DIGITAL OPTICAL PHASE-LOCK-LOOP

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: 12117
Amount: $500,000.00
Phase: Phase II
Program: SBIR
Awards Year: 1991
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Systems & Processes Engineerin
1406 Smith Road Suite A, Austin, TX, 78721
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Gary B. Mcmillian
 V.p., Chief Scientist
 (512) 385-0082
Business Contact
 CLAYTON A. T. NYBERG
Title: EXECUTIVE VICE PRESIDENT
Phone: (512) 385-0318
Research Institution
N/A
Abstract
SYSTEMS & PROCESSES ENGINEERING CORPORATION (SPEC) HAS DEVELOPED AN INNOVATIVE DESIGN FOR A DIGITAL OPTICAL PHASE-LOCK-LOOP (DOPLL) FOR MEASUREMENT OF STRAIN, DISPLACEMENT, OR VIBRATION IN NONDESTRUCTIVE EVALUATION APPLICATIONS. THE TECHNIQUE OFFERS A NUMBER OF ADVANTAGES OVER PREVIOUS ANALOG PHASE-LOCK-LOOP DESIGNS. THE DIGITAL SYSTEM IS CAPABLE OF SEEKING MULTIPLE LOCK POINTS UNDER SOFTWARE CONTROL, SUCCESSIVELY REFINING THE MEASUREMENT PRECISION BY SEEKING LOCK POINTS AT HIGHER MODULATION FREQUENCIES. THE DIGITAL SYSTEM HAS A BROAD OPERATING BANDWIDTH, USING A DIGITAL FREQUENCY SYNTHESIZER IN PLACE OF A BANDWIDTH LIMITED VOLTAGE CONTROLLED OSCILLATOR. THE DIGITAL SYSTEM IS CAPABLE OF SIGNIFICANTLY FASTER OPERATION, SINCE THE PRECISE MODULATION FREQUENCY IS KNOWN AT PHASE LOCK AND NO PRECISION MEASUREMENT IS REQUIRED TO DETERMINE FREQUENCY. THE DESIGN IS RELATIVELY INSENSITIVE TO THE PATH OF THE INTENSITY MODULATED LIGHT, AND A COMMON DOPLL PATH LENGTH MEASUREMENT SYSTEM CAN BE UTILIZED WITH A NUMBER OF SENSOR TYPES, EACH CONNECTED VIA FIBER OPTICS.

* information listed above is at the time of submission.

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