Frequently Asked Questions about Laser Doppler Vibrometer

The reflective sheet is a sheet that has the function of reflecting light towards the light source direction through recursive reflection (an optical phenomenon where incident light returns in the direction of incidence).

Structurally, it consists of a thin and flexible sheet with a thickness of 100 to 300 μm, in which numerous small high-refractive glass beads with a diameter of about 100 μm are uniformly arranged to fulfill a specific effect, acting as lenses. Each glass bead acts as a convex lens in the shape of a perfect sphere. The incident light passes through the glass body, refracts, and focuses at a point, but a reflective layer is provided at the bottom of the sphere, redirecting the light back towards the original light source after passing through the glass body again.

Structure of reflective sheet

The mechanism of reflective sheets.