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Bossa Nova Technologies is pleased to introduce QUARTET, a cost-effective interferometer based on multi-channel random quadrature detection technology.

QUARTET is designed for remote detection of sub-nanometer displacements (Patent # 2005/062941 A2). No path stabilization is required. The stability of the interferometer is based on the multi-channel, parallel demodulation that is done electronically. Quadrature interferometers have been used for more than 20 years for detection of small surface motions. The performance of these interferometers was initially limited by the quality of electronic components that were available (limited bandwidth & dynamic). With the recent improvement of electronic components, quadrature interferometers have now reached maturity, exhibiting high-bandwidth and high sensitivity. QUARTET uses an innovative "random quadrature" demodulation scheme that takes advantage of the random phase distribution inherent to speckle light. High sensitivity is achieved through multi-channel detection and parallel processing. The detectors produce a time-varying analog voltage that is proportional to the rectified instantaneous surface displacement at ultrasonic frequencies. Bossa Nova Technologies proprietary multi-detection system increases the effective collection efficiency (increase of sensitivity & reduction of signal dropout caused by speckles) without reducing the depth-of-field.

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