Design of Strain and Temperature Field Endoscopic Detection System for Hot-End Components of Aircraft

Hao Wang; Kun Du; Zhiming Xie; Jing Zhu; Huijie Huang

doi:10.3788/LOP241083

Laser & Optoelectronics Progress, Volume. 62, Issue 1, 0122002(2025)

Design of Strain and Temperature Field Endoscopic Detection System for Hot-End Components of Aircraft

Hao Wang^1,2、*, Kun Du¹, Zhiming Xie³, Jing Zhu¹, and Huijie Huang¹

¹Laboratory of Information Optics and Optoelectronic Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

²University of Chinese Academy of Sciences, Beijing 100049, China

³Shanghai Lasensor Optoelectronics Technology Co., Ltd., Shanghai 201821, China

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Figures & Tables(13)

Fig. 1. Schematic diagram of working state of probe

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Fig. 2. Schematic diagram of working principle of probe

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Fig. 3. Schematic diagram of optimized probe optical system

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Fig. 4. Spot diagrams of imaging channels. (a) λ=440 nm; (b) λ=530 nm

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Fig. 5. Distortion curve graphs

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Fig. 6. MTF curves and relative illuminance curves under different wavelengths. (a)(c) λ=440 nm; (b)(d) λ=530 nm

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Fig. 7. Simulated image results at 20 ℃. (a) Test images; (b) λ=440 nm; (c) λ=530 nm

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Fig. 8. MTF curves at different temperatures. (a) T′=50 ℃, λ=440 nm; (b) T′=50 ℃, λ=530 nm; (c) T′=150 ℃, λ=440 nm; (d) T′=150 ℃, λ=530 nm; (e) T′=250 ℃, λ=440 nm; (f) T′=250 ℃, λ=530 nm

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Table 1. Technical parameters

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Table 1. Technical parameters

Parameter	Value
Working distance /mm	90
Field of view /（mm×mm）	>8×8
Distortion /%	<0.1
Resolution	>0.3（cut-off frequency is 40 lp/mm）
Wavelength /nm	（440±20），（530±20）， and （1600±50）
Optical aperture /mm	<10
Image height （temperature channel） /mm	<1
Image height （imaging channel） /mm	>25

Table 2. Main optical parameters of imaging channels

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Table 2. Main optical parameters of imaging channels

Parameter	Value（λ=440 nm）	Value（λ=530 nm）
Working distance /mm	87	90
Entrance pupil diameter /mm	9.27	9.89
Working f-number	16.75	17.28
Object space NA	0.044	0.042
Image height /mm	14.68	14.67
Focal length /mm	-62.62	-67.77
Total track /mm	828.39	819.27

Table 3. Main optical parameters of temperature measurement channels
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Table 3. Main optical parameters of temperature measurement channels
Parameter Value
Working distance /mm 87
Entrance pupil diameter /mm 9.27
Working f-number 16.75
Object space NA 0.044
Image height /mm 0.8
Total track /mm 816.62

Table 4. Tolerance setting
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Table 4. Tolerance setting
Tolerance Value
Aperture 3
Sample tolerance A
Surface irregularity /fringes 0.3
Thickness /mm ±0.05
Element decenter /mm ±0.01
Tilt /（°） ±0.02
Refractive index 0.001
Abbe number /% 1

Table 5. Monte Carlo sampling analysis results
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Table 5. Monte Carlo sampling analysis results
Sampling ratio /% MTF（λ=440 nm） MTF（λ=530 nm）
≥90 0.30 0.33
≥80 0.35 0.37
≥50 0.42 0.39
≥20 0.47 0.40
≥10 0.49 0.41

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Hao Wang, Kun Du, Zhiming Xie, Jing Zhu, Huijie Huang. Design of Strain and Temperature Field Endoscopic Detection System for Hot-End Components of Aircraft[J]. Laser & Optoelectronics Progress, 2025, 62(1): 0122002

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