Siying Chen, Wei Hao, He Chen, Pan Guo, Qingyue Xu, Fan Xue. Application of Piecewise Intensity Transformation in Aerosol Flow Field Detection Based on Planar Laser-Induced Fluorescence[J]. Laser & Optoelectronics Progress, 2024, 61(4): 0401001
- Laser & Optoelectronics Progress
- Vol. 61, Issue 4, 0401001 (2024)
Fig. 1. Schematic of aerosol concentration distribution plane detection system
Fig. 2. Signal and histogram. (a) The original signal; (b) result of histogram equalization; (c) result of preprocessing; (d) histogram of the original signal; (e) histogram of Fig. 2(b); (f) histogram of Fig. 2(c)
Fig. 3. Flow chart of signal processing
Fig. 4. The original signal of aerosol flow field. (a)‒(e) Exhalation for 1 s, 15 s, 30 s, 50 s, 52 s; (f)‒(j) sedimentation for 1 s, 2 s, 6 s, 48 s, 60 s
Fig. 5. Processing results of aerosol flow field signal. (a) Preprocessed signal; (b) order assignment; (c) order squared assignment; (d) CLAHE
Fig. 6. Intensity transformation. (a) Order assignment; (b) order squared assignment
Fig. 7. Application of order squared assignment. (a) Signal with background noise; (b) result of order squared assignment applied on the signal in Fig. 7 (a)
Fig. 8. Results of order assignment applied on the signal in Fig.4. (a)‒(e) Exhalation for 1 s, 15 s, 30 s, 50 s, 52 s; (f)‒(j) sedimentation for 1 s, 2 s, 6 s, 48 s, 60 s
Fig. 9. Comparison of original signals and processed signals. (a)‒(d) Original signals ; (e)‒(h) processed signals
Fig. 10. Signal area and RSB. (a) Schematic of signal areas; (b) RSB of signal with different processing
Fig. 11. The RSB of weak signals with different exhalation time processed by different processing
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Table 1. Specification chart of the aerosol concentration distribution plane detection system
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Table 2. Elapsed time of piecewise intensity transformation
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