better Nondestructive Evaluation for contemporary complex industrial
equipments.
Throughout the ultrasonic phased array system, the delay focusing
algorithm is the key to improve the accuracy of the amount of delay can
improve overall system accuracy. This issue through ultrasonic phased
array technology for the delay subdivision law studies, and ultimately
implement two delay mode, the coarse delay and fine delay. Coarse delay
is the transmitted pulse duration of the high level the control module
can only be delayed by an integer multiple of the clock cycle; the fine
delay of the delay module, we can control the multi-phase clock frequency,
can ultimately increase the delay module achievable accuracy. Enhanced
FPGA integrated PLL can achieve multi-phase clock signals, using the
multi-phase clock signals, we can improve the accuracy of the delay
amount. This design is based on the FPGA platform, cleverly integrated
with enhanced FPGA internal PLL to achieve delay subdivision algorithm
hardware circuit.In modelsim to verify the results on the design. Master
platform is completed scan mode sector scan, complete phased array focal
law, the final output sixteen channel trigger pulse delay data. According
to their actual requirements, users can manually select the coarse or
fine delay time.
This paper mainly discusses about several modules: algorithm module,
scanning module, the delay module, the beam forming module. In the
algorithm module, we use the advantage of running speed FPGA to achieve
binary root operation, the traditional binary root operation using the
iterative algorithm, making the whole algorithm implementation process
becomes relatively long. This topic simulate the process of binary
prescribing hand count, using FPGA internal multiplier hardcore achieve
binary root operation.
Throughout the project design process, we use internal FPGA
