The Laser-Ultrasonic technique uses laser energy to generate ultrasound waves in various solids. In normal conditions, this technique is used to inspect large structures without destruction, but in military use, we hope get this destruction. Different races and different parts of the human body have different thickness of the epidermis. When the laser irradiates the human skin, different thickness of the skin will inevitably affect the results. In this paper, 10 laser pulses were simulated to irradiate human skin with different thickness of epidermis. The results show that the thinner the thickness of epidermis, the greater the temperature rise of skin, and the greater the displacement. When the thickness is more than 200 microns, the temperature change under the skin is not obvious, but the displacement direction changes and the displacement amplitude is smaller than the positive displacement.
The Laser-Ultrasonic technique uses laser energy to generate ultrasound waves in various solids. In normal conditions, this technique is used to inspect large structures without destruction, but in military use, we hope get this destruction. Nociceptors in Human skin can feel cold, heat, mechanical and other stimuli, when the stimulus exceeds a certain threshold will produce pain. Based on this principle, a laser induced pain weapon may be made. The generated ultrasound wave form is affected by features of laser pulse. The results obtained from the finite element model of laser generated ultrasound are presented in terms of temperature and displacement. At first step, the transient temperature field can be precisely calculated by using the finite element method. Then, laser generated surface acoustic wave forms are calculated by coupling the temperature distribution. Displacement is used to represent the mechanical action of skin caused by laser ultrasound. Results from numerical simulation are compared with other references; the accuracy of the method is proved accordingly. The results of simulation in the given conditions demonstrate that the stresses generated by pulse laser in human skin model were about −8 and +4 MPa. According to the results of simulation, the max and min stress are both emerged in the range of 0~600 um, that is exactly the location of myelinated Aδ and unmyelinated C nociceptor. The value of stress is can be adjusted by chose suitable parameters of laser. The study provides a possibility for developing a new non-lethal weapon to control riots or crowd.
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