positive pressure wave

Flux sensor selects HY-2 type infrared sensor and relates the positive and negative judgement program, which may avoid the bad influence of returning oil pressure wave and improve the test precision of the sensor collecting data at the same time.

流量传感器选用了有两对光敏管的HY-2型红外线传感器，与正反转判断程序相结合，避免了单缸脉冲回油压力波的干扰，提高了数据采集的精度。

As for the control of the negative surge wave, quick opening regulating valves can be used, while the positive surge wave, low pressure relief valves can be used in pressure relieving besides sensitive regulating valve system, in order to reduce surge pressure.

对于故障性负水击波，可采用快速调节阀控制，而对于正水击波，除采用反应灵敏的调节系统外，还可采用低压泄压阀泄压，以降低水击幅度。

Methods The physical parameters of blast wave were measured by PCB pressure transducers ( USA) during underwater and air explosions of 200g, 500g and 1000g TNT respectively. Consequently, the propagation speed, peak overpressure value, positive duration and impulse of blast wave were analyzed.

方法分别用200、500和1000g TNT进行水下和空气中爆炸，用美国PCB公司生产的压力传感器测定冲击波物理参数，分析冲击波的传播速度、超压峰值、正向持续时间和冲量。