Results 241 to 250 of about 1,221,918 (286)

Error propagation in curvature sensors

SPIE Proceedings, 2010
The effect of measurement noise on the phase reconstruction is here analyzed for curvature sensors. It is shown, that for a fixed extra-focal distance the phase variance depends only on the number of photons and is independent of the number of sensing elements. The error propagation factor is further computed for three different sampling geometries:
Aglaé Kellerer, Mark Chun, Christ Ftaclas   +2 more
openaire   +1 more source

The UH wavefront curvature sensor.

Adaptive Optics for Large Telescopes, 1992
Wavefront sensors currently used in adaptive optics operate only on relatively bright sources. One of the most sensitive sensor ever built is the Hartmann sensor of the European COME-ON adaptive optics system developed for infra-red astronomy [1]. It is equipped with an electron-bombarded CCD and can stabilize images on a 3.6 m telescope with a mag 13 ...
F. Roddier, J.E. Graves, D.L. McKenna, M.J. Northcott   +3 more
openaire   +1 more source

Differential Shack-Hartmann curvature sensor: local principal curvature measurements

Journal of the Optical Society of America A, 2008
The concept of a differential Shack-Hartmann (DSH) curvature sensor was recently proposed, which yields wavefront curvatures by measuring wavefront slope differentials. As an important feature of the DSH curvature sensor, the wavefront twist curvature terms can be efficiently obtained from slope differential measurements, thus providing a means to ...
Zou, Weiyao, Thompson, Kevin P., Rolland, Jannick P.   +2 more
openaire   +3 more sources

Using a cylindrical tactile sensor for determining curvature

IEEE Transactions on Robotics and Automation, 1991
It is shown how contact curvature can be determined from a single contact with a cylindrical tactile sensor. When the tactile finger touches an unknown smooth convex surface, contact location, principal curvatures, and normal force are determined from a 4*4 window of strain measurements.
Ronald S. Fearing, Thomas O. Binford
openaire   +2 more sources

Magnetoelastic skin curvature sensor for biomedical applications

Proceedings of IEEE Sensors, 2004., 2006
The present paper concerns the versatile applicability of a novel skin curvature sensor family for multiparametric monitoring of physiological parameters. The basic element of the sensor is a magnetoelastic bilayer which shows a magnetoelastic amorphous layer and a nonmagnetic layer.
Kaniušas, Eugenijus, Pfützner, Helmut, Mehnen, Lars, Kosel, Jürgen, Varoneckas, Giedrius, Alonderis, Audrius, Meydan, Turgut, Vázquez, Manuel, Rohn, Michael, Merlo, Alberto Maria, Marquardt, Bernd   +10 more
openaire   +2 more sources

Soft curvature sensors for joint angle proprioception

2011 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2011
We introduce a curvature sensor composed of a thin, transparent elastomer film (polydimethylsiloxane, PDMS) embedded with a microchannel of conductive liquid (eutectic Gallium Indium, eGaIn) and a sensing element. Bending the sensor exerts pressure on the embedded microchannel via the sensing element.
Rebecca K. Kramer, Carmel Majidi, Ranjana Sahai, Robert J. Wood   +3 more
openaire   +1 more source

Single-mode fiber curvature sensor based on SPR

Applied Optics, 2022
A fiber surface plasmon resonance (SPR) sensor is widely used in high-sensitivity refractive index measurement, but there is less research on curvature measurement. In this paper, a single-mode fiber curvature sensor based on SPR is designed and fabricated. By employing bending, the transmitted light in the fiber core leaks into the
Yong, Wei, Chunbiao, Liu, Chunlan, Liu, Lingling, Li, Lei, Hu, Yonghui, Zhang, Xiaoling, Zhao, Tianci, Jiang, Rui, Wang, Chen, Shi   +9 more
openaire   +2 more sources

Soft actuators with screen-printed curvature sensors

2017 IEEE SENSORS, 2017
Castable elastomers have been used to fabricate soft fluidic actuators and the technique scales well from prototyping to mass manufacturing. However, similarly scalable techniques for integrating strain or curvature sensors into such devices are still lacking.
Anastasia Koivikko, Ehsan Sadeghian Raei, Veikko Sariola, Mahmoud Mosallaei, Matti Mäntysalo   +4 more
openaire   +1 more source

Hybrid curvature and gradient wave-front sensor

Optics Letters, 2000
A new wave-front sensor for adaptive optics that gives signals for the curvature and the two gradient components of the wave front simultaneously is proposed. The sensor uses quad cells placed at the foci of an array of astigmatic lenslets, giving three intensity-normalized differential signals.
C, Paterson, J C, Dainty
openaire   +2 more sources

Piezoelectric polymer curvature sensor for measurement of regional curvature radius of LV wall

American Journal of Physiology-Heart and Circulatory Physiology, 1988
To evaluate regional myocardial function, we developed a curvature sensor for direct and instantaneous measurement of the regional curvature radius of the LV wall. The sensor is a bimorph of two sheets of thin piezoelectric polymer film. The relation between output voltage of the sensor and the reciprocal of the known curvature radius has been shown ...
K, Tsujioka, Y, Ogasawara, K, Mito, O, Hiramatsu, Y, Wada, M, Goto, S, Matsuoka, M, Kagiyama, F, Kajiya   +8 more
openaire   +2 more sources