Intensity Consistency Control Method for Multi-Wavelength Micro-Interferometry

Zhongsheng Zhai; Jiaojie Huang; Hang Zhao; Jinsong Li; Qinghua Lü; Xuanze Wang

doi:10.3788/LOP57.031202

Laser & Optoelectronics Progress, Volume. 57, Issue 3, 031202(2020)

Intensity Consistency Control Method for Multi-Wavelength Micro-Interferometry

Zhongsheng Zhai^1、*, Jiaojie Huang¹, Hang Zhao¹, Jinsong Li¹, Qinghua Lü², and Xuanze Wang¹

¹Hubei Key Laboratory of Modern Manufacturing Quantity Engineering, School of Mechanical Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China

²School of Science, Hubei University of Technology, Wuhan, Hubei 430068, China

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Figures & Tables(11)

Fig. 1. Schematic diagram of light intensity consistency interferometry system

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Fig. 2. Spectral characteristic curve of white light source

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Fig. 3. System control block diagram

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Fig. 4. LED driving circuit

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Fig. 5. Diagram of light intensity dynamic curve during switching process

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Fig. 6. System step response

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Fig. 7. Illuminance dynamic curve during wavelength rotation

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Fig. 8. Interferograms before and after intensity control. (a)(d) 510 nm interferograms before and after intensity control; (b)(e) 540 nm interferograms before and after intensity control; (c)(f) 640 nm interferograms before and after intensity control

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Fig. 9. Vertical grayscale projections before and after intensity control. (a) Before intensity control; (b) after intensity control

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Table 1. Light intensity adjustment schedule
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Table 1. Light intensity adjustment schedule
Serial number t₂ /s t₃ /s
1 2.36 1.62
2 2.22 1.62
3 2.30 1.76
4 2.20 1.62
5 2.24 1.70

Table 2. Visibility of three-wavelength interference image

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Table 2. Visibility of three-wavelength interference image

Wavelength /nm	Before intensity control	After intensity control
Wavelength /nm	Maximumgray value		Minimumgray value		K	Maximumgray value	Minimumgray value		K
510	24077	4548		0.68		9860	2919	0.54
540	72338	9020		0.78		10345	2929	0.56
640	11996	3017		0.60		10360	3027	0.55

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Zhongsheng Zhai, Jiaojie Huang, Hang Zhao, Jinsong Li, Qinghua Lü, Xuanze Wang. Intensity Consistency Control Method for Multi-Wavelength Micro-Interferometry[J]. Laser & Optoelectronics Progress, 2020, 57(3): 031202

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