Actual Sensing Sensitivity and SNR Measurement of Optical Tweezers Based on Coulomb Force Input

Abstract Sensing sensitivity is the key performance of optical tweezers. By adjusting frequency and magnitude an applied Coulomb force as input tweezers, we directly measured signal-to-noise ratio (SNR) a system indirectly calculated actual noise magnitude. Combined with output filter, relationship between SNR bandwidths was studied. We established simulation model using Simulink simulated forces filter bandwidths. In addition, built experimental to determine The minimum detectable 1.8275×10 −17 N at 1 Hz bandwidth. results were correlated theoretical results, confirming effectiveness proposed method demonstrating high vacuum tweezers mechanical sensors. novel calibration measurement sensing parameters by applying that more direct precise than calculation requires accurate fitting parameters, such particle radius density. This can be employed analyze phase characteristics confirm improve real system.