Bena Optics' Advanced Large Aperture Aspheric Testing Solutions

Bena Optics' Advanced Large Aperture Aspheric Testing Solutions

Large aperture aspheric surfaces present significant challenges in terms of testing and measurement due to their complex geometries and the need for high precision. Bena Optics addresses these challenges with advanced testing technologies that ensure precise and reliable results.

The Challenge of Large Aperture Aspheric Testing

Testing large aperture aspheric surfaces is inherently more difficult than testing planar or spherical surfaces. The extended optical paths required for large apertures add complexity, particularly in achieving high measurement accuracy.

Key Challenges:

Extended Optical Paths: Longer paths increase the risk of environmental disturbances, affecting measurement precision.

Complex Surface Geometry: Aspheric surfaces require sophisticated methods to accurately measure their complex shapes.

Testing Methods for Large Aperture Aspherics

Coordinate Measurement Technology

Coordinate measurement is a direct approach for assessing the surface shape of aspheric optics. It involves the use of high-precision displacement sensors to scan discrete points on the surface, reconstructing the entire surface profile through mathematical interpolation.

Contact vs. Non-Contact: Traditionally, contact methods like coordinate measuring machines (CMM) and profilometers were used. Non-contact optical probes have now emerged, offering higher precision and avoiding surface damage.

Precision Advancements: Modern non-contact probes achieve sub-nanometer precision, comparable to interferometric methods.

LUPHOScan: A Breakthrough in Aspheric Measurement

LUPHOScan, developed by Taylor-Hobson, is a revolutionary non-contact 3D surface topography measurement system designed for ultra-precision surfaces, including aspherics and freeforms.

Multi-Wavelength Interferometry (MWLI): Utilizes MWLI point sensors to continuously measure the distance to the test piece.

360° Rotational Platform: Allows for comprehensive surface scanning by rotating the test piece.

High Precision: Delivers precise, point-cloud data that reveals surface deviations with high accuracy.

Interferometry: The Gold Standard for High Precision

Interferometry is the primary method for high-precision optical surface testing, offering high accuracy and rich sampling points.

Principle of Operation: Involves using a high-quality reference mirror to compare with the test surface, generating interference fringes that reveal surface errors.

Challenges in Large Aperture Testing: Requires specialized techniques like null compensation (e.g., CGH) and non-null methods (e.g., sub-aperture stitching) to address the limitations of standard interferometers in measuring large aspheric surfaces.

Modern Interferometers: Incorporate advanced phase demodulation algorithms, making them indispensable tools in optical metrology.

Applications and Benefits of Bena Optics' Testing Solutions

Precision in Optics Manufacturing

Bena Optics' testing solutions ensure that each optical component meets the stringent accuracy requirements necessary for high-performance applications.

Wide Range of Applications

From aerospace to medical imaging, Bena Optics' testing technologies support industries where precision optics are critical.

Continuous Innovation

Bena Optics remains at the forefront of optical testing technology, continuously developing new methods and tools to meet the evolving needs of the industry.

Conclusion: Precision and Reliability with Bena Optics

Bena Optics' advanced large aperture aspheric testing solutions provide the precision and reliability required for high-performance optics. Whether through coordinate measurement, interferometry, or innovative systems like LUPHOScan, Bena Optics ensures that every surface meets the highest standards of accuracy.

Visit our website to explore our full range of testing solutions and discover how we can help you achieve superior optical performance.