Flame position ultrasonic interferometer

摘要

A sensitive instrument system for determining the position of the burn front in a rocket motor is disclosed. Separate adjacent transmitter and receiver elements are attached to the rocket motor casing to form an ultrasonic interference system. An ultrasound beam is transmitted to the motor's interior and the reflected beam from the propellant gas burn front is captured by the receiver. The received signal is processed to determine the distance to the propellant-gas interface.