Novel Design Concept for Single-Mode Polymer Waveguides

1995 ◽  
Author(s):  
Goetz Fischbeck ◽  
Klaus Petermann
Keyword(s):  
Single Mode ◽  
Design Concept ◽  
Polymer Waveguides ◽  
Novel Design

scholarly journals Scalable Output Linear Actuators, a Novel Design Concept Using Shape Memory Alloy Wires Driven by Fluid Temperature

Machines ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 14
Author(s):  
Andres Osorio Salazar ◽  
Yusuke Sugahara ◽  
Daisuke Matsuura ◽  
Yukio Takeda
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Angular Position ◽  
Scale Factor ◽  
Design Concept ◽  
Fluid Temperature ◽  
Step Size ◽  
Simple Method ◽  
Output Characteristics ◽  
Novel Design

In this paper, the concept of scalability for actuators is introduced and explored, which is the capability to freely change the output characteristics on demand: displacement and force for a linear actuator, angular position and torque for a rotational actuator. This change can either be used to obtain power improvement (with a constant scale factor), or to improve the usability of a robotic system according to variable conditions (with a variable scale factor). Some advantages of a scalable design include the ability to adapt to changing environments, variable resolution of step size, ability to produce designs that are adequate for restricted spaces or that require strict energy efficiency, and intrinsically safe systems. Current approaches for scalability in actuators have shortcomings: the method to achieve scalability is complex, so obtaining a variable scaling factor is challenging, or they cannot scale both output characteristics simultaneously. Shape Memory Alloy (SMA) wire-based actuators can overcome these limitations, because its two output characteristics, displacement and force, are physically independent from each other. In this paper we present a novel design concept for linear scalable actuators that overcome SMA design and scalability limitations by using a variable number of SMA wires mechanically in parallel, immersed in a liquid that transmits heat from a separate heat source (wet activation). In this concept, more wires increase the maximum attainable force, and longer wires increase the maximum displacement. Prototypes with different number of SMA wires were constructed and tested in isometric experiments to determine force vs. temperature behavior and time response. The heat-transmitting liquid was either static or flowing using pumps. Scalability was achieved with a simple method in all tested prototypes with a linear correlation of maximum force to number of SMA wires. Flowing heat transmission achieved higher actuation bandwidth.

scholarly journals Bragg Grating Sensors in Laser-written Single Mode Polymer Waveguides

2015 ◽  
Vol 120 ◽  
pp. 878-881 ◽  
Author(s):  
J. Missinne ◽  
A. Vasiliev ◽  
A. Elmogi ◽  
N. Teigell Beneitez ◽  
E. Bosman ◽  
...  
Keyword(s):  
Single Mode ◽  
Bragg Grating ◽  
Polymer Waveguides

scholarly journals SHORT TERM INTRAVASCULAR VENTRICULAR ASSIST DEVICE - A NOVEL DESIGN CONCEPT

ASAIO Journal ◽  
2005 ◽  
Vol 51 (2) ◽  
pp. 33A
Author(s):  
Ramamoorthy Ramaswamy ◽  
Krishnamoorthy Ramaswamy ◽  
Ramaswamy Ganapathy
Keyword(s):  
Ventricular Assist Device ◽  
Design Concept ◽  
Short Term ◽  
Assist Device ◽  
Ventricular Assist ◽  
Novel Design

Fabrication of Mach-Zehnder Polymer Waveguides by a Direct-Drawing Technique Using a Focused Proton Beam

2013 ◽  
Vol 534 ◽  
pp. 158-161 ◽  
Author(s):  
Kenta Miura ◽  
Takahiro Satoh ◽  
Yasuyuki Ishii ◽  
Hiromu Kiryu ◽  
Yusuke Ozawa ◽  
...  
Keyword(s):  
Proton Beam ◽  
Single Mode ◽  
Next Generation ◽  
Polymer Waveguides ◽  
Proton Beam Writing ◽  
Straight Line ◽  
Drawing Technique ◽  
Microfabrication Technology

Proton beam writing (PBW) has recently attracted much attention as a next-generation microfabrication technology. This is a direct-drawing technique and does not need any masks to transfer micropatterns to sample surfaces. In our previous work, we demonstrated the first single-mode straight-line and Y-junction PMMA-based waveguides fabricated using PBW and working at λ = 1.55 μm. In this work, we fabricated the first PMMA-based Mach-Zehnder waveguides for the wavelength utilizing PBW in order to construct thermo-optic switches.

A Two Degree of Freedom Nanopositioner With Electrothermal Actuator for Decoupled Motion

2011 ◽  
Author(s):  
Yong-Sik Kim ◽  
Nicholas G. Dagalakis ◽  
Satyandra K. Gupta
Keyword(s):  
Design Concept ◽  
Degree Of Freedom ◽  
Motion Platform ◽  
Element Analysis ◽  
Electrothermal Actuators ◽  
Electrothermal Actuator ◽  
Decoupled Motion ◽  
Moving Platform ◽  
Two Degree Of Freedom ◽  
Novel Design

Building a two degree-of-freedom (2 DOF) MEMS nanopositioner with decoupled X-Y motion has been a challenge in nanopositioner design. In this paper a novel design concept on making the decoupled motion of the MEMS nanopositioner is suggested. The suggested nanopositioner has two electrothermal actuators and employs a fully nested motion platform with suspended anchors. The suggested MEMS nanopositioner is capable of delivering displacement from the electrothermal actuator to the motion platform without coupled motion between the two X-Y axes. The design concept, finite element analysis (FEA) results, fabrication procedures and the performance of the 2 DOF nanopositioner is presented. In order to test the nanopositioner moving platform decoupled motion, one actuator moves the platform by 60 μm, while the other actuator is kept at the same position. The platform position cross talk error was measured to be less than 1 μm standard deviation.

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