Advanced Imaging

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Advanced Imaging Magazine

Updated: January 12th, 2011 09:49 AM CDT

Illumination

LEDs shed new light on machine vision applications
TECHSPEC Telecentric Backlight Illuminator from Edmund Optics
Opto Diode’s new High-Output Red LEDs
Prizmatix Modular Microscope-LED Light Source products series
New compact LED driver modules from ERG
New range of LED-based edge-lit illumination solutions from Global Lighting Technologies
SuperLED CCTV Infrared Illuminators from Bosch
High-flux, warm white LED prototype from OSRAM
New “Thin Type” Machine Vision LED Dome Lights at LDDLIGHT.com
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By Kari O'Rourke

One of the most critical components in any vision system design is the lighting. By selecting the proper light source, development and reliability is dramatically improved for your application.

Because light-emitting diodes (LEDs) are inexpensive, energy-efficient and have long life spans (approximately 100,000 hours), they are the primary source for machine vision illumination. Also, LEDs can be manufactured in almost any shape or size, so they offer greater flexibility to the system integrator.

The LED technology can be found in an array of lighting products—ring lights, backlights, dome lights, spotlights and illuminators.

Edmund Optics’ (Barrington, N.J.) Telecentric Backlight Illuminator combines the advantages of backlighting an object with the benefits of a telecentric lens design. The TECHSPEC Telecentric Backlight Illuminator uses optics to direct light from a fiber optic light guide or LED onto an object, producing a high contrast silhouette. The illuminator increases edge contrast and measurement accuracy with any imaging lens used in gauging applications by decreasing diffuse reflections from an object under backlight conditions that increase edge softening. The Telecentric Backlight Illuminator is based on the same design principles as telecentric measuring lenses, which improve gauging accuracy by eliminating parallax errors. This device also substantially increases illumination compared to a standard backlight, which produces faster measurements than typical fiber optic or LED backlights. The adjustable aperture allows variable output without varying color temperature. Compatible with 1/4-inch fiber optic light guides or 0.312-inch LEDs. www.edmundoptics.com

Opto Diode Corp. (Newbury Park, Calif.) announces the new OD-624L high-output rRed LED. The high output light-emitting diode series has a dominant emission wavelength at 624 nm (typical) and features a narrow beam angle that is ideal for fluorescence in medical, scientific testing instruments, and forensic applications. The new lighting device delivers total power output ranging from 80 mW (minimum) to 170 mW (typical). Under test conditions of lF = 350 mA, the peak emission wavelength is typically 635 nm and the spectral bandwidth at 50 percent is 40 nm. Opto Diode offers the high-output red LED in a hermetically-sealed TO-5 can with three leads. Under absolute maximum ratings at 25 º C, the continuous forward current is 500 mA, with reverse voltage of 10V. The lead soldering temperature (1/16-inch from the case for 10 seconds) is 260 ° C, making this LED easy and convenient to install into new and/or existing lighting systems. Thermal parameters for storage and operating temperatures range from -55 ° C to 100 ° C, with the maximum junction temperature at 115 ° C. www.optodiode.com

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