3results about How to "Improved Axial Resolution" patented technology

The application belongs to the technical field of optical precision measurement, and discloses a sample height acquisition method and system based on line spectrum confocal profilometry. The method comprises the following steps: S1, collecting multiple gray images of the surface profile of a sample to be measured, calculating the similarity between the gray images of adjacent sampling times and dividing the gray images into multiple groups; S2, performing Gaussian blur mean value processing and Gaussian cut-off on each group of images to obtain Gaussian-processed images, and then performing preprocessing on the Gaussian-processed images to obtain the position coordinates of the pixel points corresponding to the maximum gray value; S3, acquiring the sample height corresponding to the maximum gray value, and obtaining the sample height profile corresponding to the group of images from the sample heights corresponding to all columns; and S4, repeating steps S2 and S3 to obtain the sample height profiles corresponding to all groups of images, thereby obtaining the sample height profiles of the surface profile of the sample to be measured at different positions. Through the application, the problem of low sample height detection precision is solved.

The present application relates to the field of optical microscopic imaging technology, and provides a three-dimensional differential phase contrast refractive index tomographic reconstruction method, system, device and program, the method comprising: collecting multi-mode intensity data; the multi-mode intensity comprises a three-dimensional intensity image stack and a focus and defocus angle change intensity set; determining a transfer function according to the three-dimensional intensity image stack, and obtaining an initial scattering potential spectrum by using a deconvolution algorithm; based on the focus and defocus angle change intensity set, performing a loop single LED intensity constraint update on the initial scattering potential spectrum to obtain a scattering potential estimate; using the three-dimensional intensity image stack, performing a linear gradient constraint update on the scattering potential estimate, and executing the linear gradient constraint update cyclically until a convergence condition is met, performing a three-dimensional inverse Fourier transform according to the final obtained scattering potential spectrum, and outputting a three-dimensional refractive index distribution result. The present application substantially improves the accuracy and quality of three-dimensional refractive index reconstruction while keeping the advantages of non-interference and label-free imaging and the simplicity of system hardware.

The invention discloses an ultrahigh-frequency ultrasonic transducer capable of generating quasi-unipolar pulses, and belongs to the technical field of ultrasonic transducers. The transducer comprises a backing layer, a high-frequency piezoelectric layer and a combined layer which are sequentially arranged from bottom to top. The combined layer comprises an acoustic decoupling layer, a first high-frequency matching layer, a second high-frequency matching layer, an ultrahigh-frequency piezoelectric layer, an ultrahigh-frequency polymer matching layer and an ultrahigh-frequency metal matching layer. A penetrating cavity is arranged between the first high-frequency matching layer and the second high-frequency matching layer, and an acoustic decoupling layer, an ultrahigh-frequency piezoelectric layer, an ultrahigh-frequency polymer matching layer and an ultrahigh-frequency metal matching layer are sequentially arranged in the penetrating cavity in a stacked mode. During working, the high-frequency piezoelectric layer and the ultrahigh-frequency piezoelectric layer can be driven to generate forward waves of high-frequency ultrasonic waves and ultrahigh-frequency ultrasonic waves respectively by reasonably adjusting electric excitation parameters, and the forward waves of the high-frequency ultrasonic waves and the ultrahigh-frequency ultrasonic waves are superposed, so that quasi-unipolar pulses with sharp main lobes and low side lobe levels are synthesized. The problem of pulse trailing of the ultrahigh frequency transducer is effectively solved, the axial resolution is remarkably improved, and meanwhile high detection sensitivity is kept.