Types and characteristics of multifunctional life detectors

Currently known Multifunctional Life Detectors can be divided into radar wave detectors, video detectors, audio detectors, etc. The comparison based on principles and structures is as follows:

　　I. Acoustic Multifunctional Life Detector 1. Acoustic audio detector. Detects targets by acquiring and amplifying weak sound waves propagating in the air. 2. Vibration wave audio detector. The vibration probe picks up and amplifies vibration waves from the ground to detect targets. Both have the advantages of low cost and relative ease of use. Limitations: The site requires certain holes and cracks extending to the detection equipment; or only suitable for shallow subsurface and large-space detection; rain or fire water will cause certain environmental interference.

　　 II. Video Multifunctional Life Detectors Using visible or invisible light, the camera uses a CCD sensor to capture images and transmits them to the display for imaging. Video visualization is intuitive, simple, easy to use, and inexpensive. Generally, cables are needed to transmit audio signals or gaps and holes during use.

　　 III. Radar Wave Multifunctional Life Detectors 。 Radar The antenna directs the emission of electromagnetic waves, which can penetrate concrete walls, rubble, and debris. Reflection and changes occur upon contact with the human body. Because this change is affected by human body movement, breathing, and even heartbeat activity, the reflected and changed electromagnetic waves are received by the detector. Some special spectrums are analyzed and processed by computer software, and after filtering out background interference, they are displayed on the screen.

　　Radar Wave Multifunctional Life Detectors It is portable, fast-moving, non-contact, and can detect trapped personnel even when isolated and covered by various substances without entering through holes and cracks. Radar electromagnetic waves cannot penetrate solid metal shielding walls, but can detect trapped personnel behind the wall. Life detection radar mainly consists of wireless detection instruments and handheld computers.

　　Radar Wave Multifunctional Life Detectors First, radar waves are emitted, which can penetrate ordinary building walls and rubble, reaching a target up to 6 meters away. The target's movement, breathing, and heartbeat cause certain changes in the radar waves, and the changed radar waves are sent back to the handheld computer via the antenna. Through data processing by specialized software in the computer, corresponding waveforms and signal displays are obtained, thus determining whether there are survivors within the measured range. It can be said to be a very effective multifunctional life detector.

　　When operating the radar wave Multifunctional Life Detectors ensure that the distance between the handheld computer and the wireless detection equipment is within 1.5-15m, and there is no other suspicious movement within 6.1m of the detector antenna. The radar wave Multifunctional Life Detectors equipment can usually search within the effective space within 3 minutes and further locate trapped personnel.