Double-array correlation standing wave field ultrasonic suspension and control system and method based on FPGA

Abstract

The invention discloses a double-array correlation standing wave field ultrasonic suspension and control system and method based on an FPGA. The system comprises an upper supporting plate, a lower supporting plate, a plurality of ultrasonic transducers distributed on the upper supporting plate and the lower supporting plate, and a driving module used for driving the ultrasonic transducers. The driving module comprises a plurality of chips which are connected in parallel; the suspension method comprises the following steps of: s1, reversely solving the phase and duty ratio information of each ultrasonic transducer on two correlation ultrasonic transducer arrays at each moment of particle control by utilizing the characteristics, positions and motion parameters of suspended particles; and s2, calculating the phases and the duty ratios of all the ultrasonic transducers, and transmitting the phases and the duty ratios into software; and s3, through software, carrying out input design, timesequence constraint, analysis integration and board-level debugging on a time sequence circuit required by the ultrasonic phased array; according to the invention, operation control is carried out based on the time sequence circuit designed by the FPGA, so that the phase output delay error is greatly reduced.

Description

technical field [0001] The invention relates to the field of particle suspension, especially the suspension and three-dimensional space manipulation of non-contact micron-level objects. This proposes a new technology for the non-contact and pollution-free control of microbial cell bodies, droplet particles, biological compounds, etc. in the fields of bioengineering and medical treatment. Background technique [0002] Sound can levitate objects of different sizes and materials in air, water, and tissue. This allows us to manipulate cells, fluids, compounds or organisms without touching or contaminating them. However, acoustic levitation requires the target to be surrounded by acoustic elements or have limited mobility. Here, we optimized the phase used to drive the ultrasonic phased array, using two through-beam transmitters, and an FPGA-based sequential circuit to control the PWM wave signal, so that the acoustic levitation can be used for translation, rotation and manipul...

AI Technical Summary

Problems solved by technology

[0004] 1. Most of the control is based on the single-chip microcomputer. The single-chip microcomputer executes a single instruction sequentially to control the external ultrasonic transducer. When the ultrasonic array is large in scale, the delay error between the PWM wave signals is very large, which will directly affect the ultrasonic phased array. Precise control of particles by the suspension system and accurate and reliable dynamic response characteristics

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