Attenuation characterization of 532 nm and 1064 nm laser propagating in rain

Three-Dimensional Imaging and Reconstructions of Objects Under Rainy Conditions Using the Generation and Propagation of Coherent Structured Signal

“…We should also point out that the artificial rain condition generated and employed in our investigation may differ from the natural rainy condition. Actually the attenuation coefficients that we measured for different rainfall values of the artificial rain condition had approximately agreed with the published data [40], [41], which might suggest that our method for generating the artificial rain condition was reasonable and useful based on the analysis in part C of section II above.…”

“…while µ is measurable in practical experiments. Note that, the extinction coefficient µ in ( 5) is dominated by the scattering process of rain drops at 532 nm [40], [41], which means that σ a ≈ 0 and µ ≈ σ s at the wavelength that we have used in this work. The calculation of σ s is based on the data of rain-drop-size distribution and the cross section, while such statistical data is difficult to obtain due to the varying rainfall and dynamic environmental conditions.…”

Laser backscattering of multi-scaled large particles based on superimposed scattering

“…Obviously, compared with the spherical section, this model is more extensive. The previous findings indicates that, for non-absorptive particles, the rays p ⩾ 2 can be neglected and only the contributions of rays p = 0 and p = 1 to the total intensity function are considered [21]. Therefore, the backscattering intensity of large particles can be calculated directly by the reflected light of the laser beam on the particle surface.…”