High sensitivity pulsed laser vibrometer for surface vibration monitoring

2006 ◽  
Author(s):  
Ponciano Rodriguez ◽  
Sudhir Trivedi ◽  
Feng Jin ◽  
Jose Lorenzo ◽  
Chen-Chia Wang ◽  
...  
Keyword(s):  
Pulsed Laser ◽  
High Sensitivity ◽  
Vibration Monitoring ◽  
Laser Vibrometer ◽  
Surface Vibration

Human Life Signs Detection Using High-Sensitivity Pulsed Laser Vibrometer

2007 ◽  
Vol 7 (9) ◽  
pp. 1370-1376 ◽  
Author(s):  
Chen-Chia Wang ◽  
Sudhir B. Trivedi ◽  
Feng Jin ◽  
Serguei Stepanov ◽  
Zhongyang Chen ◽  
...  
Keyword(s):  
Human Life ◽  
Pulsed Laser ◽  
High Sensitivity ◽  
Laser Vibrometer

High sensitivity pulsed laser vibrometer and its application as a laser microphone

2009 ◽  
Vol 94 (5) ◽  
pp. 051112 ◽  
Author(s):  
Chen-Chia Wang ◽  
Sudhir Trivedi ◽  
Feng Jin ◽  
V. Swaminathan ◽  
Ponciano Rodriguez ◽  
...  
Keyword(s):  
Pulsed Laser ◽  
High Sensitivity ◽  
Laser Vibrometer

Biological Life Signs Detection Using High Sensitivity Pulsed Laser Vibrometer

2007 ◽  
Author(s):  
Chen-Chia Wang ◽  
Sudhir Trivedi ◽  
Feng Jin ◽  
Zhongyang Chen ◽  
Jacob Khurgin ◽  
...  
Keyword(s):  
Pulsed Laser ◽  
High Sensitivity ◽  
Laser Vibrometer

scholarly journals A new kind of laser microphone using high sensitivity pulsed laser vibrometer

2008 ◽  
Author(s):  
Chen-Chia Wang ◽  
Sudhir Trivedi ◽  
Feng Jin ◽  
V. Swaminathan ◽  
Narasimha S. Prasad
Keyword(s):  
Pulsed Laser ◽  
High Sensitivity ◽  
Laser Vibrometer

Pulsed-laser vibrometer using photoelectromotive-force sensors

2003 ◽  
Vol 83 (9) ◽  
pp. 1893-1895 ◽  
Author(s):  
Ponciano Rodriguez ◽  
Sudhir Trivedi ◽  
Feng Jin ◽  
Chen-Chia Wang ◽  
Serguei Stepanov ◽  
...  
Keyword(s):  
Pulsed Laser ◽  
Force Sensors ◽  
Laser Vibrometer ◽  
Photoelectromotive Force

Ca2RuO4Thin Film Growth by Pulsed Laser Deposition

2004 ◽  
Vol 819 ◽  
Author(s):  
Xu Wang ◽  
Yan Xin ◽  
Hanoh Lee ◽  
Patricia A. Stampe ◽  
Robin J. Kennedy ◽  
...  
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Electrical Transport ◽  
Film Growth ◽  
Pulsed Laser ◽  
High Sensitivity ◽  
Laser Deposition ◽  
Chemical Doping ◽  
Bulk Single Crystal ◽  
Electrical Transport Properties

AbstractBulk Ca2RuO4 is an antiferromagnetic Mott insulator with the metal-insulator transition above room temperature, and the Neel temperature at 113 K. There is strong coupling between crystal structures and magnetic, electronic phase transitions in this system. It exhibits high sensitivity to chemical doping and pressure that makes it very interesting material to study. We have epitaxially grown Ca2RuO4 thin films on LaAlO3 substrates by pulsed laser deposition technique. Growth conditions such as substrate temperature and O2 pressure were systematically varied in order to achieve high quality single-phase film. Crystalline quality and orientation of these films were characterized by X-ray diffractometry. Microstructure of the thin films was examined by transmission electron microscopy. The electrical transport properties were also measured and compared with bulk single crystal.

Laser Vibrometry Measurements of Rotating Blade Vibrations

1995 ◽  
Vol 117 (3) ◽  
pp. 484-488 ◽  
Author(s):  
A. K. Reinhardt ◽  
J. R. Kadambi ◽  
R. D. Quinn
Keyword(s):  
Steam Turbine ◽  
Gas Turbine ◽  
Reference Beam ◽  
Vibration Monitoring ◽  
Laser Vibrometer ◽  
Blade Vibration ◽  
Helicopter Blades ◽  
Blade Vibrations ◽  
Steam Turbine Blade ◽  
Electrodynamic Shaker

One of the most important design factors in modern turbomachinery is the vibration of turbomachinery blading. There is a need for developing an in-service, noncontacting, noninterfering method for the measurement and monitoring of gas turbine, jet engine, and steam turbine blade vibrations and stresses. Such a technique would also be useful for monitoring rotating helicopter blades. In the power generation industry, blade failures can result in millions of dollars of downtime. The measurement of blade vibrations and dynamic stresses is an important guide for preventive maintenance, which can be a major contributor to the availability of steam turbine, gas turbine, and helicopter operations. An experiment is designed to verify the feasibility of such a vibration monitoring system using the reference beam on-axis laser-Doppler technique. The experimental setup consists of two flat, cantilever blades mounted on a hub attached to the shaft of a dc motor. The motor rests on a linear bearing permitting motion only in the direction of the motor shaft. The motor and blade assembly is then excited via an electrodynamic shaker at the first natural frequency of the blades. The resulting blade vibration is then detected using a laser vibrometer. The vibration frequencies and amplitudes of the two rotating blades are successfully measured.

scholarly journals Flexible and Highly Sensitive Strain Sensor Based on Laser-Induced Graphene Pattern Fabricated by 355 nm Pulsed Laser

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4867 ◽  
Author(s):  
Sung-Yeob Jeong ◽  
Yong-Won MA ◽  
Jun-Uk Lee ◽  
Gyeong-Ju Je ◽  
Bo-sung Shin
Keyword(s):  
Focal Length ◽  
Pulsed Laser ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Gauge Factor ◽  
Functional Evaluation ◽  
Mechanical Fracture ◽  
Highly Sensitive ◽  
Human Finger ◽  
Small Deformations

A laser-induced-graphene (LIG) pattern fabricated using a 355 nm pulsed laser was applied to a strain sensor. Structural analysis and functional evaluation of the LIG strain sensor were performed by Raman spectroscopy, scanning electron microscopy (SEM) imaging, and electrical–mechanical coupled testing. The electrical characteristics of the sensor with respect to laser fluence and focal length were evaluated. The sensor responded sensitively to small deformations, had a high gauge factor of ~160, and underwent mechanical fracture at 30% tensile strain. In addition, we have applied the LIG sensor, which has high sensitivity, a simple manufacturing process, and good durability, to human finger motion monitoring.

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