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Equipment and method for conducting PID controlled optical fiber prefabricated rod sintering with laser

An optical fiber preform and laser technology, which is applied in glass manufacturing equipment, manufacturing tools, etc., can solve the problems of not completely solving the problem of optical fiber preform transparency, inability to improve efficiency, and fixed sintering speed.

Inactive Publication Date: 2016-07-20
JIANGSU HENGTONG PHOTOELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sintering speed of this method is fixed, and the efficiency cannot be improved. At the same time, there is an important problem in this method: the laser that detects whether the transparency is located outside the high-temperature area. When the laser detects a power drop, the area is far away from the high-temperature area. Temperature may cause air bubbles that have passed through the high temperature zone but have not yet been discharged to be sealed in the core layer, resulting in poor transparency. Therefore, simply increasing the sintering temperature and setting the laser detector installation position at will cannot completely solve the problem. Transparency of optical fiber preform

Method used

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  • Equipment and method for conducting PID controlled optical fiber prefabricated rod sintering with laser
  • Equipment and method for conducting PID controlled optical fiber prefabricated rod sintering with laser
  • Equipment and method for conducting PID controlled optical fiber prefabricated rod sintering with laser

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Experimental program
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Effect test

specific Embodiment 1

[0038] Specific embodiment one: see image 3 The laser transmitter 15 and the laser receiver 16 correspond to the formed laser penetration axis 21 and are located at 150mm below the half-height plane 20 of the heater 11. The transmitter and the laser are on the same horizontal line, and the width of the laser beam emitted by the laser transmitter 15 is 0.5D ﹤d﹤D, D is the average outer diameter of the loose body after complete vitrification. In the initial debugging stage of the equipment, a beam of power P is emitted by the laser transmitter 15 a The laser light passes through the outer shell 13, the insulation layer 12, the heater 11, the muffle tube 17 and the loose body after complete vitrification provided for debugging, and the power received by the laser receiver 16 is P b , move up and down, and rotate the fully vitrified loose body to obtain (P a -P b ) is the initial P 0 , the coefficient m is determined during commissioning, and it is guaranteed to be 1.0mm / min≤...

specific Embodiment 2

[0041] See image 3 , the laser transmitter 15 and the laser receiver 16 correspond to the formed laser penetration axis 21 and are located at 180mm below the half-height plane 20 of the heater 11. In the initial debugging stage of the equipment, use the same method as in Example 1 to determine P 0 , the coefficient n is determined during commissioning, and it is guaranteed to be 1.0mm / min≤V≤8.0mm / min;

[0042] After the dehydration of the loose body 4 is completed, it is lifted upwards, and when the tip reaches the half-height plane 20 of the heater 11, the displacement sensor in the lifting device 8 is set to 0, and a position sensor is provided in the lifting device 8 to detect displacement, and the heater 11 starts heating After 30 minutes, the furnace temperature rises to (1490±20)°C, the vitrification step starts, the laser transmitter 15 and the laser receiver 16 are powered on, and ΔP is calculated according to formula 1. At this time △P0 , indicating that the loose b...

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Abstract

The invention provides equipment for conducting PID controlled optical fiber prefabricated rod sintering with laser.A pair of laser transmitter and laser receiver are utilized to monitor the sintering situation in real time, therefore the feeding speed of a lifting device is controlled in real time, and transparency of an optical fiber prefabricated rod obtained after sintering is guaranteed.The equipment comprises a muff tube, the outer annular surface of the middle segment of the muff tube is provided with a heater, a heat preservation layer is arranged outside the heater and integrally arranged in an outer layer shell, the top of a loose body is provided with a connection rod, and the loose body is located in the muff tube under the sintering state.The equipment I characterized in that the top end of the connection rod is exposed out of the top of the muff tube, the top of the connection rod is connected with the lifting device, a speed control component of the lifting device is externally connected to a control system, and the pair of laser transmitter and laser receiver are arranged at the positions, corresponding to the heating area of the heater, of the outer walls on the two sides of the outer layer shell.

Description

technical field [0001] The invention relates to the technical field of sintering optical fiber preform rods, in particular to a device for sintering optical fiber preform rods using laser light for PID control. The invention also provides a method for sintering optical fiber preform rods using the device. Background technique [0002] In the manufacturing process of optical fiber preform, the silica dust precursor (or so called loose body) is usually produced by OVD, VAD and other methods first, and then the loose body is placed in a sintering furnace, and chlorine, helium and other gases are introduced to remove it. Remove the water and hydroxyl groups, and then continue to heat up to make the loose body vitrified into an optical fiber preform. The loose body is a porous structure, and the density is generally (0.25-0.6) g / cm 3 Between, the density distribution on the cross section is as figure 1 As shown, 1 means that the density of the core is higher, and the density gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/014
CPCC03B37/0146C03B37/01446
Inventor 胡付俭柏文俊马康库劳雪刚杜森冯程
Owner JIANGSU HENGTONG PHOTOELECTRIC