Bandwidth is an important parameter of FSM systems; in this case, the unit hertz (Hz) refers to the highest vibration frequency that the system can compensate for. In orbiting applications, gimbals can achieve bandwidths up to 10 Hz. Typical fine-steering mirrors provide bandwidths up to 1,000 Hz, but LHDC has extended that range to 2.8 kHz.

Another key parameter is acceleration, which permits the FSM to compensate for high-amplitude vibrations. LHDC has achieved accelerations greater than 10,000 radians/second², more than 10 times higher than typical competing FSMs. In developing its FSM products, LHDC must address the conflicting goals of fine-positioning precision, high acceleration, and high bandwidth while maintaining mirror flatness. Extending the bandwidth (while respecting customer’s cost constraints) presents an enormous technical challenge, requiring expertise in motion-control electronics, mechanical design, sensors, and materials and process (M&P) science.

Where it Stands

The company offers two product lines: High- Performance for space and other demanding applications, and Cost-Effective for applications in which cost is more critical than low mass. As of late 2006, LHDC had delivered more than 80 of these systems. These products may be configured for the application.

More Information

For more information on LHDC’s mirror-steering system, click here. (Source: MDA TechUpdate, Missile Defense Agency, National Technology Transfer Center Washington Operations.)