Edge detection technique for experimental diagnosis in rocket motor

X-ray real time radiography (RTR) technique was used to study solid propellant combustion in U-type gas generator and double liquid elements nozzle spray flow field, and the RTR images were processed with edge detection technique. As the tested objects are of distinct edge gradation, auto-threshold technique and optimum filter methods were employed to improve image process effect in the simple edge detection technique. With these methods, the inner structure of chamber was viewed and the instantaneous combustion rate of solid propellant and ablation rate of insulated sheet were determined. The spraying angle and the particles distribution of spray flow field can be obtained in the same way.