Relationship analysis between transient thermal control mode and image quality for an aerial camera

Weiyi Liu; Yongsen Xu; Yuan Yao; Yulei Xu; Honghai Shen; Yalin Ding

doi:10.1364/AO.56.001028

Applied Optics
Vol. 56,
Issue 4,
pp. 1028-1036
(2017)
•https://doi.org/10.1364/AO.56.001028

Relationship analysis between transient thermal control mode and image quality for an aerial camera

Weiyi Liu, Yongsen Xu, Yuan Yao, Yulei Xu, Honghai Shen, and Yalin Ding

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Weiyi Liu, Yongsen Xu, Yuan Yao, Yulei Xu, Honghai Shen, and Yalin Ding, "Relationship analysis between transient thermal control mode and image quality for an aerial camera," Appl. Opt. 56, 1028-1036 (2017)

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Table of Contents Category
- Instrumentation, Measurement, and Metrology
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About this Article
History
- Original Manuscript: May 26, 2016
- Revised Manuscript: October 11, 2016
- Manuscript Accepted: November 25, 2016
- Published: January 27, 2017

Abstract

Thermal control and temperature uniformity are important factors for aerial cameras. This paper describes the problems with existing systems and introduces modifications. The modifications have improved the temperature uniformity from 12.8°C to 4.5°C, and they enable images to be obtained at atmospheric and low pressures (35.4 KPa). First, thermal optical analysis of the camera is performed by using the finite element analysis method. This modeled the effect of temperature level and temperature gradient on imaging. Based on the results of the analysis, the corresponding improvements to the thermal control measures are implemented to improve the temperature uniformity. The relationship between the temperature control mode and temperature uniformity is analyzed. The improved temperature field corresponding to the thermal optical analysis is studied. Taking into account that the convection will be affected by the low pressure, the paper analyzes the thermal control effect, and imaging results are obtained in low pressure. The experimental results corroborate the analyses.

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Distribution	Size (mm)	Number	Power (W)
Primary mirror holder	$100 \times 40$	3	15
Secondary mirror holder	$Φ 80$	1	20
Main tube (X axis)	$600 \times 100$	4	60
Main tube (Y axis)	$100 \times 100$	8	32

Sensor Location	Temperature (°C)
Primary mirror	19.3
Secondary mirror	18.2
Third mirror	19.8
Primary mirror holder	20.3
Secondary mirror holder	20.1
Lens barrel	21.3

	SA	TCO	TAS	SAS
(a) Temperature level difference of 20°C
1	−5.097138	0.835460	−0.040494	−0.010064
STO	2.477660	−0.426739	0.016333	0.000000
3	0.059987	−0.022638	0.002609	0.000711
4	0.016421	0.007955	0.001457	0.000601
5	0.050710	0.099392	0.074688	0.031396
6	−0.018237	−0.048523	−0.048741	−0.020051
7	−0.239838	−0.164970	−0.043400	−0.018184
8	0.003780	0.018761	0.021384	0.000694
9	−0.005835	0.015879	−0.007361	0.002242
10	0.141540	0.087551	0.021507	0.009472
11	−0.005124	0.013477	−0.007936	−0.000059
12	0.015776	−0.010174	0.002187	0.000729
13	−0.015437	0.009955	−0.002140	−0.000713
SUM	−2.615735	0.415387	−0.009907	−0.003226
(b) Temperature gradient of 20°C
1	−5.097138	3.302527	−0.632756	−0.157252
STO	2.477660	−1.686876	0.255219	0.000000
3	0.059987	−0.089486	0.040768	0.011103
4	0.016421	0.031444	0.022769	0.009390
5	0.050710	0.392892	1.167054	0.490591
6	−0.018237	−0.191807	−0.761613	−0.313311
7	−0.239838	−0.652115	−0.678163	−0.284143
8	0.003780	0.074160	0.334146	0.010847
9	−0.005835	0.062769	−0.115021	0.035028
10	0.141540	0.346086	0.336063	0.148012
11	−0.005124	0.053273	−0.124013	−0.000920
12	0.015776	−0.040217	0.034175	0.011392
13	−0.015437	0.039352	−0.033440	−0.011147
SUM	−2.615735	1.642001	−0.154811	−0.050412

Sensor Location	Analytical Temperature (°C)
Primary mirror	19.0
Secondary mirror	17.6
Third mirror	19.7
Primary mirror holder	20.1
Secondary mirror holder	20.7
Lens barrel	21.4

	SA	TCO	TAS	SAS
1	−5.097138	1.981388	−0.227762	−0.056603
STO	2.477660	−1.012060	0.091867	0.000000
3	0.059987	−0.053688	0.014675	0.003997
4	0.016421	0.018865	0.008196	0.003380
5	0.050710	0.235720	0.420085	0.176590
6	−0.018237	−0.115077	−0.274145	−0.112777
7	−0.239838	−0.391244	−0.244107	−0.102278
8	0.003780	0.044493	0.120277	0.003904
9	−0.005835	0.037659	−0.041402	0.012608
10	0.141540	0.207638	0.120967	0.053277
11	−0.005124	0.031962	−0.044639	−0.000331
12	0.015776	−0.024129	0.012301	0.004100
13	−0.015437	0.023610	−0.012037	−0.004012
SUM	−2.615735	0.985136	−0.055725	−0.018146

	Fan	Thermoelectric Chip
Rated Voltage (V)	12	12
Operating Voltage (V)	$7 \sim 13.8$	$8.6 \sim 15.4$
Rated Current (A)	0.1	2.1
Max. Airflow (CFM)	8.0	—
Power (W)	1.2	25.2
Size(mm)	$40 \times 40 \times 28$	$30 \times 30 \times 4$

	SA	TCO	TAS	SAS
1	−5.097138	0.264176	−0.004049	−0.001006
STO	2.477660	−0.134936	0.001633	0.000000
3	0.059987	−0.007158	0.000261	0.000071
4	0.016421	0.002515	0.000146	0.000060
5	0.050710	0.031428	0.007468	0.003139
6	−0.018237	−0.015343	−0.004873	−0.002005
7	−0.239838	−0.052164	−0.004339	−0.001818
8	0.003780	0.005932	0.002138	0.000069
9	−0.005835	0.005021	−0.000736	0.000224
10	0.141540	0.027684	0.002150	0.000947
11	−0.005124	0.004261	−0.000794	−0.000006
12	0.015776	−0.003217	0.000219	0.000073
13	−0.015437	0.003148	−0.000214	−0.000071
SUM	−2.615735	0.131347	−0.000991	−0.000323

	SA	TCO	TAS	SAS
1	−5.097138	0.330220	−0.006326	−0.001572
STO	2.477660	−0.168671	0.002552	0.000000
3	0.059987	−0.008948	0.000408	0.000111
4	0.016421	0.003144	0.000228	0.000094
5	0.050710	0.039285	0.011668	0.004905
6	−0.018237	−0.019179	−0.007615	−0.003132
7	−0.239838	−0.065205	−0.006780	−0.002841
8	0.003780	0.007415	0.003341	0.000108
9	−0.005835	0.006276	−0.001150	0.000350
10	0.141540	0.034605	0.003360	0.001480
11	−0.005124	0.005327	−0.001240	−0.000009
12	0.015776	−0.004021	0.000342	0.000114
13	−0.015437	0.003935	−0.000334	−0.000111
SUM	−2.615735	0.164184	−0.001548	−0.000504

Abstract

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Figures (15)

Tables (8)

Equations (7)

Applied Optics