|
With the continuous improvement of the level of information technology in mine, mine production safety monitoring put forward higher requirements. Analog camera signal quality is poor, the transmission distance is short, less than, and downhole monitoring equipment can not be combined downhole images, sound and environmental parameters monitoring organic defects, intrinsically safe, with video surveillance, audio surveillance, environmental parameter access, network remote transmission function underground network cameras, to make it play a greater role in the field of mine safety production monitoring. In this paper, the analysis of system requirements, comparing different solutions, finally established Freescale's ARM9 architecture-based, integrated hardware video codec i.MX27 processor as the system master design, and modular methods were designed minimal system, video module, audio module, environmental parameters access module, Ethernet module, power supply module hardware circuit. Video module with low light digital CCD camera, the image acquisition mine low-light environments, inside the processor H.264 hardware video the codec compression coding, transmission via Ethernet to the monitoring center; audio module audio CODEC chip to complete the voice data the codec processing; underground environmental parameters access module via RS-485 interface or Mini PCI-E interface wireless communication module underground environment parameter access function; Ethernet module Ethernet access underground The network used to complete the long-distance transmission of video, audio, environment parameter information; low voltage (<3.3V) power module design solutions to meet intrinsically safe design requirements while achieving a low power consumption of the device (only 4.5W) . System through a six-layer PCB board design, EMC design, greatly increasing the reliability of the equipment. In addition to the completion of the design of the system hardware, the article also responsible for the completion the transplantation and configuration of the the related Linux operating system and the hardware platform, network device driver design. In the system test, in addition to the various electrical properties to meet the requirements, it is possible to complete the image capture under low light conditions for ordinary environment and analog downhole, video and audio data compression encoding and network remote transmission. The experiments show that the ARM9-based underground network camera can achieve downhole video and audio information collection, processing, storage and transmission, has a high application value and significance.
|