Aspheric Far-Infrared Lenses Based on Hot-Moldable Chalcogenide Glass

Yong Jian Zhu; Wei Qing Pan; Jian Feng Sun

doi:10.4028/www.scientific.net/KEM.538.293

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 538Aspheric Far-Infrared Lenses Based on Hot-Moldable...

Aspheric Far-Infrared Lenses Based on Hot-Moldable Chalcogenide Glass

Abstract:

The far infrared lenses are widely used in vehicle and night vision instrument. A new far infrared lens is proposed to enhance their performance of danger recognition at night. It focuses on the infrared light of wavelength from 8µm ~12µm. The lens is based on the uncooled infrared detector with 320x240 pixels. Its main structure is made of one refractive-diffractive aspheric lens and two spherical lenses. To improve the luminous flux, the f-number is set to be less than 1. The field of view (FOV) of 23 degrees is wide enough to help monitor the dangerous signal around the car or community. In addition, in order to reduce the cost and improve the machinability of aspheric diffractive lens, the hot-moldable chalcogenide glass is chosen to be the material of lenses. As a result, the MTF (modulation transfer function) values of lens exceed 0.5 for all field angles at Nyquist frequency. It shows that the lens enjoys high imaging quality.

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Periodical:

Key Engineering Materials (Volume 538)

Pages:

293-296

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.538.293

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Online since:

January 2013

Authors:

Yong Jian Zhu, Wei Qing Pan, Jian Feng Sun

Keywords:

Chalcogenide Glass, Far Infrared Lens, Lens Molding, Optical Design

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