Design of Infrared Dual-Band Confocal Composite Aperture Optical System

Fig. 6. Wave aberration maps of central sub-aperture optical system imaging in different bands. (a) Long wave infrared band; (b) mid-wave infrared band

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Fig. 7. Structural diagram of edge sub-aperture optical system

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Fig. 8. MTF curves of edge sub-aperture optical system. (a) Long wave infrared band; (b) mid-wave infrared band

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Fig. 9. Wave aberration maps of edge sub-aperture optical system imaging at different bands. (a) Long wave infrared band; (b) mid-wave infrared band

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Fig. 10. Structural diagram of relay image transfer system

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Fig. 11. MTF curves of relay image transfer optical system. (a) Long wave infrared band; (b) mid-wave infrared band

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Fig. 12. Point sequence diagram of relay image transfer optical system. (a) Long wave infrared band; (b) mid-wave infrared band

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Fig. 13. Grid distortion diagram of relay image transfer optical system. (a) Long wave infrared band; (b) mid-wave infrared band

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Fig. 14. Imaging optical path diagram of composite aperture optical system

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Fig. 15. Energy enclosed diagram of receiving optical system. (a) Mid-wave infrared band; (b) long wave infrared band

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Fig. 16. MTF curves of central sub-aperture optical system at different wavelengths under high and low temperatures. (a) Long wave infrared band (-40 ℃); (b) long wave infrared band (60 ℃); (c) mid-wave infrared band (-40 ℃); (d) mid-wave infrared band (60 ℃)

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Fig. 17. MTF curves of edge sub-aperture optical system at different wavelengths under high and low temperatures. (a) Long wave infrared band (-40 ℃); (b) long wave infrared band (60 ℃); (c) mid-wave infrared band (-40 ℃); (d) mid-wave infrared band (60 ℃)

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Fig. 18. MTF curves of relay image transfer optical system at different wavelengths under high and low temperatures. (a) Long wave infrared band (-40 ℃); (b) long wave infrared band (60 ℃); (c) mid-wave infrared band (-40 ℃); (d) mid-wave infrared band (60 ℃)

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Fig. 19. Tolerance analysis of composite aperture system

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Table 1. Basic parameters of composite aperture optical system

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Table 1. Basic parameters of composite aperture optical system

Parameter	Value
Total field angle 2ω /（°）	24
Center sub-aperture field angle 2ω₀ /（°）	6
Edge sub-aperture field angle 2ω₁ /（°）	12
Radius of base R /mm	336
Number of sub apertures N	5
Angle between optical axes of adjacent sub apertures Δφ /（°）	6

Table 2. Overall design indexes of composite aperture optical system
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Table 2. Overall design indexes of composite aperture optical system
Parameter Value
Detection distance /km 20
Target size /m 6
Imaging band /μm 3.7-4.8，7.7-9.5
Detector resolution /（pixel $\times$ pixel） 320×256
Pixel size of detector /μm 30

Table 3. Performance indexes of central sub-aperture optical system
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Table 3. Performance indexes of central sub-aperture optical system
Parameter Value
Working wavelength /μm 3.7-4.8（mid-wave infrared），7.7-9.5（long wave infrared）
Focal length /mm 200
F number 4
Field of view /（°） 6

Table 4. Performance indexes of edge sub-aperture optical system
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Table 4. Performance indexes of edge sub-aperture optical system
Parameter Value
Working wavelength /μm 3.7-4.8（mid-wave infrared），7.7-9.5（long wave infrared）
Focal length /mm 50
F number 4
Field of view /（°） 12

Table 5. Comparison of image plane matching schemes

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Table 5. Comparison of image plane matching schemes

Scheme	Advantage	Disadvantage
Matching curved surface image sensor	Whole system has small volume and field of view exceeding 150°	Complex process and difficult manufacturing
Adding optical fiber bundle relay image conversion system	Field of view can reach 140°and matching difficulty is low	System volume is slightly larger and there are few imaging channels
Adding optical relay image conversion system	There are many sub-eyes with field of view exceeding 120°	System volume is slightly larger
Design for different layers and different focal lengths	Whole system is small in size	Field of view is less than 100° and number of sub-eyes is insufficient

Table 6. Performance indexes of relay image transfer system
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Table 6. Performance indexes of relay image transfer system
Parameter Value
Working wavelength /μm 3.7-4.8（mid-wave infrared），7.7-9.5（long wave infrared）
Focal length /mm 3.4
F number 4
Field of view /（°） $\geq$ 30

Table 7. Focal length values of different bands of central sub-aperture at different temperatures
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Table 7. Focal length values of different bands of central sub-aperture at different temperatures
Temperature /
℃
Focal length value at mid-wave infrared Focal length value at long wave infrared
-40 199.928 200.096
20 199.928 200.087
60 199.925 200.083

Table 8. Focal length values of different bands of edge sub-aperture at different temperatures
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Table 8. Focal length values of different bands of edge sub-aperture at different temperatures
Temperature /℃ Focal length value at mid-wave infrared Focal length value at long wave infrared
-40 49.9043 50.0000
20 49.9039 50.0000
60 49.9037 50.0001

Table 9. Focal length values of different bands of relay image transfer system at different temperatures
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Table 9. Focal length values of different bands of relay image transfer system at different temperatures
Temperature /℃ Focal length value at mid-wave infrared Focal length value at long wave infrared
-40 3.39992 3.40254
20 3.39750 3.40000
60 3.39586 3.39823

Table 10. Tolerance allocation of composite aperture optical system

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Table 10. Tolerance allocation of composite aperture optical system

Parameter	Value
Tolerance of radius of curvature，thickness，eccentricity /mm	±0.02
Tilt tolerance /（°）	±0.02
Surface irregularity	0.2
Material refractive index tolerance	±0.001
Abbe number tolerance	±0.5

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Gengming Dang, Ming Gao, Chen Fan, Yang Chen. Design of Infrared Dual-Band Confocal Composite Aperture Optical System[J]. Acta Optica Sinica, 2023, 43(8): 0822019

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Paper Information

Category: Optical Design and Fabrication

Received: Oct. 31, 2022

Accepted: Dec. 27, 2022

Published Online: Apr. 6, 2023

The Author Email: Gao Ming (minggao1964@163.com)

DOI:10.3788/AOS221905

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Basic parameters of composite aperture optical system

Table 1. Basic parameters of composite aperture optical system

Table 2. Overall design indexes of composite aperture optical system

Table 2. Overall design indexes of composite aperture optical system

Table 3. Performance indexes of central sub-aperture optical system

Table 3. Performance indexes of central sub-aperture optical system

Table 4. Performance indexes of edge sub-aperture optical system

Table 4. Performance indexes of edge sub-aperture optical system

Table 5. Comparison of image plane matching schemes

Table 5. Comparison of image plane matching schemes

Table 6. Performance indexes of relay image transfer system

Table 6. Performance indexes of relay image transfer system

Table 7. Focal length values of different bands of central sub-aperture at different temperatures

Table 7. Focal length values of different bands of central sub-aperture at different temperatures

Table 8. Focal length values of different bands of edge sub-aperture at different temperatures

Table 8. Focal length values of different bands of edge sub-aperture at different temperatures

Table 9. Focal length values of different bands of relay image transfer system at different temperatures

Table 9. Focal length values of different bands of relay image transfer system at different temperatures

Table 10. Tolerance allocation of composite aperture optical system

Table 10. Tolerance allocation of composite aperture optical system