Method and device for auxiliary exhaust through aircurtain
The present invention discloses a method and an exhaust secondary air curtain means to generate air curtain is provided to surround the portion in which the table area, and is arranged above the receiving table type hood, this received vertical type hood outer edge only fully cover the area, and then activate the air curtain blowing air curtain generator to the receiving opening of the hood type, and activating the receiver type suction air hood. Receiving type hood suction air flow and an air curtain defining a shielded space, that the air curtain can shield sources guide the inner space generated to the receiving-type hood discharged, reached efficacy auxiliary exhaust and limited pollution in the shielded space to prevent pollution lateral diffusion.
A new estimator for a four-element plane array is introduced in order to get acoustic-passive direction estimation of targets.We concern much about the performance of the estimator under a two-target situation.In this paper,the two targets concerned are of the same type of acoustic source.Under different signal to interfere ratios,we propose the change of the precision of the direction estimation as the angle between the two targets changes.Our study was done under the real time Warfield situation,and may help the design of small acoustic-passive direction estimation arrays.