[논문]Design and Performance Verification of a LWIR Zoom Camera for Drones

Kwang-Woo Park; Jonghwa Choi; Jian Kang

doi:10.3807/copp.2023.7.4.354

Design and Performance Verification of a LWIR Zoom Camera for Drones 원문보기

Current optics and photonics, v.7 no.4, 2023년, pp.354 - 361

Kwang-Woo Park (Agency for Defense Development) , Jonghwa Choi (Agency for Defense Development) , Jian Kang (Agency for Defense Development)

Abstract ▼ AI-Helper

We present the optical design and experimental verification of resolving performance of a 3× long wavelength infrared (LWIR) zoom camera for drones. The effective focal length of the system varies from 24.5 mm at the wide angle position to 75.1 mm at the telephoto position. The design specifications of the system were derived from ground resolved distance (GRD) to recognize 3 m × 6 m target at a distance of 1 km, at the telephoto position. To satisfy the system requirement, the aperture (f-number) of the system is taken as F/1.6 and the final modulation transfer function (MTF) should be higher than 0.1 (10%). The measured MTF in the laboratory was 0.127 (12.7%), exceeds the system requirement. Outdoor targets were used to verify the comprehensive performance of the system. The system resolved 4-bar targets corresponding to the spatial resolution at the distance of 1 km, 1.4 km and 2 km.

주제어

표/그림 (13)

그림 FIG. 1. Ground resolved distance according to optical system F/#.
그림 FIG. 2. MTF prediction results of the infared (IR) camera system.
그림 FIG. 3. System signal-to-noise ratio analysis (F/1.6).
표 TABLE 1. System signal-to-noise ratio (SNR) and ground resolved distance (GRD) analysis conditions of the infared (IR) camera
그림 FIG. 4. Optical design results of the 3×long wavelength infrared zoom system.
표 TABLE 2. Design specification of the 3×LWIR zoom system
그림 FIG. 5. Modulation transfer function (M TF) of the final 3×long wavelength infrared (LWIR) zoom system, at telephoto, middle and wide angle positions.
그림 FIG. 6. Experimental set-up for modulation transfer function and ground resolved distance resolution.
그림 FIG. 7. Results of the modulation transfer function (MTF). (a) Half-moon target image (MTF search range: 10 pixels), (b) MTF graph (12.7% at 41.6 cy/mm).
그림 FIG. 8. Equivalent relation between flight and laboratory imaging resolution test.
표 TABLE 3. Equivalent condition of flight laboratory environment
그림 FIG. 9. Results of the target’s ground resolved distance resolution. (a) ΔT : 2.79 K, (b) ΔT : 2.00 K, (c) ΔT : 1.38 K.
그림 FIG. 10. Outdoor images taken 1 km. (a) The image at the telephoto position, (b) the image at the wide angle position.

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