基于FPGA对试验室CO浓度监测的控制系统设计

Design of the FPGA-Based Control System for CO Concentration Monitoring in Laboratory

CO气体是试验室研究中常见的有毒气体,因CO中毒引发的事故不断发生,故对试验室CO浓度的监测是非常有必要的。然而,国内对CO检测的研究起步较晚,各种检测方法、技术和仪器相对较少,应用于实际中的气体检测仪种类也不多。因此,基于现场可编程门阵列(FPGA)技术,构建了一个试验室CO浓度监测的控制系统。该系统以FPGA可编程芯片为核心,利用TGS2442作为CO监测传感器,实时采集现场CO的浓度,通过SL393将TGS2442传送过来的电压信号转化为电频信号,再将电频信号传递给FPGA芯片。FPGA接收电频信息后,对信息进行处理,及时反映现场CO浓度的含量,并以LED灯闪烁为报警信号。试验结果证明,该系统可靠性高、成本低、功耗小、实时性强,不易出现监测盲区。当CO发生泄漏时,可及时自动生成报警信号,提醒人们注意,以免发生事故。该系统具有重要的使用价值。

CO gas is one of the common seen toxic gases to be researched in laboratory, the accidents caused by CO poisoning occur frequently, so it is necessary to monitor the concentration of CO in laboratory. However, the study on CO detection starts late in China, and lack of relevant detection methods, techniques and instruments, the types of the gas detectors used in practice is not many either. Thus,based on field programmable gate array （ FPGA） technology,the CO concentration monitoring and control system in the laboratory has been built. In the system,with FPGA programmable chip as the core,the TGS2442 is used as CO monitoring sensors, the CO concentration on site is collected in real time, then the voltage signals sent from TDS2442 are converted into the electrical signal through SL393, and the electrical signal is transmitted to FPGA chip. The FPGA receives and deal with the electric frequency information, to timely reflect the content of the CO concentration and the alarm signal of LED is flashing. Test results show that the system has advantages of high reliability and real - time performance, low cost, small power consumption, and the blind areas of monitoring are not appearing often, when CO leakage occurs,it can automatically issue alarm signals in time, and warn people to avoid the accident, it has great applicable value.