Three-dimensional shape measuring apparatus using shadow moire

Abstract

A 3D shape measuring apparatus using a shadow moire, which can measure a 3D shape of a test object by selectively switching on/off a plurality of illuminating parts irrespective of a form of the test object is provided. The 3D shape measuring apparatus using the shadow moire includes a grating, a grating moving part, a beam splitter partbeing provided above the gratingto direct a first light source towards the gratingor pass a reflected image of a test objectreflected via the grating, a subsidiary illuminating partbeing provided on one surface of the beam splitter partto emit the first light towards the beam splitter part, an image sensorbeing provided above the beam splitter partto take the reflected image having passed through the beam splitter part, a plurality of illuminating partsbeing inclined a predetermined angle of the viewing axis of the image sensorto be positioned above the gratingand to be spaced apart from each other with an equivalent angle and emit a second light towards the grating, and a control partcontrolling the grating moving part, the subsidiary illuminating part, the image sensor, and the plurality of illuminating parts, and thereby, transferring the image which is captured by the image sensor, in order to calculate a 3D shape of the test object, and controlling the plurality of illuminating partsto be selectively switched on/off according to a shape of the test object