Optical fiber Fabry-Perot sensor and manufacture method therefore

Abstract

This invention relates to a good mechanical stability, high temperature resistant and good optical property optical fiber sensor, includes optical fiber and by-met optical fiber. optical fiber or / and by- met fiber optic end face have micro-flutes, and via butt joint together; The described micro-flute forms a FP cavity which has plain optical reflection surface. The invention adoptive laser machining craft can apply to every kind of optical fiber; be able to cutting optical fiber precisely, and are prone to execute different kinds of range's pressure sensor; optical property of the sensor is very fine; both the two stage optical fiber can be common single mode optical fiber, they are completely compatible; The contrast ratio of sensor's reflecting stripe can reach 10 dB upwards.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an optical fiber Farpert (FP) sensor and a manufacturing method thereof. technical background [0002] In recent years, with the rapid development of biology, medicine, energy, environment, aerospace, military and other fields, very urgent requirements have been put forward for the miniaturization, light weight, low energy consumption and harsh environment resistance of sensors. Micro-nano sensors It has become one of the major scientific and technological frontier hotspots in the world. The rapid development of laser microprocessing technology provides new technical means for the research of a new generation of micro-nano optical fiber sensor devices. Therefore, how to apply modern micro-nano processing technologies such as lasers to realize various micro-nano functional sensor devices on optical fibers is the key to the future development of optical fi...

AI Technical Summary

Problems solved by technology

[0004] In fiber optic sensors, the sensors for temperature, strain and pressure measurement are mainly fiber Bragg gratings (FBG) and FP cavity interferometers. FBG is widely used due to its temperature and other measured cross-sensitivity and spectral distortion under large strains. subject to greater restrictions

Due to the small cross-sensitivity between temperature and other measurands, the Fap sensor is very suitable for temperature, strain and pressure measurement, but the current structure of the optical fiber Fap sensor is shown in Figure 1, which uses a catheter 11 to connect two sections of optical fiber together , the mechanical stability is not good, and it is not resistant to high temperature. Its production mainly depends on manual production and packaging, and its yield and product repetition rate cannot be guaranteed.

[0005] JP2001280922 discloses a F-P sensor, which is only suitable for multi-mode optical fibers due to the use of corrosion technology, the sensor cavity must be multi-mode optical fibers, the production efficiency is low, and it is difficult to achieve large-scale manufacturing; Cutting, it is difficult to make a pressure sensor; an optical reflective surface of the Fap sensor is a corroded curved concave surface, and its reflection performance is not good, resulting in poor optical performance of the Fap sensor, and the contrast of the sensor reflection stripes is small (< 10dB), so that the measurement accuracy is limited; one end of the sensor is a multi-mode fiber, the sensor has a large insertion loss, poor optical performance, and the connection loss with the existing ordinary single-mode fiber is large, and it is difficult to reuse

[0006] WO2005121697 also discloses a F-P sensor, which is only suitable for multimode optical fibers due to the use of corrosion technology. It is also difficult to make a pressure sensor; an optical reflective surface of the Fap sensor is a corroded curved concave surface, and its reflection performance is not good, which also leads to poor optical performance of the Fap sensor, and the contrast of the sensor reflection stripes Small (<10dB), the measurement accuracy is limited; the sensor contains two solder joints, its mechanical properties are poor, the insertion loss is large, the reusability is also limited, and the optical performance is poor

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