关键词: 激光推进;复摆;多脉冲;冲量耦合系数;测量模式

Abstract: A measuring method of multiple-pulse impulse coupling coefficient based on compound pendulum model was presented,in which a laser pulse extracting and a pendulum controlling unit was added to the single-pulse impulse measurement system.Two multiple-pulse measurement patterns and their implementation procedure were analyzed.Then new problems of data processing for the maximal angle were solved.Finally,the multiple-pulse measuring method was tested.Results indicate that the design of the laser pulse extractor and pendulum controller meets the 25Hz frequency requirement and any pulse in the multiple-pulse sequence can be extracted within the pulse interval of 40ms;As to a analog multiple-pulse sequence,the impulse coupling coefficients in both measurement patterns coincided well with each other,which ranged between 371.0 N/WM and 375.3 N/MW with a 15-degree conical nozzle.The measuring method can be applied in the study of multiple-pulse performance in air-breathing laser propulsion and it can work as a complement for other multiple-pulse research methods.

Key words: Laser propulsion;Compound pendulum;Multiple pulses;Impulse coupling coefficient;Measurement pattern