CN-121009648-B - Optical element support structure optimization method, device and equipment

CN121009648BCN 121009648 BCN121009648 BCN 121009648BCN-121009648-B

Abstract

The invention relates to the field of laser communication and provides a method, a device and equipment for optimizing a supporting structure of an optical element, wherein the method comprises the steps of determining an initial geometric model of the supporting structure according to space configuration parameters of the optical element; the method comprises the steps of determining an equivalent stiffness model of a supporting structure and an optical element based on an initial geometric model, performing thermal coupling finite element simulation on the initial geometric model, simulating stress distribution and deformation data under wide temperature range gradient load, further determining node displacement data of the surface of the optical element, converting the node displacement data into an optical axis deflection vector in an optical coordinate system, minimizing a model value of the optical axis deflection vector to be a target, controlling a thermal deformation ratio in the equivalent stiffness model to approach a preset value, and performing topology optimization iteration on the geometric model of the supporting structure until the supporting structure meeting the requirement of optical axis stability is obtained. The invention solves the problem of optical axis deviation caused by thermal deformation mismatch of the optical element supporting structure in the wide temperature range environment in the prior art.

Inventors

SUN ZITING
LI KANG
XIE TENG

Assignees

北京极光星通科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250805

Claims (10)

1. A method of optimizing a support structure for an optical element, comprising: determining an initial geometric model of the support structure according to the spatial configuration parameters of the optical element; determining an equivalent stiffness model of the support structure and the optical element based on the initial geometric model; Performing thermodynamic coupling finite element simulation on the initial geometric model, and simulating stress distribution and deformation data under wide temperature range gradient load; determining node displacement data of the surface of the optical element according to the stress distribution and deformation data; converting the node displacement data into an optical axis deflection vector in an optical coordinate system; The method comprises the steps of taking the model value of the optical axis deflection vector as a target, controlling the thermal deformation ratio in the equivalent stiffness model to approach to a preset value, and performing topology optimization iteration on the geometric model of the support structure until the support structure meeting the optical axis stability requirement is obtained; The temperature interval of the wide temperature range is from a first degree centigrade to a second degree centigrade, the thermal deformation ratio is the thermal deformation ratio of the optical element and the supporting structure when the temperature changes, and the thermal deformation ratio is the product of the thermal expansion coefficient alpha_s of the supporting structure and the rigidity K_s divided by the product of corresponding parameters of the optical element.
2. The method for optimizing a support structure of an optical element according to claim 1, wherein the determining an initial geometric model of the support structure according to the spatial configuration parameters of the optical element specifically comprises: acquiring space configuration parameters of the optical element, wherein the space configuration parameters comprise optical path layout, shape and position parameters and an optical coordinate system; determining an installation reference plane of the optical element according to the optical path layout; Determining a positioning element between the support structure and the optical element according to the shape and position parameters; And establishing an initial geometric model of the support structure according to the installation datum plane, the positioning element and the optical coordinate system, wherein the datum coordinate system of the initial geometric model coincides with the optical coordinate system or has a known transformation relation.
3. The method for optimizing a support structure of an optical element according to claim 1, wherein the determining an equivalent stiffness model of the support structure and the optical element based on the initial geometric model specifically comprises: Acquiring material properties and section geometric parameters of a support structure in the initial geometric model; determining a first equivalent stiffness of an optimized region of the support structure mounting foot according to the material properties and the cross-sectional geometry parameters; Acquiring material properties and an effective bearing section of the optical element, and determining second equivalent rigidity of the optical element according to the material properties and the effective bearing section; An equivalent stiffness model is determined from the first equivalent stiffness, the second equivalent stiffness, the first coefficient of thermal expansion of the support structure, and the second coefficient of thermal expansion of the optical element.
4. The method for optimizing a supporting structure of an optical element according to claim 1, wherein the performing thermal coupling finite element simulation on the initial geometric model simulates stress distribution and deformation data under a wide temperature gradient load, specifically comprises: Dividing the initial geometric model into finite element grids; for each unitary grid, loading temperature loads in sections by taking a preset temperature value as each load step in a temperature interval from the first degree centigrade to the second degree centigrade; And calculating stress distribution and node displacement of the supporting structure under each load step, and stress distribution and node displacement of the optical element, and taking the node displacement of the supporting structure and the node displacement of the surface of the optical element as deformation data.
5. The method for optimizing a supporting structure of an optical element according to claim 1, wherein determining node displacement data of a surface of the optical element according to the stress distribution and deformation data specifically comprises: determining displacement vectors of all nodes on the surface of the optical element according to the stress distribution and deformation data; decomposing the displacement vector of each node into translation components along each coordinate variable direction in the optical coordinate system; and (3) carrying out node numbering and coordinate mapping on the decomposed translation components to generate node displacement data of the surface of the optical element.
6. The method of optimizing a support structure for an optical element according to claim 1, wherein said converting the node displacement data into an optical axis deflection vector in an optical coordinate system, in particular, comprises: selecting a plurality of nodes which are not in the same straight line on the surface of the optical element as reference nodes; calculating a displacement vector of each reference node in the optical coordinate system according to the node displacement data; Assembling the displacement vector into a rigid transformation matrix through homogeneous coordinate transformation, and extracting a rotating submatrix of the rigid transformation matrix; calculating the rotation angle of the optical element around a coordinate axis in an optical coordinate system according to the rotation submatrix; the rotation angles are combined into an optical axis deflection vector.
7. A support structure optimizing apparatus for an optical element, comprising: the initial geometric model construction module is used for determining an initial geometric model of the support structure according to the space configuration parameters of the optical element; the equivalent stiffness model construction module is used for determining an equivalent stiffness model of the support structure and the optical element based on the initial geometric model; the finite element simulation module is used for carrying out thermodynamic coupling finite element simulation on the initial geometric model and simulating stress distribution and deformation data under wide temperature range gradient load; the node displacement calculation module is used for determining node displacement data of the surface of the optical element according to the stress distribution and deformation data; the vector conversion module is used for converting the node displacement data into an optical axis deflection vector in an optical coordinate system; The topological optimization iteration module is used for taking the module value of the optical axis deflection vector as a target, controlling the thermal deformation ratio in the equivalent stiffness model to approach to a preset value, and carrying out topological optimization iteration on the geometric model of the support structure until the support structure meeting the requirement of optical axis stability is obtained; The temperature interval of the wide temperature range is from a first degree centigrade to a second degree centigrade, the thermal deformation ratio is the thermal deformation ratio of the optical element and the supporting structure when the temperature changes, and the thermal deformation ratio is the product of the thermal expansion coefficient alpha_s of the supporting structure and the rigidity K_s divided by the product of corresponding parameters of the optical element.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements a method for optimizing the support structure of an optical element according to any one of claims 1 to 6 when executing the computer program.
9. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements a method of optimizing the support structure of an optical element according to any one of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements a method for optimizing the support structure of an optical element according to any one of claims 1 to 6.

Description

Optical element support structure optimization method, device and equipment Technical Field The present invention relates to the field of laser communications, and in particular, to a method, an apparatus, and a device for optimizing a supporting structure of an optical element. Background The laser communication technology has important application value in the fields of space exploration, satellite communication, ground long-distance transmission and the like. However, in an extreme temperature environment, such as space, desert, etc., the optical element of the laser communication device and its supporting structure may generate thermal deformation mismatch due to temperature change, resulting in optical axis shift, and seriously affecting communication quality. Particularly under the condition of wide temperature range, the traditional support structure design method is difficult to meet the requirement of high-precision optical axis stability, and a new optimization method is needed to solve the technical problem. Currently, two technical routes, passive thermal compensation and active temperature control, are mainly adopted in the industry for optimizing the thermal stability of the optical element supporting structure. Passive thermal compensation reduces thermal distortion by using low coefficient of thermal expansion materials, but such materials are costly and difficult to completely match the nonlinear thermal distortion characteristics of the optical element. The active temperature control depends on a heater or a refrigerator to dynamically adjust the temperature, and although the thermal deformation problem can be partially alleviated, the power consumption, the weight and the complexity of the system can be increased, and the active temperature control is not suitable for the lightweight and low-power laser communication terminal. In addition, in the prior art, simulation optimization is performed based on a single temperature point or an empirical formula, so that nonlinear thermal deformation behavior in a wide temperature range cannot be accurately predicted, and the stability of an optical axis in practical application is insufficient. Disclosure of Invention The invention provides a method, a device and equipment for optimizing a supporting structure of an optical element, which solve the problem of optical axis deviation caused by thermal deformation mismatch of the supporting structure of the optical element in a wide temperature range environment in the prior art, and ensure the stability of the optical axis under the condition of no need of active temperature control or high-cost passive materials. The invention provides a method for optimizing a supporting structure of an optical element, which comprises the following steps: determining an initial geometric model of the support structure according to the spatial configuration parameters of the optical element; determining an equivalent stiffness model of the support structure and the optical element based on the initial geometric model; Performing thermodynamic coupling finite element simulation on the initial geometric model, and simulating stress distribution and deformation data under wide temperature range gradient load; determining node displacement data of the surface of the optical element according to the stress distribution and deformation data; converting the node displacement data into an optical axis deflection vector in an optical coordinate system; The method comprises the steps of taking the model value of the optical axis deflection vector as a target, controlling the thermal deformation ratio in the equivalent stiffness model to approach to a preset value, and performing topology optimization iteration on the geometric model of the support structure until the support structure meeting the optical axis stability requirement is obtained; the temperature range of the wide temperature range is from a first degree celsius to a second degree celsius, and the thermal deformation ratio is a thermal deformation ratio of the optical element and the supporting structure when the temperature is changed. The method for optimizing the supporting structure of the optical element comprises the steps of obtaining the space configuration parameters of the optical element, determining the installation reference plane of the optical element according to the light path layout, determining the positioning element between the supporting structure and the optical element according to the shape and position parameters, establishing the initial geometric model of the supporting structure according to the installation reference plane, the positioning element and the optical coordinate system, and enabling the reference coordinate system of the initial geometric model to coincide with the optical coordinate system or have a known transformation relation. The method for optimizing the supporting structure of the optical element comprises the st