Integrated optomechanical analyses and experimental verification for a thermal system of an aerial camera

Zhi-peng Xue; Chun-xue Wang; Yue Yu; Peng-Peng Wang; Hong-Yu Zhang; Yuan-Yuan Sui; Ming Li; Ze-yong Luo

doi:10.1364/AO.58.006996

Applied Optics
Vol. 58,
Issue 26,
pp. 6996-7005
(2019)
•https://doi.org/10.1364/AO.58.006996

Integrated optomechanical analyses and experimental verification for a thermal system of an aerial camera

Zhi-peng Xue, Chun-xue Wang, Yue Yu, Peng-Peng Wang, Hong-Yu Zhang, Yuan-Yuan Sui, Ming Li, and Ze-yong Luo

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Zhi-peng Xue, Chun-xue Wang, Yue Yu, Peng-Peng Wang, Hong-Yu Zhang, Yuan-Yuan Sui, Ming Li, and Ze-yong Luo, "Integrated optomechanical analyses and experimental verification for a thermal system of an aerial camera," Appl. Opt. 58, 6996-7005 (2019)

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Abstract

The thermal control system based on a combination of passive and active methods for a compact aerial camera used in the unmanned aerial vehicle system is studied. Integrated analysis and an experimental method are developed to ensure both low-power limit and high image quality of the camera. For rapid estimation of thermal behavior, we develop a thermal mathematic model based on a thermal network method that also offers an initial design reference for the active control system; then we develop a more complex integrated analysis method to analyze and optimize the thermal system, which allows us to get performance insights such as internal temperature gradient and airflow of the compact system. We also focus on analyzing the optical surface errors under thermal disturbance. Comparisons of interferometer test records and thermal-elastic simulation results are presented, and this comparison shows that the integrated optomechanical analysis method contributes to the success of optomechanical system design by ensuring thermal disturbance will not deform the optical surfaces beyond allowable limits. Finally, the design method is verified through a thermo-optic experiment.

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Material	7075AL	Sandwich Composites
Structure parameter	3 mm/1.5 mm	(a) $\pm 45 °$ glass fiber (0.115 mm)
		(b) 0°, 90°glass fiber (0.115 mm)
		(c) foam (2 mm)
		(d) $\pm 45 °$ glass fiber (0.115 mm)
Mass	555 g	350 g
Natural frequency	1257 Hz	1420 Hz

Properties	Density kg/m3	Heat Transfer $W / (m \cdot k)$	Specific Heat J/(kg°C)
Polyimide pad	1430	0.35	1670–1750
SiQ2 blanket	130	0.018	502
Air	1.205	0.023	1005

Heat Transfer Road	Thermal Resistance	Heat Loss
Node $1 - Q_{out}$ ( $φ_{1}$ )	9.5	4.21
Node $2 - Q_{out}$ ( $φ_{2}$ )	15.5	2.58
Node $3 - Q_{out}$ ( $φ_{3}$ )	1.1	36.3

Lens Num	Temperature	Gradient
1	21.2–22.1	0.9
2	21.3–21.6	0.3
3	21.5–21.9	0.4
4	21.6–22.0	0.4
5	21.6–22.0	0.4
6	22.0–22.3	0.3
7	22.2–22.3	0.1
8	22.3–22.3	0.03
9	22.2–22.2	0.03
10	22.2–22.3	0.1
11	22.1–22.2	0.1
12	22.1–22.2	0.1
13	22.0–22.2	0.2
14	21.8–22.2	0.4
15	21.2–21.8	0.6

Optical Surface	Test Records		Thermo-Elastic
Optical Surface	PV	RMS	PV	RMS
Lens 2_upper	0.19	0.009	1.66	0.22
Lens 2_lower	0.11	0.012	1.01	0.13
Lens 7_upper	0.14	0.007	1.14	0.09
Lens 7_lower	0.25	0.006	1.29	0.17

Test Temperature	$T_{L - aver}$	$T_{L - axial}$	$T_{L - radial}$	$T_{W - aver}$	$T_{W - grad}$
0	20	0.8	0.2	20.5	0.1
−10	20.5	0.9	0.4	19	0.3
−20	20.4	1.2	0.5	18.5	0.5

Test Temperature	20°C	0°C	−10°C	−20°C
MTF	0.239	0.229	0.246	0.231
MTF error	—	4.18%	2.92%	3.34%
Heating power (W)	—	27.4	36.4	51.3

Test Temperature	Experiment	Integrated Analysis	Mathematic Model
Heating power (W)	51.3	48	43.09
Error	—	6.4%	16.1%

Thermal Resistance	$R_{7}$	$R_{8}$	$R_{9}$	$R_{10}$	$R_{11}$	$R_{12}$
Results	12.37	0.19	3.52	16.53	0.011	0.271
Thermal resistance	$R_{bhj - cov}$	$R_{bhj - rad}$	$R_{ckz - cov}$	$R_{ckz - rad}$	$R_{gj - cov}$	$R_{gj - rad}$
Results	0.97	1069	1.01	112.1	7.6	841

Abstract

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Applied Optics