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Light Sources Articles

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Scatter and BSDF Measurements: Theory and PracticeScatter and BSDF Measurements: Theory and Practice
Richard Pfisterer, Photon Engineering LLC
Except for direct illumination from the sun, laser, or other light source, everything we see or detect is ultimately scattered light. Light can be scattered or rescattered during its propagation to...
Tunable Light Sources: A Popular Choice for Measurement ApplicationsTunable Light Sources: A Popular Choice for Measurement Applications
Many common spectroscopic measurements require the coordinated operation of a detection instrument and light source, as well as data acquisition and processing. Integration of individual components...
Microscopy Illumination: Considering Nonlaser Light SourcesMicroscopy Illumination: Considering Nonlaser Light Sources
As recently as five years ago, shopping for a microscope light source was fairly straightforward. For routine applications, it was tungsten halogen, typically 100 W, while for fluorescence, it was an...
Aspheric Lenses: Design ConsiderationsAspheric Lenses: Design Considerations
Jeremy Govier, Edmund Optics Inc.
Aspheric surfaces are powerful tools that combine the optical corrections of multiple lenses into a single element (Figure 1) and affect performance in ways that spherical optics cannot. For example,...
Light-Emitting Diodes: A PrimerLight-Emitting Diodes: A Primer
Opto Diode Corporation, An ITW company
The wavelength range of commercially available LEDs with single-element output power of at least 5 mW is 275 to 950 nm. Each wavelength range is made from a specific semiconductor material family,...
Interferometry: Measuring with LightInterferometry: Measuring with Light
Zygo Corporation
An interferometer is an instrument that compares the position or surface structure of two objects. The basic two-beam division of amplitude interferometer components consists of a light source, a...
Integrating Spheres: Collecting and Uniformly Distributing LightIntegrating Spheres: Collecting and Uniformly Distributing Light
Greg McKee, Labsphere Inc.
An integrating sphere’s function is to spatially integrate radiant flux (light). However, before one can optimize a sphere design for a particular application, it is important to understand how...
Optical Delay Lines: Key to Time-Resolved MeasurementsOptical Delay Lines: Key to Time-Resolved Measurements
One of the most critical elements of any time-resolved spectroscopy and dynamics experiment is the optical delay line. A typical optical delay line consists of a retroreflector or folding mirrors on...
Standard CIE IlluminantsStandard CIE Illuminants
Colorimetry: How to Measure Color DifferencesColorimetry: How to Measure Color Differences
Konica Minolta Sensing Americas Inc.
The use and importance of colorimetry has grown in unison with the increase of global manufacturing and processing. When plastic automotive trim produced on one continent must match a painted metal...
Machine Vision Lighting: A First-Order ConsiderationMachine Vision Lighting: A First-Order Consideration
SCHOTT North America, Inc., Fiber Optics
In the beginning, automated inspection focused on the camera and optics, the algorithms, the interface hardware and the processor. Only rarely was attention paid to the lighting system or lighting...
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