激光波长对含能材料起爆阈值的影响

为了解激光波长对含能材料起爆阈值的影响,降低含能材料的激光起爆能量,提高激光激励源的小型化程度,采用飞行时间质谱技术和Bruccton升降法,测试了波长1 064 nm和532 nm两种激光对泰安(PETN)的解离谱图和起爆阈值,分析了波长对起爆机理的影响。结果表明:含能材料激光起爆对波长具有选择性,每种含能材料均具有一些有利于起爆的特征吸收波长;不同波长(1 064 nm和532 nm)激发时PETN存在不同的解离机理。相对于532 nm激光,接近特征吸收的1 064 nm激光能够加速PETN的解离,并使其50%发火能量降低14%。因此,采用含能材料特征吸收波长激光作为起爆激励源,能有效的减少含能材料的起爆阈值。

Effect of laser wavelengths on initiation threshold of energetic materials

In order to understand the effect of laser wavelengths on initiation threshold, reduce the laser initiation energy of energetic materials, and improve miniaturization design of excitation source of laser initiation, dissociation spectral and initiation threshold of pentaerythritol tetranitrate(PTEN) under wavelength 1 064 nm and 532 nm laser were tested by time-of-flight mass spectrometer and bruccton up and down method, and effect of laser wavelengths on initiation mechanism was analysed. Results show that laser initiation of energetic materials has selectivity for wavelengths, and every kind of energetic material possess some characteristic absorption wavelengths which are beneficial to laser initiation. There are different dissociation mechanisms for different laser wavelengths(1 064 nm and 532 nm). Compared with 532 nm laser, 1 064 nm laser, which close to characteristic absorption of PETN, can accelerate dissociation of PETN, and decrease 50 percent firing energy by 14 percent. Therefore, using characteristic absorption wavelengths of energetic materials as excitation source of laser initiation, can effectively reduce initiation threshold of energetic materials.