Frequently Asked Questions about Laser Doppler Vibrometer

A reflective sheet is a sheet that has the function of reflecting light back towards the light source through retroreflection (a special optical reflection mechanism in which incident light returns to the direction of incidence).

Structurally, it consists of a thin, flexible sheet-like structure with an overall thickness of 100 to 300 μm, in which numerous tiny, high-refractive-index glass beads, approximately 100 μm in diameter, are uniformly arranged in a binding resin to achieve a certain effect. Each glass bead is a perfect sphere and acts as a type of convex lens. Incident light passes through the glass body, is refracted, and focuses at a single point, but a reflective layer is provided at the bottom of the sphere, and the light passes through the glass body again and returns to the original direction of the light source.

Structure of reflective sheet

How reflective sheets work