Research And Design Of Test System On Ultraviolet Fire Detector’s Working Life

Fire has promoted the development of human civilization, has brought light andwarmth to people. But fire has caused many disasters which seriously threatened publicsafety and social development. In order to properly use fire to benefit people, and it isbetter to prevent fire disaster than cure it, fire detector arises at the historic moment.Ultraviolet flame detector is developed along with the development of fire detection. Itis a kind of fire detector which is sensitive to the burning flame’s spectrum feature, lightintensity and flame flicker frequency. It has high response speed, stable and reliableperformances, and the advantages of high sensitivity detection. Before the ultraviolet flamedetectors put into use and make sure they can work long time under high temperatureenvironment, an ultraviolet flame detector life test platform is designed for a series ofperformance test and fatigue test. This platform can operate one to four sets of differenttypes of products at the same time, it also can test the same type of the products in differentenvironmental conditions.This test platform is composed by two parts:hardware circuit modules andman-machine interactive interface. In the test process, the mercury lamp light simulates theultraviolet flame begin to work. Hardware circuit module has to complete the followingmission: making power control module to control mercury lamp power supply; making24V power module and48V power module to supply power for different types of testedproducts; making digital instrument switching module, ensure that they can take turns todisplay the four sets of the tested products’ working voltage,working current and feedbackvoltage; making signal acquisition module implement to collect feedback signal, andtransport data to industrial control computer, this module is the key to connectedcommunication between upper machine and lower machine. In order to realize theautomation in test process, all the test is operated on the human-computer interactiveinterface. The computer’s screen is touch screen, testers can operate the experiment directlyby hands through the screen. The computer is equipped with a keyboard and mouse, whichare also two kinds of interactive tools. Operators can set test types and the trial productmodel in the operation area of the interface; set mercury lamp power and numerical controlpower’s supply condition; check the tested products’ trend chart about working voltage, working current and feedback voltage; check test schedule; access to or print testreports.This issue select C8051F040MCU as the core of the hardware circuit which wascommonly used in industrial project. This chip internally installed a high speed A/Dconverter, which can directly converted the collected analog signal to digital signal, thentransfer it to computer for processing and display. We use C++Builder5.0to designhuman-computer interactive interface. C++Builder5.0has many components in itsintegrated development environment, and provides the RAD environment in which canprogramming the drag-and-drop components. This software use object-oriented C++as itsprogramming language, the advantages are: clear code structure, easy readability, efficientprogram execution. Finally the test platform has accomplished, we conduct the experimentand conclude the test results, which has verified the usefulness of the test platform.