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Technologies for Precise Distance and Angular Measurements In Space

Technology and Flight Hardware Development of Optical Metrology. Components and subsystems for precise distance measurements, applicable to SIM, and future relativity missions.Moderate power lasers with long lifetimes.Metrology source (freq shifters etc.)Beam launchers (metrology gauges)Types of

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Technologies for Precise Distance and Angular Measurements In Space

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    1. Technologies for Precise Distance and Angular Measurements In Space M. Shao JPL

    2. Technology and Flight Hardware Development of Optical Metrology Components and subsystems for precise distance measurements, applicable to SIM, and future relativity missions. Moderate power lasers with long lifetimes. Metrology source (freq shifters etc.) Beam launchers (metrology gauges) Types of errors at the picometer level Angular measurements at the microarcsec level, the SIM technology program. End to end demonstration of micro-arcsec astrometric precision Astrometry as a tool to study dark matter in our galaxy, and the local group.

    3. Metrology Source Two major components Laser Frequency shifters and fiber distribution systems Laser SIM’s laser is a NPRO diode pumped YAG laser, designed with redundant pump laser diodes to achieve > 99.7% probability of working for 5 years in space. (SIM has a spare laser, ) The acousto-optic frequency shifters provide the optical signals needed for heterodyne interferometry. The major activity here is not developing new technology but engineering components for flight.

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