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The present invention provides a simple method for fabricating fiber-optic glass preforms having complex refractive index configurations and/or dopant distributions in a radial direction with a high degree of accuracy and precision. The method teaches bundling together a plurality of glass rods of s

The present invention provides a simple method for fabricating fiber-optic glass preforms having complex refractive index configurations and/or dopant distributions in a radial direction with a high degree of accuracy and precision. The method teaches bundling together a plurality of glass rods of specific physical, chemical, or optical properties and wherein the rod bundle is fused in a manner that maintains the cross-sectional composition and refractive-index profiles established by the position of the rods.

대표청구항 ▼

The present invention provides a simple method for fabricating fiber-optic glass preforms having complex refractive index configurations and/or dopant distributions in a radial direction with a high degree of accuracy and precision. The method teaches bundling together a plurality of glass rods of s

The present invention provides a simple method for fabricating fiber-optic glass preforms having complex refractive index configurations and/or dopant distributions in a radial direction with a high degree of accuracy and precision. The method teaches bundling together a plurality of glass rods of specific physical, chemical, or optical properties and wherein the rod bundle is fused in a manner that maintains the cross-sectional composition and refractive-index profiles established by the position of the rods. 000, Greenaway et al., 385/126; US-6418258, 20020700, Wang, 385/125; US-6427491, 20020800, Burke et al., 065/403 pressor using the saturated discharge temperature; and controlling the expansion device within the refrigerant loop in response to the computed discharge superheat, wherein said step of computing a discharge superheat includes the step of generating a mathematical algorithm for computing the discharge superheat that is based upon the capacity of the at least one compressor within the refrigerant loop. 2. The process of claim 1 wherein said step of computing a discharge superheat includes tho steps of: sensing the pressure between the evaporator and the inlet of the at least one compressor; and computing a theoretical discharge temperature corresponding to a zero degree suction superheat as a function of the sensed pressure at the outlet of the at least one compressor and the sensed pressure between the evaporator and the inlet of the at least one compressor. 3. The process of claim 2 wherein said step of computing a theoretical discharge temperature includes using at least one constant applied to the sensed pressure at the outlet of the at least one compressor or the sensed pressure between the evaporator and the inlet of the at least one compressor wherein the constant is selected based upon the capacity of the at least one compressor within the refrigerant loop. 4. The process of claim 2 wherein said step of computing a discharge superheat includes the steps of: computing a theoretical discharge superheat based upon the computed theoretical discharge temperature corresponding to zero degree suction heat; and adding a discharge superheat correction factor to the computed discharge superheat. 5. The process of claim 2 wherein the refrigerant loop contains a plurality of compressors each of which may be activated in response to the cooling demand placed upon the cooling system and wherein said step of computing a discharge superheat using the saturated discharge temperature comprises the step of: generating a mathematical algorithm for computing the discharge superheat that is based upon the number of active compressors within the refrigerant loop. 6. The process of claim 2 wherein the refrigerant loop contains a plurality of compressors each of which may be activated in response to the cooling demand placed upon the cooling system and wherein said step of sensing temperature and pressure of the outlet of the at least one compressor includes the step of sensing temperature and pressure at a common manifold outlet of the compressors and wherein said step of computing a discharge superheat includes the steps of: sensing pressure between an evaporator and a common manifold inlet of the compressors; and computing at least one theoretical discharge temperature corresponding to a zero degree suction superheat as a function of the sensed pressure at the common manifold outlet of the compressors and the sensed pressure at the common manifold inlet of the compressors. 7. The process of claim 6 wherein said step of computing at least one theoretical discharge temperature includes using at least one constant applied to the discharge pressure or the suction pressure wherein the constant is selected based upon the number of activated compressors within the refrigerant loop. 8. The process of claim 6 wherein said step of computing a discharge superheat includes the steps of: computing a theoretical discharge superheat based upon the computed theoretical discharge temperature corresponding to zero degree suction heat; and adding a discharge superheat correction factor to the computed discharge superheat. 9. The process of claim 1 wherein said of controlling the expansion device in response to the computed discharge superheat includes the steps of: determining an actual discharge superheat; determining whether the actual discharge superheat is within a range of predetermined values; and changing the refrigerant flow rate through the expansion device when the actual discharge superheat is outside of th