A Data Acquisition System for Monitoring the Physical Phenomena of Highway Bridges in Service

摘要

The system is used for gathering and recording information from specific points on bridges necessary to complete the test objective. The system input section will accommodate 15 channels of low level transducer analog information. The conditioned low-level analog signals are presented to 15 wide-band differential amplifiers for amplification and selective filtering. The digital processing section accepts information from the acquisition section and converts it to a form suitable for entry to the special purpose stored program data processor. The output section contains the printer and/or paper tape punch. This device, with an on-line data path to the stored program data processor, and the stored program data processor with an on-line control path back to the digital processor, allows the stored program data processor to monitor data and control processing parameters with great flexibility and efficiency. Digital data from 10 primary input channels is monitored for cyclic variations by 10 programmed data registers and storing in counters the accumulated numbers of occurrences of each level. Alternate modes of incremental level discrimination are processed by the stored program data processor. The preselected levels may be prescribed as a certain percentage of the full-scale value. The program will then convert this percentage to the appropriate number of counts and retain it for use by the subsequent program and for recording on paper tape. (Author)