Signal acquisition device based on experiments of laser-induced ignition of solid propellants

Abstract

The invention discloses a signal acquisition device based on experiments of laser-induced ignition of solid propellants. The signal acquisition device comprises image recording equipment, a light-emitting diode, a flame photodiode, a laser photodiode, an amplifying circuit and a data acquisition card, wherein the laser photodiode is close to the wall of a laser tube; the flame photodiode is arranged outside a view window of a combustion chamber and is in positional correspondence with the view window; an input end of the amplifying circuit is connected with the laser photodiode, and an output end of the amplifying circuit is connected with the light-emitting diode; the light-emitting diode is arranged in a photographable visual angle of the image recording equipment, and the image recording equipment is arranged outside the view window of the combustion chamber and is in positional correspondence with the view window; a signal input end of the data acquisition card is connected with the laser photodiode and the flame photodiode. The signal acquisition device is simple in principle, high in precision and reasonable in cost and is convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of signal testing and research, in particular to a signal acquisition device based on a solid propellant laser ignition experiment. Background technique [0002] The traditional solid propellant ignition generally adopts an igniter equipped with igniting powder, uses an electrode to detonate the igniting powder in the igniter, and takes the moment when the power switch is turned on to energize the electrode as the initial moment. The research on the ignition of solid propellants under laser irradiation began in the 1960s. Due to the novelty of the ignition method, the traditional method of measuring the ignition delay time is no longer applicable. The measurement of the ignition delay time in the laser ignition experiment is to take the moment when the gas in the laser tube emits laser light after the voltage is broken down as the initial moment. In the large amount of literature on laser ignition, there is...

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Problems solved by technology

The disadvantage of this method is that the measurement accuracy is limited by the frame rate of the video equipment, and the two-frame images of the initial moment of LED light emission and the initial moment of solid propellant ignition are obtained through human judgment, and the error is relatively large.

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