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Machine Vision Adapts to Harsh Environments
Exploding beer bottles, tsunamis and flour may not seem to have anything in common, but they are all hazards that machine vision systems can face in field applications. System designs targeting the controlled conditions of a lab expect an ideal working environment, not real-world problems. When a system must be deployed outside the laboratory, less than favorable conditions make the design challenge formidable. Fortunately, there are options for dealing with harsh environments. Unfavorable...
Photonics Spectra, January 2008
Matching Driver to LED
LED lighting offers many potential benefits over incandescent, halogen, fluorescent and gas/arc lamps, and lighting designers are eager to take advantage of those benefits. Although it is the market for retrofitting that is immense, it is the...
Photonics Spectra, January 2008
Method Developed to Track 3-D Motion of Fluorescent Particles
Accurately measuring single fluorescent particles is often a challenge because their Brownian motion makes it difficult to keep them in focus for prolonged periods. As a result, investigators are forced to gather data from many samples to...
Photonics Spectra, January 2008
Nanoscale Light Sources Could Benefit Near-Field Scanning Optical Microscopy
The probe tip traditionally used with near-field scanning optical microscopes comprises an optically pumped device that transmits light from a far-field source to the sample through either a hollow pyramid or an optical fiber, possibly leading to...
Photonics Spectra, January 2008
Polymer Could Lead to Improved LCDs
Researchers have shown recently that an external electric field can change the alignment of the polymer MEH-PPV in liquid crystals. This alignment can polarize the light emitted by the liquid crystals in a display, which increases the brightness and...
Photonics Spectra, January 2008
The Chip-on-Board LED Module
Cold-cathode fluorescent lamps still are the industry standard for backlighting color LCD monitors and TVs, even though red, green and blue (RGB) LEDs have been demonstrated to bring benefits. When LEDs are combined with a color-management feedback...
Photonics Spectra, January 2008
The Fuss About Quantum Dots
It is hard to think about a life without semiconductor technology: The entire global information and communications infrastructure is based on semiconductors, and in every one of these applications, size matters. To create computer chips that...
Photonics Spectra, January 2008
Will Changing Machine Vision Standards Cut Costs and Boost Performance?
Upcoming changes in the communications standards that drive machine vision could mean cheaper and more capable setups as well as a greater ability to mix and match hardware and software. Developments throughout the next year in the Camera Link and...
Photonics Spectra, January 2008
Artificial 3-D Quantum Dot Crystal Created
Although quantum dots are being looked at for a growing number of applications, the scale of the nanosize semiconductors continues to make it difficult to arrange them into the precision patterns necessary for applications such as optoelectronics,...
Photonics Spectra, December 2007
Closing in on Photonics Large-Scale Integration
The introduction of very large scale integration dramatically cut the cost of electronic devices, driving the development of a wide range of new products. Efforts to bring the benefits of large-scale integration to the photonics sector have proved...
Photonics Spectra, December 2007
Coal mine Safety
According to the latest official mining statistics, from 2003 to 2006, more than 20,000 people died from coal mining accidents in China. Death tolls are at levels of four persons per billion tons mined per year compared with the US level of 0.04. As...
Photonics Spectra, December 2007
Different Chemistry at an Icy Edge
Clearing up the atmospheric impact of salting roads and sidewalks is one possible outcome of recent research exploring the quasiliquid layer found at the interface between air and ice. Another possible outcome could be a better understanding of the...
Photonics Spectra, December 2007
Fiber Makes Inroads in Stress/Strain Measurement
Demand for increasingly sophisticated measurement tools is on the rise in oil and gas as well as in civil-structure industries, among others. Traditional test equipment has included strain gauges and load cells, but fiber optic technologies recently...
Photonics Spectra, December 2007
High-Brightness Multilayer Optical Film Light Source
Liquid crystal on silicon projection systems are used in rear- and front-projection television, and in head-mounted displays, and they have the potential to be used in nanoprojectors. They are built on silicon wafers with a reflective plane and,...
Photonics Spectra, December 2007
Metal-Coated Fibers
Glass optical fibers typically are manufactured with a polymer buffer or coating that protects the glass from scratches that would severely reduce the inherent strength of the fiber. Polymer coatings have been used for more than 25 years in the...
Photonics Spectra, December 2007
Multiphoton, Multifocal Fluorescence Lifetime Imaging
One multiphoton microscope is good, but more can be better, especially when it comes to speed. A team of researchers has combined multifocal, multiphoton excitation with time-correlated single-photon-counting detection to increase the image...
Photonics Spectra, December 2007
Opening Optical Fibers Without Sacrificing Robustness
Access to the core of an optical fiber is required for many applications, including evanescent wave sensing. Direct access to the core of conventional optical fibers has been achieved typically by removing the fiber cladding by etching or by...
Photonics Spectra, December 2007
Organic Thin-Film Solar Cell Research at Stanford University
Although extremely simple in concept, successful photovoltaic devices for solar energy production will require the optimization of many different parameters involving material electron donor properties, electrode configurations, substrate mechanics...
Photonics Spectra, December 2007
Rear-Projection Helps New Avionics Displays Fit into Old Cockpits
A plane’s cockpit is a tight space, full of displays that are rectangular, square, circular, trapezoidal or something else, all of which convey vital information to the pilot. Because most displays in use today are based on older technology,...
Photonics Spectra, December 2007
Silicon Nanowires Show Promise for Solar Applications
As the search continues for efficient and inexpensive materials to harvest solar energy, investigators at MIT in Cambridge have found that silicon nanowire arrays may offer some advantages over the more established thin-film...
Photonics Spectra, December 2007
Silicon Photomultiplier Detectors for Low-Light Detection
Low-light detectors and multidetector imagers enable a wide range of applications, including cell imaging, biodiagnostic instrumentation, semiconductor wafer inspection, particle counting, nuclear medicine, radiation detection and quantum...
Photonics Spectra, December 2007
The Common Thread
The telecommunications industry was the first market to use fiber optic components and devices in high volume. The expertise gained by bringing fiber optic components and devices to the performance and reliability levels needed now can be applied in...
Photonics Spectra, December 2007
The Illuminated Laser Warning Sign
The traffic light is a universally recognized device (except perhaps by the severely color-blind). Green means proceed through the intersection — it is safe; red means stop — danger; and yellow means (no, it doesn’t mean hurry up and beat the red)...
Photonics Spectra, December 2007
Uncovering the Best Way to Turn Dull Wood Pulp into Bright Paper
When making paper, manufacturers typically use hydrogen peroxide to bleach the processed wood pulp, thus brightening the final product. To avoid delignifying the pulp — reducing the pulp yield and destroying the fibers that provide strength — the...
Photonics Spectra, December 2007
Using Software to Validate Assumptions in Projector Design
Designers often are faced with the daunting task of translating vague requirements for a complex device into a set of design specifications for individual components. Then they must use those specifications to create a working design. Each decision...
Photonics Spectra, December 2007
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