雙鑒紅外探測(cè)器工作原理

1、被動(dòng)紅外復(fù)合的探測(cè)器，它將微波和紅外探測(cè)技術(shù)集中運(yùn)用在一體。在控制范圍內(nèi)，只有二種報(bào)警技術(shù)的探測(cè)器都產(chǎn)生報(bào)警信號(hào)時(shí)，才輸出報(bào)警信號(hào)。它既能保持微波探測(cè)器可靠性強(qiáng)、與熱源無關(guān)的優(yōu)點(diǎn)又集被動(dòng)紅外探測(cè)器無需照明和亮度要求、可晝夜運(yùn)行的特點(diǎn)，大大降低探測(cè)器的誤報(bào)率。這種復(fù)合型報(bào)警探測(cè)器的誤報(bào)率則是單技術(shù)微波報(bào)警器誤報(bào)率的幾百分之一。簡(jiǎn)單的說，就是把被動(dòng)紅外探測(cè)器和微波探測(cè)器做在了一起，主要是提高探測(cè)性能，減少誤報(bào)。 除此之外，市場(chǎng)上也有把微波和主動(dòng)紅外、振動(dòng)探測(cè)器、聲音探測(cè)器等組合的產(chǎn)品，大家可參考說明書了解。 they become an adult. Those that do not lose

2、their ADD behavior continue to have a hard time staying on one task for very long. There are many reasons why a person may have a hard time focusing on a task for very long. A doctor will need to see or hear about how the person acts in a lot of different places. The medical history of the person is

3、 important, too. There are tests that can be given to help in seeing if the person has ADD. Sometimes medicine can help a person with ADD. It can help the person to focus on a task longer and to cut down on responding to distractions. The medicine must be given by a doctor and the person with ADD ca

4、refully watched to see if the medicine is helping. 被動(dòng)紅外探測(cè)技術(shù)是一探測(cè)人體紅外輻射與背景物體（墻、家具、樹木、地形等）紅外輻射相比較而產(chǎn)生的差異部分依據(jù)的，背景紅外輻射量往往是微弱而穩(wěn)定的。入侵者（包括各種動(dòng)物在內(nèi)）的紅外輻射量往往是大的，可以引起警報(bào)信號(hào)。如果只用一種技術(shù)進(jìn)行探測(cè)，各種動(dòng)物（如狗、貓、老鼠等）及各種非動(dòng)物的紅外輻射源（如暖氣、強(qiáng)燈光、太陽(yáng)光等）往往也會(huì)引起警報(bào)的，這種報(bào)警是符合工作原理的，專門從事雙技術(shù)探測(cè)器研究的科研人員，將微波探測(cè)技術(shù)和被動(dòng)紅外探測(cè)技術(shù)組合在一個(gè)機(jī)殼里構(gòu)成一種入侵探測(cè)器。組成的這種雙技術(shù)探測(cè)器，都選用

5、了不同的工作原理的兩種技術(shù)組合在一起，使從工作原理上無法避免的誤報(bào)警的到了抑制。因?yàn)殡p技術(shù)探測(cè)器要求兩種技術(shù)都提供報(bào)警信息時(shí)，才提供一個(gè)觸發(fā)報(bào)警信息。其中任何一種提供報(bào)警信息，都不觸發(fā)報(bào)警。因此使誤報(bào)問題得到有效的控制，同時(shí)也擴(kuò)大了探測(cè)器的使用范圍A.Not focusing on what they are doing. B.Talking like they are in a hurry.C.Thinking twice before taking action.D.Following one direction at a time.22.The word “hyperactive” (L

6、ine 4 most probably means _”.A.talkative B.overactiveC.sensitive D.threatening、J2等跳線可以調(diào)整探測(cè)器的性能；許多探測(cè)器中還加裝了防拆開關(guān)，布防狀態(tài)下如果出現(xiàn)拆機(jī)行為，探測(cè)器將會(huì)立即觸發(fā)報(bào)警；同時(shí)，部分廠家的產(chǎn)品將探測(cè)器性能自動(dòng)檢測(cè)、電池電量檢測(cè)、信號(hào)傳輸檢測(cè)等集成到一體，大大增強(qiáng)了產(chǎn)品的性能，但也因成本的增加，價(jià)格高出普通紅外探測(cè)器的兩倍以上甚至更多。B.They tend to be lazy and troublesome.定義二：C.They have to rely on medical treatmen

7、t.D.They have a hard time in their life.24.Tests can be given to children by a doctor _.A.to help them focus on a task longerB.to help confirm whether they have ADD被動(dòng)紅外雙鑒探測(cè)器性能最佳，其誤報(bào)率是單技術(shù)探測(cè)器的D.to see how they act in different situations25.What does the medicine for ADD help to do?倍，因此被廣泛地應(yīng)用到實(shí)際的工程項(xiàng)目之中。A.Stop making troubles. B.Respond more to distractions.C.Watch the children carefully. D.Stay on a task longer.Passage Two“Ques