Brake disc topography measurement

In the automotive industry, brake disc testing is carried out in order to check the wear of the brake pads. They can be made from a variety of materials such as grey cast iron or ceramics.  If a brake disc has been made with ceramics, it is more likely to exhibit great response characteristics, braking power and component weight reduction. To measure any wear in the brake pads, several tests are conducted. The major challenge faced during these tests is the changing surface structure such as matt, glossy, rough or smooth.

Laser traingulation sensors are used in this process to detect wear of the brake pads. The testing process requires the brake disc to rotate at a realistic driving speed of up to 100km/h. The brake pad is also pushed against the disc at up to 40 bar pressures. The laser sensor monitors the resultant forces in the X/Y/Z axes. For doing this, the brake disc is then clamped and rotated in a 1-degree grid. The sensor is attached to a table that can be moved in the X/Y axes to perform measurement. The sensor also moves acorss the brake disc and scans it at a speed of up to 50 kHz. This measurement result is stored in a PC using Configuration Tool software.

The high precision laser sensor can detect even a small crack in a new low-wear material. This sensor enables measurement of fast objects by means of its ability to adjust measuring rates. With the integration with all the electronics, the laser triangulation sensor is also suitable for installing in restricted spaces.