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Production method of optical fiber F-P cavity sensor

A manufacturing method and sensor technology, which are applied in the direction of using optical devices to transmit sensing components, coupling of optical waveguides, etc., can solve problems such as poor sealing performance, inability to withstand high temperature strength, and inability to apply, and achieve uniform angular stress and sealing performance. Good and reliable effect

Active Publication Date: 2015-11-11
LASER RES INST OF SHANDONG ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The welding of the optical fiber F-P cavity is mainly to fix the optical fiber inserted into the capillary glass tube and the capillary glass tube. In the literature "Phase-shifted transmission / reflection-type hybridextrinsic Fabry-Perotinterferometric fibersensor" and the literature "ExtrinsicFabry-PerotInterferometerSystemUsingWavelengthModulatedSource" epoxy resin is used to bond the optical fiber and the capillary , due to the instability of epoxy resin glue at high temperature, there is creep, resulting in unstable performance of epoxy resin glued optical fiber F-P cavity, can not withstand high temperature and poor strength, poor sealing performance and other shortcomings, can not be applied to the harsh environment of oil wells
In the literature "Study on the packaging method of optical fiber F-P interferometer sensor", the single-side high-frequency CO2 pulse laser thermal fusion fixation method is used. Due to the uneven force at the solder joint, this method is easy to cause the capillary glass tube to bend and deform at the solder joint. In addition, due to only one-sided heat fusion, even if the optical fiber is welded to the glass tube, it cannot guarantee complete sealing
In the document "FiberOpticalpressure and temperature sensors for oildownhole application", three CO2 laser beams forming 120° are used to fix the optical fiber and the capillary glass tube by thermal melting. However, due to the small diameter of the capillary glass tube, very fine adjustment is required, the system requires high precision and the cost of building the system is high

Method used

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  • Production method of optical fiber F-P cavity sensor
  • Production method of optical fiber F-P cavity sensor
  • Production method of optical fiber F-P cavity sensor

Examples

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Embodiment 1

[0032] like Figure 1-2 As shown, a manufacturing device of an optical fiber F-P cavity sensor, it includes a device bracket 1 provided with a fixing seat 5, in which a tapered roller bearing 4 is fixed; the top of the hollow fixed shaft 3 and the hollow three-claw clamp The disk 2 is fixedly connected; the middle part of the fixed shaft 3 passes through the tapered roller bearing 4 and is supported and fixed on the device bracket 1 and pivots around the axis of the fixed shaft 3 relative to the device bracket 1. The bottom of the fixed shaft 3 is fixedly connected with the large synchronous pulley 6 ;; The small synchronous pulley 7 driven by the large synchronous pulley 6 and the stepper motor 8 is driven by a belt; the hollow tube shaft 18 passes through the center of the three-jaw chuck 2 and the fixed shaft 3, and the upper part of the tube shaft 18 is clamped by the three-jaw The disc 2 is clamped and rotated with the three-jaw chuck 2. The lower end of the tube shaft 18...

Embodiment 2

[0034] Embodiment 2: The similarities between this embodiment and Embodiment 1 will not be repeated, the difference is that it is a method for manufacturing an optical fiber F-P cavity sensor, which uses the manufacturing device for an optical fiber F-P cavity sensor described in Embodiment 1 , which includes the following steps: (1) Build the welding system device, fix the tapered roller bearing 4 in the fixed seat 5, extend the fixed shaft 3 into the three-jaw chuck 2 and the tapered roller bearing 4 and fix it, and use a tight The fixed nut 12 fixes the position of the large synchronous pulley 6, and connects the small synchronous pulley 7 and the stepper motor 8, and extends the tube shaft 18 into the gap between the three-jaw chuck 2, the fixed shaft 3 and the tapered roller bearing 4 , and inserted into the tube shaft base 19, the tube shaft 18 and the tube shaft base 19 realize dynamic sealing through the seal ring 23, the tube shaft base 19 is fixed on the device bracke...

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Abstract

The invention provides a manufacturing device of an optical fiber F-P cavity sensor and a manufacturing method thereof. The manufacturing device comprises a bracket, a stepping motor, large and small synchronous belt wheels, a three-jaw chuck, a tapered roller bearing, a vacuum pump, an oxyhydrogen flame hot melting machine, and a capillary glass tube clamp. One end of a capillary glass tube is welded by oxyhydrogen flame, the other end of the capillary glass tube is inserted into a fiber, and the capillary glass tube is inserted into the capillary glass tube clamp. A tail fiber passes through a tube shaft and is fixed and sealed by a rubber washer and a fixing nut. The rotating speed is in a range of 120r / min to 140r / min. The heating of the capillary glass tube is uniform. The vacuum pump is connected with a tower joint and the capillary glass tube is pumped into vacuum while the clamp is rotated. At the same time, the capillary glass tube is heated and melted by the oxyhydrogen flame hot melting machine, and under the effect of pumping, a capillary glass tube wall is collapsed inward to melt the fiber with the capillary glass tube. According to the melting method, the capillary glass tube and the fiber are firmly melted, the sealing performance is good, the penetration of oil and moisture from a welding point to damage an F-P cavity can be effectively prevented, and a solid foundation is laid for the long-term application of the optical fiber F-P cavity sensor in a harsh environment.

Description

[0001] This application is a divisional application of a Chinese invention patent application with an application date of December 7, 2013, an application number of 2013106688720, and a Chinese invention patent application titled Manufacturing method and manufacturing device of an optical fiber F-P cavity sensor. technical field [0002] The invention belongs to the technical field of optical fiber sensors, and relates to a manufacturing method of an optical fiber pressure sensor, in particular to a manufacturing method and a manufacturing device of an optical fiber F-P cavity pressure sensor. Background technique [0003] In the process of oilfield development, it is necessary to monitor downhole temperature, pressure and other parameters in real time to understand the physical state of the downhole to optimize the oil recovery plan and improve oil recovery efficiency. Due to the harsh environment downhole, traditional electronic sensors cannot work stably for a long time dow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G02B6/255
Inventor 王英英王昌刘小会郭士生
Owner LASER RES INST OF SHANDONG ACAD OF SCI
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