【正文】 t gathering area。本文對兩類傳感器的工作原理和特點進行了詳細分析，并介紹在互聯(lián)網(wǎng)安全認證、汽車無鑰匙進入系統(tǒng)等的應(yīng)用。 人類的指紋由緊密相鄰的凹凸紋路構(gòu)成，通過對每個像素點上利用標準參考放電電流，便可檢測到指紋的紋路狀況。這種傳感器易于使用，并可將整個指紋圖像以 500dpi(自動指紋識別標準 )的精度進行快速傳輸。劃擦型傳感器的優(yōu)點是尺寸小 (如富士通的MBF300尺寸僅為 mm2)和成本低。如果不是授權(quán)用戶，手機便繼續(xù)保持鎖住。指紋模板和匹配軟件保存在汽車內(nèi)的一個嵌入式模塊中。 當(dāng)用戶進入系統(tǒng)時，他 /她將手指劃過傳感器區(qū)域，所獲取的現(xiàn)場掃描模板與參考模板進行比較。 通過比較，系統(tǒng)會確定這一現(xiàn)場掃描模板是否包含了與參考模板相符的足夠生物數(shù)據(jù)，并判斷二者是否匹配。此外，還可控制駕駛速度，如果駕駛者僅為十來歲的孩子，則將速度限制在每小時 55公里。 在語音郵件的應(yīng)用中，當(dāng)撥出一個語音郵件號碼后，用戶只需將手指劃過傳感器便可令系統(tǒng)識別。精密的圖像重建軟件以接近 2021幀 /秒的速度快速地從傳 感器上采集多個圖像，并將每個幀的數(shù)據(jù)細節(jié)組織到一起。不久的將來還將逐漸用于汽車單觸式無鑰匙進入系統(tǒng)，以及新興的國家安全應(yīng)用中。電容陽極上電壓的改變率與其上的電容成下面的比例關(guān)系： Iref=C dv/dt 處于指紋的凸起下的像素 (電容量高 )放電較慢，而處于指紋的凹處下的像素 (電容量低 )放電較快。這兩類指紋傳感器將得到越來越廣泛的應(yīng)用。s fingerprint by the close neighboring concaveconvex 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 electric discharge. On under the electric capacity anode the voltage change rate if on electric capacity bees 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 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 may form the extremely good primitive fingerprint image. Process shows which through chart 1, uses the plex 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 detail template, then carries on the test, determined withdraws whether the detail template does tally with the reference template. 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 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 have pleted 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