Recently with the invention of fiber optic Bragg grating (FBG), new kind of sensors based on FBG is increasingly challengingly the dominating position of some traditional sensors, because this new device has some intrinsic capability: Such as multiplexing, self- referencing, optical and mechanical reliability, anti-interference. Especially it brings the significant advantages that they are non- conductive and lightweight, which can allow for much simpler insulation and mounting designs as the application voltage up to 1000kV or more to day. In addition, it doesn't exhibit hysteresis and provide a much large dynamic range and frequency response than iron- core conventional current transformer (CT). In this paper a current sense device based on electromagnetic force is presented. A FBG is held on the armature of an electromagnetism by one end. As current pass through the iron coil, the magnetic force of the coil lengthens the FBG. Then the Bragg wavelength will change via current. By measuring the change of Bragg wavelength of the FBG we can build a relationship between the tested current and the Bragg wavelength. In this paper the configuration of the new device, the theoretical analysis and measurement results are given.
An automatic cash-binding machine register system for paper currency numbers is developed in this paper. The paper currency number is recognized and recorded by the system during binding. It can be used as an assistant method for investigation cases of bank highjack and false paper currency. The hardware of the system is composed of money-binding machine, camera, lamp-house, image gather-card and computer. To improve recognition speed, the area of number image is decreased by adjust the camera’s location on the binder. A size of 200×40 pixel is chosen in the system. The software of the system is made up of number image sample, segmentation of gray ridge-vale algorithm, orientation of projection, recognition of structure-analyzing algorithm and record. Factors as follows: the software run-speed, illumination uniformity the fray and smutch in the paper currency are considered. A random experiment with two hundred sheets of RMB 100 Yuan is given. The recognition ratio is 98%, and the average time for one sheet is about 30ms in the experiment. It can content the speed demand of binder binding money. The system has been applied national patent.