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An opto-piezoelectric laminate composed of a photosensitive electrode and a PZT (Lead Zirconate Titan ate) layer modulated by a light field was adopted as the research platform of this paper. The photosensitive electrode is a thin film formed by mixing TiOPc (Titanium oxide phthalocyanine) and a copolymer. During operation, the instant variation of TiOPc impedance when illuminated with light beam...
Electrically tunable adaptive lenses provide several advantages over traditional lens assemblies in terms of compactness, speed and efficiency. Such a lens is a broadband device with its performance independent of light polarization. Here we developed a process for making liquid lens with tunable focal distance on applying electrical input. Materials used to make the lens were polydimethylsiloxane...
This presentation reports recent advancement of cellulose nanocrystals and cellulose nanofibers, followed by their possibilities as well as challenges for smart optics materials. Natural behaviors, extraction, modification of cellulose nanocrystals and fibers are explained and their synthesis with nanomaterials is introduced, which is necessary to meet the technological requirements for smart optics...
The unit removal function (URF) of special tools and tool paths are required for the modern sub-aperture deterministic polishing technologies. Paths may affect the amount of removed material because of the curvatures and corners existing on them. This study proposes a mathematic model along path for analyzing the effects of curvatures and corners on material removal during polishing. A numerical method...
Bending sensors are prospering in various fields because of their ability to sense the structural shape and deformation. Optical fiber can perform as bending sensor utilizing fiber gratings. Fiber gratings are categorized into two main types depending on the period of grating: FBGs which contain a sub-micron period length and LPFGs which typically own a period of 100-1000μm. LPFG-based...
As the rapid progress in the development of optoelectronic components and computational power, 3D optical metrology becomes more and more popular in manufacturing and quality control due to its flexibility and high speed. However, most of the optical metrology methods are limited to external surface. This paper proposed a new approach to measure tiny internal 3D surfaces with a scanning fiber endoscope...
Range scans of occupied building interiors will often generate a cumulative point cloud with disconnected regions due to varying data density and the presence of numerous partially occluded objects. Boundary detection methods based on surface normal vectors and curvature have difficulty in accurately representing occluded region boundaries because of the geometric uncertainty associated with the underlying...
Terahertz (THz) non-destructive evaluation (NDE) has shown great promise for applications in manufacturing, security screening, and medical imaging. However, interpretation of the THz A-scans is complicated by a number of factors. Other researchers have applied signal processing techniques that improve object boundary detection, but still rely on human interpretation without a statistical framework...
A focal tracking system is a tracing system that tracks a special marker called a focal marker. The cameras of a focal tracking system obtain images including bokeh which is shown from the a focal marker. Finding accurate center of bokeh is important for high precision position tracking of a focal marker. However, a focal tracking system suffers from vignetting effect which makes it difficult to find...
During steel-coil shipping, the coil-lifting operation is usually conducted manually by tying a sling belt through the bore hole of the coil, and then the crane moves the coil from the pallet to the ship. To fully automate this process, the key issues are an automated coil lifting mechanism imitating the manual operation and the reliable and accurate recognition methods for coils on a pallet and hold...
Experimental results obtained by applying both technique, Electronic Speckle Pattern Interferometry (ESPI) and Electronic Speckle Pattern Shearing Interferometry (ESPSI) were compared in the study of composite materials. We found that the difference between the strain fields obtained by ESPSI and ESPI was roughly a constant. This result was expected since, although ESPI in turn allows computing absolute...
A new lead-zirconium-titan ate (PZT) actuated scanning light source design is proposed. An Aerosol deposition process will be used to construct a high quality 5 μm thick film of PZT. The PZT actuator will induce non-linear vibrations to scan an area with a cantilever waveguide. The fabrication procedure for the design is presented. Fabrication results are discussed. A finite element...
An optical fiber switch based on a digital actuator with four discrete positions is presented and characterized in this paper. These discrete positions are obtained through a magnetic holding of a Mobile Permanent Magnet (MPM) placed in a fixed square cavity. The MPM can switch between four discrete positions that correspond to the four corners of the square cavity. This digital actuator is used as...
Our lab is developing miniature Raman imaging systems and topical-staining protocols to rapidly image cell-surface biomarkers in fresh tissues. In particular, this work employs targeted surface-enhanced Raman scattering (SERS) nanoparticles (NPs) to enable the sensitive and multiplexed detection of a large number of cell-surface biomarkers of cancer. The SERS NPs were functionalized with different...
This paper presents the design of a mesoscale robot for laser phonosurgery. The proposed design is situated between conventional mechanism and MEMS technology. A combination of compliant structures and innovative micro motors enables to achieve two decoupled tilting angle, a high range (up to 45°) and a precise positioning of a laser beam. The design methodology and the optimization of the compliant...
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 proof of concept a very fast adaptive glass membrane lens with a large aperture/diameter ratio, spherical aberration correction and integrated actuation. The membrane is directly deformed using two piezo actuators that can tune the focal length and the conical parameter. This operating principle allows for a usable aperture of the whole membrane diameter. Together with...
In this paper, figures of merit describing the performances of infrared (IR) bolometer sensor such as thermal response time (τ), responsivity, detectivity (D), noise equivalent power (NEP) and noise equivalent temperature difference (NETD) are estimated using numerical simulations. The proposed model is based on the analytical formulas from Frank Niklaus, et.al. Using this model, we...
Absorbers not only enhance efficiency of current sustainable energy technologies but also can be an additional sustainable energy source. In this paper, the features of several energy absorbers are compared, including absorptance spectrum, Q-factor, power loss density distribution and radiation pattern. With sufficient knowledge of energy absorbers, we can continue to the development of unique sustainable...
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