At about 11:40 on December 20, a landslide occurred on the back side of Hengtaiyu Industrial Park, Fenghuang Community, Guangming New District, Shenzhen. After preliminary verification, 33 buildings were buried or varying degrees. Damage, although many survivors were rescued at the scene, as of press time, 91 people still lost.
After the accident, Lin Shaochun, member of the Standing Committee of the Guangdong Provincial Party Committee, and Liu Zhigeng, deputy governor, rushed to the scene. The headquarters of the accident was set up, and the head of the Shenzhen Municipal Party Committee, Ma Xingrui, was appointed as the chief commander. There were 11 teams under the overall planning and coordination of more than 2,000 people in search and rescue work. Seven people who have been rescued at the scene have all been sent to a nearby hospital for treatment, and there is no danger to their lives.
At the scene of the accident that rescued the night, there was drizzle under the sky. On the "mud layer" of more than 100,000 square meters, firefighters from Guangzhou and Shenzhen are in a group of people, and life detectors are used to detect signs of life. Once you find signs of life, insert a red flag. How does the life detector detect survivors?
Living people have vital signs, the body will have temperature, breathing, mentality, will produce carbon dioxide gas, and these are the basis for life detectors to collect and judge survivors. Let's take a look at how the life detector works and what are the limitations.
1 sound wave detector, survivors buried deep in the ruins, weak sounds such as heartbeat, breathing, movement, sound wave detector can detect, its working principle is to capture the signal of sound wave vibration through the microelectronic processor. The sound detector detects it like a large net, and then gradually closes the net to determine the location of the survivor. Because the sound conductivity is very high, even if the buried person is trapped under a fairly large large-scale cement floor, as long as the heartbeat has a slight vibration, the detector can often judge. But like a carbon dioxide detector, the sound detector will also take the animal's voice together. However, acoustic detectors are susceptible to ambient broadband noise.
2 radar detectors, more intelligent than sound detectors, can accurately find the position of people in the ruins, and let the concrete wall, steel doors, trees, etc., open space detection distance of up to 500 meters. However, when the instrument encounters the above obstacles, the detection distance will decrease. Its working principle is to detect ultra-low frequency waves emitted by the human heart. But the ruins of the building are easy to affect the detection effect.
3 Far-infrared detectors, the human body has a certain body temperature compared with other objects. This detector uses the temperature difference to identify survivors. Any object that produces infrared radiation at temperatures above absolute zero is also a natural source of infrared radiation. However, the infrared radiation characteristics of the human body are different from the infrared radiation characteristics of the surrounding environment. The infrared life detector uses the difference between them to separate the target to be searched from the background in an imaging manner, but the glass isolates the human body heat energy signal.
4 optical detectors, generally used together with search dogs or other detectors. The optical life detector is also called the 'snake eye'. Just like an endoscope for medical examination, the human body can see the terrain deep in the ruins. Generally used in conjunction with search dogs or other detectors. The optical life detector is also called the 'snake eye'. Just like an endoscope for medical examination, the human body can see the terrain deep in the ruins. The body of the optical detector is tubular and very flexible and can be free to twist in the rubble. The front of the instrument has a small probe that can be probed into tiny gaps, similar to camera instruments, to send information back to help rescuers understand the environment in which the trapped person is located.
Different life detectors have different ways of using them. Through the use of life detectors in this article, we can also extend our help in emergency situations and strive to minimize the number of people losing contact.
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