|
In recent years, a growing proportion of the construction industry in the national economy, but the quality of the construction work has been a hot consumer complaints. Concrete quality is directly related to the quality of the construction work, therefore, is very meaningful to explore the non-destructive testing of concrete. This project comes from the design of the actual number of projects in the rebound system. Concrete quality testing requirements for existing resiliometer low accuracy, high prices, slow drawback, design digital rebound system. Rebound design digital data processing system to meet national standards rebound method for testing concrete compressive strength Statutes, to guarantee they measured the accuracy of the data, and the rebound National versatility. The specific design work, including both hardware and software parts. (1) is designed on the basis of the analysis of the large demand digital springback system, which is composed by the sensor and the detection circuit, springback system host. Due to the current market is not able to meet the system performance of the sensor, it developed its own optical displacement sensor based of IR908, PT2559B and grating sensor measurement circuit with low price, high-performance serial 8 switched capacitor successive approximation type A / D chip TLC749; rebound system host chip uses P89V51RD2, designed keyboard, LCD, memory, USB port and serial port circuitry. According to the test results, to achieve the purpose of communication with the host computer to the USB port or serial port. Optical displacement sensor automatically rebound value acquisition, digital rebound speed of the system and the sampling accuracy. (2) in Keil uVision3 environment, using the C language the rebound system host the main program, the drivers of each module and communicate with the host computer program, to achieve real-time data processing functions. Between the measured amount of data, usually require a batch using Visual C development of the PC software, the software can also save or print test results to achieve the purpose. After system design, the rebound system host and the host computer functions, communications test, the results show that the system performance, faster to meet the needs of the project. Currently, the system is about to put into the market. Advantage of it to reduce production costs, improve efficiency, a practical, reliable, durable, small size, and accurate detection of concrete play a supervisory role, to some extent, promote the rapid development of the construction industry.
|