Two mode fibers for self-referencing force sensors and mode filtering

The advent of microprocessor controlled engines in automobiles has prompted an increase in sensor research. Optical sensors are being considered because of the immunity to EMI and the potential for interfacing to optical buses for future auto networks. A formidable problem is the measurement of cylinder pressure to gain information regarding the current state of an engine. With the pressure pulse data, a feedback control can be used to optimize engine performance. The peak combustion pressure location versus crank angle allows optimization for reduced emissions and better fuel economy. Effectively, with this system operational, the automobile is self tuning in real time.

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