Design And Realization Of Multi-channel And High Precision Ultrasonic Instrument Used For Concrete Testing

The technology of ultrasonic nondestructive testing has been widely used because of its characteristics of good penetrability,harmless to people, widely used,great testing depth and low cost.Up to now, the ultrasonic instrument for concrete testing ,which widely used at home and abroad,has 8bit sampling digits and 20MHz sampling frequency,and collects data from one channel or double channels.At the same time,the testing method has been based on one-dimension signals, from which it is hard to get a clear description on the concrete structures. So a new ultrasonic testing system has been developed,which is suitable for new designed rare earth GMM transducer.The main purpose of this paper is to the design and realization of the ultrasonic instrument used for concrete testing.Based on analysing the structure of ultrasonic testing system,the paper brings forward a new networked ultrasonic system used for concrete testing.and discusses its functions and capability targets. The core of the new instrument is composed of network processor and CPLD.The functions of network transmission and data acquisition are finished by network processor,and the function of signal processing is completed by peripheral circuit.Data acquisition, signal processing and network transmission can be processed simultaneously.Besides, the logical connection and emluator among functional modules of hardware platform is finished by CPLD IDE,and the communications software is implemented by IP2022 IDE.At last,Experimental result shows that this system can reach the required standard,and the ability to resist disturbance is strong. So it can be used for the concrete construction safety supervision and quality evaluation.