报警系统

In this paper, based on a microcontroller control of the fire alarm monitoring system design.

本文介绍了一个基于单片机控制的火灾报警监测系统的设计。

First it produces the pulse signal by the multivibratorwhich is consisted of 555 timer and send in the detecting coil to form the alternating magnetic field, then it asopts UGN3503 linear half-effect as prode to the magnetic field change into the voltage signal change,after enlargement electric circuit and peak value examination electric circuit,the signal be treated to send into ADC0809 modulus converter change moduluses, then the digital signal after the modulus converter is changed is sent into AT89C51one-chip computers afterwards, after the digital filter, AT89C51one-chip computers afterwards compares the data to the reference voltage and judges whether to have detected the metal and alarm.

这个系统是以AT89C51单片机为核心，首先由555定时器构成多谐振荡器产生脉冲信号送入探测线圈以形成交变磁场，然后经过线性霍尔器件UGN3503将磁场变化转换为电压信号的变化，经过放大电路和峰值检测电路，经数模转换之后输入到单片机中，由单片机对数据进行软件滤波之后，与基准值比较之后，判断是否存在金属和报警显示。

The problems involved the safety and speed of the system, the design of the Weaving Plan, static and dynamic purview control and annunciator.

包括系统的安全性和速度，上机图的设计，静态、动态权限控制设计以及报警窗设计的问题。

This system can be surveyed in early days to the fire and autoalarm, can output and link the signal of putting out a fire in time according to the position of condition of a fire , start corresponding fire controls facility, put out a fire .

该系统既能对火灾发生进行早期探测和自动报警，又能根据火情位置及时输出联动灭火信号，启动相应的消防设施，进行灭火。

Speaking from the function, the long-distance image surveillance system can be divided into two parts. The first part is a module of signal gathering and control. It uses AT89C51 as the main processor, which includes sensor signal measure, autodial, circuit state measuring, DTMF signal decoding, and automatic control.

从功能上讲，远程图像监控系统大至可分为两部分：第一部分是以A789C51为主处理器的信号采集和控制单元，包括传感器信号检测、自动拨号、线路状态检测、DTMF信号解码和自动控制五个小模块，用以实现对现场信号的采集、自动拨号报警和远程控制。

This system only uses a piece of microprocessor realization control keyboard, and may realize the real-time examination, the computation, the demonstration, the printing, reports to the police, function and so on correspondence as well as disturbance automatic reset.

本系统只用一片微处理机实现控制键盘，并可实现实时的检测、计算、显示、打印、报警、通信以及干扰自动复位等功能。

The key part of light alarm circuit of the system is the flashing tube and the life level of the main charge and discharge capacitance. Thus ,in this design, adopted autotransformer step-up type, two-level filter and double flashing tube, in order to light the burden of the main charge and discharge capacitance, reduce the heat productivity and extend the life level of the capacitance.

在系统的光报警电路中关键部件是频闪管和主充放电容的寿命，因此在电路设计中采用自耦变压器升压方式和双级滤波、双频闪管等独特的电路结构，减轻主充放电容的负担，减少发热量，延长电容使用寿命。

It can be used as auxiliary surgical instruments on the operation of traditional pedicle screw fixation.

在体外实验中，预警螺锥在胸腰椎(T8~L5)椎弓根螺钉钉道准备过程中，具有良好的报警效应，可作为传统椎弓根系统手术中的辅助器械。

Burglar alarm, computer and systems integration, integrated wiring for the integrated high-tech enterprises.

防盗报警，计算机及系统集成、综合布线为一体的高新科技企业。

Since its establishment, has been engaged in television monitoring, burglar alarm, public address systems sales, engineering, installation and technical consulting services.

公司成立以来，一直从事电视监控、防盗报警、公共广播等系统的销售、工程设计安装与技术咨询服务。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。