Archive | February, 2018

Curved Glass Shape Turnkey Solution

Philtec has partnered with the Italian company Technosens to provide the complete turnkey solution for automatic production lines. The method used is to compare a production piece glass shape to the shape of a master frame as shown here.

The production line glass is placed against the master frame, and Philtec’s non-contact sensors measure distance to the glass at 50 locations. With data from 50 sensors, the shape of the glass is accurately mapped. Philtec’s non-contact optical sensors provide a scratch-free solution that is ideal for thin glass, where contact gages such as LVDTs can move and distort the glass when applied via air pressure.

With Technosens equipment, each measured piece has a complete traceability and the production is real time monitored with advanced statistics on process, moulds, system analysis (SPC, MSA) to have the maximum reduction of discarded pieces.

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Sensor Probe Installations with Tilt

Sensor probes are to be generally mounted normal (perpendicular) to a target surface. With some applications, such as displacement of a cantilever beam, the target surface rotates as deflects. In other applications, due to installation constraints, the probe can not be mounted normal to the surface. In applications where tilt is unavoidable, what sensors can be used?

Our latest application note Sensor Applications With Tilt provides guidance on sensor performance and selection.

 

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Fiber Optic Displacement Probes in Liquid Oxygen

When the cryogenic medium is Liquid Oxygen (or Liquid Natural Gas), calibration in water is a better approximation than calibration in air:
Air Refractive Index = 1.000
Liquid Oxygen Refractive index = 1.221
LNG Refractive Index = 1.286
Water Refractive Index = 1.332

A sensor’s operating range is extended in proportion to the ratio of the refractive indices.

For example, to calculate a sensor’s response in LOX, first calibrate the sensor submerged in water. Then remap the displacement data by the ratio 1.221/1.332.

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