High-sensitivity acceleration measurement method and sensor based on optical fiber optical tweezers

Abstract

The invention discloses a high-sensitivity acceleration measurement method and sensor based on optical fiber optical tweezers, and the method comprises the steps: applying a certain fluid traction force to a polystyrene microsphere captured by the optical tweezers, measuring the displacement of the polystyrene microsphere through a four-quadrant photoelectric detector, and calibrating the relation between the displacement of the microsphere and the light receiving force; when the microsphere is placed in an acceleration environment, the light force corresponding to the deviation displacement caused by the environment acceleration is obtained according to the relation between the displacement of the calibrated microsphere and the light receiving force, and then the light force is divided by the mass of the microsphere, so that the environment acceleration is obtained. According to the invention, the micro-sphere in the micro-fluidic channel is stably captured in a non-contact manner by using the optical fiber optical tweezers technology and the micro-fluidic technology, and the appropriate conical optical fiber is selected based on time domain finite difference numerical calculation, so that the micro, high-sensitivity, high-precision and low-cost measurement of the acceleration of the micro-sphere is realized.

Description

technical field [0001] The invention belongs to the technical field of acceleration measurement, and in particular relates to a high-sensitivity acceleration measurement method and sensor based on optical fiber optical tweezers. Background technique [0002] Light has energy and momentum. Classical optics mainly focuses on electromagnetic radiation itself, while the development of modern optics focuses on the interaction between light and matter. The invention of the laser in the 1960s also enabled the advent of optical tweezers. The practical application of optical tweezers in modern times is mostly used for actively manipulating particles, capturing tiny particles, measuring tiny forces and tiny devices. Optical tweezers technology utilizes the radiation pressure effect of lasers to achieve non-contact, non-damaging and precise manipulation of tiny particles (sub-micron to tens of microns in size) in a three-dimensional potential well formed by a highly focused laser beam...

AI Technical Summary

Problems solved by technology

[0004] In the past, scientists used complex optical path structures to measure the acceleration of atoms based on the action of light, which made it difficult to miniaturize and reduce the cost of the sensor.

And when detecting the acceleration of the atom, it is often difficult to accurately measure the acceleration caused by the unbalanced force on the atom due to the mass and volume of the atom.

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