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NIR optics characterization

NIR optics characterization
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Industrial quality control – HASO for ensuring the quality of NIR optical components In the sector of industrial detection, the ability to massproduce reliable, high-quality optical components is synonymous with maintaining competiveness. Today’s motion sensors integrate multiple optical elements into complex arrays. Making sure that components are compliant with factory specifications before they are integrated into final products is not only an effective means of cutting costs by reducing waste, but is equally important for ensuring ongoing customer satisfaction.

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B.E.A., located in Liège and part of the HALMA group, designs, produces and markets a variety of remote presence and motion detection products for pedestrian, industrial and mass transit applications. A number of their products incorporate plastic lenses and mirrors optimized for the near-infrared (NIR - <1000 nm) spectrum produced by third-party manufacturers. B.E.A.’s reputation for excellence places severe requirements on the quality of the lenses provided by subcontractors. For their products, the necessary quality of integrated optical components approaches the limits of what is...

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• Ultra-precise, absolute measurement – HASO3-128 provides true absolute measurement of both the phase and intensity with a remarkable accuracy of λ/100 rms in absolute mode and λ/150 rms in relative mode. In laboratory conditions where repeatability is essential, HASO3-128 offers unparalleled performance at λ/200 rms. • Wide dynamic range without compromising accuracy – The quality of HASO3’s microlens arrays, combined with their patented Dynamic Spot Tracking™ and Auto Spot Finder™, enables Imagine Optic’s wavefront sensors to measure wide-ranging aberrations in even the most...

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to evaluate the mirror's mechanical and thermal behavior. As the figures below show, the mirrors are rectangular and thereby create a highly-deformed far-field pattern, yet they are still easily measured by Figure 4 - Measurements of a flat plastic mirror with mechanical and thermal constraints. Figure 5 - Measurements of a flat glass mirror. Figure 6 - Measurements of a highly-deformed plastic mirror. Characterizing the alignment & collimation of optical assemblies B.E.A. uses the same HAS03-128 to verify the alignment and collimation of optical assemblies on R&D laboratory and on...

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For each measured lens, the value of α is measured at 4 positions along the x-axis, and the data is fed through a system of overdetermined equations. The resulting f value is calculated using the ordinary least squares (OLS) method for statistical analysis. In order to limit the influence on measurements that offaxis aberrations can produce, x is maintained close to 0 (the optical axis). One potential drawback is that the lack of leverage in the micrometric translation along the x axis may result in a loss of accuracy. The photograph in Figure 8 displays the test bench setup and lens...

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Green = Linearity; Red = Calculated EFL Conclusion HASO3 has proven itself to be a polyvalent and invaluable tool for B.E.A. From the laboratory to the production floor, B.E.A.’s engineers use the unique functionalities provided by their HASO3 128 and its HASOv3 companion software to achieve results in optical alignment, quality control, thermal control and behavior under mechanical constraints. Although B.E.A. only uses a portion of HASO3’s accuracy, the fact that their engineers can choose the level they want is a key value point. For B.E.A., HASO has become an essential part of their...

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