<title>Analysis of defocusing thermal effects in optical systems</title>

Space focusing mirror assembly with flexure hinges

“…The natural frequency, the effects of gravity and temperature on focusing mirror assembly are carried out respectively using finite element analysis software, ANSYS [8,9].…”

Analytical model for effect of temperature variation on PSF consistency in wavefront coding infrared imaging system

“…For designing an infrared optical system, the hypothesis for a linear thermal deformation of infrared materials is widely reported [17][18][19], and is in-line by some commercial optical design codes such as ZEMAX [20]. Based on the same hypothesis, this paper pays attention to the derivation of a formula for thermal deformation of an optical phase mask.…”

“…The previous research proves the thermal defocus take the initiative compared with the aberration [18]. For the designed optical system in Fig.…”

“…The thermal deformation of a spherical lens is widely reported [17]. Thermal deformations for its central thickness, radius, and refraction can be separately listed as [17,18],…”

Calculating model for equivalent thermal defocus amount in infrared imaging system

“…Thomas H. Jamieson considered that the variation in temperature caused the focus of single lens shifting and proposed an opto-thermal expansion coefficient [7]. Olivieri described a general method for the analysis of the thermal effect in optical systems and considered that the thermal effect on infrared imaging systems is mainly focus shift [8]. Kucherenko analyzed the variation of optical aberrations with temperature and showed that aberrations hardly change with temperature [9].…”