Dynamic Strain and Crack Monitoring Sensor

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$69,960.00
Award Year:
2006
Program:
SBIR
Phase:
Phase I
Contract:
NND06AA30C
Agency Tracking Number:
054894
Solicitation Year:
2005
Solicitation Topic Code:
A2.09
Solicitation Number:
n/a
Small Business Information
Los Gatos Research
67 East Evelyn Avenue, Suite 3, Mountain View, CA, 94041-1518
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
928805761
Principal Investigator:
An-Dien Nguyen
Principal Investigator
(650) 965-3459
a.d.nguyen@lgrinc.com
Business Contact:
Anthony O'Keefe
president
(650) 965-7772
a.okeefe@lgrinc.com
Research Institution:
n/a
Abstract
The development of condition-based monitoring sensor network systems has the potential to provide an enhanced aircraft safety by real time assessment of the aircraft's structural integrity. Los Gatos Research proposes to develop a structural health monitoring sensor system, capable of simultaneously monitoring dynamic strain and structural damages in aircraft components in real time. Our novel sensor technology offers a number of advantages including compactness (0.2mm x 5mm x 5mm), lightweight (few grams), low cost, and fast response (milliseconds). We achieve this by fabricating Bragg gratings on stress-sensitive polymer planar waveguides on a flexible substrate, which is capable of measuring stress, strain, and temperature, and monitoring damages in advanced material structures. In Phase I, using a DFB laser with a feedback control we will demonstrate the sensor's capability to measure both static and dynamic strain with large dynamic range, high accuracy and high sensitivity. In addition, combing the low-cost laser-based demodulation technique and an acousto-ultrasonic method we will demonstrate the polymer gratings' capability to monitor ultrasonic stress waves indicating the presence and severity of damages in a metal structure, when the structure is probed by an ultrasonic wave generation actuator device.

* information listed above is at the time of submission.

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