Experimental study of scattering angle for large-scale turbidity measurement

Table 1. Experimental standard solution and scattering angles
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Table 1. Experimental standard solution and scattering angles
标准液浊度/NTU 0 100 150 250 500 800
散射角度θ/（°） 0 11 25 45 60 75
标准液浊度/NTU 1000 1250 1500 1800 2000
散射角度θ/（°） 90 105 120 135 145

Table 2. Minimum fitting order with fitting error less than 5%
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Table 2. Minimum fitting order with fitting error less than 5%
散射角度θ/（°）拟合所需最小阶数最大误差/%
45 6 4.65
60 4 4.97
75 3 4.53
90 2 4.35
105 2 3.35
120 2 3.19
135 1 4.22
145 3 4.33

Table 3. Segmentation fitting of 135° scattering light signal
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Table 3. Segmentation fitting of 135° scattering light signal
浊度/NTU 斜率 $R^{2}$
100～2 000 0.517 2 0.97
100～800 0.753 2 0.99
800～1 500 0.505 6 0.98
1 500～2 000 0.342 6 0.99

Table 4. Segmentation fitting after reducing 135° scattered path
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Table 4. Segmentation fitting after reducing 135° scattered path
浊度/NTU 斜率 $R^{2}$
100～2 000 0.683 5 0.97
100～800 1.013 3 0.98
800～1 500 0.573 2 0.99
1 500～2 000 0.526 4 0.98

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Li ZHEN, Naiyi GE, Haitao ZHANG, Yelong ZHENG, Meirong ZHAO, Yinguo HUANG. Experimental study of scattering angle for large-scale turbidity measurement[J]. Journal of Applied Optics, 2024, 45(4): 768

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