Phase Conjugate Micromotion Detection-Based Interferometric Vibrometer

The U.S. Air Force is seeking a laser vibrometry system for monitoring the health of our satellites, and monitoring and recognizing foreign satellites. To address the Air Force need for a high-resolution, long-distance vibrometer, Physical Optics Corporation (POC) proposes to develop a new Phase Conjugate Micromotion Detection (PCMD)-based Interferometric Vibrometer (PIV). The PIV consists of a laser to illuminate the target, a telescope to receive reflected light from the target, and a PCMD interferometer to measure vibrations. The return signal is Doppler-shifted due to satellite motion. This shift is amplified using PCMD technology, which reduces the required reflected signal by a factor of >1000. The PIV will measure vibrations with amplitudes as small as 5 nm and vibration velocities as low as 20 nm/s, exhibiting a sensitivity of a factor of 500 more than current systems, at a distance of >2000 km, which is an improvement of a factor of 8 over the state of the art. In Phase I POC will demonstrate the feasibility of PIV through computer modeling and testing of a proof-of-principle prototype. In Phase II POC will develop an engineering prototype to measure vibration through testing at Air Force test sites.