Compact Bidirectional Acoustic Airflow Meter for Aviation Applications (CBAAM)

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$75,000.00
Award Year:
2010
Program:
SBIR
Phase:
Phase I
Contract:
N68335-10-C-0325
Agency Tracking Number:
N101-016-1258
Solicitation Year:
n/a
Solicitation Topic Code:
NAVY 10-016
Solicitation Number:
n/a
Small Business Information
Comtech Communication
100 Hogan Point Rd, Hilton, NY, 14468
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
192352086
Principal Investigator:
Jeffrey Gutterman
Principal / Owner
(585) 392-8299
jsgy@yahoo.com
Business Contact:
Jeffrey Gutterman
Principal / Owner
(585) 392-8299
jsgy@yahoo.com
Research Institution:
n/a
Abstract
The Comtech Bidirectional Acoustic Air Meter uses tuned piezoelectric transducers to send pulse trains of approximately 250 cycles of ultrasonic (40-100 kHz, typ.) acoustic energy diagonally across the air stream. Every ~10 ms, the transducers change roles and send the same acoustic energy in the opposite direction, defined as "upstream" and "downstream". We precisely measure the phase shift between the sender and receiver in both directions. If there is no air flow, the upstream and downstream phase shifts are identical. If there is flow, the upstream phase shift will be slightly longer than the downstream and vice versa. Air velocity is determined using the difference between the two phase shifts. Air temperature is determined from the average of the two phase shifts. Air pressure information is measured independently with a pressure sensor as the speed of sound is virtually independent of ambient pressure. For a known cross sectional area, mass air flow is calculated every ~10 ms by combining the velocity, temperature and pressure information. High resolution is obtained by averaging the phase readings (~100) during each 10 ms reading cycle. Since acoustic energy is sent in both directions, reverse flows and temperatures can be measured with equal resolution.

* information listed above is at the time of submission.

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