Laser & Optoelectronics Progress, Volume. 56, Issue 5, 051201(2019)
Preliminary Testing of Chlorophyll-a Concentration on Offshore Surface Based on Oceanographic Lidar
Figures & Tables(9)
Fig. 2. Fitting result of detection data obtained by lidar and chlorophyll fluorometer
Fig. 5. Linear fitting of chlorophyll-a concentration measured by lidar and fluorometer
Fig. 6. Comparison of stability for measurement of chlorophyll-a concentration by fluorometer and TOLRSS in site 1. (a) Measured by TOLRSS; (b) measured by fluorometer
Table 1. Technical indexes of TOLRSS
View tableTable 1. Technical indexes of TOLRSS
Device name Parameter Value Laser (DPS-532-A Nd∶YAG pulse laser) Wavelength /nm 532 Single pulse output energy /mJ 0-5 Pulse width /ns <10 Output frequency /Hz 1-10 Laser spot diameter /mm 3 Beam divergence angle /mrad <3 Detector (Hamamatsu H10721 photomultiplier) Input voltage /V 4.5-5.5 Radiation power sensitivity /(A·W-1) 2.2×105 Oscilloscope (TELEDYNE LECROY HDO4000) Number of detection channels 4 Detection bandwidth /MHz 350 Sampling rate /GHz 2.5 Sampling depth /bit 12 Collecting lens (Fresnel lens) Diameter /mm 100 Focal length /mm 80 Filter (bandpass filters) 532 nm filter: Central wavelength transmittance /% ≥ 30 Full width half maximum /nm 1 650 nm filter: Central wavelength transmittance /% ≥ 80 Full width half maximum /nm 15 685 nm filter: Central wavelength transmittance /% ≥ 80 Full width half maximum /nm 15 Field of view/ mrad 6.25 Volume and power consumption Size specification /(cm×cm×cm) 60×60×150 Power consumption /W <400
Table 2. Synchronous detection data obtained by lidar and chlorophyll fluorometer
View tableTable 2. Synchronous detection data obtained by lidar and chlorophyll fluorometer
Data series Results of chlorophyll concentration measured by fluorometer /(μg·L-1) Standard deviation of concentration measured by fluorometer /(μg·L-1) Results of chlorophyll fluorescence strength measured by lidar /arb. units Standard deviation of strength measured by lidar /arb. units 1 0.914 0.049 0.888 0.010 2 1.401 0.055 0.894 0.027 3 2.094 0.058 0.927 0.022 4 2.487 0.046 0.949 0.008 5 3.497 0.061 0.987 0.020 6 4.227 0.045 1.016 0.013 8 4.939 0.059 1.013 0.022 9 5.374 0.048 1.039 0.023 10 6.039 0.061 1.059 0.017
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Feng Zhang, Jinjia Guo, Zhigang Li, Xiaoning Luan. Preliminary Testing of Chlorophyll-a Concentration on Offshore Surface Based on Oceanographic Lidar[J]. Laser & Optoelectronics Progress, 2019, 56(5): 051201
Paper Information
Category: Instrumentation, Measurement and Metrology
Received: Jun. 27, 2018
Accepted: Sep. 21, 2018
Published Online: Jul. 31, 2019
The Author Email: Luan Xiaoning (luanxiaoning@ouc.edu.cn)
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