Optoelectronic techniques can be applied for the study of transparent objects, followed by the processing of the recorded images on a video camera, after the laser beam passes through the investigated object. In this paper we present our study on a polycarbonate plate with optical polished surfaces, subjected on mechanical stresses perpendicular to the laser beam propagation axis. The results of this study include the values for material constants. Three experimental arrangements were employed: a plane polariscope, a circular polariscope and an interferometric setup. The recorded images in coherent light contain fringes variation with increased mechanical stress. They are processed using our MATLAB codes to determine the state of the stress at various points in the investigated sample. The measurements in a polariscopic assembly demonstrate the photoelastic properties of this composite material. In the plane polariscope arrangement, we can visualize the main stress directions and also the points with equal maximum shear stress magnitude; in circular polariscope we can visualize only the points with equal maximum shear stress magnitude; and in the interferometric setup are highlighted the refractive index variations which are linked with the phase changes and the applied stress. We apply the shift theorem from the Fourier theory, on the experimental images from the interferometric setup and on simulated ones.
Digital holographic microscopy is a technique which enables real time monitoring of fast phenomena by using high
speed sensors of video cameras. Using this advantage, we obtain holographic images of flow in microcavities,
employing a CMOS video camera sensor with acquisition rate of 10 000fps. The corresponding reconstructed 3D image
for different flow conditions is obtained from a single hologram using simulations based on the Fresnel approximation.
We develop an automated image processing procedure in order to obtain quantitative information about the dynamic
contact angle evolution, the shape and velocity of an approximately 300μm wide portion from the water-air meniscus
interface in different microscopic cavity geometries.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.