针对现有超声检测系统校准装置频带较窄、便携性差、现场操作不便等问题，通过对超声检测系统校准技术的原理、方法与标准等进行分析研究，采用现场可编程门电路（FPGA），利用DDS（直接数字频率合成）技术形成正弦信号发生器，并通过集成数字衰减器，研制出了频率范围更广、频率精度更高、体积更小、质量更轻、集成度更高的超声检测系统校准装置。通过与国内同类设备校准结果的比较，表明该新型校准装置完全满足相关计量规程、校准规范和标准的要求，与国内同类设备的校准水平相当，并更适用于工业现场大型超声检测系统的校准。

Aiming to solve problems faced by existing calibration devices for ultrasonic testing systems, such as narrow frequency band, poor portability and inconvenient on-site operation, analysis and research on the principles, methods, and standards of calibration techniques for ultrasonic testing systems were then undertaken. As a result, field programmable gates (FPGA) were used to forms a sinusoidal signal generator with DDS (direct digital frequency synthesis) technology, and by integrating a digital attenuator, an ultrasonic detection system with a wider frequency range, higher frequency accuracy, smaller volume, lighter weight, and higher integration has been developed. Through comparative research with the calibration results of similar domestic equipment, the calibration results of the new calibration device fully meet the requirements of relevant measurement regulations, calibration specifications and standards, which are comparable to the calibration level of similar domestic equipment, and are more suitable for large-scale ultrasonic inspection systems on industrial sites calibration.