Surface density measurement apparatus and coating system

Abstract

The surface density measurement apparatus includes an emitter component, a first detector, and a second detector, with the emitter component configured to emit a ray toward a to-be-measured object. The first detector forms with the emitter component a first detection channel for the to-be-measured object to travel through. The first detector is capable of receiving the ray running through the to-be-measured object located in the first detection channel, to measure a surface density of the to-be-measured object. The second detector forms with the emitter component a second detection channel for the to-be-measured object to travel through. The second detector receives the ray running through the to-be-measured object located in the second detection channel, to measure a surface density of the to-be-measured object. The emitter component is configured to synchronously emit the ray toward the to-be-measured object entering the first detection channel and the to-be-measured object entering the second detection channel.

Dependencies are inferred from the claim text.