high speed video and images
The device fabricated using the parameter values obtained from the parametric analysis is tested for its performance by applying an impulse load through a spring manipulator, and the device response is captured using a PHOTRON high speed camera. When the manipulator is pulled down and released, the stage impacts a stationary wall causing a shock impulse, the magnitude of the impact can be controlled by the length through which the manipulator is pulled back. The acceleration impulse data is recorded using a Polytec point measurement vibrometer, by pointing the laser beam on the tip of the spring manipulator. To start the camera and the vibrometer at the same time, a 5V TTL pulse signal is fed to the vibrometer from the camera that triggers the vibrometer on starting the high speed camera. Now, we have frame sync between the camera and the vibrometer, which marks the zero time of reference. The camera captures 20,000 frames per second, which is good enough to capture the impact event and the dynamics of the device. The response data from the high speed camera is then processed using the image processing toolbox in MATLAB to get the experimental device response. The acceleration profile recorded by the laser vibrometer is used in the simulation of the device response using the analytical method . The impulse data recorded by the vibrometer is given as the acceleration profile that is used in obtaining the analytical solution.