The Bridges had collapsed accidents in recent years due to bridges quality problems. Therefore, concretes nondestructive testing are particularly important. At present, most applications are Ground Penetrating Radar (GPR) technology in the detection of reinforced concretes structure. GPR are used the pulse method which alongside with definitive advantages, but the testing of the internal structure of the small thickness concretes has very low resolution by this method. In this paper, it’s the first time to use the ultra-wideband (UWB) stepped frequency conversion radar above problems. We use vector network analyzer and double ridged horn antenna microwave imaging system to test the reinforced concretes block. The internal structure of the concretes is reconstructed with a method of synthetic aperture of ω-k algorithm. By this method, the depth of the steel bar with the diameter of 1cm is shown exactly in the depth of 450mm×400mm×500mm and the depth error do not exceed 1cm.
The grating digital readout is the key measurement feedback device of the numerical control system and base of the
equipment manufacturing industry. With the development of the complex machining, the multi-axis linkage is a new
direction of the numerical control system, which needs the multidimensional measurement. Based on all digital grating
moiré fringe subdivision theory, the paper introduces the design of integrated and networked multidimensional grating
digital readout with an embedded system-on-chip ZA7V that is a complete field configurable system-on-chip with a 32-
bit ARM7TDMI processor core, a programmable logic matrix, a robust memory subsystem and a high-performance
dedicated internal bus. Networked functions include Ethernet interface, CAN bus interface, USB bus interface and GPRS
interface so that the grating digital readout can access the device network, workshop network, intranet network and
Internet. The simulation results and experimental data prove that the realization of the integrated and networked
multidimensional grating digital readout. It will be widely used in the numerical control system and machining center.