Please wait, while we are loading the content...
| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Yamada, K. Sugiyama, T. Shimizu, H. |
| Copyright Year | 1988 |
| Description | Author affiliation: Dept. of Electr. Commun., Tohoku Univ., Sendai, Japan (Yamada, K.; Sugiyama, T.; Shimizu, H.) |
| Abstract | The authors propose a combined acoustic and optical microscope-lens of planar structure which is intended to meet the demand for simultaneously obtaining both an acoustic image and its optical counterpart. The lens is created by combining a Fresnel-zone-type acoustic lens with a rod-type gradient-index optical lens (SELFOC). A piezoelectric thin-film transducer having a pinhole at its center is deposited on one end of the rod lens for generation of ultrasound. A number of annular grooves designed according to the theory of the Fresnel zone plate are formed on the other end of the rod for converging the acoustic wave in water. A beam from a He-Ne laser source is guided into the lens through the pinhole and converges owing to the gradient of the refractive index. After passing through the central ungrooved zone of the acoustic Fresnel lens, the optical beam focuses on a spot in water outside the rod. By designing the length of the rod properly, the focal spot of the optical beam is set to coincide with that of the acoustic beam. The design and fabrication of the lens are described, and results of some preliminary experiments on the simultaneous observation of acoustic and optical images of the same portion of a specimen are shown. |
| Starting Page | 779 |
| Ending Page | 783 |
| File Size | 392359 |
| Page Count | 5 |
| File Format | |
| DOI | 10.1109/ULTSYM.1988.49484 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1988-10-02 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Lenses Optical refraction Optical variables control Optical beams Optical microscopy Acoustic beams Optical design Piezoelectric films Acoustic transducers Piezoelectric transducers |
| Content Type | Text |
| Resource Type | Article |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| Sl. | Authority | Responsibilities | Communication Details |
|---|---|---|---|
| 1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
| 2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
| 3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
| 4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
| 5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
| 6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
| 7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
| 8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
| 9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
|
Loading...
|