Fig. 1. Scheme of measurement volume and signal produced by measured volume of tracer particle

Fig. 2. Optical absorption coefficient of water

Fig. 3. Particle size distribution of various components in seawater (size range is 10^-10-10^-2 m)

Fig. 4. Logarithmic plot of approximate abundances of major groups of microorganisms in open ocean

Fig. 5. Size distribution of suspended particulates at different depths in western North Atlantic

Fig. 6. Particle volume fraction profiles at North Atlantic and South Pacific for particle size range of 1-100 μm. (a) North Atlantic; (b) South Pacific

Fig. 7. System parameters (including fringe distance inside measurement volume and focus of lens distance of launching system) calculated based on size distribution of particles

Fig. 8. Velocity ratio and velocity error varying with circular frequency of suspended particles with different diamater for ρ=1.03 g/cm³. (a) Velocity ratio; (b) velocity error

Fig. 9. Velocity ratio and velocity error varying with circular frequency of suspended particles with different diamater for ρ=2.65 g/cm³. (a) Velocity ratio; (b) velocity error

Fig. 10. Mie scattered light intensity distribution of particulates with refractive index of 1.15

Fig. 11. Particle occurrence frequency captured by LDCP system within unit time

Fig. 12. Flow velocity measured by propeller type current meter and LDCP system at about 1 m above seafloor over time

Fig. 13. Results obtained by LDCP system and propeller type current meter