Diffusive Lenses Radii Measurement

Diffusive Lenses Radii Measurement

One of the challenges of the optical manufacturer is measuring a lens curvature and its radius. Producing a lens has a long process from the raw material stage until the final product is created, which is polished and curved, either spherical or aspherical.

Measuring a polished and transparent flat lens is possible, albeit challenging. Measuring a polished and transparent lens which is curved is even more challenging since the signal back-reflection has to go inside the detector in order to get a measurement. The angular coverage of a laser sensor over glass is very limited and stands over a few degrees only.
Along the lens manufacturing process there is a stage where the lens is still diffusive after its grinding, and before polished. Such condition is perfectly suitable for measuring by a non-contact laser sensor. Other technologies which are also used today are manual spherometer and a touch probe. Both are relatively slow process and a non-contact sensor can make the measurement much faster.

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Screen Scratch Inspection

Screen Scratches Inspection

Nowadays a lot of glass screen manufacturers have to monitor their process constantly. Among the different measurements are glass thickness, glass coating thickness and scratch inspection.

Many products such as computer touch screens, phone screens and LCDs have those needs. Most of the tests are done today in Far-East countries such as Korea, China and Japan, but not exclusively. Many of them use vision equipment in order to cover large areas, and combine this with high-resolution laser sensors over local detected “suspicious areas.”

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Optical Measurement of Narrow Holes

Optical Measurement of Narrow Holes

Measuring deep, narrow holes with a ratio of 1:5 (diameter: height) has always been a difficult and largely unsolved problem. It gets worse when we consider that not only the bottom surface needs to be scanned, but also the side walls which are characterized with steep angles that sometimes exceed 75°. This often causes multiple reflections from the side walls, which ruin the signal.

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High Speed Tire & Rubber Inspection

conopoint tire scan

Tire manufacturers need to inspect their tire grooves with its sharp angles and hard geometry. High quality tires are usually made out of black rubber which is more challenging to measure due to its low reflection signal. The problem becomes even more challenging when there are paint marks on the tire which are a different color, with a different back signal. The Optimet sensors provide both SNR parameter and also “Total”, which is the amount of light used by the detector on every surface. Both in R&D sections and on the manufacturing floor, engineers are using sensors to monitor the tire erosion, and to better understand the effects of sipes geometry on the tire’s performance.

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How to control laser focus in real time

microscopic picture of a slope done with laser engraving technology

New materials, component design and manufacturing, along with requirements for high quality products are the dominant drives for continuous performance improvements in laser drilling, cutting and welding systems.

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Tire Molds Inspection

Flickr creative commons image via Karyn Christner

Driving your car at night on a slippery road, you sure hope the tires have a good grip on the pavement.

But how do you know that they do?

Your tire manufacturer measured them with a 3D scanning sensor.

Let’s see how it’s done… 

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Challenging 3D Scans: Undercuts, Side Walls, and Inside Holes and Tubes

ConoPoint with Periscope

Ever try to use a non-contact distance measurement sensor (or optical sensor) to measure the inside of a narrow hole or tube?

How about scanning undercuts or side walls of 3D objects?

If you have, you probably know that it is not an easy task and can be expensive and complicated.  Typical triangulation-based sensors will certainly not capture these difficult shapes.  Even collinear sensors won’t be able to measure the 90° angles and hidden surfaces completely.

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Non-Contact Distance Measurement Technologies

So, you want to measure the shape of an object, perform a 3D surface scan or conduct surface metrology tests. Google tells us there are many measurement methods to achieve these goals. Problem is, which one’s best for you?

Object-measurement techniques can be divided into two basic categories: contact and non-contact. In the former, the object has to touch the sensor, which usually complicates the measurement process, slows it, and can possibly damage the object we examine. Moreover, if the measured object is a soft material, like rubber, textile or tissue, it can’t be measured at all. So here we’ll only discuss non-contact measurement sensors, in which the sensor and the object to be measured are separated from each other.

It all comes down to determining the precise distance between the two and moving one with respect to the other, in order to reconstruct the object’s shape. This goal can be achieved using various optical techniques, each best suited for a different type of application.

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