Rotorcraft Airspeed Measurement System
To address the Navy"s need, Physical Optics Corporation (POC) has developed a new Rotorcraft Airspeed Measurement (RAM) system. This RAM system is based on self-mixing interference in a semiconductor laser diode. During Phase I, POC proved feasibility of the RAM system with a new velocity sensor system design, performance analysis, and assembly and testing of a RAM prototype that demonstrated wind speed measurements at a POC laboratory. This prototype has proven that RAM can measure wind speeds with greater than 2% accuracy and with a signal-to-noise ratio better than 10. The theoretical estimates have shown the optical Doppler signal is amplified by the cavity gain medium, enabling a much higher (~10^3) signal-to-noise ratio than traditional laser-based systems. Simulations for determining the optimal emitter size showed that an emitter radius larger than 2.5 cm is sufficient to achieve carrier-to-noise ratio of nearly 1000 at 15 m from the laser using 1550 nm laser wavelength. In Phase II, POC will develop a RAM prototype using a 1-W laser, enabling RAM to concurrently measure multidirectional low airspeed of rotorcraft. The resulting RAM will be ready for mass production and rapid transitioning to the Navy for deployment during AMCM missions.
Small Business Information at Submission:
Chief Financial Officer
Physical Optics Corporation
Photonic Systems Division 20600 Gramercy Place, Bldg. 100 Torrance, CA -
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