REFRACTIVE IR OBJECTIVE OPTICAL DESIGN OPERATING IN LWIR BAND FOR MILITARY OBSERVATION APPLICATIONS
AHMED N.ELHEFNAWY
Cadet , Military Technical College
Cairo, Egypt
ghost_g75 @ yahoo.com
Abstract: IR objective is a very essential component of infrared imaging system that plays an important role in the performance of overall system. In this paper, a design of objective operating in (8-12µm) spectral band is done using ZEMAX software. The refractive design is chosen since reflective one provides smaller FOV. In order to get high resolution we picked up a detector with pixel pitch of 25 µm with a high MTFA value of .6 at spatial frequency resolution boundary (Nyquist frequency) of20 cycle/millimeter, in order to cover wide FOV this detector pixel pitch and small focal length value provides so. This high resolution and wide FOV make this design suitable for the observation applications. Keywords: Infrared imaging system , Objective design , Thermal IR Materials ,Long wavelength infrared (LWIR) , Average modulation transfer function (MTFA) , Nyquist frequency, RMS spot radius.
1-INTRODUCTION
The use of infrared cameras is common in all fields of industry. Applications such as non-destructive testing,monitoring and security in public places such as airports has made infrared cameras one of the most popular instruments in these fields [1].
Thermal imagers are imaging systems that generate images of the observed scenery using thermal radiation emitted by the scenery In .TIS from images of the observed field of view (FOV) by detecting scene radiated thermal energy from objects overcomes their reflected energy since the reflected energy is low to be detected over this wavelength portion.
Objects of typical earth temperatures emit radiation mostly in the spectral region from about 3 µm to about 15 µm. Thermal radiation emitted by these objects dominate over the radiation reflected by them at this spectral range because the radiation emitted by sun, moon, stars and typical artificial sources is weak for wavelengths over 3 µm. There are two „atmospheric windows” in the above mentioned range: the 3-5-µm window and the 8-12-µm window. Therefore there are two main types of thermal imaging systems: the middle-wave MW systems using the 3-5-µm win-dow and the long-wave LW systems using the 8-12-µm window and rarely available commercially SW systems of spectral band located within 1-3-µm range.
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