Method for making amber cavity and apparatus by optical fiber method

Abstract

The invention relates to a non-intrinsic fiber - Perot cavity production methods and devices, it belongs to fiber sensing technology .Its feature is that using the divide amplitude method to produce three equal intensity of CO2 laser beam, using reflecting mirror group to form the inter-120 degree intersecting beams in the plane, the intersection angle of three light beam can do fine adjustment to ensure that three beam intensity is balance. Each of the three light beams use cylindrical lens focus , made quartz capillary and fiber produce about 120 microns uniform circular welding in the fusion location. The use of laser pulse frequency is 20-24 KHz, through adjusting laser pulse parameters to control laser energy that exposure to quartz capillary. The effectiveness and benefits of the invention is the whole quartz structure of the non- Intrinsic fiber-Perot cavity fusion width and stress is uniform in the angle, bending small, reliable sealing. As the temperature / pressure sensor applications, it found minimal hysteretic error, it can achieve high measurement precision, and it has important value in the temperature, pressure and strain measurement of the harsh environment.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing. The invention relates to the manufacturing technology of the optical fiber method-Percavity sensor, in particular to a manufacturing method and device of an extrinsic optical fiber method-Percavity sensor. Background technique [0002] Fabry-Perot Interferometer (Fabry-Perot Interferometer) is referred to as Fabry-Pertin interferometer, also known as Fabry-Pert cavity, its basic structure is two precise optical reflection planes parallel to each other. The two reflection planes of the optical fiber method-Percavity sensor refer to the two interfaces with abrupt refractive index changes formed in the optical fiber. The two reflection planes of the extrinsic optical fiber method-Percavity sensor are two flat end faces of optical fibers perpendicular to the axis of the optical fiber. The flat end faces of the optical fiber are parallel to each other, and the air gap between the flat ...

AI Technical Summary

Problems solved by technology

The single-side high-frequency CO 2 The method of pulsed laser irradiation and thermal welding cannot guarantee the complete sealing of the quartz capillary and the optical fiber, and there are problems such as angular stress at the welding joint, uneven angular distribution of the width of the welding joint, and microbending of the sensor at the welding joint; literature " Self-Calibrated Interferometric / Intensity Based Fiber Optic Pressure Sensors" and the patent "A Method for Making Long-Period Fiber Bragg Gratings" use 120-degree mirrors to compensate for high-frequency CO 2 The method of laser thermal welding and fixing belongs to a three-beam light irradiation method of the sub-wave front. There is an angular stress distribution at the welding fixing point and an uneven angular distribution of the width of the solder joint. Large hysteresis error and other problems are prone to occur in pressure sensing

Images