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LAND have developed a range of application dedicated products for the following :

Measuring Temperature of Optical Fiber Drawing Tower Furnace
Measuring Optical Fiber Preform Temperature

If your specific area of interest is not covered here, our engineers will be pleased to discuss your requirements with you.

If you would like more detailed product information please use the Literature Request page.

 
Further Information
 
   
 
Literature Downloads
 
 
A range of PDF downloads is available for these products >>>

 
     

MEASURING TEMPERATURE OF OPTICAL FIBER DRAWING TOWER FURNACE
 
Temperature measurement of the optical fiber drawing tower furnace

Drawing tower furnace thermometer
  In order to draw high quality low loss optical fiber with the required strength and attenuation the temperature of the drawing tower furnace must be stable and precisely controlled.
The furnace lining can get close to melting point so its temperature is monitored and used as the heating control parameter.
Measurement Problems Graphite resistance and Induction-heated zirconia furnaces operating at high temperatures, typically 2200°C/4000°F, make contact methods of temperature measurement impractical.
The thermometer requires a small target size to view between the coils in an induction heated furnace, or sight down a narrow tube on to the zirconia susceptor.
In the case of a graphite resistance type furnace the thermometer has to sight through a quartz window, down through a narrow tube onto the heating element.
Experience has shown outstanding benefits by using short wavelength thermometers, for this application in order to achieve maximum accuracy.
A silicon cell detector gives high stability, rapid response and high rate of change of output with temperature.
A small target size is offered, with a measurement spot size of 4mm/0.15in diameter at the focus distance of 450mm/17.7in.
The thermometer provides high level signal to noise output for retransmission to a readout or control system.

Individually calibrated thermometers are available with traceability to National Standards. UKAS or NIST Calibration certificates are available.
Features
2m/6.5ft light guide length
Small target capability
Rugged, flexible, modular design
Accurate, reliable, drift-free measurement
Industry standard outputs to suit any process monitoring, recording or control system
Standard industry mounting

A Literature download on the Optical Fiber Drawing Tower Furnace is available
Last Modified (25/07/02) 59KB.
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MEASURING OPTICAL FIBER PREFORM TEMPERATURE
 
Measuring optical fiber preform temperature

The Vapour Deposition Thermometer (VDT)
  Efficient, high yield production of low loss, high bandwidth optical fiber for telecommunication demands precise measurement and control of preform temperature during the various deposition processes employed.
The temperature of the preform in the burner zone, where the deposition takes place, is one of the critical control parameters which determines fiber strength and transmission quality.
Measurement Problems The deposition process can be accomplished in various ways i.e. Inside Vapour Deposition (I.V.D.P.), Outside Vapour Deposition (O.V.D.P.), Modified Chemical Vapour Deposition (M.C.V.D.).
The Vapour Deposition Thermometer (VDT) must be able to sight precisely onto the rotating preform and avoid the effects of the flames, as the burner is traversed along the lathe.
Accurate surface temperature measurement can only be achieved using dedicated non contact radiation thermometers such as the LAND VDT.
Over twenty years of experience in this application has shown that thermometers operating in the waveband 4.8 to 5.2µm are the most suitable.
In this waveband, the preform is opaque and the measurement unaffected by the flames.
An accurate sighting facility and small target capability is given by focusable 100:1 optics.

Individually calibrated thermometers are available with traceability to National Standards. UKAS or NIST Calibration certificates are available.


Features
Focusable, through-the-lens sighting - optional laser targeting is available
Wide range of highly effective mounting accessories
Rugged, flexible, modular design
Accurate, reliable, drift-free measurement
Industry standard outputs to suit any process monitoring, recording or control system

A Literature download on the Optical Fiber Preform Temperature is available
Last Modified (25/07/02) 43KB.
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