Figure 2. The response of a resonant filter-fiber (3 μm wide, 138 μm long, and 220 nm thick silicon nitride fiber coated with a layer of 50 nm Al) to 28.0 ± 3.2 nm silica nanoparticles with a concentration of 3 × 106 ± 1 × 106 particles/cm3.
(a) Frequency slope of the fiber resonance for different aerosol velocities from 1.05 to 52.5 m/s. The red line represent the fit with equation (2). (b) Frequency trend for the lowest and highest air velocity.