Correcting the effect of temperature on image quality of thermal imaging objectives by wavefront coding technique
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https://doi.org/10.54939/1859-1043.j.mst.83.2022.48-58Keywords:
Thermal objective; Defocus; Restored algorithm.Abstract
The paper has proposed a method for correcting the effect of temperature on the imaging quality of thermal imaging systems by wavefront coding technology. A cubic phase mask was added to the aperture diaphragm of the thermal imaging objective to obtain a temperature-invariant point spread function (PSF). The received images will be of low quality but almost invariant with the change in temperature. An inverse filter was used to recover high-quality images over a variable temperature range. To demonstrate the effectiveness of the proposed method, a thermal imaging objective was used to experiment. The simulation results demonstrate that the proposed method can effectively eliminate the temperature influence on the image quality of the thermal imaging objective.
References
[1]. T.H. Jamieson, “Thermal effects in optical systems,” Opt. Eng, 20, pp.156, (1981). DOI: https://doi.org/10.1117/12.7972683
[2]. D.S. Grey, “Athermalization of optical systems,” J. Opt. Soc. Am, 38, pp. 542, (1948). DOI: https://doi.org/10.1364/JOSA.38.000542
[3]. B. Feng, Z. Shi, Y. Zhao, H. Liu, L. Liu, “A wide-FoV athermalized infrared imaging system with a two-element lens,” Infrared Physics & Technology, 87, pp. 11, (2017). DOI: https://doi.org/10.1016/j.infrared.2017.09.021
[4]. Q. J. Gao, J. Wang, Q. Sun, “Design of a compact athermalized infrared seeker,” Optoelectronics Letters, 13, pp. 287, (2017). DOI: https://doi.org/10.1007/s11801-017-7053-2
[5]. E. R. Dowski, and W. T. Cathey, “Extended depth of field through wave-front coding,” Appl. Opt, 34, pp. 1859–1866, (1995). DOI: https://doi.org/10.1364/AO.34.001859
[6]. M. Demennikov, and A. R. Harvey, “Image artifacts in hybrid imaging systems with a cubic phase mask”, Opt. Express, 18, pp. 8207, (2010).
[7]. M. Demenikov, and A. R. Harvey, “Parametric blind-deconvolution algorithm to remove image artifacts in hybrid imaging systems,” Opt. Express, 18, pp. 18035, (2010). DOI: https://doi.org/10.1364/OE.18.008207
[8]. J. Sheng, H. Cai, Y. Wang, X. Chen and Y. Xu, “Improved Exponential Phase Mask for Generating Defocus Invariance of Wavefront Coding Systems,” Appl. Sci, 12, pp. 5290, (2022). DOI: https://doi.org/10.3390/app12115290
[9]. V. Le, Z. Fan, S. Chen, D. D. Quoc, “Optimization of wavefront coding imaging system based on the phase transfer function,” Optik, 127, pp. 1148, (2016). DOI: https://doi.org/10.1016/j.ijleo.2015.10.111
