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Sparrold S.,Edmund Optics Inc.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

Aspheric placement in the Double Gauss form is re-evaluated. Two aspheric configurations are considered and their resulting aberration balances are studied and compared to an all spherical design. © 2010 Copyright SPIE - The International Society for Optical Engineering.

Fales G.,Edmund Optics Inc.
Laser Focus World | Year: 2011

The choice of infrared (IR) optical material for an asphere determines how it can be fabricated. This determines which design options are available, such as the addition of diffractive surfaces for achromatization. Material choice is the first step in defining the manufacturing method used to produce the asphere. It is important to examine a few of the features that differentiate IR aspheres from their visible counterparts. Three common methods for asphere manufacturing are single-point diamond turning (SPDT), subaperture polishing, and precision molding. Single-point diamond turning is also a critical enabling technology for another IR aspheric manufacturing technique, known as precision molding. Subaperture polishing is the most suitable solution for the most complex geometries or for larger optics.

The latest advancements in photomultiplier tubes and detectors, along with improved filter contrast and transmission have allowed detection and analysis of spontaneous movements on the nanometer level using fluorescence correlation spectroscopy (FCS). The basic techniques of FCS are discussed along with several novel applications, such as nanoparticle dispersion studies. FCS is an extremely powerful, versatile technique that is useful in vivo and in vitro for biochemistry and biophysics. The use of FCS can determine and obtain a great deal of quantitative information, such as diffusion coefficients, hydrodynamic radii, kinetic chemical reaction rates, photophysical processes, and a wide variety of internal and external dynamic characteristics of biological molecules.

An enormous range of vision products is available today from an ever-growing base of manufacturers and an engineer must know how to integrate these. Simple objects can be illuminated by basic, cost-effective, directional lighting that is simply designed and easy to use and mount. If the engineer is looking to change the manufacturing process after a system is deployed, verify with the integrator that everything will work or have it update the system before running the new parts. By simply stepping up a level in camera resolution, engineers can increase the number of pixels being analyzed by a factor four and thus greatly leverage those powerful algorithms. The integrator, with the help of the camera or software provider, can provide the optimal camera to produce the best results. A few other parameters must be considered when choosing optics and tying the entire system together. These include field of view, working distance, depth of field, resolution and contrast.

Briggs S.,Edmund Optics Inc.
Biophotonics International | Year: 2013

Incorporation of high-quality optical filters will allow researchers to improve precision and accuracy for neuroscience. There are two filter schemes that can be implemented in determination of proteins. The first is a very small filter embedded to the fiber tip, and the second is a filtering system adjacent to the light source. In both situations, brief pulses of light are typically stronger and penetrate deeper into tissue, so it is critical to ensure the correct wavelength is radiated on the target. Extremely steep cut-on and cut-off bands of a filter are required, in addition to higher optical densities that will block the unwanted light from being exposed to the region of interest. Again, optical filters will play a major role in the tracking of these fluorescent molecules. These filters could be high-optical-density neutral-density filters to attenuate the signal, or they could be extremely narrow bandpass filters to absorb the undesirable light, as any reflected light would most likely result in additional, unwanted ionic activity.

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