摘要
为了验证超声波气体流量计在低压环境的工业适应性,该文自主研发了针对低压环境的矿用超声波气体流量计样机,在压力测试平台上分析了管道压力对超声波接收信号衰减的影响。主要针对负压环境下超声波信号信噪比低的特点,采用窄带滤波结合自动增益控制技术实现了超声波信号的稳定接收,采用相对阈值法结合过零检测法完成超声波渡越时间解算和流量计算。在煤矿负压管道中展开工业性试验,试验结果表明该设计方法测量精度优于±2.86%。
In order to verify the industrial adaptability of ultrasonic gas flowmeter in low-pressure environment,this paper independently developed a prototype of ultrasonic gas flowmeter for low-pressure environment,and analyzed the influence of pipeline pressure on ultrasonic received signal attenuation on the pressure test platform.According to the characteristics of low SNR of ultrasonic signal in negative pressure environment,narrow-band filter and automatic gain control technology are used to realize the stable reception of ultrasonic signal.The relative threshold method and zero crossing detection method are used to solve the ultrasonic transit time and flow calculation.The test results show that the design method can reduce the error of"wrong period"of transit time,and the measurement accuracy is better than±2.86%.
作者
马勤勇
MA Qinyong(China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400039, China)
出处
《工业仪表与自动化装置》
2021年第4期29-32,共4页
Industrial Instrumentation & Automation
基金
天地科技股份有限公司科技创新创业资金专项项目(2018-TD-QN057,2019-TD-QN030)。
关键词
超声波气体流量计
渡越时间
自动增益控制
相对阈值法
过零检测
ultrasonic gas flowmeter
transit time
automatic gain control
threshold method
zero crossing detection
