We introduce the inspection of brake pad joint part for delamination and cavity by non contact air coupled ultrasonic inspection.
The brakes are necessary to reduce the speed and stop on moving vehicles such as railway cars, air plane, motorcycle elevator and so on.
The core of a brake is the brake pad. Conventional way of inspection of brake pad is hammering test, and there is the limitation of human hearing. It affects on inspector's health condition and feeling, so it is not a perfect to judge the quality.
Fig.1 to 4 are inspection results of brake pad in placing sandwiches of two probes/transducers by non contact air coupled ultrasonic inspection system (NAUT21). The picture shows the rejected part of delamination.