浮子式光纤Bragg光栅密度传感器

Float-type density fiber Bragg grating sensor

针对传统浮子式玻璃密度计测量人为因素影响的缺点,实现了易燃易爆液体密度的本安测量。浮子式光纤Bragg光栅液体密度传感器全部浸没在被测液体中,液体密度导致浮子受浮力作用,等强度悬臂梁发生挠度变化,粘贴在悬臂梁上的光纤Bragg光栅的Bragg波长发生移位,通过与传感器连接的光谱分析仪,得到Bragg中心波长移位量,算出被测液体的密度。通过试验,Bragg波长的移位-密度量为传感器的灵敏度,为1.2pm/kg/m3,分辨率为0.83kg/m3/pm。测量范围:0.000kg/m3至2.459×103kg/m3。

The shortcoming of traditional float-type glass density meter is that human factors effect the measurement,in order to avoid this and achieve the safety measure of inflammable and explosive liquid density.When the float-type fiber Bragg grating liquid density sensor all immersed in the tested liquid,the liquid density leading to the buoyancy effect the float,then the deflection of uniform strength cantilever beam intensity changes,and then the Bragg wavelength of fiber Bragg grating which pasted in the uniform strength cantilever beam shift.Through connecting fiber Bragg grating with optical signal processing system,the density of the liquid is calculated by detecting the Bragg wavelength.According to the experiment,Bragg wavelength shift-density-value is 1.20pm/kg/m^3 also is the sensor＇s sensitivity too,the resolution is 0.83kg/m^3/pm.Measuring Range is：0.000kg/m^3-2.459×10^3kg / m^3.