Design of Wide Field-of-View and Multi-Targets 3D Imaging Optical System with Coaxial Five Mirrors

Fig. 4. Reflective corrector of common aperture main optical system. (a) Magnification of the secondary mirror is positive; (b) magnification of the secondary mirror is negative

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Fig. 5. Designed optical path of common aperture main optical system

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Fig. 6. Optical path difference of common aperture main optical system

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Fig. 7. Optical path diagram of the system

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Fig. 8. Designed optical path of MWIR imaging sensor

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Fig. 9. MTF of MWIR imaging sensor

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Fig. 10. Enclosed energy curve of MWIR imaging sensor

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Fig. 11. Designed optical path of laser ranging unit

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Fig. 12. Wavefront error of laser ranging unit

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Table 1. Mean technical parameters of electro-optical system
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Table 1. Mean technical parameters of electro-optical system
Parameter Value
Range 1-20 km
Field-of-regard ≥20°
Target number ≥6
Camera bandpass 3-5 μm
Laser bandpass 1.55 μm
System resolution ≤15 mrad
Update rate ≥30 Hz

Table 2. Relationship between the technical parameters of the system and optics parameters

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Table 2. Relationship between the technical parameters of the system and optics parameters

Technical parameter	Optics parameter
Technical parameter	Primary aperture	Instantaneousprimary aperture	Primary Fnumber	Secondaryaperture	Secondary magnification
Field-of-regard	Ratio	—	—	—	—
Instantaneous field-of-regard	—	Inverse ratio	Ratio	Ratio	Inverse ratio
System obstruction	—	—	—	Ratio	Ratio
Update rate	—	Inverse ratio	Inverse ratio	Inverse ratio	Ratio
System aberration	—	Ratio	Inverse ratio	Inverse ratio	Ratio
System resolution	—	Ratio	—	—	—

Table 3. Designed parameters of common aperture main optical system

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Table 3. Designed parameters of common aperture main optical system

Parameter	Value
Primary aperture	1000 mm
Primary F number	0.59
Instantaneous primary aperture	600.00 mm
Secondary aperture	108.16 mm
Secondary magnification	-40.4
Field-of-regard	20.7°
Instantaneous field-of-regard	0.26°
System obstruction	0.18

Table 4. Configuration parameters of common aperture main optical system

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Table 4. Configuration parameters of common aperture main optical system

Item	Radius /mm	Thickness /mm	Aperture /mm	Aspheric order
Primary	-1180.00	-469.99	600.00	—
Secondary	-246.11	-1043.49	108.16	4^th oder term:-2.776×10^-86^th oder term:-2.989×10^-128^th oder term:3.117×10^-1610^th oder term:-1.189×10^-19
Tertiary	237.24	100.80	144.49	—
Quaternary	105.08	—	39.24	4^th oder term:-2.076×10^-76^th oder term:-6.726×10^-108^th oder term:5.407×10^-1410^th oder term:-2.173×10^-15

Table 5. Optical design parameters of MWIR imaging sensor
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Table 5. Optical design parameters of MWIR imaging sensor
Parameter Value
System F number 4
Focal length 2400 mm
Field-of-regard 0.26°
Detector type InSb
Bandpass 3-5 μm
Active pixel 320´256
Pixel size 30 mm
Instantaneous field of view 12.5mrad/pixel

Table 6. Optical design parameters of laser ranging unit
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Table 6. Optical design parameters of laser ranging unit
Parameter Value
Laser type Optical parametric oscillator shifted Nd∶YAG
Wavelength 1.55 μm
Beam divergence 20 mrad
Output pulse energy ≥50 mJ
Beam magnification 20×
Range 1-20 km
Detector type InGaAs APD

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Yingqi Liu, Yuan Luo, Hua Lu, Fulin Mei, Ying’en Shu. Design of Wide Field-of-View and Multi-Targets 3D Imaging Optical System with Coaxial Five Mirrors[J]. Acta Optica Sinica, 2018, 38(6): 0608001

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