SOUTHWEST RESEARCH INSTITUTE

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Our approach to designing optical sensing systems begins with analysis of the application and breadboard testing in the laboratory. We have equipped an optical laboratory with a wide assortment of optical benches, mounts, lenses, filters, light sources, sensors, and cameras so that alternative configurations can be quickly prototyped and evaluated.

Precision Non-Contact Measurement

Shaft Gauging System

Optical sensors are widely used for dimensional measurement and quality assurance (QA). One SwRI design uses several laser distance gauges to automatically measure the run-out of shafts as they are rotated on a fixture. This sensor replaced a manual system using visual reading of contact dial indicators. The success of this system required consistent optical signals and computer analysis of the data to provide results that correspond with accepted QA practice.

Image-Based Precision Measurement

Displacement Mapping

High-resolution video cameras can be used as optical sensors. The DisMap© system was designed for precision measurement of strain. Normalized image correlation is used to determine the displacements at grid points when a specimen is loaded. The resulting displacement map provides information of material deformation that would be impossible to obtain by any other method.
 

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Image Measurement Based Control

Microcapsule Manufacturing

We have used image-based optical sensing for measurement and feedback control of complex processes. In one case, it was necessary to measure the size and shape of microcapsules as they were formed in order to control the extruder parameters to maintain quality. This system included a high-speed video camera with high-magnification lens and strobe lighting to capture images of the capsules as they fell from the extruder. Image analysis determined the size and shape of the capsules, and control algorithms were used to adjust the extruder speed and pressure.

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Spectral Analysis

SwRI experience includes the spectrum from longwave infrared to ultraviolet. Many applications make use of multispectral techniques, comparing optical signals in infrared, visible and UV. SwRI patented a unique sensor that used optical reflectance in two IR bands to detect the presence of coatings on aircraft materials. Other experience includes multiband fiberoptic spectrophotometer applications, UV fluorescence imaging, and analysis of hyperspectral images.

For more information about optical and control systems capabilities at SwRI or how you can contract with SwRI, please contact Michael P. Rigney, Ph.D. at mrigney@swri.org or (210) 522-5104.
 

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Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.

July 09, 2008