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结合光纤光栅传感检测技术与旋涡分离原理,研制了一种基于三角柱型旋涡发生体的光纤Bragg光栅流量计,在三角柱旋涡发生体中部设置导压腔,腔内设置粘贴Bragg光栅的等强度悬臂梁,流体经过发生体两侧时,交替分离旋涡,导压腔内部产生脉动流体,等强度悬臂梁产生振动且振动频率与旋涡分离频率成正比,通过检测悬臂梁振动频率测量流体流量。实验表明,该流量计的线性度为4.38%FS,仪表系数为K=3.659,光纤光栅波长移位频率对流量的响应度为1.182Hz/(m3/h)。
A fiber Bragg grating flowmeter based on triangular-shaped vortex generator was developed based on the principle of fiber grating sensing and vortex separation. A pressure-guiding cavity was set in the middle of the triangular-shaped vortex generator. An isosceles cantilever When the beam and fluid pass both sides of the generating body, the vortex is alternately separated and the pulsating fluid is generated inside the pressure guiding cavity. The isostatic cantilever vibrates and the vibration frequency is proportional to the frequency of the vortex shedding. The fluid flow is measured by detecting the vibration frequency of the cantilever beam. Experiments show that the linearity of the flowmeter is 4.38% FS, the instrument factor is K = 3.659, and the responsivity of wavelength shift of fiber grating to flow rate is 1.182Hz / (m3 / h).