Ever since the invention of laser by Schawlow and Townes in 1958, various innovative ideas of laser-based applications emerge very year. At the same time, scientists and engineers keep on improving laser's power density, size, and cost which patch up the gap between theories and implementations. More importantly, our everyday life is changed and influenced by lasers even though we may not be fully aware of its existence.
Laser scanning technology has emerged as a research field in the science and
engineering arena. Laser scanning performs a procedure to detect a surface using laser
technology. A scanning device analyzes a real-world object to retrieve data on its
shape and its appearance. The collected data can then be used to construct a digital
three-dimensional model. The aim of the scanning is usually to create a point cloud on
an object surface.
many new developments in infrared and Raman instrumentation, such as high
sensitive detectors, charge-coupled devices (CCD) and array detectors, laser
excitation sources, step-scan technique, photoacoustic detection, spectral depth
profiling, light-fiber optics, mapping and imaging in the field of microscopy,
time resolved and surface-enhanced methods - in order to mention a few of
these significant improvements. Of course this progress in vibrational spectroscopy
is closely connected with the enormous development in computer technique.
This book covers a wide range of topics relating to advanced industrial robotics, sensors and automation technologies. Although being highly technical and complex in nature, the papers presented in this book represent some of the latest cutting edge technologies and advancements in industrial robotics technology.
Các phương pháp kiểm tra không tiếp xúc kiểu quang học
• Có 3 loại:
– 1. Machine vision – 2. Thiết bị quét chùm tia laser (Scanning laser beam devices) – 3. Photogrammetry – Cả 3 đều dùng cảm biến quang học hay vật liệu cảm quang. Những hệ thống cảm biến quang học đơn giản dùng photocells, photodiodes, photographic paper.
In the eight years since publication of the first edition, enormous progress has been
made in the field of skin imaging and analysis. Because of the broad array of new
methods now available to the research scientist—and more and more to the clinically-
oriented dermatologist—we were able to widen the scope of this book from
the skin surface to the entire skin. This is also reflected in the change of the volume
title, Bioengineering of the Skin: Skin Imaging and Analysis.
Hence, this second edition is a major revision of the first edition, with more
than 30 new chapters added....
The aim of this study was to analyse the thickness of the retinal nerve fibre layer
(RNFL) of pulmonary tuberculosis patients on ethambutol and isoniazid. Materials and Methods:
This was a prospective cohort study where patients with newly diagnosed pulmonary
tuberculosis requiring chemotherapy, including ethambutol and isoniazid, were imaged using
scanning laser polarimetry. Their mean baseline RNFL thickness and various scanning laser
polarimetry parameters of both eyes were measured 2 weeks after the commencement of
The uptake by mammalian cells of phosphorothioate oli-gonucleotides was compared with that of their respective
complexes or conjugates with cationic, cell-penetrating
model peptides of varying helix-forming propensity and
amphipathicity. An HPLC-based protocol for the synthesis
and purification of disulfide bridged conjugates in the 10–
100 nmol range was developed. Confocal laser scanning
microscopy (CLSM) in combination with gel-capillary
electrophoresis and laser induced fluorescence detection
(GCE-LIF) revealed cytoplasmic and nuclear accumula-tion in all cases. ...
Alubaidy et al. Nanoscale Research Letters 2011, 6:375 http://www.nanoscalereslett.com/content/6/1/375
Synthesis of magnetic nanofibers using femtosecond laser material processing in air
Mohammed-Amin Alubaidy1, Krishnan Venkatakrishnan1* and Bo Tan2
Abstract In this study, we report formation of weblike fibrous nanostructure and nanoparticles of magnetic neodymiumiron-boron (NdFeB) via femtosecond laser radiation at MHz pulse repetition frequency in air at atmospheric pressure.
The stereolithographic (SL) process is performed on the equipment
shown in Figure 1. The movable platform on which the 3D model is
formed is initially immersed in a vat of liquid photopolymer resin to a
level just below its surface so that a thin layer of the resin covers it. The
SL equipment is located in a sealed chamber to prevent the escape of
fumes from the resin vat.
The resin changes from a liquid to a solid when exposed to the ultra-
violet (UV) light from a low-power, highly focused laser.
The goal of our research is to develop an autonomous robot for subsurface mapping. We are motivated by the growing need for mapping buried pipes, hazardous waste, landmines and other buried objects. Most of these are large scale mapping problems, and to manually construct subsurface maps in these cases would require a signiﬁcant amount of resources. Therefore, automating the subsurface mapping process is an important factor in alleviating these problems. To achieve our goal, we have developed a robotic system that can autonomously gather and process Ground Penetrating Radar (GPR) data.
Because the photopolymer used in the SL process tends to curl or sag
as it cures, models with overhangs or unsupported horizontal sections
must be reinforced with supporting structures: walls, gussets, or
columns. Without support, parts of the model can sag or break off before
the polymer has fully set. Provision for forming these supports is
included in the digitized fabrication data. Each scan of the laser forms
support layers where necessary while forming the layers of the model.