Optimal spectral channel design method for photonic integrated interferometric imaging system
By analyzing the spectral distribution of the target under test, the spectral channel design of the photonic integrated interferometric imaging system was optimized, solving the redundancy problem in traditional designs and achieving efficient spectral channel design and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
- Filing Date
- 2024-07-05
- Publication Date
- 2026-07-24
AI Technical Summary
Existing photonic integrated interferometric imaging systems fail to consider the detection characteristics of the interferometric array and the spectral distribution characteristics of the target when designing the optimal spectral channel, resulting in high design difficulty and demanding process requirements.
By analyzing the spectral distribution of the target under test, an interferometric array is designed, the number of spectral channels and the initial spectral sampling interval are set, and inverse Fourier transform and normalization are performed to optimize the spectral channel design until the optimal spectral channels are obtained.
This improves the design efficiency of photonic integrated interferometric imaging systems, reduces manufacturing costs, and enables optimized design for the spectral distribution of different targets.
Smart Images
Figure CN118550081B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of photonic integrated interferometric imaging technology, and particularly relates to an optimal spectral channel design method for a photonic integrated interferometric imaging system. Background Technology
[0002] Existing photonic integrated interferometry imaging systems use the number of spectral channels as the evaluation criterion for designing the optimal spectral channels of the system. That is, the more spectral channels there are, the better the spectral channels of the photonic integrated interferometry imaging system. However, this design criterion does not take into account the detection characteristics of the interferometric array and the spectral distribution characteristics of the target under test. Therefore, the traditional optimal spectral channel design method for photonic integrated interferometry imaging systems is not only difficult to design, but also has high requirements for manufacturing processes. Summary of the Invention
[0003] In view of this, the present invention aims to provide an optimal spectral channel design method for a photonic integrated interferometric imaging system, so as to solve the problem of spectral channel design redundancy in existing optimal spectral channel design methods for photonic integrated interferometric imaging systems, and effectively improve the design efficiency of photonic integrated interferometric imaging systems.
[0004] To achieve the above objectives, the technical solution created by this invention is implemented as follows: An optimal spectral channel design method for a photonic integrated interferometric imaging system includes the following steps: S1: Design the interferometric array of the photonic integrated interferometric imaging system based on the spectral distribution of the target under test; S2: Based on the number of spectral acquisitions of the target under test by each interference baseline of the interferometric array, set the number of spectral channels and the initial spectral sampling interval of the photonic integrated interferometric imaging system; S3: Based on the initial spectral sampling interval, set no less than two spectral sampling intervals. According to all the spectral sampling intervals, use the set spectral channels of the photon integrated interferometric imaging system to sample the spectrum of the target under test, and perform inverse Fourier transform on the spectral distribution of the target under test obtained by sampling to obtain the reconstructed image corresponding to each spectral sampling interval. S4: Normalize all reconstructed images sequentially to obtain each normalized reconstructed image and its normalized mean square error and normalized peak signal-to-noise ratio; S5: Determine if there is a normalized reconstructed image with a minimum normalized mean square error and a maximum normalized peak signal-to-noise ratio. If so, use the spectral sampling interval corresponding to the normalized reconstructed image as the optimal sampling interval of the photonic integrated interferometric imaging system to obtain the optimal spectral channel of the photonic integrated interferometric imaging system. Otherwise, adjust the number of spectral channels and the spectral sampling interval of the photonic integrated interferometric imaging system, and repeat steps S3-S5 until the optimal spectral channel of the photonic integrated interferometric imaging system is obtained.
[0005] Furthermore, in step S1, based on the spectral distribution of the target under test, the number of interferometer arms of the interferometer array, the number of sub-apertures on a single interferometer arm, and the maximum baseline length of the interferometer array are designed accordingly.
[0006] Furthermore, in step S2, the number of spectral acquisitions of the target under test by each interference baseline of the interference array is equal to the number of spectral channels set by the photonic integrated interferometric imaging system.
[0007] Furthermore, in step S2, the product of the number of spectral channels of the photonic integrated interferometric imaging system and the initial spectral sampling interval is equal to the bandwidth value of the photonic integrated interferometric chip of the photonic integrated interferometric imaging system.
[0008] Furthermore, in step S3, the difference between adjacent spectral sampling intervals is greater than or equal to 5 nm, and the larger the bandwidth value of the photonic integrated interference chip, the larger the difference between adjacent spectral sampling intervals.
[0009] Compared with the prior art, the present invention can achieve the following beneficial effects: This invention presents an optimal spectral channel design method for a photonic integrated interferometric imaging system. By analyzing the spectral distribution of the target under test, the method enables the corresponding design of the interferometric array of the photonic integrated interferometric imaging system. Specifically, the interferometric array is adjusted according to the low, medium, and high frequency distribution of the target under test to optimize the number of channels. This allows the photonic integrated interferometric imaging system to address the redundancy problem in traditional spectral channel design by designing corresponding interferometric arrays for different target spectral distributions. This invention improves the design efficiency of the photonic integrated interferometric imaging system and reduces its manufacturing cost. Attached Figure Description
[0010] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A flowchart illustrating the optimal spectral channel design method for the photonic integrated interferometric imaging system described in the embodiments of the present invention; Figure 2To create an image of the target to be tested as described in the embodiments of the present invention; Figure 3 A schematic diagram of the spectral distribution of the target under test as described in the embodiments of the present invention; Figure 4 A schematic diagram of the arrangement of the interference array described in the embodiment of the present invention; Figure 5 This is a schematic diagram showing the relationship between the normalized mean square error and the normalized peak signal-to-noise ratio obtained by acquiring the spectrum of the target under test using an interferometric array, as described in an embodiment of the present invention. Detailed Implementation
[0011] To make the objectives, technical solutions, and advantages of this invention clearer, the 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 merely illustrative of the invention and do not constitute a limitation thereof.
[0012] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.
[0013] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.
[0014] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0016] like Figure 1 As shown, the present invention provides an optimal spectral channel design method for a photonic integrated interferometric imaging system, which specifically includes the following steps: S1: Design the interferometric array of the photonic integrated interferometric imaging system based on the spectral distribution of the target to be measured.
[0017] In the spectral distribution of the target under test, the proportions of low-frequency, mid-frequency, and high-frequency distributions are different.
[0018] Based on the spectral distribution of the target under test, the number of interferometer arms, the number of sub-apertures on a single interferometer arm, and the maximum baseline length of the interferometer array are designed accordingly.
[0019] S2: Based on the number of spectrum acquisitions of the target under test by each interference baseline of the interferometric array, set the number of spectral channels and the initial spectral sampling interval of the photonic integrated interferometric imaging system.
[0020] In step S2, the product of the number of spectral channels in the photonic integrated interferometry imaging system and the initial spectral sampling interval is equal to the bandwidth value of the photonic integrated interferometer chip in the photonic integrated interferometry imaging system.
[0021] In step S2, the number of spectral acquisitions of the target under test by each interference baseline of the interferometric array is equal to the number of spectral channels set by the photonic integrated interferometric imaging system.
[0022] S3: Based on the initial spectral sampling interval, set no less than two spectral sampling intervals. According to all the spectral sampling intervals, use the set spectral channels of the photonic integrated interferometric imaging system to sample the spectrum of the target under test, and perform inverse Fourier transform on the spectral distribution of the target under test obtained by sampling one by one to obtain the reconstructed image corresponding to each spectral sampling interval.
[0023] In step S3, the difference between adjacent spectral sampling intervals is greater than or equal to 5 nm, and the larger the bandwidth value of the photonic integrated interference chip, the larger the difference between adjacent spectral sampling intervals.
[0024] S4: Normalize all reconstructed images sequentially to obtain each normalized reconstructed image and its normalized mean square error and normalized peak signal-to-noise ratio.
[0025] S5: Determine if there is a normalized reconstructed image with a minimum normalized mean square error and a maximum normalized peak signal-to-noise ratio. If so, use the spectral sampling interval corresponding to the normalized reconstructed image as the optimal sampling interval of the photonic integrated interferometric imaging system to obtain the optimal spectral channel of the photonic integrated interferometric imaging system. Otherwise, adjust the number of spectral channels and the spectral sampling interval of the photonic integrated interferometric imaging system, and repeat steps S3-S5 until the optimal spectral channel of the photonic integrated interferometric imaging system is obtained.
[0026] Example 1 The following is a detailed description of the specific process for designing the optimal spectral channel of a photonic integrated interferometric imaging system. The image of the target under test is shown below. Figure 2 As shown, the spectral distribution of the target under test is as follows: Figure 3 As shown, the bandwidth of the photonic integrated interference chip here is 400nm.
[0027] S1: Design the interferometric array of the photonic integrated interferometric imaging system based on the spectral distribution of the target to be measured.
[0028] In step S1, under complex scenarios, the proportions of low-frequency, mid-frequency, and high-frequency distributions in the spectrum distribution of the target under test are different.
[0029] In step S1, based on the spectral distribution of the target under test, the number of interferometer arms of the interferometer array, the number of sub-apertures on a single interferometer arm, and the maximum baseline length of the interferometer array are designed accordingly.
[0030] The designed arrangement of the interference array is as follows: Figure 4 As shown, the interference array is configured as follows: the number of sub-apertures on a single interference arm is 100, the number of interference arms is 49, and the maximum baseline length is 39cm.
[0031] S2: Based on the number of spectrum acquisitions of the target under test by each interference baseline of the interferometric array, set the number of spectral channels and the initial spectral sampling interval of the photonic integrated interferometric imaging system.
[0032] The number of spectrum acquisitions of the target under test by each interference baseline of the interferometric array is 80. Therefore, the number of spectral channels of the photonic integrated interferometric imaging system is 80, and the initial spectral sampling interval of the photonic integrated interferometric imaging system is 5 nm.
[0033] In step S2, the product of the number of spectral channels and the spectral sampling interval of the photonic integrated interferometry imaging system is equal to the bandwidth value of the photonic integrated interferometer chip of the photonic integrated interferometry imaging system.
[0034] In step S2, the number of spectral acquisitions of the target under test by each interference baseline of the interferometric array is equal to the number of spectral channels set by the photonic integrated interferometric imaging system.
[0035] S3: Based on the initial spectral sampling interval, set no less than two spectral sampling intervals. According to all the spectral sampling intervals, use the set spectral channels of the photonic integrated interferometric imaging system to sample the spectrum of the target under test, and perform inverse Fourier transform on the spectral distribution of the target under test obtained by sampling one by one to obtain the reconstructed image corresponding to each spectral sampling interval.
[0036] In step S3, the difference between adjacent spectral sampling intervals is greater than or equal to 5 nm, and the larger the bandwidth value of the photonic integrated interference chip, the larger the difference between adjacent spectral sampling intervals.
[0037] S4: Normalize all reconstructed images sequentially to obtain each normalized reconstructed image and its normalized mean square error and normalized peak signal-to-noise ratio.
[0038] S5: Determine if there is a normalized reconstructed image with a minimum normalized mean square error and a maximum normalized peak signal-to-noise ratio. If so, use the spectral sampling interval corresponding to the normalized reconstructed image as the optimal sampling interval of the photonic integrated interferometric imaging system to obtain the optimal spectral channel of the photonic integrated interferometric imaging system. Otherwise, adjust the number of spectral channels and the spectral sampling interval of the photonic integrated interferometric imaging system, and repeat steps S3-S5 until the optimal spectral channel of the photonic integrated interferometric imaging system is obtained.
[0039] In this example, the spectral sampling intervals are sequentially set to 5nm, 10nm, 15nm, 20nm, 25nm, 40nm, and 50nm, resulting in the following: Figure 5 The curves showing the relationship between normalized mean square error and normalized peak signal-to-noise ratio obtained by acquiring the spectrum of the target under test using an interferometric array are as follows: Figure 5 The curves show that when the spectral sampling interval is 15 nm, the normalized mean square error (N-MSE) is at its minimum, and the normalized peak signal-to-noise ratio (N-PSNR) is at its maximum, which is when the number of spectral channels is approximately 26 (400 nm). 15nm = 26.6666…), which is the optimal spectral channel for the photonic integrated interferometric imaging system.
[0040] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this invention disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this invention can be achieved, and this is not limited herein.
[0041] The specific embodiments described above do not constitute a limitation on the scope of protection of this 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 this invention should be included within the scope of protection of this invention.
Claims
1. A method for designing the optimal spectral channel of a photonic integrated interferometric imaging system, characterized in that: Specifically, the steps include the following: S1: Design the interferometric array of the photonic integrated interferometric imaging system based on the spectral distribution of the target to be measured; In the spectral distribution of the target under test, the proportions of low-frequency, mid-frequency, and high-frequency distributions are different; S2: Based on the number of spectral acquisitions of the target under test by each interference baseline of the interference array, set the number of spectral channels and the initial spectral sampling interval of the photonic integrated interferometric imaging system; S3: Based on the initial spectral sampling interval, set no less than two spectral sampling intervals. According to all the spectral sampling intervals, use the set spectral channels of the photon integrated interferometric imaging system to sample the spectrum of the target under test, and perform inverse Fourier transform on the spectral distribution of the target under test obtained by sampling to obtain the reconstructed image corresponding to each spectral sampling interval. S4: Normalize all reconstructed images sequentially to obtain each normalized reconstructed image and its normalized mean square error and normalized peak signal-to-noise ratio; S5: Determine whether there exists a normalized reconstructed image with a minimum normalized mean square error and a maximum normalized peak signal-to-noise ratio. If so, use the spectral sampling interval corresponding to the normalized reconstructed image as the optimal sampling interval of the photonic integrated interferometric imaging system to obtain the optimal spectral channel of the photonic integrated interferometric imaging system. Otherwise, adjust the number of spectral channels and the spectral sampling interval of the photonic integrated interferometric imaging system, and repeat steps S3-S5 until the optimal spectral channel of the photonic integrated interferometric imaging system is obtained.
2. The optimal spectral channel design method for the photonic integrated interferometric imaging system according to claim 1, characterized in that: In step S1, the number of interferometer arms, the number of sub-apertures on a single interferometer arm, and the maximum baseline length of the interferometer array are designed according to the spectral distribution of the target under test.
3. The optimal spectral channel design method for the photonic integrated interferometric imaging system according to claim 1, characterized in that: In step S2, the number of spectral acquisitions of the target by each interference baseline of the interference array is equal to the number of spectral channels set by the photonic integrated interferometric imaging system.
4. The optimal spectral channel design method for the photonic integrated interferometric imaging system according to claim 1, characterized in that: In step S2, the product of the number of spectral channels of the photonic integrated interferometric imaging system and the initial spectral sampling interval is equal to the bandwidth value of the photonic integrated interferometer chip of the photonic integrated interferometric imaging system.
5. The optimal spectral channel design method for the photonic integrated interferometric imaging system according to claim 4, characterized in that: In step S3, the difference between adjacent spectral sampling intervals is greater than or equal to 5 nm, and the larger the bandwidth value of the photonic integrated interference chip, the larger the difference between adjacent spectral sampling intervals.