紅外發(fā)光二極管維護(hù)守夜

　　在當(dāng)今日益安全意識(shí)的世界，閉路電視攝像機(jī)市場(chǎng)正在繼續(xù)擴(kuò)大全球。先進(jìn)的IP視頻等技術(shù)正在推動(dòng)網(wǎng)絡(luò)系統(tǒng)和物聯(lián)網(wǎng)的增長(zhǎng)。優(yōu)越的壓縮標(biāo)準(zhǔn)和更快的圖像處理正在擴(kuò)大應(yīng)用潛力。無論是用于訪問控制，入侵警報(bào)或一般犯罪預(yù)防，半公開或隱蔽的方式，在室內(nèi)或室外，央視廣泛應(yīng)用在消費(fèi)/私營(yíng)部門，零售和工業(yè)廠房，在公共、民用和軍事應(yīng)用的公民和政府大樓。

　　當(dāng)涉及夜視和低光照水平時(shí)，紅外發(fā)光二極管是關(guān)鍵部件。例如，紅外LED照明模塊是當(dāng)今大多數(shù)閉路電視系統(tǒng)的重要組成部分，通常結(jié)合了先進(jìn)的圖像增強(qiáng)和控制電子功能。重要的是，現(xiàn)代紅外發(fā)光二極管技術(shù)更先進(jìn)，更可靠和更持久的持久性比早期世代。

　　This article will consider the selection criteria and design constraints for IR LEDs when used in CCTV camera systems， particularly for applications such as access control. The range required， for example， can be from just a few meters to 100 meters or more. High power devices deliver increased optical output， and a wide range of emission angles is available. The specific application will determine the combination of parameters required in IR LEDs. For example， far reaching illumination requires high power and a narrow cone; wide-angle devices are better suited to near-field visibility applications.

　　With reference to a detailed Application Note from Osram， the article will highlight the application of specific devices in the Osram Oslon Black ranges. These include the SFH4715S and SFH4725S.