Optical inertial reference unit for kilohertz bandwidth...

Details Optical inertial reference unit for kilohertz bandwidth... Optical inertial reference unit for kilohertz bandwidth...

2007-06-05

2007-06-05

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S203100

Reexamination Certificate

active

11020189

ABSTRACT:
A device providing an inertially stabilized laser beam as an optical reference. The device consists of a base and a small stabilized optical platform that emits the laser beam. The platform connects to the base through a mechanical flexure that allows relative motion in two axes. High-bandwidth angular rate sensors affixed to the platform measure platform motion in inertial space. Linear displacement sensors measure relative motion between base and platform. A closed-loop control system accepts these sensor measurements and command actuators that null the sensed platform motions, maintaining the optical platform fixed in inertial space. The digital controller implements a Sensor Blending Kalman Filter that blends high frequency signals from the platform with low frequency signals from a DC sensor (gyroscope) external to this device but affixed to the common base. The controller enables both stabilization of the laser beam and commanded pointing of the beam in inertial space.

REFERENCES:
patent: 4315610 (1982-02-01), Malueg
patent: 5067351 (1991-11-01), Laughlin
patent: 5469053 (1995-11-01), Laughlin
patent: 6700109 (2004-03-01), Eckelkamp-Baker et al.
patent: 2002/0145102 (2002-10-01), Eckelkamp-Baker et al.
patent: 2005/0161578 (2005-07-01), Eckelkamp-Baker et al.

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