Design Of High-frequency Photoacoustic Signal Comprehensive Processing Model Based On Metamaterial Structure

Early detection of malignant tumor cell has an important impact on the development of modern medicine.With its unique advantages,photoacoustic detection technology plays an important role in the early detection of malignant tumor cells.Due to the characteristics of the cell photoacoustic detection technology,the acoustic signal generated by the cell is at high frequency or ultra high frequency.This type of acoustic wave signal has serious transmission loss problems.And because the volume of the cell itself is too small,the generated sound pressure is extremely low,and there are a lot of clutter signals in it.The existence of the above factors determines the difficulty of acquiring acoustic signals in photoacoustic detection of cells.In order to promote the development of cell photoacoustic detection technology,this paper uses the finite element analysis method and the COMSOL software to design the graphene-like structure transmission belt and acoustic triode model for acoustic metamaterial structure technology,and conducts simulation experiments.Experiments show that the graphene-like structure transmission belt has good directional transmission of sound waves and the ability to enhance the local sound field of high-frequency sound wave.The acoustic triode model has a good ability to enhance the high frequency acoustic local sound field and filter out clutter.At the same time,according to the characteristics of UHF acoustic signal,a new type of rotating body structure is designed to replace traditional acoustic metamaterial.The experiment proves that the rotating body structure designed in this subject has a good local sound field enhancement ability for UHF sound waves.These studies are of great significance to improve the signal efficiency of cell photoacoustic detection and promote the development of cell photoacoustic detection applications.