AN OPTICAL SENSOR FOR LOCAL STRAIN MEASURING OF AN OBJECT BY MEANS OF A SPECKLE CORRELATION METHOD

P. Horvath(a), P. Smid(b), M. Hrabovsky(a), and I. Hamarova(b) ((a) Palacky University, Faculty of Science, RCPTM, Joint Lab. of Optics, Olomouc, (b) Institute of Physics of the Academy of Sciences of the Czech Republic, Joint Lab. of Optics, Olomouc, Czech Republic): An Optical Sensor for Local Strain Measuring of an Object by Means of a Speckle Correlation Method The paper presents design of an optical sensor and its experimental verification for non-contact detection and quantitative evaluations of a local strain of a rubber specimen by a speckle correlation method. The presented optical method gives results comparable with the ones obtained by means of electromechanical method using electronic position transducer. Non-contact and non-destructive measuring is one of the sensor's advanteges. Next sensitivity and accuracy of measurement is defined through geometrical and optical parameters of the designed sensor and measurement runs in quasi-real time.