Results 201 to 210 of about 325,753 (218)
Some of the next articles are maybe not open access.
A Tip-Tilt-Piston Micromirror Array for Optical Phased Array Applications
Journal of Microelectromechanical Systems, 2010A tip-tilt-piston micromirror array based on electrothermal bimorph actuation is presented. The micromirror uses a compactly folded actuator design that can realize high fill-factor with a simple fabrication process. A 4 × 4 micromirror array with sub-apertures of 0.9 mm and a fill-factor of 54% is demonstrated.
Edward A. Watson +4 more
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MEMS tip/tilt and piston mirror arrays as diffractive optical elements
SPIE Proceedings, 2005We present an analytic evaluation of the optical performance of a tip/tilt and piston Spatial Light Modulator, for use in adaptive optic and beam steering applications. The impact of array fill factor, pixel curvature, position and tilt accuracy, and pixel yield are discussed in detail.
Clinton Randy Giles +2 more
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Two Dimensional MEMS Piston Array for DUV Optical Pattern Generation
IEEE/LEOS International Conference on Optical MEMS and Their Applications Conference, 2006., 2006We describe the design, fabrication and dynamics of a two dimensional array of MEMS piston mirrors that fulfil the requirements needed to modulate deep ultraviolet radiation for mask pattern ...
F.P. Klemens +15 more
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Applied Optics, 2020
Piston diagnosing approaches for segmented mirrors via machine-learning have shown great success. However, they are inevitably challenged with 2π ambiguity, and the accuracy is usually influenced by the location and number of submirrors.
Mei Hui +6 more
semanticscholar +1 more source
Piston diagnosing approaches for segmented mirrors via machine-learning have shown great success. However, they are inevitably challenged with 2π ambiguity, and the accuracy is usually influenced by the location and number of submirrors.
Mei Hui +6 more
semanticscholar +1 more source
Adaptive optics correction of scintillation in underwater medium
, 2020Adaptive optics correction of the scintillation index of a Gaussian laser beam in underwater turbulence is studied. To introduce the adaptive optics correction, filter functions providing the piston, tilt and astigmatism effects are adapted to promote ...
Y. Baykal
semanticscholar +1 more source
The Journal of the Acoustical Society of America, 2000
The transfer function of a fiber-optic hydrophone (FOH) is computed for various fiber core radii. The hydrophone is modeled as a rigid disk, with plane waves impinging at normal or oblique incidence. The total sound field is written as the sum of the incident field and the field diffracted from the hydrophone.
Hans-Georg Trier +5 more
openaire +3 more sources
The transfer function of a fiber-optic hydrophone (FOH) is computed for various fiber core radii. The hydrophone is modeled as a rigid disk, with plane waves impinging at normal or oblique incidence. The total sound field is written as the sum of the incident field and the field diffracted from the hydrophone.
Hans-Georg Trier +5 more
openaire +3 more sources
Thermal piston model for the optoacoustic effect: Sound generation in an optically thick gas
Applied Physics Letters, 1987At high concentrations of an infrared absorbing gas, the optical absorption length for the incident radiation can become small compared with the thermal diffusion length in the gas. A description of the optoacoustic effect consequently must include thermal conduction of heat to the cell window since sound generation takes place in a thin layer of gas ...
R. B. Stewart, Gerald J. Diebold
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Simultaneous piston and tip-tilt measurement of segmented optics with cross-fringe phasing sensor
, 2023 Seichi Sato, Tadahito Mizutani
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Measurement, 2003
In this paper we describe the methodology and results of an experiment to measure the fundamental undamped natural frequency and damping ratio for the discharge reed valve in a rolling piston rotary compressor. The small size and extreme flexibility of the valve assembly required the use of a non-contacting measurement technique; thus, an optical ...
Glen Prater, William P. Hnat
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In this paper we describe the methodology and results of an experiment to measure the fundamental undamped natural frequency and damping ratio for the discharge reed valve in a rolling piston rotary compressor. The small size and extreme flexibility of the valve assembly required the use of a non-contacting measurement technique; thus, an optical ...
Glen Prater, William P. Hnat
openaire +2 more sources
Demonstration of a Semipermeable Optical Piston
Physical Review Letters, 1984H. G. C. Werij +3 more
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