Advanced Imaging


Advanced Imaging Magazine

Updated: January 12th, 2011 10:01 AM CDT

Core Technology: Let There be Light

Lighting achievements abound in previously hard to illuminate areas
The Rapp OptoElectronic JML-C2 Flash Unit from ASI.
The Rapp OptoElectronic JML-C2 Flash Unit from ASI.
precisExcite® LED excitation system from CoolLED
precisExcite® LED excitation system from CoolLED
Edmund Optics ChamelEOS™
Edmund Optics ChamelEOS™ is a user-friendly LED-based fiber optic illumination source for industrial and R&D applications.
GLT’s MicroLens™
GLT’s MicroLens™ molded light guides enable outstanding edge-lit backlighting performance.
auto-calibrating system
This auto-calibrating system from Illumination Technology ensures that all CMOS/CCD sensor calibration stations worldwide are operating to the same exact standard.
New lighting technologies from Lumitex
New technologies from Lumitex enable designers to backlight or illuminate areas that have previously been problematic or unreachable.
Mercron lighting supplies
Mercron supplies over 100 different models, so that custom lighting can be applied to virtually any machine vision application.
Osram Opto Semiconductors
Osram Opto Semiconductors breaks 1000 lumen barrier with new Ostar LED.
Precision-aligned Xenon light
Precision-aligned Xenon light source provides plug & play convenience from Pacer.
The new ACULED VHL is offered standard in monochromatic (ABOVE) as well as multi-color chips including an RGBY version from PerkinElmer (BELOW).
RGBY version from PerkinElmer
Spectrum Illumination lighting controller
Spectrum Illumination has developed a lighting controller, the Monster Brain.
high-brightness front and back light LED illuminators
COBRA products are high-brightness front and back light LED illuminators for linescan and web inspection applications from Stocker Yale
V Cubed smart design
V Cubed smart design concept products now available from STEMMER IMAGING.
The Power Lightline
The Power Lightline (PLL) is an LED based scalable illumination solution for the web inspection industry from Volpi.
the new SPOT LED 003 from Waldmann Lighting
Waldmann Lighting introduced the new SPOT LED 003, the next generation of functional LED lighting for the machining centers and work areas of today.

By Stacey Meacham

With advances in machine vision, commercial applications and the world of microscopy, illumination needs have changed. Manufacturers have responded by offering illumination solutions for diverse applications as well as support products to achieve superior results.

The Rapp OptoElectronic JML-C2 Flash Unit from ASI / Applied Scientific Instrumentation (Eugene, Ore.) is a pulsed Xenon light source producing an intense flash of UV light for the photolysis of caged compounds in the specimen plane of a microscope. The single case configuration permits easy operation, easy alignment by the user, and easy lamp replacement. The unit offers a high efficiency flash bulb with up to 220 J/pulse, UV anti-reflection coated quartz optics, and a 0.2 - 8 Hz repetition rate. The unit includes a 1.5-meter quartz light guide, a built-in UV filter, and slots for optical filters, as well as an LED illumination tool for specimen alignment and a calibrated photodiode for lamp adjustment. The system can be triggered externally or manually at the front panel. The Rapp JML-C2 is a powerful tool for use in science and industry in initiating photochemical reactions or for illumination. www.ASI

Despite their inherent advantages over traditional mercury-based light sources, until now LEDs have not been bright enough to be used as the light source of fluorescence microscopes. Now, because of the development of new LED array technology, the CoolLED (Andover, Hampshire, UK) PrecisExcite is the first commercially viable unit of its kind and is designed to work with all types of fluorescence microscopes.LEDs have many advantages over conventional light sources. They produce an immediate and consistent light source over a narrow bandwidth, the brightness can be easily controlled, no warm-up period is required, they are significantly more efficient, need no maintenance and use no consumables. In addition, they avoid the health and environmental hazards associated with mercury lamps and, as they operate from a low voltage supply, are inherently safe.Cost of ownership is very low compared with mercury lamps. The PrecisExcite has a “light-on” lifetime of more than 10,000 hours whereas mercury lamps have a comparatively short life that is further reduced each time it is switched on and off. In addition, the microscope may have to be recalibrated after the bulb has been changed, adding to the operating cost.The PrecisExcite produces three separate selectable wavelengths that match the most commonly used fluorescence dyes and a great advantage to the microscopist is that the wavelength is highly repeatable, does not change with ageing and has a fast switching rate and so helps to avoid photo bleaching.Mercury lamps produce a wide spectrum of light, requiring a filter system to block out unwanted light and isolate the required wavelength. Because of the narrow bandwidth of the LED source there is no need for filters, which inevitably let through some unwanted light, thus improving performance in terms of signal to noise ratio.

Edmund Optics (Barrington, N.J.) ChamelEOS™ is a user-friendly LED-based fiber optic illumination source for industrial and R&D applications. Based on EO’s EOS™ technology, ChamelEOS™ offers all the benefits of LED illumination, including independently controllable red, green, and blue color channels, strobing and overdriving functionality, and cold illumination, coupling the energy into an optical fiber for delivery to the illumination site.

ChamelEOS™ offers the user dynamic light management. All channels can be operated independently or simultaneously, and the source can be run continuously or strobed. In its analog input mode, voltages presented at three input channels directly control the illumination level for each LED, generating a full range of color values and intensity levels. A triggering option allows users to generate light pulses from each channel by applying a trigger pulse to the input channels. A trigger delay of 100µs to 50ms, pulse duration of 100µs to 50ms, and peak current for each channel is independently user settable.

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