A deep aspheric wavefront produces many interference fringes even when the optimum defocusing term is selected. The large number of fringes imposes a limit to the degree of asphericity that may be measured. A procedure using several interferograms with several defocusing values is described.
Using the rainbow effect produced by employing a white light source in the reconstruction step of an image hologram, it is possible to obtain colored two-dimensional images. In this work a holographic technique to obtain pseudocolored schlieren images is proposed. The method is based on recording three image holograms consecutively on the same photographic plate using a He-Ne laser and three different reference beams, each one with a different angle with respect to the axis of the optical system. Each image hologram is recorded with a different position of the knife-edge into a conventional schlieren system. The multiplexed image hologram thus obtained gives different color information which is associated with the phase variations of the object under test, when it is illuminated by a conventional white light source, in the reconstruction step. Comparing this work with the conventional color schlieren system, color filters are not necessary and the images obtained can have good contrast and bright colors. Experimental results are shown.
Proceedings Volume Editor (1)
This will count as one of your downloads.
You will have access to both the presentation and article (if available).
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.