Project Title:

Embedded Fiber Optic Sensors for Polymer-Matrix Composite Process Monitoring

04.01-7070
Embedded Fiber Optic Sensors for Polymer-Matrix 	Composite Process Monitoring
Geo-Centers, Inc.
7 Wells Avenue
Newton Centre, MA 02159
Ian Aeby  (617-964-7070)
LeRC -- NAS3-25337

Abstract:

	 At present, confidence levels in the integrity of polymer-matrix, composite structures
are low due to uncertainties in process control during their manufacture. Control
of chemical changes during fabrication will require improved process parameter sensors
and control methodologies. The use of fiber optic sensors embedded within the composite
structure during fabrication was proposed as a means toward this end. Embedded sensors
offer improved data accuracy over remote sensors, and the small physical dimensions
of optical fibers minimize their impact on the mechanical properties of the finished
composite. 
	During the Phase I feasibility study, it was established that embedded fiber optic
sensors could be used to monitor critical composite process parameters such as temperature
and state of cure. Examples of these sensors were successfully embedded in various
composite layups. In addition, an interesting new referencing technique for intensity-modulated
sensors was discovered. While progress has been made in monitoring polymeric-matrix
composite fabrication processes, there is clearly much work to be done before the
value of an embedded fiber optic sensor system has been proven in a manufacturing
environment.

Potential Commercial Application:

Potential Commercial Application: Embedded fiber-optic pressure and temperature sensors
have applications in the commercial composite industry and, potentially, in medicine
for diagnostic instrumentation. Other possible uses are in environmental control
and monitoring performance of automobile engines.