Werth Inc. (Old Saybrook, CT), a manufacturer of precision measurement equipment, introduced the Chromatic Focus Point (CFP) sensor, a highly accurate optical distance sensor that is largely insensitive to surface condition. A typical application is determining flatness.
The CFP sensor can measure dimensional, shape and positional deviations at high point density. A large measurement range up to 6 mm allows for rapid scanning, as the sensor does not need to track along the surface in order to maintain contact. Alternatively, controlled scanning with automatic tracking of the work-piece surface is possible for severe deviations from the prescribed path. Flatness, warping and distortion of surfaces can be measured quickly and accurately with the sensor, which achieves probing errors as low as 0.25 µm in the Z direction. Layer thicknesses can also be determined for transparent materials.
Because of its working principle, the sensor is not significantly affected by the contrast or reflective properties of the work-piece surface. This makes the CFP nearly independent of the surface condition, so it can be used with transparent, diffusive and highly reflective surfaces, such as those found in tool making, electronics manufacturing and precision optics. In addition to embossing dies, co-planarity of solder points on plug connectors and highly accurate watch plates, the CFP measures functional optical surfaces such as lenses and mirrors. The linear Chromatic Focus Line sensor (CFL) uses the same measurement principle to capture the entire work-piece surface in 3D.
Various sensor heads are available for different precision, surface angle and measurement speed requirements. For high-precision requirements, it can be combined with the Werth VideoCheck UA multi-sensor coordinate measuring machine.