An imaging system

Abstract

The present invention is applicable to the field of optical imaging and discloses an imaging system, including a first imaging unit, a second imaging unit coupled to the first imaging unit, and a driving mechanism. The driving mechanism is used to drive the first imaging unit to search for a wide range of targets to obtain a region of interest. The driving mechanism is also used to drive the second imaging unit to point to the position of a target to be measured based on the region of interest to detect the target to be measured. The imaging system couples the second imaging unit with the first imaging unit, and in cooperation with the driving mechanism, realizes detection of a large field of view through the first imaging unit, and then adjusts the second imaging unit to detect the target to be measured through the second imaging unit, thereby realizing a combination of general investigation and detailed investigation, and there is no need to re-position the region of interest, which is convenient to operate.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging, and in particular to an imaging system capable of combining general investigation with detailed investigation. Background Art

[0002] Existing imaging systems can usually only realize general survey or detailed survey, and have single functions. If general survey and detailed survey functions are required at the same time, two systems need to be combined, which is inconvenient to operate. Summary of the Invention

[0003] The present invention provides an imaging system, which aims to solve the technical problem in the prior art that imaging needs to realize general survey and detailed survey functions simultaneously, which requires the combination of two systems and is inconvenient to operate.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] An imaging system includes a first imaging unit, a second imaging unit coupled to the first imaging unit, and a driving mechanism, wherein the driving mechanism is used to drive the first imaging unit to search for a wide range of targets to obtain a region of interest, and the driving mechanism is further used to drive the second imaging unit to point to the position of a target to be measured based on the region of interest to detect the target to be measured.

[0006] Preferably, the first imaging unit includes a primary mirror, a secondary mirror and a camera arranged in sequence along the optical path. The light beam returned from the target is concentrated on the focal plane of the primary mirror, reflected by the primary mirror to the secondary mirror, and reflected by the secondary mirror to the camera, and formed by the camera. The second imaging unit is coupled to the primary mirror.

[0007] Preferably, the second imaging unit includes a microlens array, an optical fiber array and a photonic integrated device, the microlens array is used to collect light beams and couple them into the optical fiber array, the photonic integrated device is used to split and detect the light beams transmitted by the optical fiber array, the microlens array is arranged on the primary mirror, one end of the optical fiber array is connected to the microlens array, and the other end is connected to the photonic integrated device.

[0008] Preferably, the primary mirror is made of a flexible flat plate, the front end of the flexible flat plate is bent and split to form a plurality of ends with different inclination angles, and the plurality of microlenses of the microlens array are mounted on each of the ends in a one-to-one correspondence.

[0009] Preferably, the photonic integrated device includes a fiber array backplane for fixing the fiber array, a beam combiner for coupling the fiber array, a waveguide array grating connected to the beam combiner, and a detector array connected to the waveguide array grating.

[0010] Preferably, the mirror surface of the primary mirror is provided with an anti-reflection film covering a near-infrared band, and the beam synthesis device adopts a photon lantern.

[0011] Preferably, the optical fibers of the optical fiber array are multi-core optical fibers.

[0012] The imaging system provided by the present invention couples the second imaging unit with the first imaging unit, and realizes detection of a large field of view through the first imaging unit in cooperation with the driving mechanism, and then adjusts the second imaging unit to detect the target to be measured, thereby realizing the combination of general investigation and detailed investigation, and there is no need to re-position the area of ​​interest, which is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0014] Figure 1 is a schematic structural diagram of an imaging system provided by an embodiment of the present invention;

[0015] Figure 2 It is a partial schematic diagram of an imaging system provided by an embodiment of the present invention.

[0016] Description of Figure Numbers:

[0017] 10. First imaging unit; 11. Primary mirror; 111. End; 12. Secondary mirror; 13. Camera; 20. Second imaging unit; 21. Microlens array; 22. Optical fiber array; 23. Photonic integrated device. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0019] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0020] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0021] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] like Figures 1 to 2 As shown, it is an imaging system of an embodiment of the present invention, which can realize the combination of general inspection and detailed inspection.

[0023] See also Figure 1 and Figure 2 The imaging system of the embodiment of the present invention includes a first imaging unit 10, a second imaging unit 20 coupled to the first imaging unit 10, and a driving mechanism (not shown). The driving mechanism is used to drive the first imaging unit 10 to search for a wide range of targets to obtain a region of interest. The driving mechanism is also used to drive the second imaging unit 20 to point to the position of the target to be measured according to the region of interest so as to detect the target to be measured.

[0024] The imaging system of the embodiment of the present invention couples the second imaging unit 20 with the first imaging unit 10, and realizes detection of a large field of view through the first imaging unit 10 in cooperation with the driving mechanism, and then adjusts the second imaging unit 20 to detect the target to be measured through the second imaging unit 20, thereby realizing the combination of general investigation and detailed investigation, and there is no need to re-position the area of ​​interest, which is convenient to operate.

[0025] Exemplarily, in some embodiments, the first imaging unit 10 includes a primary mirror 11, a secondary mirror 12 and a camera 13 arranged in sequence along the optical path. The light beam returned from the target is concentrated on the focal plane of the primary mirror 11, reflected by the primary mirror 11 to the secondary mirror 12, and reflected by the secondary mirror 12 to the camera 13, and imaged by the camera 13. The second imaging unit 20 includes a microlens array 21, an optical fiber array 22 and a photonic integrated device 23. The microlens array 21 is arranged on the primary mirror 11, one end of the optical fiber array 22 is connected to the microlens array 21, and the other end is connected to the photonic integrated device 23. The microlens array 21 is used to collect light beams and couple them into the optical fiber array 22. The photonic integrated device 23 is used to split and detect the light beams transmitted by the optical fiber array 22. By setting the microlens array 21 of the second imaging unit 20 on the first imaging unit 10, the position of the second imaging unit 20 can be adjusted by driving the first imaging unit 10, without the need to reposition the area of ​​interest, which is conducive to the combination of general survey and detailed survey. Furthermore, the second imaging unit 20 utilizes a microlens array 21 to form an interferometer array, employing a specific interferometric baseline connection sequence to establish a new direct imaging mechanism. Due to system occlusion, the detection center position will be partially missing. Therefore, during the subsequent baseline setting process, it is necessary to set additional baselines for low-frequency components to ensure the second imaging unit 20's resolution at each frequency component.

[0026] Optionally, the optical fibers of the optical fiber array 22 are multi-core optical fibers.

[0027] For example, in certain embodiments, the primary mirror 11 is fabricated from a flexible flat plate. The front end of the flexible plate is bent and split to form multiple ends 111 with varying inclination angles. The multiple microlenses of the microlens array 21 are mounted one-to-one on each end 111. During fabrication, the flexibility of the flexible plate is utilized to bend the plate by applying a torque. During the bending process, the incident direction of the optical fiber array 22 and the microlens array 21 can be adjusted, thereby expanding the field of view of the second imaging unit 20. Specifically, the flexible plate can be used to switch between different observation states. In view of the small field of view of the interferometric system, the deformation of the flexible plate can be used to splice the fields of view at different positions, ultimately achieving wide-range detection.

[0028] It can be understood that the photonic integrated device 23 can replace the mechanical galvanometer used in traditional narrow field of view systems, reducing system motion blur while also improving the stability and robustness of the system's electromechanical architecture. For example, in some embodiments, the photonic integrated device 23 includes a fiber array backplane (not shown) for fixing the fiber array 22, a beam combiner (not shown) for coupling the fiber array 22, a waveguide array grating (not shown) connected to the beam combiner, and a detector array (not shown) connected to the waveguide array grating. Channel spectral analysis is achieved by arranging the waveguide array grating and the detector array.

[0029] For example, in some embodiments, the primary mirror 11 is coated with an antireflection coating covering the near-infrared band. Therefore, a photon lantern can be used as a beam combining device, enabling light interference in complex scenarios and extreme conditions, ultimately enabling wavefront sensing. Regarding wavefront sensing, experiments or simulations can be conducted for different forms of aberrations beforehand, and machine learning methods can be used to map these aberrations. Finally, the system can be adjusted iteratively.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An imaging system, characterized in that: The system comprises a first imaging unit, a second imaging unit coupled to the first imaging unit, and a driving mechanism, wherein the driving mechanism is used to drive the first imaging unit to search for a wide range of targets to obtain a region of interest, and the driving mechanism is further used to drive the second imaging unit to point to a position of a target to be measured according to the region of interest to detect the target to be measured; The first imaging unit includes a primary mirror, a secondary mirror, and a camera arranged in sequence along the optical path. The light beam returning from the target is focused on the focal plane of the primary mirror, reflected by the primary mirror to the secondary mirror, and then reflected by the secondary mirror to the camera, and an image is formed by the camera. The second imaging unit is coupled to the primary mirror. The second imaging unit includes a microlens array, an optical fiber array and a photonic integrated device. The microlens array is used to collect light beams and couple them into the optical fiber array. The photonic integrated device is used to split and detect the light beams transmitted by the optical fiber array. The microlens array is arranged on the primary mirror. One end of the optical fiber array is connected to the microlens array, and the other end is connected to the photonic integrated device.

2. The imaging system according to claim 1, wherein The primary mirror is made of a flexible flat plate, the front end of which is bent and split to form multiple ends with different inclination angles, and the multiple microlenses of the microlens array are mounted on each of the ends in a one-to-one correspondence.

3. The imaging system according to claim 1, wherein The photonic integrated device includes a fiber array backplane for fixing the fiber array, a beam combiner for coupling the fiber array, a waveguide array grating connected to the beam combiner, and a detector array connected to the waveguide array grating.

4. The imaging system according to claim 3, wherein: The mirror surface of the primary mirror is provided with an anti-reflection film covering a near-infrared band, and the beam synthesis device adopts a photon lantern.

5. The imaging system according to claim 1, wherein The optical fibers of the optical fiber array are multi-core optical fibers.

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