The use of laser scattering and energy harvesting technology for fire evacuation

► A hollow propeller-type turbine rotor harvests water energy to generate power. ► A green laser was used and the projection dimension was identical to the design. ► The percentage decreases are 7.5%, 7.4%, 7.5%, 7.5% and 7.2%, respectively. ► The ergonomics of the holography allows the actual pattern to be seen clearly. ► Types of customization of this study can establish an ideal safety network.