Preliminary Testing of Chlorophyll-a Concentration on Offshore Surface Based on Oceanographic Lidar

Feng Zhang; Jinjia Guo; Zhigang Li; Xiaoning Luan

doi:10.3788/LOP56.051201

Journals >Laser & Optoelectronics Progress >Volume 56 >Issue 5 >Page 051201 > Article

Laser & Optoelectronics Progress
Vol. 56, Issue 5, 051201 (2019)

Preliminary Testing of Chlorophyll-a Concentration on Offshore Surface Based on Oceanographic Lidar

Feng Zhang^1、2, Jinjia Guo¹, Zhigang Li³, and Xiaoning Luan^1、*

Author Affiliations

¹ College of Information Science & Engineering, Ocean University of China, Qingdao, Shandong 266100, China;

² Institute of Marine Instrumentation, Shandong Academy of Sciences, Qingdao, Shandong 266100, China

³ School of Physics and Optoelectronic Engineering, Ludong University, Yantai, Shandong 264025, China

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DOI: 10.3788/LOP56.051201 Cite this Article Set citation alerts

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 Copy Citation Text

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Fig. 1. Structural diagram of TOLRSS

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Fig. 2. Fitting result of detection data obtained by lidar and chlorophyll fluorometer

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Fig. 3. TOLRSSboard on fishing ship

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Fig. 4. Typical echo signals of TOLRSS acquired with oscilloscope

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Fig. 5. Linear fitting of chlorophyll-a concentration measured by lidar and fluorometer

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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

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Fig. 7. Concentration distribution of chlorophyll-a

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Device name	Parameter	Value
Laser(DPS-532-ANd∶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 (HamamatsuH10721 photomultiplier)	Input voltage /V	4.5-5.5
Detector (HamamatsuH10721 photomultiplier)	Radiation power sensitivity /(A·W^-1)	2.2×10⁵
Oscilloscope (TELEDYNELECROY 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
Collecting lens (Fresnel lens)	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
Volume and power consumption	Power consumption /W	<400

Table 1. Technical indexes of TOLRSS

Dataseries	Results of chlorophyllconcentration measured byfluorometer /(μg·L^-1)	Standard deviation ofconcentration measured byfluorometer /(μg·L^-1)	Results of chlorophyllfluorescence strengthmeasured by lidar /arb. units	Standard deviation ofstrength measuredby 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

Table 2. Synchronous detection data obtained by lidar and chlorophyll fluorometer

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