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1、4050字数外文翻译New fingerprint identification sensor applications analysis Abdtract Fingerprint recognition technology as a sophisticated identification methods have been widely used in various industries. The core components of the technology used for sensors, the paper introduced fingerprint recognitio
2、n technology sensors in the application. Keywords Fingerprint identification Sensors Applications Contact type the sensor with delimits the scratching sensor is two kind of new solid states fingerprints sensor, all is through in touches in the process the electric capacity change to carry on informa
3、tion gathering. This article has carried on the multianalysis to two kind of sensors principles of work and the characteristic, and the introduction in the Internet safe authentication, the automobile does not have the key to enter the system and so on the application. At present in the market has t
4、wo kind of solid states fingerprints sensor: The first kind is the single time of touching sensor, requests the finger to carry on reliable touching in the fingerprint gathering area; The second kind then needs to use the finger to scratch in the sensor surface, the sensor can gather set of specific
5、 data, then carries on the fast analysis and the authentication. These two kind of fingerprints sensor will obtain the more and more widespread application. The above two kind of sensors principle of work is: When in the fingerprint bulge partially puts in on the electric capacity picture element el
6、ectrode, the electric capacity can have the increase, increases the electric capacity through the examination to carry on the data acquisition. In the sensor picture picture element is 45 squares microns, the gap is 50 microns, the electric capacity picture element array resolution is higher than 50
7、0dpi slightly. This kind of sensor based on one kind of standard list - polycrystalline silicon three metals CMOS craft, and uses 0.5 microns craft to carry on the design. The metal interlocks the third constitution electric capacity picture element level, is made and is covering nitrided silicon by
8、 the titanium nitrides, thickness is only 7,000 Emmy. This kind of rigid metal electrode with anti- rubs extremely solid spreads the sensor which the coating combination forms to be durable, the service life may amount to very many years. 1.Fingerprint examination Humanitys fingerprint by the close
9、neighboring concave-convex trace constitution, through lights the use standard reference discharging current to each picture element, then may examine to the fingerprint trace condition. Each picture element in advance charges first to some reference voltage, then by reference electric current elect
10、ric discharge. On under the electric capacity anode the voltage change rate if on electric capacity becomes the proportional relationship: Iref=Cdv/DIs in the fingerprint under the bulge picture element (electric capacity high) to discharge slowly, but is in the fingerprint under the depression pict
11、ure element (electric capacity to be low) discharges quickly. This kind of different discharge ratio may maintain (S/ through the samplingH) the electric circuit examines and transforms 8 outputs, this examination method has the high sensitivity to the fingerprint bulge and the indentation, and may
12、form the extremely good primitive fingerprint image. Process shows which through chart 1, uses the complex software algorithm to be possible to carry on the fingerprint recognition. This kind of software gathering primitive fingerprint image, and withdraws the pictorial information digitization deta
13、il template, then carries on the test, determined withdraws whether the detail template does tally with the reference template. 2.Compared with process Contact type the sensor with delimits the scratching sensor the size and the cost is all dissimilar. The contact pilot is big, usual effective conta
14、ct face for 1515mm, but rapidly gathers the biggest fingerprint or the thumb fingerprint. This kind of sensor is easy to use, and may the entire fingerprint image by 500dpi (automatic fingerprint recognition standard) the precision carries on the speedy transmission. At present these sensors have co
15、mpleted the design, and uses in the US government apparatus and the police station carries on the fingerprint recognition. Near future also gradually will use in automobile Shan Chushi not having the key to enter the system, as well as in emerging national security application. This kind of sensor 3
16、00 (line) the miniature metal electrode is composed by 256 (row), each row connects to pair of S/On H electric circuit. Fingerprint image succession by a line of gathering, each metal electrode takes the electric capacity extremely, with it contact finger then is electric capacity another extremely. Has a deactivated level in the component surface, takes two electric capacities interelectrodes the dielectric sheet. Puts in on the sensor when the
