Radiation Tolerant 3D Laser Scanner for Structural Inspections in Nuclear Reactor Vessels and Fuel Storage Pools

Figure 1

Normalized backscattered power vs. laser modulation frequency measured for different water attenuation coefficients: (●) k = 0.5 m⁻¹, (○) k = 1.1 m⁻¹, and (■) k = 2.1 m⁻¹. The continuous curve is the plot of Butterworth’s filter function in equation (2) for k = 0.5 m⁻¹.