大型光学系统波前检测中气流扰动的抑制

徐抒岩; 张旭升; 范阔; 鞠国浩

doi:10.3788/OPE.20202801.0080

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大型光学系统波前检测中气流扰动的抑制

现代应用光学 | 更新时间：2020-08-13

- 大型光学系统波前检测中气流扰动的抑制
- Suppression of airflow turbulence in wavefront measurement for large-aperture optical systems
- 光学精密工程 2020年28卷第1期页码：80-89
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所，吉林长春 130033
- 作者简介：
  
  [ "徐抒岩(1963-)，男，吉林长春人，硕士，研究员，博士生导师，参加省部级课题及国防科研重点工程项目多项，发表学术论文100余篇，荣获中国载人航天工程突出贡献者奖章，曾宪梓载人航天基金突出贡献奖，主要研究方向为空间大口径光学望远镜、光学系统空间在轨组装等。Email：xusy@ciomp.ac.cn" ]
  [ "张旭升(1988-)，男，黑龙江讷河人，硕士，助理研究员，2013年于哈尔滨工业大学获得工程热物理专业硕士学位，主要从事红外热辐射传输、航天器精密热控技术等方面的研究。E-mail: zxs1933@126.com" ]
- 基金信息：
  
  国家重点研发计划资助项目(2016YFE0205000);自然科学基金资助项目(61905241)
- DOI：10.3788/OPE.20202801.0080
  中图分类号： O439; V11; P111.21
- 收稿日期：2019-06-06，
  
  录用日期：2019-8-6，
  
  纸质出版日期：2020-01-15
- 稿件说明：
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徐抒岩, 张旭升, 范阔, 等. 大型光学系统波前检测中气流扰动的抑制[J]. 光学精密工程, 2020,28(1):80-89.

Shu-yan XU, Xu-sheng ZHANG, Kuo FAN, et al. Suppression of airflow turbulence in wavefront measurement for large-aperture optical systems[J]. Optics and precision engineering, 2020, 28(1): 80-89.
徐抒岩, 张旭升, 范阔, 等. 大型光学系统波前检测中气流扰动的抑制[J]. 光学精密工程, 2020,28(1):80-89. DOI： 10.3788/OPE.20202801.0080.

Shu-yan XU, Xu-sheng ZHANG, Kuo FAN, et al. Suppression of airflow turbulence in wavefront measurement for large-aperture optical systems[J]. Optics and precision engineering, 2020, 28(1): 80-89. DOI： 10.3788/OPE.20202801.0080.

摘要

气流扰动将引起干涉检测光路中空气折射率动态变化，从而引入未知波前测量误差，它对于大口径、长焦距光学系统波前检测精度的影响尤为严重。为抑制该影响，本文提出一种基于计算流体动力学的主动温度场控制方法。首先，分析了气流扰动引入波前检测误差的原因，并基于流体力学理论阐明了通过主动送风手段提高室内温度场均匀性、抑制气流扰动影响的可行性。其次，结合口径为500 mm、焦距为6 000 mm的离轴三反望远镜检测光路构成以及所处环境条件，通过Fluent软件仿真建模提出一种利用风扇阵列主动送风的室内温度场控制方法。最后，对温度场控制前后实际光学检测数据进行对比，结果表明，控制前后7组像差系数测量值(一段时间内多次测量平均值)之间的标准差由0.034

减小到0.005

(

=632.8 nm)。本方法可有效抑制气流扰动对于光学检测精度的影响，对于提高非真空条件下大口径光学系统的波前检测精度具有一定的参考与借鉴意义。

Abstract

Airflow disturbance can cause a change in the air refractive index

which will introduce an unknown wavefront measurement error

especially for large-aperture

long-focus optical systems. To suppress this effect

this paper proposes an indoor temperature field control method based on Computational Fluid Dynamics (CFD). First

the cause of the wavefront detection error induced by air disturbance is analyzed

and the feasibility of improving the uniformity of indoor temperature field and restraining the influence of air disturbance using active air supply is expounded based on hydrodynamics theory. Secondly

an indoor temperature field control method using fan array for active air supply is proposed through simulation modeling

which considers the composition of the self-collimation optical path of an off-axis Three-Mirror Anastigmatic (TMA) telescope (diameter of 500 mm

focal length of 6 000 mm) and the environmental conditions. Finally

the actual optical measurement data before and after temperature field control are compared to verify the effectiveness of the proposed method. The results show that the standard deviation among the seven groups of aberration coefficient measurements (mean values of multiple measurements over a period of time) decreased from 0.034

to 0.005

(

=632.8 nm). The proposed method can effectively suppress the influence of airflow disturbance

which has certain reference significance for improving the optical detection accuracy of large-aperture long-focus optical systems under non-vacuum conditions.

关键词

Keywords

references

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