隧道洞外亮度監(jiān)測儀是保障隧道行車安全的關(guān)鍵設(shè)備，它基于光電轉(zhuǎn)換技術(shù)，利用硅光電二極管等高精度傳感器，實(shí)時(shí)捕捉隧道洞口外部自然光亮度變化，測量范圍達(dá)0～7500cd/m2，精度0.1cd/m2，響應(yīng)時(shí)間低于毫秒級(jí)。設(shè)備具備IP68防護(hù)等級(jí)，能適應(yīng)-50℃至+70℃環(huán)境，支持RS485等數(shù)字接口，可實(shí)現(xiàn)遠(yuǎn)程監(jiān)控與數(shù)據(jù)存儲(chǔ)，動(dòng)態(tài)調(diào)節(jié)照明以消除“黑洞效應(yīng)"和“白洞效應(yīng)"。

隧道洞外亮度監(jiān)測儀能滿足整個(gè)隧道照明控制的要求，預(yù)置控制模式的控制器根據(jù)光源測量值按預(yù)設(shè)參數(shù)自動(dòng)進(jìn)行切換照明開關(guān)，為隧道照明提供了優(yōu)良值。它的設(shè)計(jì)符合CIE關(guān)于隧道照明測量的要求，并能滿足《公路隧道通風(fēng)照明設(shè)計(jì)規(guī)范》，而且它的整體設(shè)計(jì)能滿足野外惡劣的工作環(huán)境地要求。

安裝方式：

隧道光強(qiáng)度監(jiān)測儀安裝在隧道內(nèi)指定區(qū)域的墻壁上，為了避免因事故或汽車殘骸對(duì)其的損傷，需安裝在4m左右的高度，距隧道入口大于10m的適當(dāng)位置。隧道光亮度監(jiān)測儀安裝在隧道外高度距路面4m左右，距隧道入口120—200m左右的適當(dāng)位置。具有高可靠性和低維護(hù)量.最新微處理器技術(shù)，數(shù)字化運(yùn)行，安裝調(diào)試簡易。

The tunnel portal brightness monitor is a key device to ensure traffic safety in tunnels. It is based on photoelectric conversion technology and uses high-precision sensors as silicon photodiodes to capture real-time changes in the brightness of natural light outside the tunnel portal. The measuring range reaches 0 to 7500 cdm2, with an accuracy of 0.1 cd/m2 and a response time below the millisecond level. The equipment has an IP68 protection grade, can to extreme environments from -50℃ to  70℃, supports digital interfaces such as RS485, and can achieve remote monitoring and data storage. It dynamically adjust lighting to eliminate the "black hole effect" and "white hole effect".