Uncovering the Vessel of Life Detector: An Important Tool in Earthquake Relief

The earthquake almost razed Wenchuan into the ground. It was full of broken walls and broken tiles. Most people were forced to escape under the rubble in an earthquake. How to quickly rescue the wounded who were buried under the rubble has become the focus of disaster relief, but it is also difficult. In addition to the lack of large-scale machinery, life signs have become weaker and weaker over time.

In order to detect the wounded under the rubble, firefighters widely use a high-tech life-saving instrument - a "life detector" dedicated to the rescue of trapped people in disasters. With this detector, it is possible to detect whether or not there are people trapped in areas that cannot be reached by manpower, thereby implementing rescue. In the minute and second battle of rescue work, life detectors can help search and rescue personnel quickly, accurately and safely find survivors who are in distress, so as to obtain valuable time for rescue work.

The Life Detector can detect movements in real time. It can penetrate concrete, brick, snow, ice and mud and is designed for large-scale natural disasters such as earthquakes, snowstorms and mudslides. The life detector mobile detection system is a sensor composed of the following main components. It includes a transmitter for transmitting an ultra-wideband signal, a receiver for detecting a reception return signal, and a signal for reading in a receiver and performing The algorithm handles the computer and the sensor contains programmable firmware. The signal generated by the sensor is transmitted to the handheld computer (PDA controller) for display via wireless transmission. Sensors and controllers have their own independent power supply.

The life detector is simply a breathing and motion detector. Its working principle is that the radar signal transmitter continuously emits electromagnetic signals and scans a certain space. The receiver continuously receives the reflected signal and performs algorithm processing on the return signal. If the detected person remains stationary, the return signal is the same. If the target is moving, the signal will be different. By comparing the signals received in different time periods and other algorithm processing, it can be determined whether the target is moving. The life detector works by testing the subject's breathing movement or movement. Because of the low frequency of breathing, which is usually 1 or 2 times per second, breathing exercises can be distinguished from other higher frequency sports. Compared to other lifesaving systems, most systems, such as camera systems, have limited scope of detection, except that they cannot penetrate obstacle detection movements. They can only be alerted when a moving distressed person enters the field of view of the camera lens or sensor. Audio-based detection systems are greatly limited by distance, obstacles, wreckage, and whether the person in danger is still strong and awake to be able to make sounds.