We are developing projector system with scanning fiber device and its control system. Our novel scanning systems of scanning fiber device provide high resolution, uniform brightness, rectangular display area, which are difficult matters of conventional scanning fiber device. And we have confirmed that scanning fiber device is applicable to some application products such as head mounted display.
We propose an optical fiber scanner suitable for high-power industrial laser marking systems. The proposed optical scanner enables beam scanning by resonating the optical fiber end with an electric actuator. As our optical scanner is extremely compact and lightweight, high-speed operation can be expected compared with the conventional galvanometer-type optical scanner. In this paper, novel monitoring and compensation techniques of the beam scanning path utilizing a position-sensitive detector in order to compensate for the manufacturing errors of optical fiber scanners are discussed. We demonstrate that the beam can be scanned linearly at a resonance frequency of about 10 kHz by appropriately controlling the amplitude and phase difference of the applied voltage.
Forward-looking photoacoustic imaging (PAI), with the potential to capture three-dimensional (3D) images of tissue structures and distinguish their characteristics, is desired in order to perform more efficient catheter interventions for complicated diseases, such as chronic total occlusion. However, few studies have reported forward-looking 3D PAI. In this study, we experimentally demonstrated the forward-looking 3D PAI in vitro with our optical-resolution PAI system.
To construct a 3D image, an optical-resolution PAI with a piezoelectric fiber actuator is used. The actuator is attached to the fiber and oscillates it to spirally control the direction of a laser. For each laser emission, a photoacoustic signal that is generated at each laser line (or volume) is received by a capacitive micromachined ultrasound transducer (CMUT). As the laser directions and ultrasound time of flight are known, the positions of the laser-induced ultrasound sources are determined and therefore, the 3D image can be constructed.
In our in vitro experiments, a laser pulse was emitted from multi-mode fiber illuminated carbon rod samples with diameters of 0.5 mm. The rod samples formed grid structures with a spacing of 1.0 mm. The distance between the CMUT receiver and the samples was about 10 mm. The structures in the resultant images, created with a rendering technique, were visualized with a signal-to-noise ratio of over 10. In the presentation, detailed results taken by the forward-looking 3D PAI system will be described.
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