摘要
针对巷道断面平均风速测量误差大、适应性差、缺乏实时在线测量手段问题,结合巷道断面特点,基于超声波在介质中顺、逆流传播时会产生时间差的特性,采用发射频率自动跟踪修正技术、高压脉冲驱动技术实现高能量超声波发射与远距离渡越;采用程控滤波放大技术、峰值保持技术实现接收信号的高质量处理;采用AD高速采样时间定位技术、浮动门限阈值时差测量技术、电路时延自主测量技术实现超声波渡越时间的精准测量,最终实现巷道断面线平均风速测量。测量系统经气体流量标准装置实流测试,测量精度满足并超越相关标准要求,与当前巷道断面风速测量技术手段相比,本系统具有线平均风速一次性测量、准确度高、适应性强、实时在线监测等优点。
Roadway cross section for the average wind velocity measurement error,poor adaptability and the lack of real-time online measurement problem,combining with the characteristics of roadway section,based on the ultrasonic wave in medium,countercurrent spread would produce the time characteristic,USES the transmission frequency automatic tracking correction technology,drive technology to realize high voltage pulse high-energy ultrasonic launching and transit at a distance;The received signal is processed with high quality by using program controlled filtering and amplification technology and peak keeping technology.AD high-speed sampling time positioning technology,floating threshold threshold time difference measurement technology,circuit delay autonomous measurement technology to achieve the accurate measurement of ultrasonic transit time,and finally realize the roadway cross-section line average wind speed measurement.The measurement system has been tested by the gas flow standard device,and the measurement accuracy meets and exceeds the relevant standard requirements.Compared with the current roadway cross-section wind speed measurement technology,the system has the advantages of linear average wind speed one-time measurement,high accuracy,strong adaptability,real-time online monitoring and so on.
作者
李涛
樊荣
于庆
但强
罗前刚
LI Tao;FAN Rong;YU Qing;DAN Qiang;LUO Qiangang(middling coal Science and Engineering Group Chongqing Research Institute Co.,Ltd.,Chongqing 400039,China;State Key Laboratory of Gas Disaster Monitoring and Emergency Technology,Chongqing 400039,China)
出处
《自动化与仪器仪表》
2023年第8期34-36,43,共4页
Automation & Instrumentation
基金
中国煤炭科工集团科技创新创业资金专项项目(2021-TD-ZD009)。
关键词
巷道断面风速
超声波测风
矿井通风
线平均风速
超声波渡越时差
tunnel section wind speed
ultrasonic wind measurement
mine ventilation
linear mean wind speed
ultrasonic cross time difference
