A circuit and method for measuring ignition delay time of solid propellant

Abstract

The invention belongs to the field of solid propellants, in particular to a circuit and method for measuring the ignition delay time of solid propellants. After the circuit for measuring the time of the laser signal and the circuit for measuring the time of the flame signal are connected in parallel, the data acquisition card and the computer test software are connected in sequence. Both the circuit for measuring the time of the laser signal and the circuit for measuring the time of the flame signal include a photosensitive diode and a reverse bias operational amplifier circuit. The two photosensitive diodes of this application are respectively connected to the laser tube and the combustion chamber. When the photodiode receives the signal and generates a voltage, the voltage is output through the amplifying circuit. The voltage is collected by the data acquisition card and output to the measurement software of the computer, and the two The time difference of the rising edge of the signal is the ignition delay time of the solid propellant. The entire measurement process of this application is carried out spontaneously by the system, two voltage signals are recorded on the same time axis, and two photodiodes of the same type are selected, which has high measurement accuracy.

Description

technical field [0001] The invention belongs to the field of solid propellants, in particular to a circuit and a method for measuring the ignition delay time of solid propellants. Background technique [0002] Ignition of solid propellant is a process in which the local surface temperature of solid propellant rises above the ignition point under the action of energy, and starts to burn there, and further spreads to the burning surface of the entire charge to make it burn. The research on the ignition performance of solid propellant began in the 1960s, and it is one of the main contents of internal ballistic research, which is of great significance for the propulsion application and the revealing of the combustion mechanism. [0003] "Xu Haoxing et al. Research on the delay time of laser ignition of butylated hydroxy propellant [J]. Solid Rocket Technology, 2000(01): 43-46" mentioned a method by turning on CO 2 The laser igniter uses a high-sensitivity photodiode to convert ...

AI Technical Summary

Problems solved by technology

Although this method can also measure the ignition delay time of the propellant, the measurement accuracy is limited by the frame rate of the video equipment, and the error of the two frames of the first light of the LED and the initial flame produced by the propellant is relatively large through human judgment.

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