Smoke detectors mainly implement fire prevention by monitoring the concentration of smoke. The interior of the smoke detector uses ionized smoke sensors. The ionized smoke sensor is a kind of advanced technology, stable and reliable sensor, which is widely used in various fire fighting In the alarm system, the performance is far better than that of gas-sensitive resistance fire alarms. [1]
The smoke detector has a radioactive source americium 241 in the inner and outer ionization chambers, and the positive and negative ions produced by ionization move toward the positive and negative electrodes under the action of the electric field. Under normal conditions, the current and voltage of the inner and outer ionization chambers are stable. Once there is smoke fleeing outside the ionization chamber. Interfering with the normal movement of charged particles, the current and voltage will change, disrupting the balance between the inner and outer ionization chambers, so the wireless transmitter sends out a wireless alarm signal to notify the remote receiving host to transmit the alarm information.
There are 4 conductor pieces on the base of the smoke detector, with wiring terminals on the piece, and no position card on the base, which is convenient for adjusting the direction of the alarm confirmation light of the detector. The detector bus in the wiring pipe is respectively connected to two terminal terminals on any diagonal (no polarity), and the other pair of conductor pieces are used to assist in fixing the detector.
In short, smoke detectors are still relatively common in our lives. They have brought a lot of convenience to our lives. They have played a very good role in safeguarding our safety and let us improve their processes.
The software design of the fire alarm system controller
Because the system is ultimately oriented to end users, and users generally do not understand or need to understand the technical details, the users are directly exposed to the running interface of the software. On the basis of the realization of system functions, users often evaluate the pros and cons of a system through criteria such as the simplicity of the operation interface, the complexity of the operation process, whether the cross-section has good consistency, and whether it is convenient for secondary development. From the perspective of programmers, programs that can be easily maintained and upgraded are vital. Therefore, based on the realization of basic functions, how to provide users with a simple, comfortable and friendly interface, how to make users convenient and simple operating system, how to conveniently maintain and upgrade software on the existing basis, how to It is the goal of modern system software design to enable support for easy secondary development.
The basic functional design requirements of the alarm controller software are as follows:
1) It is necessary to be able to manage each fire detector, including querying the relevant information of the fire alarm detector, modifying the relevant information of the fire detector, adding or deleting the fire alarm detector. During the running of the software, you can observe the working status of the fire detector on the interface at any time.
2) It is necessary to be able to accurately identify the location of the fire detector that has caused a fire or failure, and display relevant alarm information on the interface to prompt the operator to deal with it. In the event of a fire, the system will not only display the alarm information on the screen and issue an alarm, but also print out the relevant alarm information for easy reference and analysis.
3) The software must complete the communication between the alarm controller and each fire detector. There is wireless communication between the alarm controller and the fire alarm detector to receive the data sent by the fire detector and complete the inspection of the fire detector.
4) The software must also be able to manage the relevant information of the operator. Operators can be added or deleted, and existing operator information can be modified. When the software is running, it is necessary to enter the operator number and password to enter the system, so that the operating system personnel can be better managed and the system has higher security. The software must also be able to easily query the data records transmitted between the alarm controller and the fire detector, as well as the main interface of the program, the alarm information query module, the communication module, the fire alarm processing module, the detector query module, the detector management module, the operator management module, and the system operation log. The history of the module system.