Ultrasonic phased array beam delay method for FIR (Finite Impulse Response) multi-phase interpolation filtering

Abstract

The invention discloses an ultrasonic phased array beam delay method for FIR (Finite Impulse Response) multi-phase interpolation filtering. The ultrasonic phased array beam delay method comprises the following steps: exciting a multi-array element probe according to a focusing method, and conducting receiving and delay focusing on reflected waves; carrying out echo up-sampling to improve the sampling rate from fs to I.fs, and carrying out I-path decomposition to obtain the delay precision of two adjacent paths 1 / (I.fs); filtering out high-frequency components via anti-mirror filtering with an FIR multi-phase interpolation filter. Based on the accurate sequential control of FPGA and fast parallel processing capability, and the combination of the digital signal processing technology, an up-sampling zero insertion technology is provided, filtering is carried out after I-time zero insertion is conducted on signals, and the high-frequency components are filtered out via anti-mirror filtering with the FIR multi-phase interpolation filter, so that the ultrasonic echo sampling rate is improved from fs to I.fs; meanwhile, I-path decomposition is carried out, so as to form the delay precision of the two adjacent paths 1 / (I.fs).

Description

technical field [0001] The invention relates to an FIR multiphase interpolation filtering ultrasonic phased array beam delay method. Background technique [0002] Ultrasonic phased array technology controls the high-voltage excitation phase delay of each array element in the ultrasonic array transducer, and then delays and focuses the reflected waves received by multiple array elements to obtain a flexible and controllable synthetic beam and focus point position The random control of the sound beam can be realized by arbitrary deflection of the workpiece to scan all directions of the workpiece, so as to realize dynamic focusing, high-speed scanning, sector scanning, and detection of objects with complex shapes, etc., which need to be guaranteed by precise time delay technology. hotspot. Among them, the realization of precise focus delay is the core and difficulty of various focusing algorithms of ultrasonic phased arrays, and precise delay methods such as hardware line dela...

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Problems solved by technology

Among them, the realization of precise focus delay is the core and difficulty of various focusing algorithms of ultrasonic phased arrays, and precise delay methods such as hardware line delay, sampling delay, dedicated chip delay, and software delay are formed, but their versatility is poor , high cost, and difficult modification and control; software delay is a method to achieve precise delay with the help of flexible digital signal processing algorithms, which has the characteristics of strong versatility and good portability, but the algorithm is relatively complicated, and the implementation methods and techniques have always been people research hotspot

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