A bi-material microbeam based thermal actuator for out-of-plane rotation

2014 ◽  
Author(s):  
Ali Najafi Sohi ◽  
Patricia M. Nieva
Keyword(s):  
Thermal Actuator ◽  
Plane Rotation ◽  
Out Of Plane

Wavelet-modified maximum average correlation height filter for out-of-plane rotation invariance

Optik ◽  
2009 ◽  
Vol 120 (2) ◽  
pp. 62-67 ◽  
Author(s):  
Shilpi Goyal ◽  
Naveen K. Nishchal ◽  
Vinod K. Beri ◽  
Arun K. Gupta
Keyword(s):  
Rotation Invariance ◽  
Plane Rotation ◽  
Average Correlation ◽  
Out Of Plane

Surface Micromachined Polysilicon Components Containing Continuous Hinges and Microrivets Used to Realize Three-Dimensional MEMS Structures

2001 ◽  
Vol 687 ◽  
Author(s):  
Edward S. Kolesar ◽  
Matthew D. Ruff ◽  
William E. Odom ◽  
Simon Y. Ko ◽  
Jeffery T. Howard ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Single Layer ◽  
Dimensional Structure ◽  
Plane Rotation ◽  
Arrow Head ◽  
Three Dimensional Structure ◽  
Out Of Plane ◽  
Open Window ◽  
Pass Through ◽  
Glass Reinforcement

AbstractA new polysilicon surface micromachining technique for fabricating and assembling three- dimensional structures has been developed. Single-layer polysilicon elements and laminated polysilicon panels incorporating trapped-glass reinforcement ribs have been successfully fabri- cated on a silicon substrate with robust and continuous hinges that facilitate out-of-plane rotation and assembly. To realize a stable three-dimensional structure, one of the device's elevatable panel components is terminated with an array of open windows, and the mating rotatable element has a matched set of protruding arrowheads/microrivets with flexible barbs that readily flex to facilitate their joining and assembly. Because the arrowhead/microrivet barb tip-to-barb tip sepa- ration is larger than the opening in the mating window, the barbs flex inward as they pass through the open window and then expand to their original shape upon exiting the window, re- sulting in a permanently latched joint and a three-dimensional structure. Three novel arrow- head/microrivet designs have been micromachined to facilitate the latching process, including a simple arrowhead, a high-aspect ratio arrowhead, and a rivet-like structure with a hemispherical shaped cap and a flexible split shank.

A reliable single-layer out-of-plane micromachined thermal actuator

2003 ◽  
Vol 103 (1-2) ◽  
pp. 48-58 ◽  
Author(s):  
Wen-Chih Chen ◽  
Chien-Cheng Chu ◽  
Jerwei Hsieh ◽  
Weileun Fang
Keyword(s):  
Single Layer ◽  
Thermal Actuator ◽  
Out Of Plane

scholarly journals Pose Invariant Palm Vein Identification System using Convolutional Neural Network

2018 ◽  
Vol 15 (4) ◽  
pp. 502-509 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Neural Network ◽  
Convolutional Neural Network ◽  
Data Augmentation ◽  
Region Of Interest ◽  
Input Image ◽  
Identification System ◽  
Plane Rotation ◽  
Imaging Device ◽  
Out Of Plane ◽  
Palm Vein

Palm vein recognition is a one of the most efficient biometric technologies, each individual can be identified through its veins unique characteristics, palm vein acquisition techniques is either contact based or contactless based, as the individual's hand contact or not the peg of the palm imaging device, the needs a contactless palm vein system in modern applications rise tow problems, the pose variations (rotation, scaling and translation transformations) since the imaging device cannot aligned correctly with the surface of the palm, and a delay of matching process especially for large systems, trying to solve these problems. This paper proposed a pose invariant identification system for contactless palm vein which include three main steps, at first data augmentation is done by making multiple copies of the input image then perform out-of-plane rotation on them around all the X,Y and Z axes. Then a new fast extract Region of Interest (ROI) algorithm is proposed for cropping palm region. Finally, features are extracted and classified by specific structure of Convolutional Neural Network (CNN). The system is tested on two public multispectral palm vein databases (PolyU and CASIA); furthermore, synthetic datasets are derived from these mentioned databases, to simulate the hand out-of-plane rotation in random angels within range from -20° to +20° degrees. To study several situations of pose invariant, twelve experiments are performed on all datasets, highest accuracy achieved is 99.73% ∓ 0.27 on PolyU datasets and 98 % ∓ 1 on CASIA datasets, with very fast identification process, about 0.01 second for identifying an individual, which proves system efficiency in contactless palm vein problems.

A Micro Helico-Kinematic Platform via Spherical Crank Sliders

2004 ◽  
Author(s):  
Craig P. Lusk ◽  
Larry L. Howell
Keyword(s):  
Virtual Work ◽  
Full Range ◽  
Vertical Motion ◽  
Helical Motion ◽  
Plane Rotation ◽  
Stick Slip ◽  
Optical Components ◽  
Analysis Techniques ◽  
Out Of Plane ◽  
Design Freedom

A novel surface micromachined mechanism, the Micro Helico-Kinematic Platform (MHKP), is presented. The MHKP achieves a combination of vertical out-of-plane translation and in-plane rotation (helical motion) of a platform with an in-plane rotational input. The motion achieved requires specialized analysis techniques in spherical kinematics and introduces the micro spherical crank-slider. Spherical kinematic concepts are reviewed to aid in describing the motion and conveying the scope of the device’s design freedom. The force and displacement relations for the mechanism are derived using virtual work techniques. A surface micromachined prototype was fabricated and tested. Testing indicates that the sliding interface between the spherical crank sliders and the platform results in some stick-slip friction and that the mechanism is able to achieve its full range of motion. The vertical motion of the platform can be advantageous in micro manipulation applications such as the positioning of micro-optical components.

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