Standing wave switching type sound stream micro-control screening device and working method thereof

Abstract

The invention discloses a standing wave switching type sound stream micro-control screening device and a working method thereof. The standing wave switching type sound stream micro-control screening device comprises a micro-control device, a fixing frame and a base. The micro-control device comprises a container and a piezoelectric ceramic module. The container is a hollow cuboid with an opening in the upper end and comprises first to fourth side plates and a bottom plate, and the centers of the outer walls of the first and third side plates are respectively provided with first and second clamping lugs parallel to the second side plate. The piezoelectric ceramic module comprises a first piezoelectric element group and a second piezoelectric element group which are arranged on the lower end surface of the bottom plate. The first clamping lug and the second clamping lug are fixed on a base through a fixing frame. Simple harmonic voltage signals are applied to the first piezoelectric element group and the second piezoelectric element group in turn, so that target objects with different diameters are separated and screened. By adopting the piezoelectric excitation micro-control device, lossless and non-contact control over a target object is achieved, and interaction between researchers and the target object is improved.

Description

technical field [0001] The invention relates to the field of micro-control and rapid screening of micro-particles, in particular to a standing wave switching type acoustic flow micro-control screening device and a working method thereof. Background technique [0002] In recent years, micromanipulations such as translation, rotation, alignment, sorting and separation of some particles or cells have become very common. There are many means of micro-manipulation, including light photography, dielectrophoresis, magnetic field, acoustic tweezers and so on. Among them, sound field manipulation has attracted widespread attention due to its high-precision drive, better biocompatibility, and non-contact manipulation. It is often used to achieve the classification, migration, rotation, and positioning of particles and cells. Vibration-driven micromanipulation devices, as a means of manipulating the orientation of micron-scale objects such as particles and cells, will have lower opera...

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Problems solved by technology

The defect is that the flow channel has a closed structure except for the inlet and outlet, so it is impossible to realize the interaction between the researcher and the target. Secondly, the size of the flow channel is related to the vibration frequency, resulting in a small size of the flow channel, which cannot realize the manipulation of a large number of targets. At the same time, micro-scale flow channels have higher requirements for processing

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