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Corona graphic space telescopes require wave front control systems for high-contrast imaging applications such as exoplanet direct imaging. High-actuator-count MEMS deformable mirrors (DM) are a key element of these wave front control systems, yet they have not been flown in space long enough to characterize their on-orbit performance. The MEMS Deformable Mirror Cube Sat Test bed is a conceptual nanosatellite...
In this paper, we present the on-going study to explore the use of photoplethysmograph (PPG), and inertial measurement unit (IMU) sensors to sense the movement of the fingers and the orientation of the hand. This paper focuses on an optical sensor system that can detect the movement of the fingers by utilizing the photoplethysmograph (PPG). The optical sensor consists of the light emitting and detecting...
A novel in-plane and out-of-plane deformation simultaneous measurement method using only two speckle patterns grabbed before and after deformation of an object with rough surfaces is proposed. An optical system is set up by improving ordinary two-beam speckle interferometer. In the new optical system, because a phenomenon of in-plane and out-of-plane deformation can be simultaneously recorded by only...
We demonstrated three-dimensional (3D) position measurements of a gold nanoparticle held in optical tweezers in water. The position measurements were performed with an in-line, low-coherence digital holographic microscope with the twilight-field technique. The position of the optically-trapped nanoparticle with a diameter of 60 nm had an axial variation of 7.6 nm in the standard deviation when a 1070...
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