A Non-Contact Displacement Sensor for Estimating Sound Pressure Level in Pipes

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00014-10-M-0351
Agency Tracking Number: N10A-016-0185
Amount: $69,889.00
Phase: Phase I
Program: STTR
Awards Year: 2010
Solicitation Year: 2010
Solicitation Topic Code: N10A-T016
Solicitation Number: 2010.A
Small Business Information
Creare Inc.
P.O. Box 71, Hanover, NH, 03755
DUNS: 072021041
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Jed Wilbur
 Principal Investigator
 (603) 643-3800
 jcw@creare.com
Business Contact
 James Barry
Title: President
Phone: (603) 643-3800
Email: contractsmgr@creare.com
Research Institution
 Boston University
 Ronald A Roy
 110 Cummington Street
Room 420
Boston, MA, 2215
 (617) 353-4846
 Nonprofit college or university
Abstract
The presence of noise in piping systems often serves as an early warning of mechanical problems such as faulty or cavitating pumps and valves, or boiling in cooling lines. Additionally, in many Naval environments, especially submarines, minimizing noise radiated from vibrating pipes is highly desirable. The ability to quantify the sound pressure level in fluid-filled pipes with an external sensor is needed. Creare proposes to develop an easy-to-use, modular optical displacement sensor to estimate the sound pressure level inside a pipe by monitoring the outer wall vibrations. The sensor will be sensitive to sound pressure levels between 100 and 120 dB relative to 1 micro-Pascal at all frequencies between 10 and 3,000 Hz. In Phase I we will optimize our existing models of sound propagation in fluid-filled pipes and optical displacement sensors for pipes and fluids of interest to the Navy, perform a simple benchtop experiment to demonstrate the feasibility of our approach, and use the results of the models and experiments to refine our estimate of system sensitivity. By the completion of Phase II we will have developed a fully fieldable sensor system consisting of one universal control module and at least two pipe interface modules of different sizes.

* information listed above is at the time of submission.

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