A Holographic Pattern Measuring System (HPMS) and Its Application to the Thermal Deformation of an Electrical Contact Spring

The HPMS is a technique developed by the authors which can measure the vibration or deformation of any object by means of the holographic interferogram analysis. This technique was applied to the microscopic displacement of an electric contact spring which was thermally deformed due to contact current. A deformed contact spring shape was obtained with an accuracy of 0.16/spl mu/m, and it was proved that the HPMS was a very good technique for measuring a microscopic movement of the object such as a fretting phenomenon in electric contacts.