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 recogn
2、ition 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 inf
3、ormation 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 h
4、as two 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 spec
5、ific 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 elemen
6、t electrode, 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 tha
7、n 500dpi 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 silico
8、n by 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 cl
9、ose 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 e
10、lectric discharge. On under the electric capacity anode the voltage change rate if on electric capacity becomes the proportional relationship: Iref=Cdv/D Is in the fingerprint under the bulge picture element (electric capacity high) to discharge slowly, but is in the fingerprint under the depression
11、 picture 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
12、 may 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
13、 detail 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
14、contact 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 ha
15、ve completed 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 sen
16、sor 300 (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 extre
17、mely. Has a deactivated level in the component surface, takes two electric capacities interelectrodes the dielectric sheet. Puts in on the sensor when the finger, in the fingerprint bulge and the indentation can have the different capacitance value in the array, and the constitution uses in an entir
18、e image which authenticates. Delimits the scratching sensor is one kind of new fingerprint gathering component, the request user has delimited the finger on the component. Delimits the scratching sensor the merit is the size small (for example Fujitsus MBF300 size only is 3.613.3 mm2) and the cost i
19、s low. These components mainly use in the mobile equipment inserting the type safe recognition application, like handset and PDA. The precise image reconstruction software by approaches 2,000/A second speed fast gathers many images from the sensor, and organizes each frame data detail to together. 3.Information and authentication The portable low cost fingerprint recognition technology is without a doubt profound to our life significance. For example, the next police might succeed in the imperial civil service
