Development of a fast aperture, high resolution, wide-angle, optically passive athermalized LWIR lens for driver vision enhancer systems

Vu Thanh Dat; Xuan Du Dang; Van Dat Nguyen

doi:10.1117/12.2688439

28 November 2023 Development of a fast aperture, high resolution, wide-angle, optically passive athermalized LWIR lens for driver vision enhancer systems

Vu Thanh Dat, Xuan Du Dang, Van Dat Nguyen

Author Affiliations +

Proceedings Volume 12765, Optical Design and Testing XIII; 127650G (2023) https://doi.org/10.1117/12.2688439
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

This paper presents the design of a fast aperture, high resolution, wide-angle, optically passive athermalized long-wave infrared (LWIR) lens suitable for driver vision enhancer systems. The growing demand in high resolution thermal imaging has led to the need for advanced lens designs that can deliver exceptional performance in this electromagnetic spectrum. The proposed lens design focuses on achieving a fast aperture, which is crucial for capturing object details in modern bolometer arrays with smaller pixel pitch. Additionally, the design provides a wide-angle field of view to enable comprehensive scene coverage. The use of optical passive athermalization technique also ensures that the lens maintain its performance across a wide range of operating temperatures, thereby eliminating the need for any active temperature compensation mechanisms. In order to achieve a large image diameter, the lens design incorporates aspheric and diffractive surfaces, as well as a combination between conventional and chalcogenide materials. These elements help to minimize optical aberrations and increase image sharpness. With the use of computer-aided design software and its corresponding optical simulation tools, the design was refined to meet the desired specifications, including resolution, field of view and athermalization requirements. The resulting lens design managed to achieve a horizontal field of view of 76 degrees with a fast aperture of F1.0 for an uncooled 12-micron SXGA detector. This design ensures consistent and nearly diffraction-limited performance in diverse operating conditions, making it suitable for driver vision enhancer systems, as well as the general automotive applications.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Vu Thanh Dat, Xuan Du Dang, and Van Dat Nguyen "Development of a fast aperture, high resolution, wide-angle, optically passive athermalized LWIR lens for driver vision enhancer systems", Proc. SPIE 12765, Optical Design and Testing XIII, 127650G (28 November 2023); https://doi.org/10.1117/12.2688439

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KEYWORDS

Athermalization

Design and modelling

Image resolution

Long wavelength infrared

Lens design

Thermography

Optical design software

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