Infra-red thermometers aid fibre production
A
Land Instruments International product story
Edited by the Engineeringtalk editorial team
Sep 27, 2002
Land Instruments International has developed two new application specific infra-red radiation thermometers for monitoring the temperature of optical fibres during preforming and drawing.
Land Instruments International has developed two new application specific infra-red radiation thermometers for monitoring the temperature of optical fibres during preforming and drawing.
The success of both processes depends on precise temperature control, which in practice can be achieved only by noncontact methods.
For preforming, the company has introduced its new VDT vapour deposition thermometer, which monitors the temperature of the preform as it rotates on the lathe.
The new VDT meets two criteria for successful temperature measurement.
VDT has a narrow angle field of view (100:1) which allows it to be sighted precisely on to the preform; and it operates at a wavelength of 4.8 to 5.2um, at which the preform is opaque and measurement is unaffected by the burner flames.
Two versions of the thermometer are available: a stand-alone instrument (VDT-U) and a system version (VDT-S).
VDT-S is used with a Landmark Graphic signal processor and is intended for multiple preforming lines incorporating up to four thermometers per system.
The temperature measurement range for both versions is 1000 to 2500C.
At the fibre drawing stage the furnace lining temperature is used as the heating control parameter, which can be measured using the new DTT fibre-optic drawing tower thermometer.
Suitable for measuring temperatures from 800 to 2600C, the DTT has an operating wavelength of 1um and a 4mm measurement spot diameter at the focus distance of 450mm (112:1 FOV), which allows sighting on to the furnace lining.
A 2m-long fibre-optic light guide facilitates access to the target and enables the detector and electronics enclosure to be located remotely from the furnace.
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