Typical dimensional measurement applications
Electronic displacement sensors (LVDT)

High precision measurements in production lines can be accomplished with the use of air-electronic non-contact systems, contact electronic systems (using displacement transducers) or even a mixture of both technologies

The use of LVDT sensors are well suited for low volume production lines due to its high measurement range and flexibility to quick setup for new parts or different measurement applications

Metrolog's equipments should be used with one or more displacement sensors, as well a proper mechanical fixture based on the part geometry. Below a few examples of typical measurement applications with displacement electronic sensors:

 Aplicações LVDT

 

Outer diameter: one of the most common application; it uses one or two displacement sensors (differential mode) to detect the diameter size. The same setup may be used, if the part is rotated, to detect circularity. Aplicação de Medicão

 

Aplicação de Medicão Conicity: by moving the part longitudinally its is possible to inspect the conicity (using two sensors in differential mode). The same setup may be used to measure cilindricity or surface straightness.

 

Circular run out: by rotating the part on a differential sensor setup it is possible to inspect the circular run out of holes or shafts. Aplicação de Medicão

 

Aplicação de Medicão Aplicação de Medicão Thickness: it is based on the same setup used to measure outer diameters. The use of two sensors allows continuous inspection of part thickness. It is also possible to use the same configuration to inspect the part surface profile.

 

Perpendicularity: this measure may be obtained by using two sensors properly aligned on a mechanical fixture. The perpendicularity readout is the difference from both sensors signals. The same principle allow the measurement of parallelism or part inclination. Aplicação de Medicão

 

Aplicação de Medicão Flatness: one of the simplest application, it employs one displacement sensor perpendicular to the measured surface. The same setup may be used to measure surface rectitude or part profile.

 

Coaxiality: this measure may be obtained using two displacement sensors properly aligned on a mechanical fixture. The readout is the difference of the sensors signals. Aplicação de Medicão

 

Aplicação de Medicão Concentricity: applying one displacement sensor and a center guided fixture it is possible to measure concentricity errors.