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报道了用脉冲激光引爆并测定粉尘云最小点火能量的方法。分别测定了Ca-Si,Ti和Mg粉尘云的最小点火能量,Ca-Si≤70 mJ;Ti≤7 mJ;Mg≤30 mJ。它们均低于过去所发表的结果。此法的优点是:没有火花放电那样的冲击;点火建立之前粉尘云的浓度不会改变,点燃粉尘云时的能量损失很小;用于点火的激光能量可以精确的测定。
The method of detonating pulsed laser and measuring the minimum ignition energy of dust cloud was reported. The minimum ignition energies of Ca-Si, Ti and Mg dust clouds were measured respectively, with Ca-Si≤70 mJ, Ti≤7 mJ and Mg≤30 mJ. They are lower than the results published in the past. The advantage of this method is that there is no impact as a spark discharge; the concentration of dust cloud does not change before the ignition is established and the energy loss when igniting the dust cloud is small; and the laser energy used for ignition can be accurately measured.