舰船卤代烷灭火系统储液瓶液位超声波检测技术

为解决舰船卤代烷灭火系统储液瓶液位检测的难题,采用超声波脉冲反射式定点液位测量法,利用超声波在液体与气体介质中余振信号衰减快慢使回波信号波形的包络面积大小不同来界定液位。利用小波分析理论,对采集的回波信号进行消噪降噪,得到了真实的信号。提出了储液瓶测点内部气态与液态的判据,通过比对降噪后气态和液态产生的回波信号的包络面积,可准确确定液位。

An Ultrasonic Liquid Level Detecting Technology for Liquid Cylinders in Ship Halon Fire-Extinguishing Systems

This paper presented a fixed-point liquid level measuring method using ultrasonic pulse reflec tion to detect the dose of warship halon fire-extinguishing systems.When ultrasonic wave travels through the gaseous medium and liquid medium,the attenuation rate of the remnant ultrasonic signal was found to be distinct,which was reflected by the different envelope area of the return remnant signal.In this way,the liquid level could be easily defined.Firstly,the received return signal was de-noised using the wavelet analysis theory,and the resulted low-frequency signal was reconstructed into a more realistic signal.Next,a threshold was proposed to judge whether the medium at the detecting point is gaseous or liquid.Finally,the envelope area of the remnant wave signal was examined and compared with the threshold,through which the liquid level can be precisely determined.Generally,all liquid level measuring problems in gas containers with pressure systems similar to fire extinguishing agents 1301,which are widely adopted as ma rine fire extinguishers,could be easily solved by this method.