The Lumenarium: The official blog of Lumetrics, Inc.

Certification of Contact Lenses as Calibration Standards

Posted May 18, 2020 by Kristin

Quality control processes can often lag behind advances in technology. For example, ultrasonic sensors that require daily cleaning and re-calibration are widely utilized despite the existence of more accurate and maintenance-free optical metrology solutions. To bridge this gap, manufacturers adopt cutting-edge technology to certify standards. These standards are used to calibrate or confirm performance of older deployed equipment.

The attached application note provides details of such a process employed by contact lens manufacturers to certify standards for calibration of ultrasonic sensors. Lumetrics has a dedicated laboratory where our proprietary light based measurement technology is used for certifying contact lens standards based on center thickness and sagittal height.

filed under: contact lens measurement system, Non contact thickness measurement

Measuring Thickness Uniformity of an Adhesive Deposited on Top of a Porous Substrate

Posted April 23, 2020 by Kristin

Abstract — We describe a technique for non‐contact thickness measurement that can be applied for samples that do not have smooth reflecting surfaces. An example is an adhesive deposited on top of a foam substrate. We use low‐coherence interferometery to obtain an array (a scan) of single‐point measurements using standard OptiGauge Control Center (OCC) software. We describe the algorithm for data processing to extract the effective thickness data for the adhesive layer.

filed under: Non contact thickness measurement, non contact measurement of intraocular lenses

Non-Contact Measurement of Intraocular Lenses

Posted April 16, 2020 by Kristin

Abstract — We describe an optics‐based technique for non‐contact measurements of the thickness parameters of intraocular lenses (IOLs). The technique is based on time‐domain low‐coherence interferometry (LCI) using a beam of light directed to a point on the measurement surface. We show how this technique can be used to measure the difference in thickness of the opposite haptics, and to measure the center thickness of the IOLs located on a mandrel or suspended in a solution.

filed under: Non contact thickness measurement, non contact measurement of intraocular lenses

Multi-layer Measurement with the Lumetrics OptiGauge II

Posted March 16, 2020 by Kristin

The OptiGauge II is a user-friendly non-contact thickness measurement system for multi-layer materials that delivers reliability and sub-micron accuracy so vital to today’s most advanced industries. The OptiGauge II can be particularly useful in Quality, R&D labs, and production floors because it can improve yields, reduce costs, increase quality, and meet compliance requirements.

Multi-layer Measurement with a Lumetrics OptiGauge II

filed under: multi layer thickness measurement, Non contact thickness measurement, OptiGauge II

Lumetrics, Inc. CEO and CTO at Photonics West

Posted February 18, 2020 by Kristin

The 2020 SPIE Photonics West exhibition and trade show was a huge success- Lumetrics, Inc. CEO and Founder, John Hart and CTO Filipp Ignatovich discuss non contact thickness measurement and Lumetrics' capability to measure multilayer structures and characterize material composition. 


filed under: Non contact thickness measurement, transparent armor

New Application Note and Photonics West 2020 Updates

Posted January 09, 2020 by Kristin

We hope 2020 is off to a great start for everyone- we have an upcoming event and a new application note for you!

New Application Note: In this application note, our engineers provide an overview of the user-friendly software application developed for the purposes of measuring tubing using the OptiGauge II non contact thickness measurement system.

filed under: Non contact thickness measurement, OptiGauge, Photonics West

Windshield Wedge Angle and Curvature Measurement Solution

Posted June 26, 2019 by Kristin
As Automotive Glazing technology advances, such as with heads up displays (HUD), the metrology demands associated with manufacturing automotive windshields become more complex.

filed under: Non contact thickness measurement

Transparent armor

Posted June 26, 2019 by Kristin

Abstract: A method of identifying the material and determining the physical thickness of each layer in a multilayer structure is disclosed.The method includes measuring the optical thickness of each of the layers of the multilayer object as a function of wavelength of a light source and calculating a normalized group index of refraction dispersion curve for each layer in the multilayer structure.  The measured normalized group index of refraction dispersion curves for each of the layers is then compared to a reference data base of known materials and the material of each layer is identified.  The physical thickness of each layer is then determined from the group index of refraction dispersion curve for the material in each layer and the measured optical thickness data.  A method for determining the group index of refraction dispersion curve of a known material is also disclosed.

filed under: Non contact thickness measurement

OptiGauge 2000

Posted February 15, 2019 by Kristin

 Lumetrics is pleased to introduce a brand new product to our OptiGauge portfolio: the OptiGauge 2000.  This non-contact thickness measurement system is based on the time-domain low-coherence interferometry. This technology enables absolute thickness measurement of any material, which is transparent or partially transparent to the measurement light. The OG-2000 uses infrared light with the center wavelength of approximately 2 microns. The OG-2000 is designed to measure specialty and rare materials, such as Germanium, Gallium Arsenide, Beryllium, nano-composite optical ceramics and others. Conventional glass and plastic materials can be measured as well. Our patented technology allows for fast real-time measurements, and can be used for on-line process control as well as off-line quality control purposes.

filed under: Non contact thickness measurement

Refractive Index Measurement System for Contact Lens in a Natural Hydrated State

Posted February 01, 2019 by Kristin

A collaboration between Lumetrics and Johnson & Johnson

Accurate refractive index of the contact lenses is one of the most important parameters needed to properly evaluate the lens performance. Measurements of the refractive power and other optical properties of the lenses are typically conducted in solution, and converted to in-air performance. Such an approach is very sensitive to errors in the refractive indices of both the lens and the solution.

filed under: contact lens, contact lens inspection, Non contact thickness measurement, Opthalmic

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