Form 9.B Project Summary

Chron:

971588

Proposal Number:

06.01-7833a

Project Title:

Fiber Bragg Grating Sensors for

Simultaneous Measurement of Shear

Force, Strain, and Temperature for

Aerospace Applications

Technical Abstract (Limit 200 words)

SEACOM proposes to develop new fiber Bragg

grating (FBG) sensors for wind tunnel

instrumentation to measure shear force, strain, and

temperature simultaneously. Innovations include:

· a pair of cross-tilted FBG's subjected to shear

force producing Bragg wavelength shifts in opposite

directions while producing strain and thermally

induced shifts in the same direction. A differential

measurement of Bragg shifts gives a measure of

the shear force independent of strain and

temperature. Currently such an instrument is not

commercially available;

· a dual wavelength method using co-written Bragg

gratings to measure strain and temperature

simultaneously during structural deformation of

wind tunnel models.

The Phase I research objective is to verify the

proposed concepts by conducting experiments on

FBG's subjected to fluid flow, mechanical strain and

thermal stress. In the Phase II research, sensors

will be developed that are capable of distributed or

multi-point measurement to provide more data per

tunnel-occupancy-hour. The all-optical nature of

FBG sensors makes them suitable for remote

operation and for measurement in a severe

environment of electromagnetic interference or

vibration. The proposed FBG sensors will be useful

to NASA for both cryogenic and high temperature

testing of wind tunnel models.

Potential Commercial Applications (Limit 200 words)

Commercial Applications:

- Remote and distributed flow measurement in an

explosive environment such as oil and gas pipes

- Water flow measurement in hydroelectric power

generation

- Industrial processes requiring flow and

temperature measurements

- Shear force measurements in the design of

hydrofoils

- Health monitoring of structures such as bridges

and buildings

Name and Address of Principal Investigator (Name,

Organization Name, Mail Address, City/State/Zip)

Jianli Zheng

Science & Engineering Applications Company

(SEACOM)

4317 Country Club Circle

Virginia Beach , VA 23455

Name and Address of Offeror (Firm Name, Mail Address,

City/State/Zip)

Arnel C. Lavarias

Science & Engineering Applications Company

(SEACOM)

4317 Country Club Circle

Virginia Beach , VA 23455