High speed photography measurement of impulse coupling coefficient based on compound pendulum model

Based on compound pendulum model, a new way is put forward to measure impulse coupling coefficient using high speed photography. The system parameters of the compound pendulum are demarcated by an encoder when impulse is loaded slowly, and after the pulsed laser impacting the pendulum, the maximum angle is measured by CCD camera when impulse is loaded instantaneously, which efficiently solves the problem that the encoder can not distinguish angles due to vibration in the experiment. The result shows that the relative error of demarcating system parameter is below 2%. The results of impulse coupling coefficient have good repeatability with the range of (32.3～32.9)×10-5 N·s·J-1, which is consistent with the data reported by foreign authors for similar laser thruster.