Relevant knowledge about air defense alarms is as follows:
1. Air defense alarm
"Air defense alarm" is the abbreviation of "air defense alarm signal". What we usually say "issuing an air defense warning" actually refers to issuing an air defense warning signal.
2. Alarms
According to the energy conversion method, they are divided into four categories: electric, electroacoustic, pneumatic and hand-operated alarms.
According to the sound pressure of the audio signal, it is divided into large, medium and small sirens. The sound pressure level of large sirens is above one hundred decibels, the sound pressure level of medium-sized sirens is several tens of decibels, and the sound pressure level of small sirens is below several tens of decibels.
According to different usage conditions, they are divided into two types: fixed sirens and mobile sirens. Mobile sirens mainly install air defense sirens on cars.
In addition, sirens, wired and wireless radios, televisions, telephones, the Internet, and bells and gongs can also be used as auxiliary equipment and means for alarming.
3. Conditions for sounding air defense sirens
In normal times, in accordance with the relevant provisions of the "Civil Air Defense Law of the People's Republic of China", such as during the "September 18th" period, it can be carried out Test blast; in times of war, the blast shall be sounded in accordance with the requirements specified in the air defense alarm sound signal.
4. Masses
Alarm sounding is divided into normal sounding and wartime sounding.
The purpose of testing air defense sirens on a daily basis is to better test the integrity of the city’s air defense warning facilities and the sound effects of the alarms, to familiarize the general public with air defense warning signals, and to enhance the concept of national defense and people’s awareness of air defense. Passers-by do not need to take any measures and can continue to maintain normal work and life order.
In wartime, when citizens hear an air defense warning signal, they should remain calm, carefully listen to what kind of warning signal is issued, and then take corresponding measures.
5. In peacetime, the purpose and significance of organizing air defense siren test blasts
First, to implement national laws and regulations. The "Civil Air Defense Law of the People's Republic of China" stipulates: "Local people's governments at or above the county level may organize test air defense sirens as necessary."
The second is to further enhance the general public's concept of national defense, strengthen people's awareness of air defense, warn citizens to be prepared for danger in times of peace, and improve their self-rescue and mutual rescue capabilities in response to wars and natural disasters.
The third is to test the integrity of the air defense warning system, grasp the actual coverage of warning signals, and deploy air defense sirens scientifically and rationally.
The fourth is to organize air defense siren test blasts, which is of great significance to improving the ability to carry out the mission of "wartime air defense, peacetime services, and emergency support" and protecting the safety of people's lives and property.
6. Quickly enter the civil air defense project after hearing the alarm during wartime
(1) Obey the instructions of the on-site staff and do not stay, crowd, or make noise.
(2) Wear a backpack, do not carry the bag, do not carry the bag, hold the child, do not lead the child.
(3) When there is no light, free your right hand, lean to the right side to explore and quickly enter the civil air defense project.