Optical setup for evaluating image quality of thermal imaging lenses working in the spectral region of 8÷12 µm
147 viewsDOI:
https://doi.org/10.54939/1859-1043.j.mst.82.2022.134-141Abstract
In this paper, we demonstrate a homemade setup and an image processing algorithm to evaluate the image quality of optical systems working in the spectral region of 8-12 µm. The working principle of our approach relies on measuring the line spread function (LSF) and the modulation transfer function (MTF). All components in the setup are carefully designed and manufactured, and we strictly follow quality control to limit measurement errors. The setup can determine the LSF and MTF of a thermal imaging lens with a focal length of f' ≤ 500 mm and pupil diameter D ≤ 100 mm. A number of objective samples have been studied using our setup, and the experimental results indicate that our setup can work reliably with high accuracy.
References
[1]. Michael Bass, “ Handbook of optics”, 2nd ed, Vol. 2, McGraw-Hill, (1995).
[2]. Bijl, A. Toet, Valeton, “Electro-Optical Imaging System Performance Measurement”, (2003).
[3]. Optikos Coporation, “How to measure MTF and other properties of lense”, (1999).
[4]. K. Chrzanowski, “Evaluation of infrared collimators for testing thermal imaging systems”, Opto-electron, Rev. 15, No. 2, (2007). DOI: https://doi.org/10.2478/s11772-007-0005-9
[5]. V.A. Panov, “Microscopy optics”, (1976).
[6]. Le Duy Tuan, Tran Anh Quang, Le Hoang Hai, “Design and manufacture of an ir-collimator used to test thermal imaging lenses working in the spectral region of 8÷12 µm”, The 11th International Conference on Photonics & Applications, (2021). DOI: https://doi.org/10.54939/1859-1043.j.mst.82.2022.134-141
[7]. Tran Anh Quang, Le Duy Tuan, Le Hoang Hai, Le Van Nhu, “Design and manufacture of a microscpoe objective used to test optical systems working in the spectral region of 8÷12 µm”, The 6th Academic Conferfence On Natural Science For Young Scientists, Master & PhD Students From Asean Countries, (2021).
[8]. R. C. Gonzalez, R. E. Woods, “Digital Image Processing”, 4th edition, (2018).
[9]. David R. Bull, Fan Zhang, “Intelligent Image and Video Compression”, 2nd Edition, (2021).
[10]. S.A. Rodionov, “Basic Optics”, ITMO 2000.
