Major glass manufacturer cuts distortion with tempering/toughening solution from LAND

Before the use of low emissivity glass it was relatively easy to measure the temperature of the glass as it exited the Glass Tempering oven by using a 5µm waveband thermal linescanner. Low emissivity glass, sometimes referred to as soft coated Low E glass is coated on one side. It is processed through a tempering/toughening oven with the soft coated side up to prevent damage to the coated side from the support rolls underneath. This makes measuring the glass surface temperature with a top mounted linescanner almost impossible. There are many grades of low emissivity coated glass and their emissivity values are very low and each grade has a different emissivity value. There simply isn't enough room under the glass to mount a scanner to view the uncoated underside. A solution had to be found. Solution Using a LAND LSP-HD 50 infrared linescanner scanning from above is supplemented by a secondary sensor under the line. This sensor is usually a LAND Solonet 5 (SN5) with laser alignment. The Solonet is positioned to measure a narrow stripe along the underside of the glass. The location of this stripe is matched to a compensation zone for the LSP-HD 50 scanner above. The LSP-HD 50 temperature profile is amplified to match the underside temperature from the SN5. The remaining profile is amplified by the same percentage to achieve a fully corrected thermal image of the low emissivity coated glass.

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