双鉴红外探测器工作原理

1、被动红外复合的探测器，它将微波和红外探测技术集中运用在一体。在控制范围内，只有二种报警技术的探测器都产生报警信号时，才输出报警信号。它既能保持微波探测器可靠性强、与热源无关的优点又集被动红外探测器无需照明和亮度要求、可昼夜运行的特点，大大降低探测器的误报率。这种复合型报警探测器的误报率则是单技术微波报警器误报率的几百分之一。简单的说，就是把被动红外探测器和微波探测器做在了一起，主要是提高探测性能，减少误报。 除此之外，市场上也有把微波和主动红外、振动探测器、声音探测器等组合的产品，大家可参考说明书了解。 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. 被动红外探测技术是一探测人体红外辐射与背景物体（墙、家具、树木、地形等）红外辐射相比较而产生的差异部分依据的，背景红外辐射量往往是微弱而稳定的。入侵者（包括各种动物在内）的红外辐射量往往是大的，可以引起警报信号。如果只用一种技术进行探测，各种动物（如狗、猫、老鼠等）及各种非动物的红外辐射源（如暖气、强灯光、太阳光等）往往也会引起警报的，这种报警是符合工作原理的，专门从事双技术探测器研究的科研人员，将微波探测技术和被动红外探测技术组合在一个机壳里构成一种入侵探测器。组成的这种双技术探测器，都选用

5、了不同的工作原理的两种技术组合在一起，使从工作原理上无法避免的误报警的到了抑制。因为双技术探测器要求两种技术都提供报警信息时，才提供一个触发报警信息。其中任何一种提供报警信息，都不触发报警。因此使误报问题得到有效的控制，同时也扩大了探测器的使用范围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等跳线可以调整探测器的性能；许多探测器中还加装了防拆开关，布防状态下如果出现拆机行为，探测器将会立即触发报警；同时，部分厂家的产品将探测器性能自动检测、电池电量检测、信号传输检测等集成到一体，大大增强了产品的性能，但也因成本的增加，价格高出普通红外探测器的两倍以上甚至更多。B.They tend to be lazy and troublesome.定义二：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被动红外双鉴探测器性能最佳，其误报率是单技术探测器的D.to see how they act in different situations25.What does the medicine for ADD help to do?倍，因此被广泛地应用到实际的工程项目之中。A.Stop making troubles. B.Respond more to distractions.C.Watch the children carefully. D.Stay on a task longer.Passage Two“Ques