Cost-effective optical switch matrix for microwave phased array

1991 ◽  
Author(s):  
Jing-Jong Pan ◽  
Seung L. Chau ◽  
Wei-Zhong Li ◽  
Charles H. Grove
Keyword(s):  
Phased Array ◽  
Optical Switch ◽  
Cost Effective

THEORETICAL ANALYSES FOR LASER MACHINING MICROCHANNELS AND DEMONSTRATION OF THEIR USES IN MANUFACTURE OF A MICROFLUIDIC OPTICAL SWITCH

2006 ◽  
Vol 13 (06) ◽  
pp. 795-802 ◽  
Author(s):  
DANIEL LIM ◽  
ERNA GONDO SANTOSO ◽  
KIM MING TEH ◽  
STEPHEN WAN ◽  
H. Y. ZHENG
Keyword(s):  
Fluid Flow ◽  
Optical Switch ◽  
Low Cost ◽  
Microfluidic Devices ◽  
Cost Effective ◽  
Laser Machining ◽  
Machining Parameters ◽  
Flow Channels ◽  
Cost Effective Method ◽  
Theoretical Analyses

Silicon has been widely used to fabricate microfluidic devices due to the dominance of silicon microfabrication technologies available. In this paper, theoretical analyses are carried out to suggest suitable laser machining parameters to achieve required channel geometries. Based on the analyses, a low-power CO 2 laser was employed to create microchannels in Acrylic substrate for the use of manufacturing an optical bubble switch. The developed equations are found useful for selecting appropriate machining parameters. The ability to use a low-cost CO 2 laser to fabricate microchannels provides an alternative and cost-effective method for prototyping fluid flow channels, chambers and cavities in microfluidic lab chips.

Ultrasound and Nonlinear Resonant Testing of Nuclear Reactor Internals Bolts

2011 ◽  
Author(s):  
S. W. Glass ◽  
B. Thigpen ◽  
J. Renshaw
Keyword(s):  
Phased Array ◽  
Nuclear Reactor ◽  
Structural Integrity ◽  
Cost Effective ◽  
Life Extension ◽  
Safe Operation ◽  
Plant Life ◽  
Nuclear Plants ◽  
Bolt Failure ◽  
Reactor Internals

As many nuclear plants approach the end of their initial 40 year license period, inspection or replacement of their reactor internals bolts must be considered. This is consistent with the Materials Reliability Program (MRP 227/228) guideline for plant life extension [1,2]. Assurance of the internals structural integrity is essential for continued safe operation of these plants. If there is no suspicion or indication of bolt failure, simple inspection is normally more cost-effective than replacement. Inspection vendors have inspected thousands of internals bolts with conventional and Phased Array UT but different head configurations and bolt capture mechanisms mandate specific qualifications for each bolt type. In some cases, complex bolt and head geometries coupled with counter-bore and locking bar interferences render classical UT inspections difficult or impossible. A range of solutions to inspect reactor internals including these difficult-to-inspect-by-conventional-UT baffle bolts has been developed by several vendors [3]. This presentation references developments to make bolt inspection a relatively quick and easy task through adaptations to the SUSI submarine inspection platform, the extensive UT qualification work suitable for conventional UT plus more recent advanced nonlinear resonant techniques to distinguish between flawed or loose, vs. acceptable bolts where conventional UT cannot be applied. Initial evaluations show that these advanced techniques may have the ability to reliably detect smaller flaws than previously possible with conventional techniques as well as provide information on bolt tightness.

scholarly journals Construction of a Cost-Effective Phased Array Through High-Efficiency Transmissive Programable Metasurface

2020 ◽  
Vol 8 ◽  
Author(s):  
Anjie Cao ◽  
Zhansheng Chen ◽  
Kai Fan ◽  
Yuehui You ◽  
Chong He
Keyword(s):  
Phased Array ◽  
High Efficiency ◽  
Cost Effective

Cost Effective Integration for Millimeter Wave Phased Array Apertures

2009 ◽  
Author(s):  
Marc Sherwin ◽  
Robert Howell ◽  
Christopher Kirby ◽  
Jeffrey Hartman ◽  
Eric Zirofsky
Keyword(s):  
Millimeter Wave ◽  
Phased Array ◽  
Cost Effective ◽  
Effective Integration

scholarly journals On the Alternate Transmission Mode for Polarimetric Phased Array Weather Radar

2015 ◽  
Vol 32 (2) ◽  
pp. 220-233 ◽  
Author(s):  
Valery M. Melnikov ◽  
Dušan S. Zrnić
Keyword(s):  
Phased Array ◽  
Cost Effective ◽  
Transmission Mode ◽  
Standard Errors ◽  
Pulse Switching ◽  
Ground Clutter ◽  
Polarized Waves ◽  
Repetition Time ◽  
Cost Effective Alternative ◽  
Long Pulse

AbstractPulse-to-pulse switching of polarizations (alternate transmission mode) is considered for polarimetric phased array radar (PAR). It is argued that the performance of the radar in terms of data quality should match or exceed the achieved standards of the Weather Surveillance Radar-1988 Doppler (WSR-88D). It turns out that the most stringent demand on the radar concerns the surveillance scan at the lowest elevations wherein the polarimetric variables are free of overlaid echoes, while ground clutter is significantly reduced. The scan uses a long pulse repetition time that has repercussion on the standard errors of the polarimetric variables and hence the choice of polarimetric mode. Herein the dwell time of this scan serves as a benchmark for comparisons of the accuracy of estimates. Because weather PAR should provide useful information at low signal-to-noise ratios (SNR) as low as those measured by the WSR-88D, the statistics of polarimetric variables, known at high SNR, is extended to low SNRs. It follows that the alternate mode would not match the performance of the simultaneous mode in the surveillance scans on the WSR-88D. Quasi-simultaneous transmission and reception of horizontally polarized and vertically polarized waves is discussed as a cost-effective alternative.

Characterization of a 2×2 optical switch using an acousto-optic cell with phased array transducers

2003 ◽  
Author(s):  
Yves Mevel ◽  
Veronique Quintard ◽  
Andre Perennou ◽  
Hongwu Li ◽  
Jean Le Bihan
Keyword(s):  
Phased Array ◽  
Optical Switch

Cost-effective method of manufacturing a 3D MEMS optical switch

2009 ◽  
Author(s):  
Emily Carr ◽  
Ping Zhang ◽  
Doug Keebaugh ◽  
Kelvin Chau
Keyword(s):  
Optical Switch ◽  
Cost Effective ◽  
Cost Effective Method
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