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火箭飞行期间,对双组元液体火箭发动机推进剂贮箱的液位测量是一个重要参数,尤其是在为了确定瞬间推进剂混合比而随时对它进行控制时更为重要。可达此目标的手段之一是采用超声方法。这种方法在于测量由位于贮箱底部的探头发出并从液体表面反射回来的超声波的传播时间。法国航空空间研究院验证了在偏二甲肼(UDMH)和四氧化二氮(N_2O_4)中最大液位高度三米范围内这种测量方法的可行性。法国空间研究中心决定将此技术用于阿里安运载火箭第一、二级贮箱的液位测量。采用法国克鲁泽公司研制的飞行型液位测量装置,从实验室实验和级鉴定性热试期间所获得的试验结果验证了这种测量方法的有效性,达到的精度也满足技术要求。
During rocket flight, liquid level measurement of a two component liquid rocket engine propellant tank is an important parameter, especially when it is being controlled at any moment in time to determine the instantaneous propellant mix ratio. One way to achieve this goal is to use ultrasound. This method consists in measuring the propagation time of the ultrasound emitted by the probe located at the bottom of the tank and reflected back from the liquid surface. The French Aeronautic Space Research Institute verified the feasibility of this measurement method at a maximum height of three meters in UDMH and N2O4. The French space research center decided to use this technology for the level measurement of the first and second tanks of the Arian launch vehicle. The flight type liquid level measuring device developed by Kruger Company of France validates the validity of this measuring method from the experimental results obtained during the laboratory experiment and the stage of qualitative thermal test, and the accuracy achieved meets the technical requirements.