of other wavelength bands is suppressed or reflected. By precisely designing the refractive index of the thin film material and the thickness of the film layer, the filter can achieve corresponding spectral characteristics (transmittance, cut-off rate, etc.) in a specific spectral band (visible light, near-infrared, ultraviolet, etc.).

[0004] However, it is impossible to achieve 100% transmission or reflection with film coating, nor can the detectors used for imaging. Therefore, light will be reflected multiple times between the filter and the detector, resulting in ghost images. At present, although there are various methods to detect ghost images, only the presence or absence of ghost images can be analyzed, and there is a lack of quantitative analysis methods for the specific position, shape, and magnitude of ghost images, which is not conducive to accurately evaluating the impact of ghost images in astronomical observations and subsequent processing. Summary of the Invention

[0005] In view of this, the present invention aims to provide a method for analyzing ghost images of a space telescope band-pass camera. Through the ghost image analysis method of the present invention, for the first time, the specific position, shape, and magnitude of ghost images are quantitatively analyzed, and it can be used for the generation of scientific simulation images.

[0006] To achieve the above object, the technical solution of the present invention is realized as follows: The present invention provides a method for analyzing ghost images of a space telescope band-pass camera. The space telescope band-pass camera includes a filter and a detector. The ghost images of the space telescope band-pass camera include a first ghost image, a second ghost image, and a third ghost image. The first ghost image is formed by two reflections on the front surface and the back surface of the filter. The second ghost image is formed by two reflections on the back surface of the filter and the surface of the detector. The third ghost image is formed by two reflections on the front surface of the filter and the surface of the detector. The method for analyzing ghost images of the space telescope band-pass camera includes the following steps: S1. Obtain the exit pupil diameter and the optical path distance from the exit pupil to the image plane of the space telescope band-pass camera, and then obtain the image-side aperture angle ; S2. Measure the transmittance and reflectivity of the filter. The transmittance of the front surface of the filter is , the transmittance of the back surface of the filter is , the reflectivity of the front surface of the filter is , and the reflectivity of the back surface of the filter is ; S3. Measure the reflectivity of the detector. The reflectivity of the surface of the detector is ; S4. Measure the thickness of the filter , and measure the distance between the filter and the detector ; S5. Conduct ghost image analysis through the illuminance distribution function of the ghost image. The illuminance distribution function is ; is the illuminance of the first ghost image, is the illuminance of the second ghost image, is the illuminance of the third ghost image; represents a disk function with as the center and as the radius; is the radius of the first ghost image, is the radius of the second ghost image, is the radius of the third ghost image.

[0007] Further, the total energy of the first ghost image is ; The total energy of the second ghost image is ; The total energy of the third ghost image is ; Among them, The total energy of the incident light rays for the space telescope bandpass camera.

[0008] Further, the radius of the first ghost image is ; The radius of the first ghost image is ; The radius of the first ghost image is .

[0009] Further, the illuminance of the first ghost image is ; The illuminance of the second ghost image is ; The illuminance of the third ghost image is .

[0010] Further, the central coordinates of the first ghost image are ; The central coordinates of the second ghost image are ; The central coordinates of the third ghost image are .

[0011] Further, an antireflection film or a bandpass film is coated on the front surface of the filter, and an antireflection film or a bandpass film is coated on the back surface of the filter.

[0012] Further, the method for analyzing ghost images of the space telescope bandpass camera further includes the steps of: S6. Using an experimental device to conduct a ghost image test experiment to obtain image data containing ghost images; collecting ghost image information from the image data, where the ghost image information includes the position, size, and energy information of the ghost image; and substituting the ghost image information into each calculation formula for verification or derivation. The present invention also provides a computer device, including: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for analyzing ghost images of the space telescope bandpass camera of the present invention as described above.

[0013] The present invention also provides a non-transitory computer-readable storage medium storing computer instructions for causing a computer to execute the method for analyzing ghost images of the space telescope bandpass camera of the present invention as described above.

[0014] Compared with the prior art, the present invention can achieve the following beneficial effects: For the ghost image analysis method of the space telescope band-pass camera provided by the present invention, only basic parameter indicators such as the incident angle of light, the thickness of the filter, the distance between the filter and the detector, the transmittance and reflectance of the front and back surfaces of the filter, and the reflectance of the detector need to be measured, and then the position, size, and irradiance of the ghost image can be accurately obtained through the solution provided by the present invention; moreover, if the thickness of the filter, the distance between the filter and the detector, the transmittance and reflectance of the front and back surfaces of the filter, etc. cannot be accurately measured, relevant indicators can also be inversely calculated through the ghost image analysis method of this method, and then used for the simulation of scientific images and the analysis of astronomical observations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 It is a schematic diagram of the overall process of the ghost image analysis method of the space telescope band-pass camera according to the embodiment of the present invention; Figure 2 It is a schematic diagram of the optical path of ghost image formation in the ghost image analysis method of the space telescope band-pass camera according to the embodiment of the present invention; Figure 3 It is a real test image with a ghost image in the ghost image analysis method of the space telescope band-pass camera according to the embodiment of the present invention; Figure 4 It is a schematic diagram of a computer device for executing the ghost image analysis method of the space telescope band-pass camera according to the embodiment of the present invention.

[0016] Description of the reference numerals: 12. Computer device; 14. External device; 16. Processing unit; 18. Bus; 20. Network adapter; 22. I / O interface; 24. Display; 28. System memory; 30. RAM; 32. Cache; 34. Storage system; 40. Program / utilities; 42. Program module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to make the purpose, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation to the present invention.

[0018] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0019] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0020] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0021] In a specific embodiment of the present invention, a method for analyzing ghost images of a space telescope band-pass camera is provided. Specifically, it is a method for analyzing ghost images of a space telescope band-pass camera. Through the ghost image analysis method of the present invention, for the first time, the specific position, shape, and magnitude of ghost images are quantitatively analyzed, and it can be used for the generation of scientific simulation images.

[0022] Specifically, as Figure 1As shown in the figure, it is a schematic diagram of the overall process of the ghost image analysis method for the space telescope band-pass camera described in the specific embodiment of the present invention. In this specific embodiment, the space telescope band-pass camera includes a filter and a detector. The ghost images of the space telescope band-pass camera include a first ghost image, a second ghost image, and a third ghost image. The first ghost image is formed by two reflections on the front surface and the back surface of the filter. The second ghost image is formed by two reflections on the back surface of the filter and the surface of the detector. The third ghost image is formed by two reflections on the front surface of the filter and the surface of the detector. Since only even-numbered reflections can produce ghost images, and each reflection means a large amount of energy loss. For a high-quality detector, the reflectivity of each band does not exceed 20% at most, and after the filter is coated with an anti-reflection film, the reflectivity of some bands can be lower than 2%. Therefore, based on computing power and actual situations, only considering the ghost images formed by two reflections can meet the analysis requirements in the actual scenario. Therefore, the ghost image analysis method provided in the specific embodiment of the present invention only needs to consider the three ghost images formed by two reflections.

[0023] Specifically, as can be seen from the figure, the ghost image analysis method for the space telescope band-pass camera includes the steps: S1. Obtain the exit pupil diameter of the space telescope band-pass camera and the optical path distance from the exit pupil to the image plane, and then obtain the image-side aperture angle ; S2. Measure the transmittance and reflectivity of the filter. The transmittance of the front surface of the filter is , the transmittance of the back surface of the filter is , the reflectivity of the front surface of the filter is , and the reflectivity of the back surface of the filter is ; S3. Measure the reflectivity of the detector. The reflectivity of the surface of the detector is ; S4. Measure the thickness of the filter , and measure the distance between the filter and the detector ; S5. Perform ghost image analysis through the illuminance distribution function of the ghost image. The illuminance distribution function is ; is the illuminance of the first ghost image, is the illuminance of the second ghost image, is the illuminance of the third ghost image; represents a disk function with as the center and as the radius; is the radius of the first ghost image, is the radius of the second ghost image, is the radius of the third ghost image.

[0024] In a specific embodiment, the total energy of the first ghost image is ; the total energy of the second ghost image is ; the total energy of the third ghost image is ; wherein, is the total energy of the incident light rays of the space telescope bandpass camera.

[0025] The radius of the first ghost image is ; The radius of the first ghost image is ; The radius of the first ghost image is .

[0026] The illuminance of the first ghost image is ; The illuminance of the second ghost image is ; The illuminance of the third ghost image is .

[0027] The central coordinates of the first ghost image are ; The central coordinates of the second ghost image are ; The central coordinates of the third ghost image are .

[0028] In a specific embodiment, the front surface of the filter is coated with an antireflection film or a bandpass film, and the back surface of the filter is coated with an antireflection film or a bandpass film.

[0029] Further, the method for analyzing ghost images of the space telescope bandpass camera further includes the steps of: S6. Performing a ghost image test experiment using an experimental device to obtain image data containing ghost images; collecting ghost image information from the image data, where the ghost image information includes the position, size, and energy information of the ghost image; and substituting the ghost image information into each calculation formula for verification or derivation.

[0030] The specific embodiment of the present invention further provides a computer device, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the ghost image analysis method of the space telescope band-pass camera of the present invention as described above.

[0031] The specific embodiment of the present invention also provides a non-transitory computer-readable storage medium storing computer instructions, and the computer instructions are used to cause the computer to execute the ghost image analysis method of the space telescope band-pass camera of the present invention as described above.

[0032] For the ghost image analysis method of the space telescope band-pass camera provided by the present invention, only by knowing the indexes such as the incident angle of light, the thickness of the filter, the distance between the filter and the detector, the transmittance and reflectance of the front and back surfaces of the filter, and the reflectance of the detector, etc., the position, size and irradiance of the ghost image can be accurately calculated. Among them, if the thickness of the filter, the distance between the filter and the detector, the transmittance and reflectance of the front and back surfaces of the filter, etc. cannot be accurately measured, the relevant indexes can also be inversely calculated through the ghost image test and analysis of this method, and then used in the simulation of scientific images and the analysis of astronomical observations.

[0033] Specifically, if the parameters to be measured cannot be accurately measured, we can also use experimental devices such as halogen light sources, thousand-fold attenuation sheets, 3m collimators, and high-sensitivity six-degree-of-freedom adjustment platforms to generate ghost images by taking overexposed images and inversely calculate the above parameters; the specific measurement methods include: measuring a non-overexposed situation with a higher energy, recording the image point code value, exposure time, and attenuation sheet multiple; then removing the attenuation sheet and increasing the exposure time, so that the energy can be amplified by tens of thousands of times or even hundreds of thousands of times, so as to accurately obtain a clear ghost image. Then, using SAOImageDS9 or other image viewing software, obtain the energy of the image point and the energy and radius of the ghost image; the measured energy of the image point , the energy of the ghost image , the radius of the ghost image , , are brought into various calculation formula models of the present invention, and the parameters such as the thickness of the filter, the distance between the filter and the detector, the transmittance and reflectance of the front and back surfaces of the filter, and the reflectance of the detector can be inversely inferred, thus establishing the calculation formula model of the present invention; furthermore, scientific simulation images with ghost images can be generated, and the ghost images that may be generated when the telescope band-pass camera is in the sky can be analyzed.

[0034] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0035] Normally, ghost images can only be generated after an even number of reflections, and each reflection means a large amount of energy loss. For detectors with excellent quality, the reflectivity in each band does not exceed 20% at most. After the filter is coated with an antireflection film, the reflectivity in some bands can be lower than 2%. Therefore, based on computing power and actual conditions, only considering the ghost images caused by two reflections can meet the analysis requirements in the actual scenario. The space telescope bandpass camera in this embodiment includes a filter and a detector. The ghost images of the space telescope bandpass camera include a first ghost image, a second ghost image, and a third ghost image. The first ghost image is formed by two reflections on the front surface and the back surface of the filter. The second ghost image is formed by two reflections on the back surface of the filter and the surface of the detector. The third ghost image is formed by two reflections on the front surface of the filter and the surface of the detector.

[0036] As Figure 1 shown, it is a schematic diagram of the overall process of a method for analyzing ghost images of a space telescope bandpass camera provided by a specific embodiment of the present invention. It can be seen from the figure that the method for analyzing ghost images of the space telescope bandpass camera includes the steps: S1. Obtain the exit pupil diameter of the space telescope bandpass camera and the optical path distance from the exit pupil to the image plane, and then obtain the image-side aperture angle ; specifically, the image-side aperture angle can be obtained by dividing the exit pupil diameter by the optical path distance from the exit pupil to the image plane ; S2. Measure the transmittance and reflectivity of the filter. The transmittance of the front surface of the filter is , the transmittance of the back surface of the filter is , the reflectivity of the front surface of the filter is , and the reflectivity of the back surface of the filter is ; specifically, a spectrophotometer can be used for measurement. Place the filter in the optical path, record the transmitted light intensity, and calculate the transmittance by comparing it with the reference light intensity. When measuring the reflectivity, a specular reflection accessory needs to be installed, the incident angle is set, a standard mirror is used as a reference, and then the reflected light intensity of the filter is measured. The reflectivity of the sample is calculated by taking the ratio of the reflected light intensity of the filter to the reflectivity of the standard mirror.

[0037] S3. Measure the reflectivity of the detector. The reflectivity of the surface of the detector is ; specifically, the method for measuring the reflectivity of the detector is the same as the method for measuring the reflectivity of the filter described above.

[0038] S4. Measure the thickness of the filter , and measure the distance between the filter and the detector Specifically, the thickness of the filter can be directly measured with a micrometer; the distance between the filter and the detector can be measured by the microscope focusing method. Align the surfaces of the filter and the detector respectively, and record the difference in the focal plane positions, which is the distance between the two.

[0039] S5. Perform ghost image analysis through the illuminance distribution function of the ghost image, where the illuminance distribution function is ; is the illuminance of the first ghost image, is the illuminance of the second ghost image, is the illuminance of the third ghost image; represents a disc function with as the center and as the radius; is the radius of the first ghost image, is the radius of the second ghost image, is the radius of the third ghost image.

[0040] According to the specific structure of the space telescope band-pass camera in this embodiment, analyze the optical path diagram of the formation of the secondary ghost image, specifically as Figure 2 shown; from left to right in the figure, it represents the normal incident light and the image point, the light range and the center of the first ghost image, the light range and the center of the second ghost image, and the light range and the center of the third ghost image. It can be seen from the figure that the optical path of the ghost image is formed. By referring to the original light color in the optical path diagram, the propagation process of each ghost image can be seen, and each calculation formula of the present invention is obtained through optical path analysis and calculation derivation.

[0041] Specifically, in this embodiment, let the total energy of the incident light of the space telescope band-pass camera be Each time the incident light passes through the front surface of the filter, the energy is multiplied by , and each time it is reflected by the front surface of the filter, it is multiplied by ; the same applies to the transmission and reflection of the back surface of the filter, and the same applies to the reflection of the detector; therefore, the total energy of the first ghost image is ; the total energy of the second ghost image is ; the total energy of the third ghost image is .

[0042] The radius of the first ghost image is ; The radius of the first ghost image is ; The radius of the first ghost image is .

[0043] The illuminance of the first ghost image is ; The illuminance of the second ghost image is ; The illuminance of the third ghost image is .

[0044] The central coordinates of the first ghost image are ; The central coordinates of the second ghost image are ; The central coordinates of the third ghost image are .

[0045] Specifically, in this embodiment, antireflection films or band-pass films can be respectively coated on the front and back surfaces of the filter according to the specific design requirements of the telescope. They may have different transmittances and reflectances; the film thickness ranges from several hundred nanometers to several micrometers, which is much smaller than the thickness of the millimeter-level filter substrate, so it can be ignored.

[0046] S7. After changing the position, obtain the image data of the ghost image again. It can verify that the various calculation formulas provided by the present invention are correct and can be used to generate scientific simulation images.

[0047] Specifically, in this embodiment, the ghost image analysis method provided by the present invention is verified. The specific measurement method includes measuring a non-overexposed situation with a relatively high energy, recording the pixel code value, exposure time, and attenuation factor; then removing the attenuation factor and increasing the exposure time, so that the energy can be amplified by tens of thousands or even hundreds of thousands of times, thereby accurately obtaining clear ghost image, the energy of the pixel, and the energy of the ghost image. An overexposed image with a ghost image is as Figure 3 shown. The part circled in green in the figure is the ghost image.

[0048] Specifically, in this embodiment, the ghost image analysis method of the space telescope band-pass camera further includes the steps: S6. Use the experimental device to conduct a ghost image test experiment to obtain image data containing ghost images; collect ghost image information from the image data. The ghost image information includes the position, size, and energy information of the ghost image; substitute the ghost image information into the formula to verify or deduce the relevant information of the imaging system; specifically, a series of experimental devices can include a halogen light source, a 3m collimator, a highly sensitive six-degree-of-freedom adjustment stage, etc.; the experiment can obtain the ghost image information of a single light source in the test scene, but when the space telescope is launched into space, it faces a starry sky with thousands of light sources. What the ghost images formed by the bright stars in the field of view look like must be calculated through the various calculation processes provided by the present invention.

[0049] Specifically, in this embodiment, the ghost image analysis method for the space telescope band-pass camera further includes the steps: Correspondingly, according to an embodiment of the present invention, the present invention further provides a computer device, a readable storage medium, and a computer program product.

[0050] Figure 4 It is a schematic structural diagram of a computer device 12 provided in an embodiment of the present invention. Figure 4 It shows a block diagram of an exemplary computer device 12 suitable for implementing the embodiments of the present invention. Figure 4 The shown computer device 12 is merely an example and should not impose any limitation on the functions and usage scope of the embodiments of the present invention.

[0051] As Figure 4 shown, the computer device 12 is presented in the form of a general-purpose computing device. The computer device 12 is intended to represent various forms of digital computers, such as, a laptop computer, a desktop computer, a workbench, a personal digital assistant, a server, a blade server, a mainframe computer, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, a personal digital processor, a cellular phone, a smart phone, a wearable device, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0052] The components of the computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 connecting different system components (including the system memory 28 and the processing unit 16).

[0053] The bus 18 represents one or more of several types of bus structures, including a memory bus or a memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the multiple bus structures. By way of example, these architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.

[0054] The computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the computer device 12, including volatile and non-volatile media, removable and non-removable media.

[0055] System memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory (Cache) 32. Computer device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 34 may be used for reading and writing on non-removable, non-volatile magnetic media ( Figure 4 not shown, commonly referred to as a "hard disk drive"). Although Figure 4 not shown in the figure, a disk drive for reading and writing on removable non-volatile disks (such as "floppy disks") and an optical disk drive for reading and writing on removable non-volatile optical disks (such as CD-ROM, DVD-ROM or other optical media) may be provided. In these cases, each drive may be connected to bus 18 through one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of the present invention.

[0056] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28. Such program modules 42 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include the implementation of a network environment. Program modules 42 generally perform the functions and / or methods in the embodiments described in the present invention.

[0057] Computer device 12 may also communicate with one or more external devices 14 (such as a keyboard, a pointing device, a display 24, etc.), and may also communicate with one or more devices that enable a user to interact with the computer device 12, and / or communicate with any device that enables the computer device 12 to communicate with one or more other computing devices (such as a network card, a modem, etc.). Such communication may be carried out through an input / output (I / O) interface 22. Moreover, computer device 12 may also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN) and / or a public network, such as the Internet) through a network adapter 20. As shown in the figure, network adapter 20 communicates with other modules of computer device 12 through bus 18. It should be understood that although not shown in the figure, other hardware and / or software modules may be used in conjunction with computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0058] The processing unit 16 executes various functional applications and data processing by running the programs stored in the system memory 28, for example, implementing the ghost image analysis method of the space telescope band-pass camera provided in the embodiments of the present invention.

[0059] Embodiments of the present invention also provide a non-transitory computer-readable storage medium storing computer instructions, on which a computer program is stored. When the program is executed by a processor, it implements the ghost image analysis method of the space telescope band-pass camera provided in all embodiments of the present application.

[0060] The computer storage medium of the embodiments of the present invention can be any combination of one or more computer-readable media. The computer-readable media can be a computer-readable signal medium or a computer-readable storage medium. More specific examples (non-exhaustive list) of the computer-readable storage medium include: an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer-readable storage medium can be any tangible medium that contains or stores a program, which can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0061] The computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, which carries the computer-readable program code. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal medium can also be any computer-readable medium other than the computer-readable storage medium, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0062] The program code contained on a computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wire, optical fiber cable, RF, etc., or any suitable combination of the foregoing. The computer program code for performing the operations of the present invention can be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages - such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network including a local area network (LAN) or a wide area network (WAN), or, it can be connected to an external computer (e.g., by using an Internet service provider to connect through the Internet).

[0063] An embodiment of the present invention also provides a computer program product, including a computer program, which when executed by a processor implements the ghost image analysis method of the space telescope bandpass camera according to the above.

[0064] It should be understood that various forms of the processes shown above can be used, steps can be reordered, added or deleted. For example, the steps described in the disclosure of the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution disclosed in the present invention can be achieved. No limitation is imposed herein.

[0065] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for analyzing ghost images of a space telescope band-pass camera, characterized in that: The space telescope bandpass camera includes a filter and a detector. The ghost images of the space telescope bandpass camera include a first ghost image, a second ghost image, and a third ghost image. The first ghost image is formed by two reflections on the front surface and the back surface of the filter. The second ghost image is formed by two reflections on the back surface of the filter and the surface of the detector. The third ghost image is formed by two reflections on the front surface of the filter and the surface of the detector. The method for analyzing the ghost images of the space telescope bandpass camera includes the steps of: S1. Obtain the exit pupil diameter of the space telescope bandpass camera and the optical path distance from the exit pupil to the image plane, and then obtain the image-side aperture angle ; S2. Measure the transmittance and reflectance of the filter. The transmittance of the front surface of the filter is , the transmittance of the back surface of the filter is , the reflectance of the front surface of the filter is , and the reflectance of the back surface of the filter is ; S3. Measure the reflectivity of the detector, and the reflectivity of the surface of the detector is ; S4. Measure the thickness of the filter , measure the distance between the filter and the detector ; S5. Ghost image analysis is performed through the illuminance distribution function of the ghost image, and the illuminance distribution function is ; is the illuminance of the first ghost image, is the illuminance of the second ghost image, is the illuminance of the third ghost image; represents a disc function with as the center and as the radius; is the radius of the first ghost image, is the radius of the second ghost image, is the radius of the third ghost image.

2. The method for analyzing the ghost images of the space telescope bandpass camera according to claim 1, wherein: The total energy of the first ghost image is ; The total energy of the second ghost image is ; The total energy of the third ghost image is ; Among them, is the total energy of the incident light of the space telescope bandpass camera.

3. The method for analyzing the ghost images of the space telescope bandpass camera according to claim 2, wherein: The radius of the first ghost image is ; The radius of the first ghost image is ; The radius of the first ghost image is .

4. The method for analyzing the ghost images of the space telescope bandpass camera according to claim 3, wherein: The illuminance of the first ghost image is ; The illuminance of the second ghost image is ; The illuminance of the third ghost image is .

5. The method for analyzing the ghost images of the space telescope bandpass camera according to claim 4, wherein: The central coordinates of the first ghost image are ； The central coordinates of the second ghost image are ； The central coordinates of the third ghost image are 。 6. The ghost image analysis method of the space telescope band-pass camera according to claim 1, characterized in that: An antireflection film or a bandpass film is coated on the front surface of the filter, and an antireflection film or a bandpass film is coated on the back surface of the filter.

7. The ghost image analysis method of the space telescope band-pass camera according to claim 1, characterized in that: The method for analyzing the ghost images of the space telescope bandpass camera further includes the steps of: S6. Use an experimental device to conduct a ghost image test experiment to obtain image data containing ghost images. Collect ghost image information from the image data. The ghost image information includes the position, size, and energy information of the ghost image. Substitute the ghost image information into each calculation formula for verification or derivation.

8. A computer device, characterized in that, Including: At least one processor; And A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor. The instructions are executed by the at least one processor to enable the at least one processor to execute the method for analyzing the ghost images of the space telescope bandpass camera according to any one of claims 1 to 7.

9. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to execute the method for analyzing the ghost images of the space telescope bandpass camera according to any one of claims 1 to 7.

Images