Zobrazeno 1 - 10
of 84
pro vyhledávání: '"H.E. Engan"'
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 56:2711-2721
Capacitive micromachined ultrasonic transducers (CMUTs) with 5.7 ?m radius, realized by wafer bonding, have been characterized by both optical and electrical measurements. These measurements are performed by our heterodyne interferometer and a networ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::39f1ca2cc597a99f764ef87b9b2b9465
https://doi.org/10.1109/tuffc.2009.1362
https://doi.org/10.1109/tuffc.2009.1362
Autor:
Magnus W. Haakestad, H.E. Engan
Publikováno v:
Journal of Lightwave Technology. 24:838-845
The acoustic and acoustooptic properties of a weakly multimode solid core photonic crystal fiber (PCF) are studied. The phase velocity of the lowest order flexural acoustic mode is measured as a function of frequency and compared with the results for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a39233767f03a45252abb8b2dfd471d4
https://doi.org/10.1109/jlt.2005.862431
https://doi.org/10.1109/jlt.2005.862431
Autor:
H.E. Engan
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 46:1035-1041
Previously (Engan 1998) we have studied the scattering of torsional waves in circular rods with a free surface where the rod diameter is subject to abrupt diameter changes. Here, we discuss the scattering of torsional waves from tapered regions and,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1d8735fc34c07976c3c8a0379db7febf
https://doi.org/10.1109/58.775671
https://doi.org/10.1109/58.775671
Autor:
H.E. Engan
Publikováno v:
The Journal of the Acoustical Society of America. 104:2015-2024
The propagation and scattering of torsional waves in circular rods of infinite length with a free surface that have an abrupt diameter change is discussed. A mode expansion technique involving propagating and cut-off modes is applied to obtain numeri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::48219877426f328e838bfeed7652792a
https://doi.org/10.1121/1.423716
https://doi.org/10.1121/1.423716
Autor:
H.E. Engan, Dan Östling
Publikováno v:
Optical Fiber Technology. 3:177-183
We demonstrate an acousto-optic tunable filter based on a two-mode elliptical-core fiber. The filter is operated at 1090 nm as a broadband notch filter used for spectral flattening and as a bandpass filter with subnanometer bandwidth. When used for s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::78049ee42312a32ba4978ecd715b27c4
https://doi.org/10.1006/ofte.1997.0211
https://doi.org/10.1006/ofte.1997.0211
Autor:
Dan Östling, H.E. Engan
Publikováno v:
Journal of Lightwave Technology. 15:312-320
We propose and demonstrate a mode coupler which converts either of the LP/sub 01/ polarization states in a two-mode high-birefringence (Hi-Bi) fiber to the LP/sub 11/ mode with the same polarization. We use coupled-mode theory to develop design rules
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1c0ec493b07f8c249438cb7f5c08c644
https://doi.org/10.1109/50.554383
https://doi.org/10.1109/50.554383
Publikováno v:
19900-19921
Optics Express
Optics Express
A heterodyne interferometer for highly sensitive vibration measurements in the range 100kHz − 1.3GHz is presented. The interferometer measures absolute amplitude and phase. The signal processing of the setup is analyzed and described in detail to o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d3486655ceb6c76720e9fd649ccc614a
https://hdl.handle.net/11250/2561295
https://hdl.handle.net/11250/2561295
Publikováno v:
SPIE Proceedings.
The lack of commercial equipment for characterization of vibrating micro- and nanostructures has motivated the development of a heterodyne interferometer. The setup is designed to measure phase and absolute amplitude in the entire frequency range 0-1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5666c976ae24fbbea60b1549f68ec579
https://doi.org/10.1117/12.795061
https://doi.org/10.1117/12.795061
Autor:
H.E. Engan, Johannes Skaar
Publikováno v:
Optics letters. 24(3)
It is shown that a recently proposed phase-retrieval technique for Bragg gratings [Opt.??Lett.??22, 93 (1997); J.??Lightwave Technol.?? 15, 1314 (1997)] is not well suited for gratings with imperfections. The reconstructed group delay is in many case
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::47710d5559d9f3f1d9e478b594b4d580
https://pubmed.ncbi.nlm.nih.gov/18071432
https://pubmed.ncbi.nlm.nih.gov/18071432
Publikováno v:
Optics Express
A heterodyne interferometer has been built in order to characterize vibrations on micro- and nanostructures. The interferometer offers the possibility of both absolute phase and high resolution absolute amplitude vibrational measurements. By using tw
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c740382f5f257245e33a14f8c18e4da4
http://hdl.handle.net/11250/2392737
http://hdl.handle.net/11250/2392737