A method for precise assembly and adjustment of the follow-up group and detector in a field-of-view secondary imaging system

Abstract

This method for assembling and adjusting the relay group and detector in a field-of-view secondary imaging system belongs to the field of optical system technology. To address the difficulty in visualizing and quantitatively adjusting the detector's pose during the installation of the relay group and detector in existing multi-stage complex imaging optical systems, this method includes the following steps: Step 1, Installing the simulator: Install the simulator at the primary image plane position of the shared imaging front group; Step 2, Fixing the light source: Fix the auxiliary light source directly in front of the simulator to uniformly illuminate the entire simulator surface; Step 3, Adjusting the light source: Adjust the brightness and illumination angle of the auxiliary light source to ensure that the four light-transmitting apertures and the light-transmitting crosshairs can be clearly imaged onto the detector through the field-of-view relay group; Step 4, Adjusting the axial position of the detector; Step 5, Adjusting the rotation of the detector; Step 6, Adjusting the translation of the detector. This method achieves both visual and quantitative assembly and adjustment.

Description

Technical Field

[0001] This invention belongs to the field of optical system technology and relates to the assembly and adjustment method of the follower group and detector in a field-of-view secondary imaging system. Background Technology

[0002] In the engineering practice of field-of-view secondary imaging systems, system imaging quality has become an industry consensus as the final evaluation benchmark. The precise assembly and adjustment process is one of the crucial guarantees of its imaging quality. However, current assembly and adjustment methods still have certain technical bottlenecks: actual operation still relies heavily on subjective, experience-based adjustments, lacking quantitative feedback on the assembly and adjustment process. The final imaging quality can only serve as a verification reference, making it difficult to achieve precise visual control in intermediate stages. For example, for multi-level complex imaging optical systems with strict pose constraints, such as light field cameras and compound eye systems, the adjustment process is extremely cumbersome, and the precise assembly and adjustment of the axial position and pose of the relay group and detector face significant challenges.

[0003] The assembly and adjustment process is particularly complex for multi-stage optical systems with strict sub-aperture pose constraints and multiple relay imaging. Precise assembly and adjustment of the axial position and six-degree-of-freedom pose of the relay lens group and the detector array on the final image plane present significant challenges. See the article "Structure and Assembly Method of Field-Stabilized Compound Eye Imaging System" published by Dong Zhengchao et al. in the *Acta Photonica Sinica*. This method uses two theodolites with built-in auxiliary light sources to align with each other, providing a reference method for the assembly and adjustment of such complex imaging systems. However, when multiple detectors with split fields of view are installed on the image plane after multiple relays, the detectors need to occupy positions on the image plane. At this point, the theodolite cannot remain in its original position for testing and guidance, thus losing the ability to provide visual alignment guidance and quantitative assessment of assembly and adjustment errors in the most critical step of final image plane installation. Summary of the Invention

[0004] In order to solve the problem of difficulty in visualizing and quantifying the detector pose during the installation of the relay group and detector in the existing multi-level complex imaging optical system, this invention proposes an auxiliary precision installation and adjustment method for the relay group and detector in a field-of-view secondary imaging system.

[0005] The technical solution of this invention to solve the technical problem is as follows:

[0006] A method for assisting in the precision assembly and adjustment of the follow-up group detector in a field-of-view secondary imaging system, the method comprising the following steps:

[0007] Step 1, Install the emulator:

[0008] Install the simulator at the primary image plane position of the shared imaging front group;

[0009] Step 2, Fix the light source:

[0010] Fix the auxiliary light source directly in front of the simulator so that it can evenly illuminate the entire surface of the simulator.

[0011] Step 3, adjust the light source:

[0012] Adjust the brightness and illumination angle of the auxiliary light source to ensure that the four light-transmitting holes and the light-transmitting crosshairs can be clearly imaged onto the detector after the field-of-view relay group.

[0013] Step 4, adjust the axial position of detector one:

[0014] The simulator is illuminated by an auxiliary light source. The axial position of detector one is continuously moved to test the imaging effect of the four light-transmitting holes on detector one. When the image is clear, the axial position of the detector is adjusted to fix detector one in the image plane position.

[0015] Step 5, adjust the rotation of detector one:

[0016] The simulator is illuminated by an auxiliary light source. The crosshairs on the simulator are imaged on detector one. The vertical and horizontal pixel position deviations along the horizontal direction and the vertical and horizontal position deviations of the image are used to quantitatively provide feedback on the adjustment direction and amount of the detector's orientation rotation. When the vertical and horizontal pixel position deviations along the horizontal direction and the vertical and horizontal position deviations of the image are no longer deviations, the rotation adjustment of detector one can be considered complete.

[0017] Step 6, adjust the translation of detector one:

[0018] The simulator is illuminated by an auxiliary light source, and the crosshairs on the simulator are imaged on detector one. Based on step 5, the direction and amount of the detector's one-position translation are adjusted by the deviation of the image relative to the center position. When the deviation of the image relative to the center position is zero, the translation adjustment of detector one can be considered complete.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. The simulator ensures the precise alignment of the position and orientation of each relay group of detectors.

[0021] 2. The light-transmitting aperture and crosshair on the simulator image on each relay group of detectors. By observing the imaging position and imaging clarity, the axial adjustment direction of the detector can be guided in real time.

[0022] 3. The translucent crosshair on the simulator images on each relay group of detectors. By measuring the deviation of the translucent crosshair image on the detector relative to the center position, the direction and amount of adjustment for the detector pose translation are quantitatively fed back. By measuring the deviation of the high and low pixel positions along the horizontal direction and the left and right position deviation along the vertical direction of the translucent crosshair image on the detector, the direction and amount of adjustment for the detector pose rotation are quantitatively fed back. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the field-of-view secondary imaging system of the present invention;

[0024] Figure 2 This is a simulator diagram of the auxiliary precision assembly and adjustment method for the follow-up group detector in the field-of-view secondary imaging system of the present invention;

[0025] Figure 3 This is a simulator illumination diagram for the precision assembly and adjustment method of the follow-up group detector in the field-of-view secondary imaging system of the present invention.

[0026] Figure 4 This is a diagram showing the axial position adjustment of the detector in an embodiment of the auxiliary precision assembly and adjustment method for the subsequent group detector in the field-of-view secondary imaging system of the present invention.

[0027] Figure 5 This is a diagram showing the translation and rotation adjustment of the detector in an embodiment of the auxiliary precision assembly and adjustment method for the subsequent group detector in the field-of-view secondary imaging system of the present invention.

[0028] Figure 6a shows the image of the translucent crosshair on the simulator on each of the intermediate relay detectors in an embodiment of the precision assembly and adjustment method for the relay detectors in the field-of-view secondary imaging system of the present invention; Figure 6b shows the rotational adjustment diagram of the image of the translucent crosshair on the simulator on each of the intermediate relay detectors in an embodiment of the precision assembly and adjustment method for the relay detectors in the field-of-view secondary imaging system of the present invention; Figure 6c shows the translational adjustment diagram of the image of the translucent crosshair on the simulator on each of the intermediate relay detectors in an embodiment of the precision assembly and adjustment method for the relay detectors in the field-of-view secondary imaging system of the present invention.

[0029] The components include: 1. Shared imaging front group; 2. Simulator; 2-1. Screw hole; 2-2. Light-transmitting small hole; 2-3. Light-transmitting crosshair; 3. Field-of-view relay rear group; 3-1. Field-of-view relay rear group one; 3-2. Field-of-view relay rear group two; 3-3. Field-of-view relay rear group three; 4. Detector; 4-1. Detector one; 4-2. Detector two; 4-3. Detector three; 5. Auxiliary light source. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 As shown, the method of this invention is based on a field-of-view secondary imaging system, which includes a shared pre-imaging group 1, three field-of-view relay groups 3, and three detectors 4. The three field-of-view relay groups 3 are Field-of-view relay group one 3-1, Field-of-view relay group two 3-2, and Field-of-view relay group three 3-3. The three detectors 4 are detector one 4-1, detector two 4-2, and detector three 4-3.

[0032] The three sub-field repeater groups 3, namely sub-field repeater group 1 3-1, sub-field repeater group 2 3-2, and sub-field repeater group 3-3, have the same structure, each consisting of a convex lens, a cemented doublet lens, a concave lens, a cemented doublet lens, and a convex lens arranged coaxially in sequence.

[0033] The shared imaging front group 1 images the object onto the primary image plane.

[0034] The three sub-field relay groups 3 perform field-of-view segmentation on the primary image plane, and the three sub-field relay groups 3 then perform secondary imaging of the segmented independent fields of view onto the corresponding three detectors 4.

[0035] When the subsequent detectors in the split-view secondary imaging system are used for precision assembly and adjustment, the simulator 2 is placed at the primary image plane.

[0036] like Figure 2 As shown, the simulator 2 includes four screw holes 2-1, twelve light-transmitting holes 2-2, and three light-transmitting cross lines 2-3.

[0037] The base curvature radius of the simulator 2 is designed according to the residual field curvature parameters of the common imaging pre-group 1, and its curvature characteristics and spatial position are the same as those of the primary image plane of the optical system.

[0038] The screw holes 2-1 are located at the four corners of the simulator 2 and are used for fixed connection with the repeater group 3 in the field of view.

[0039] The twelve light-transmitting holes 2-2 are respectively arranged at the four corners of the three detectors 4 to ensure coverage of each sub-field of view.

[0040] The three light-transmitting crosshairs 2-3 are engraved at the image height of each sub-field of view to facilitate the calibration and alignment of the imaging position.

[0041] This invention discloses a method for assisting in the precise assembly and adjustment of subsequent detectors in a field-of-view secondary imaging system. Taking detector 4-1 as an example, the method is described below. Detectors 4-2 and 4-3 are also assembled and adjusted using the same method. This method includes the following steps:

[0042] Step 1, Install the emulator:

[0043] See Figure 1 Simulator 2 is installed at the primary image plane position of the shared imaging front group 1.

[0044] Step 2, Fix the light source:

[0045] See Figure 3 The auxiliary light source 5 is fixed in front of the simulator 2 so that it can evenly illuminate the entire surface of the simulator 2.

[0046] Step 3, adjust the light source:

[0047] See Figure 3 Adjust the brightness and illumination angle of the auxiliary light source 5 to ensure that the four light-transmitting holes 2-2 and the light-transmitting crosshairs 2-3 can be clearly imaged onto the detector 4-1 through the field-of-view relay group 3-1.

[0048] Step 4, adjust the axial position of detector 4-1:

[0049] See Figure 4 The simulator 2 is illuminated by an auxiliary light source 5. The axial position of the detector 4-1 is continuously moved to test the imaging effect of the four light-transmitting holes 2-2 on the detector 4-1. When the image is clear, the axial position of the detector 4-1 is adjusted to fix the detector 4-1 in the image plane position.

[0050] Step 5, adjust the rotation of detector 4-1:

[0051] See Figure 5 The simulator 2 is illuminated using an auxiliary light source 5. The light-transmitting crosshairs 2-3 on the simulator 2 are imaged on the detector 4-1. (See attached image.) Figure 6 a. By imaging the detector-4-1 through the light-transmitting crosshairs 2-3, the high and low pixel position deviations in the horizontal direction and the left and right position deviations in the vertical direction along the detector-4-1 are used to quantitatively provide feedback on the adjustment direction and amount of the detector-4-1's pose rotation. When adjusted to... Figure 6 When b is reached, the rotation adjustment of detector 4-1 can be considered complete.

[0052] Step 6, adjust the translation of detector 4-1:

[0053] See Figure 5 The simulator 2 is illuminated using an auxiliary light source 5. The translucent crosshairs 2-3 on the simulator 2 image onto the relay detector 4-1. Based on step 5, the direction and amount of the pose translation of detector 4-1 are adjusted according to the deviation of the image of the translucent crosshairs 2-3 on detector 4-1 relative to the center position. When adjusted to... Figure 6 When c, the translation adjustment of detector 4-1 can be considered complete.

[0054] At this point, the position and orientation adjustment of detector 4-1 is completed, ensuring the precise assembly and adjustment of detector 4-1 in the optical system.

[0055] In summary, this invention provides a solution for the assembly and adjustment of the follow-up detector in a secondary imaging system. It not only addresses the challenges of existing technologies, such as lack of visualization, absence of quantitative feedback, and disconnect between testing feedback and assembly / adjustment, but also offers a new approach and technical means for the efficient debugging of field-of-view secondary imaging optical systems. This innovative design provides a precise assembly and adjustment method for secondary imaging systems, achieving visualization of the assembly and adjustment process and effectively avoiding the impact of inaccurate detector position and pose on imaging quality, which is of great significance for improving the imaging quality of secondary imaging systems. The application of this invention is expected to significantly improve the performance of such optical systems, with broad application prospects and market potential. This method provides a new solution for the assembly and adjustment of optical systems and has broad application prospects.

Claims

1. A method for assisting precise assembly and adjustment of a relayed rear group detector in a split-field secondary imaging system, characterized in that the method is based on a split-field secondary imaging system, which comprises a common imaging front group (1), three split-field relayed rear groups (3), and three detectors (4), the common imaging front group (1) images an object onto a primary image plane, the three split-field relayed rear groups (3) split the field of view of the primary image plane, and the three split-field relayed rear groups (3) image the split independent fields of view onto corresponding detectors (4), when the split-field secondary imaging system relayed rear group detector is assisted in precise assembly and adjustment, a simulator (2) is placed at the primary image plane; the simulator (2) comprises four screw holes (2-1), twelve light transmission small holes (2-2), and three light transmission cross lines (2-3); the base curvature radius of the simulator (2) is designed according to the residual field curvature parameters of the common imaging front group (1), and the bending characteristics and spatial positions thereof are the same as those of the primary image plane of the optical system; the screw holes (2-1) are distributed at the four corners of the simulator (2) and are used for fixed connection with the split-field relayed rear group (3); the twelve light transmission small holes (2-2) are respectively arranged at the four corners of the three detectors (4) to ensure coverage of each split field; the three light transmission cross lines (2-3) are marked according to the image height of the primary image plane of each split field to facilitate calibration and alignment of the imaging position; the method comprises the following steps: Step 1: installing the simulator; install the simulator (2) at the primary image plane position of the common imaging front group (1); Step 2: fixing the light source; fix the auxiliary light source (5) in front of the simulator (2) so that it can uniformly irradiate the entire surface of the simulator (2); Step 3: adjusting the light source; adjust the brightness and irradiation angle of the auxiliary light source (5) to ensure that the four light transmission small holes (2-2) and the light transmission cross lines (2-3) can be clearly imaged on the detector one (4-1) through the split-field relayed rear group one (3-1); Step 4: adjusting the axial position of the detector one (4-1); use the auxiliary light source (5) to illuminate the simulator (2), and continuously move the axial position of the detector one (4-1) to test the imaging effect of the four light transmission small holes (2-2) on the detector one (4-1), when the imaging is clear, the axial position of the detector one (4-1) is adjusted, and the detector one (4-1) is fixed at the image plane position; Step 5: adjusting the rotation of the detector one (4-1); use the auxiliary light source (5) to illuminate the simulator (2), and the light transmission cross lines (2-3) on the simulator (2) are imaged on the detector one (4-1), through the imaging along the high-low pixel position deviation of the detector one (4-1) in the horizontal direction and the left-right position deviation in the vertical direction, the adjustment direction and adjustment amount of the pose rotation of the detector one (4-1) are quantitatively fed back, when the adjustment is that the imaging along the high-low pixel position deviation of the detector one (4-1) in the horizontal direction and the left-right position deviation in the vertical direction is no deviation, it is considered that the rotation adjustment of the detector one (4-1) is completed; Step 6: adjusting the translation of the detector one (4-1); ​ The simulator (2) is illuminated by using an auxiliary light source (5), and a light-transmitting cross line (2-3) on the simulator (2) is imaged on a detector (4-1); on the basis of step 5, the adjustment direction and adjustment amount of the pose translation of the detector (4-1) are adjusted through the deviation of the imaging relative to the central position; when the deviation of the imaging relative to the central position is adjusted to zero, it is considered that the translation adjustment of the detector (4-1) is completed.

2. The method of claim 1, wherein the method is used in a subfield imaging relay system. The three sub-field relay rear groups (3) are a sub-field relay rear group one (3-1), a sub-field relay rear group two (3-2) and a sub-field relay rear group three (3-3); the three detectors (4) are a detector one (4-1), a detector two (4-2) and a detector three (4-3); the detector two (4-2) and the detector three (4-3) are precisely assembled and adjusted by using the same method as the detector one (4-1).

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