Method and device for measuring dynamic viscosity based on light suspended particles

Abstract

The invention discloses a method and device for measuring dynamic viscosity based on light suspended particles. The method comprises stably capturing particles in a sample to be tested through a capturing beam, applying a modulated beam to the particles in the trapping well, regulating the optical power of the modulated beam by an excitation signal so that the particles carry out response motion after the action of the modulated beam on the particles, acquiring a real-time motion curve of the particles through detecting the optical power change of the scattered light of the captured beam, andcarrying out parameter fitting on the motion curve to obtain resonance frequency and viscous damping so that the dynamic viscosity of the sample to be detected is obtained. The device comprises a sample module, a capture optical trap module, an excitation modulation module and a motion detection module. The method adopts the optical non-contact method to measure the dynamic viscosity of the sample, has a high measurement precision and a fast response speed, and can dynamically detect the dynamic viscosity change of the sample under different temperature and pressure conditions in real time.

Description

technical field [0001] The invention relates to an optical trap measuring device applied in the field of optical engineering, in particular to an optical trap measuring device and a measuring method thereof for precision measurement by using optical suspension. Background technique [0002] Dynamic viscosity is one of the important material properties and technical indicators of fluid. The accurate determination of dynamic viscosity is of great significance in many industrial sectors and scientific research fields, especially in chemical industry, refrigeration, energy and materials industries. For the measurement of low-viscosity fluids, the capillary method, torsional vibration method, falling ball method, rotating cylinder method, etc. are usually used. These methods are difficult to obtain accurate values ​​under high pressure conditions, and it is also difficult to measure the viscosity of gases, the measurement range is narrow, and the measurement accuracy is low. ...

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Problems solved by technology

However, this method is only suitable for the detection of liquid samples, and requires accurate ca

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