THz Detection and Quantitative Analysis of Interlayer Air Gap in Power Insulators

Wentong Liu; Lijuan Li; Jiaojiao Ren; Jian Gu; Dandan Zhang; Shiyuan Kong; Qi Chen

doi:10.3788/LOP222661

Laser & Optoelectronics Progress, Volume. 60, Issue 21, 2112002(2023)

THz Detection and Quantitative Analysis of Interlayer Air Gap in Power Insulators

Wentong Liu^1,2,3, Lijuan Li^1,2,3、*, Jiaojiao Ren^1,2,3, Jian Gu^1,2,3, Dandan Zhang^1,2,3, Shiyuan Kong³, and Qi Chen³

Author Affiliations

¹Key Laboratory of Photoelectric Measurement and Optical Information Transmission Technology, Ministry of Education, Changchun University of Science and Technology, Changchun 130022, Jilin, China

²School of Opto-Electronic Engineering, Changchun University of Science and Technology, Changchun 130022, Jilin, China

³Zhongshan Institute of Changchun University of Science and Technology, Zhongshan 528400, Guangdong, China

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Figures & Tables(15)

Fig. 1. Model of terahertz (THz) wave propagation in interlayer air gap

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Fig. 2. Simulation signals of interlayer air gap defects

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Fig. 3. Process diagram of defect samples. (a) Gluing area; (b) rubber manufacturing process; (c) process diagram of samples

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Fig. 4. Real picture of samples

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Fig. 5. THz time domain spectral system. (a) Schematic diagram of optical path of THz imaging system; (b) diagram of THz detection system

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Fig. 6. Defect waveform analysis

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Fig. 7. Time-domain waveform of interlayer air gap with different thicknesses

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Fig. 8. Peak-to-peak time-of-flight images

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Fig. 9. THz energy integration images. (a) 1#; (b) 2#; (c) 3#; (d) 4#

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Fig. 10. THz binarization images. (a) 1#; (b) 2#; (c) 3#; (d) 4#

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Fig. 11. Sample disassembly diagram. (a) 1#; (b) 2#; (c) 3#; (d) 4#

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Fig. 12. Scanning images. (a) 1#; (b) 2#; (c) 3#; (d) 4#

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Table 1. Thickness of air gap between prefabricated layers
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Table 1. Thickness of air gap between prefabricated layers
Sample number Measured air gap thickness between layers Prefabricated air gap thickness between layers
1# 0.091 0.1
2# 0.184 0.2
3# 0.295 0.3
4# 0.372 0.4

Table 2. Results and errors of THz detection of interlayer air gap thicknesses
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Table 2. Results and errors of THz detection of interlayer air gap thicknesses
Sample number THz measurement thickness /mm Thickness meter detect thickness /mm Relative error /%
1# 0.087 0.091 4.39
2# 0.176 0.184 4.35
3# 0.281 0.295 4.75
4# 0.355 0.372 4.57

Table 3. Detection results and errors of interlayer air gap areas
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Table 3. Detection results and errors of interlayer air gap areas
Sample number THz detection area /mm² Scanner detection area /mm² Relative error /%
1# 387.00 399.752 3.19
2# 748.25 780.541 4.14
3# 578.75 600.121 3.56
4# 666.00 698.932 4.71

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Wentong Liu, Lijuan Li, Jiaojiao Ren, Jian Gu, Dandan Zhang, Shiyuan Kong, Qi Chen. THz Detection and Quantitative Analysis of Interlayer Air Gap in Power Insulators[J]. Laser & Optoelectronics Progress, 2023, 60(21): 2112002

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