一种便携式外场用MRTD测试仪的研制

吴李鹏; 郭羽; 王学新; 刘瑞星; 杜萌; 王浩

一种便携式外场用MRTD测试仪的研制

西安应用光学研究所, 国防科技工业光学一级计量站, 陕西西安 710065

基金项目: 国防科工局技术基础项目

详细信息

作者简介:
吴李鹏（1976-），男，硕士，高级工程师，主要从事光机结构设计工作。E-mail：290134715@qq.com

中图分类号: TN216
计量
- 文章访问数: 223
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- PDF下载量: 54
- 被引次数: 0
出版历程
- 收稿日期: 2021-05-28
- 修回日期: 2021-06-24
- 刊出日期: 2022-03-20

Development of a Portable Field MRTD Tester

Primary Optical Metrology Station of Science Technology and Industry for National Defence, Xi'an Institute of Applied Optics, Xi'an 710065, China

摘要

摘要: 目前热像仪MRTD测试主要在室内，为了满足外场热像仪MRTD测试的需求，研制了一种便携式MRTD测试仪。文章主要阐述了仪器的研制原理、光学优化设计、结构设计及黑体组件等的设计要点。目前，该仪器已经用于外场环境的热像仪MRTD测试，结果准确。
- 红外测试 /
- MRTD测试仪 /
- 便携式
Abstract: Currently, the minimum resolvable temperature difference (MRTD) test of a thermal imager is mainly undertaken indoors. To meet the testing requirements of MRTD in other environments, a portable MRTD tester is proposed. This paper describes the development principle of the instrument, optical optimization design, mechanical design, and environment adaptability design, as well as the design points of the blackbody and other components. At present, this instrument has been used in the MRTD test of thermal imagers in outdoor environments and shows accurate results.
- IR test /
- MRTD tester /
- portable

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图 1 MRTD测试仪原理图

Figure 1. Schematic diagram of MRTD tester

1 Off axis parabolic mirror; 2 Infrared window; 3 Secondary mirror; 4 Four bar target; 5 Electric switching target wheel; 6 Blackbody; 7 Thermal imager to be tested

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图 2 光学系统不同视场点列图

Figure 2. Spot diagram of different fields of view in optical system

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图 3 光学系统调制传递函数曲线

Figure 3. MTF curve of optical system transfer function

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图 4 主壳体铸造三维图

Figure 4. Three dimensional drawing of main shell casting

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图 5 主壳体内部消杂光光阑示意图

Figure 5. Schematic diagram of stay light diaphragm in main shell

1 Off axis parabolic mirros: 2 Stray aperture; 3 Focal plane; 4 Mirror

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图 6 黑体原理图

Figure 6. Blackbody schematic diagram

1 Pt100;2 Teflon shell; 3 Radiating body; 4 TEC; 5 Radiator; 6 AC fan

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图 7 四杆靶尺寸图

Figure 7. Diagram of four bar target

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图 8 离轴反射系统装调示意图

Figure 8. Installation and adjustment diagram of off-axis reflection system

1 Pentaprism; 2 Theodolite; 3 Mirror; 4 Cross target; 5 Lamp; 6 Off axis parabolic mirror

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表 1 离轴抛物镜（主镜）和反射镜（次镜）镀不同膜层的系统反射率

Table 1. Reflectivity of off axis parabolic mirror and secondary mirror coated with different materials

Coating	0.4-0.76 μm	1-2.5 μm	3-5 μm	8-15 μm
Both mirrors-protected aluminum	0.77	0.86	0.92	0.93
Primary mirror-protected aluminum； secondary mirror--protected silver	0.84	0.9	0.93	0.93
Both mirrors-protected silver	0.93	0.93	0.93	0.93
Primary mirror--protected aluminum； secondary mirror--protected gold	0.53	0.92	0.95	0.95
Both mirrors-protected gold	0.36	0.96	0.96	0.96

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表 2 黑体参数

Table 2. Blackbody parameters

Operating temperature range	20~50℃
Effective area	40 mm×40 mm
Resolution	0.01℃
Stability	±0.05℃/3 min
Uniformity	±0.1℃
Emissivity	≥0.97

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参考文献(15)

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