Research On The Preparation And Mechanism Of Combined Optical Fiber Interferometer

With the progress and development of social science and technology,the acquisition of information has become particularly important.Of course,sensors are essential devices for obtaining information.The traditional electrical sensor technology performs sensing by converting the input signal into an electrical signal,but such a sensing method is not only susceptible to external factors,but also has the shortcomings of short transmission distance and short service life.In recent years,due to its high sensitivity,chemical resistance,low electromagnetic interference,high reusability,small size,and light weight,optical fiber sensors have attracted wide attention.However,in order to achieve accurate local sensing sensitivity measurement,it is necessary to reduce the size of the optical fiber sensor without affecting the sensing sensitivity.In order to achieve this goal,this paper designed a special manufacturing device,using this new device to prepare a variety of new types of optical fiber sensors and research their corresponding sensing characteristics.Firstly,how to operate simulation software,and use this software to build single mode-no core-single(SNS)models of different lengths.By observing the transmission spectrum,we found that the interference fringes gradually become denser as the length of the no core fiber(NCF)increases.The experimental system used to prepare the combined optical fiber interferometer is introduced in detail,and this system is used to make SNS optical fiber structures of various sizes.This manufacturing method is simple and does not damage the optical fiber,can excite high-order modes in a short length,and realize the research of the sensing characteristics of various physical parameters.Secondly,we propose an all-fiber structure(ME-SNS for short)in which multimode fiber(MMF)is periodically embedded in SNS.We have studied the ME-SNS fiber structure in theoretical simulation,and studied the design and peaking mechanism of this structure.Through experimental research on the refractive index response of the ME-SNS fiber structure,the refractive index sensitivity of the ME-SNS fiber structure is much higher than that of the SNS fiber structure of the same length.At the same time,it was found in the temperature test that its temperature response was low.It has been proved through many experiments that the ME-SNS fiber structure has the advantages of high sensitivity,low cost,high integration,etc.,and has a wide range of application values.Finally,this paper proposes a miniature sensor based on periodic splicing(MCI)of two multimode fibers.Use the splicing and cutting process mentioned in this article to ensure good mechanical properties of the structure.The non-working area of the traditional interferometer is generally a single-mode fiber,and this structure uses a multi-mode fiber to replace the single-mode fiber in the non-working area to reduce the size of the sensor.This structure can be used to measure strain,temperature,RI and bending sensitivity.The MCI structure has the advantages of compact structure and low cost,and has potential application prospects in sensing characteristic measurement.This subject is based on the theory of multi-mode interference,and the micro-sensor produced by the experimental system of the combined optical fiber interferometer proposed in this paper has the advantages of high integration,high sensitivity,and low cost.At the same time,this system can also be used for the production of various combined fiber optic sensors.This subject has certain reference significance for the development and research of optical fiber sensors.