Study And Application Of Optical Fiber Based On A Fiber Microfludic Velcocity

In the paper,the main research content is microfluidic velocity fiber measurement technology study and application.Mainly do a study and discussion on the two style of microfluidic velocity measurement sensor structure.The main contents are shown as following:1.The microfluidic velocity measurement sensor based on fiber Sagnac is proposed and realized.The system consists of a polarization maintaining fiber to form a fiber Sagnac.Among this,the capillary is used to simulate the narrow space required for the experiment.When the microfluidic velocity changes,the side pressure on the polarization maintaining fiber will change,which causes wavelength shift of the optical fiber Sagnac loop.And the measurement of the microfluidic velocity can be realized by monitoring the wavelength shift of the output interference spectrum of the fiber Sagnac loop.2.The microfluidic velocity and temperature measurement sensor based on FBG embedded fiber Sagnac loop is proposed and realized,and the simultaneous measurement of microfluidic velocity and temperature is realized.The system consists of a polarization maintaining fiber,cascaded a FBG(gate length of 25mm)to form fiber Sagnac loop.When the microfluidic velocity and temperature change at the same time,the two variables do not affect each other.The response of the sensor to the microfluidic velocity is measured experimentally.Compared to other microfluidic velocity measurement of the sensor system,this program proposed microfluidic velocity sensor measurement range expanded.3.The two fiber Sagnac loops are composed of two fiber Sagnac rings and 1.44 m and 1.5m,respectively.When the velocity increases from 50 μm/min to 500 μm/min,the transmission spectrum of cascaded fiber Sagnac loops shifted from 1533.36 nm to1525.36 nm,microfluidic velocity sensitivity is 25.46 pm/(μm/min).Compared with the single fiber Sagnac loop measuring the sensitivity of microfluidic velocity was increased by about 3 times.4.A microfluidic velocity sensor based on fiber optic F-P cavity is proposed and the system is composed of optical fiber adapter,single mode fiber and polyethylene film.The sensor realizes the measurement of microfluidic and probes into the influence of fiber F-P cavity length on the sensitivity of microfluidic.