CURVATURE PATTERNS OF BENDING PLATES BY SPECKLE-SHEARING INTERFEROMETRY

【摘要】 <正> This paper describes a method to obtain the curvature and twist patterns of a bending plateby combining optical cartier technique and digital image processing.A carrier consisting of parallel fringes isobtained in double-exposure by changing the illumination form so that the deflection of the plate is recordedas the modulation to the carrier frequency.After optical filtering the modulated cartier is input into a digitalimage processing system to generate a grey image of ‘deformed grating’,whose digital differentiation can beused to obtain the curvature patterns or the twist patterns.更多还原

【Abstract】 This paper describes a method to obtain the curvature and twist patterns of a bending plate by combining optical cartier technique and digital image processing.A carrier consisting of parallel fringes is obtained in double-exposure by changing the illumination form so that the deflection of the plate is recorded as the modulation to the carrier frequency.After optical filtering the modulated cartier is input into a digital image processing system to generate a grey image of ‘deformed grating’,whose digital differentiation can be used to obtain the curvature patterns or the twist patterns.更多还原