John Sheridan, Gerald Byrne, Patrick Connolly, Brian Glennon, Conor Heneghan, David Fitzpatrick, Donal Finn, Michael Gilchrist, Patricia Kieran, Frank McLoughlin, Brian Mulkeen, Neal Murphy, William O'Connor, Ronan O'Dowd, Mark O'Malley, Malachy O'Rourke, Richard Reilly
Undergraduate students within many of the departments which make up the Faculty of Engineering and Architecture at University College Dublin meet optics, optical inspection techniques and opto-electronics at various times during their standard four year undergraduate degree course. As well as optics fundamentals taught as part of their physics courses, engineering courses specifically concerning optics and opto-electronics are available. Furthermore many graduate students are involved in either projects, which are completely optics based, or carry out research projects involving the use or development of specific optical instruments. These projects include the development of image processing capture and processing software, high power laser machining of materials, design and testing of lasers for fiber optic telecommunication and sensing applications and photochemistry. In this paper we offer a brief review of some of the main optical educational themes covered within our faculty and present some details regarding a few optics based postgraduate research projects.
A method for registering pairs of digital ophthalmic images of the retina is presented using anatomical features as control points present in both images. The anatomical features chosen are blood vessel crossings and bifurcations. These control points are identified by a combination of local contrast enhancement, and morphological processing. In general, the matching between control points is unknown, however, so an automated algorithm is used to determine the matching pairs of control points in the two images as follows. Using two control points from each image, rigid global transform (RGT) coefficients are calculated for all possible combinations of control point pairs, and the set of RGT coefficients is identified. Once control point pairs are established, registration of two images can be achieved by using linear regression to optimize an RGT, bilinear or second order polynomial global transform. An example of cross-modal image registration using an optical image and a fluorescein angiogram of an eye is presented to illustrate the technique.
The time course of the velocity of vibration was measured in individual sensory cells (outer hair cells and Hensen's cells from the third and fourth turns of a guinea-pig temporal-bone preparation) for a variety of applied acoustic stimuli. The methods of preparation and interferometric measurement have been described earlier. To observe the cell's response for a continuous and large range of acoustic intensities, an amplitude modulated tone with fixed modulation characteristics and a wide range of carrier frequencies fc was used. The peak acoustic intensities of the applied tones were in excess of 90 dB:re .0002 dynes/cm2, which is at the high intensity end of the hearing range of most mammals. A spectrogram was used to analyze the velocity response of the cell. This is a 3D representation that exhibits the time evolution of the amplitudes of all of the spectral components in the response.
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.