Adaptive Control And Sensitivity Calibration Technology For Flame Trigger

Flame trigger is mainly used to detect the instantaneous flame produced by barrel weapon projectile or the fire produced by air explosive ammunition,to output synchronous trigger signal in real time,and to trigger the ballistic test equipment to start working.It has been widely used in the process of weapon test.The following problems still exist in practical engineering application:First,the dynamic range of detection sensitivity is small,flame triggers are prone to signal saturation output wrong trigger signal or no signal output problems in different test situations,which results in test failure.Second,there is no quantitative evaluation index for the detection sensitivity of flame trigger,so the detection performance of flame trigger cannot be evaluated effectively.In order to solve the above problems,an adaptive signal processing circuit for the flame trigger is designed based on the amplitude characteristics of the input signal,which broadens the dynamic range of the detection sensitivity of the flame trigger.At the same time,a calibration method for the detection sensitivity of the flame trigger is also studied in this paper.The research includes the following four aspects:Firstly,the overall design scheme of flame trigger is put forward.The spectral characteristics and signal frequency characteristics of muzzle flame are analyzed.The design scheme of flame trigger is determined and the optoelectronic detection subsystem device selection is completed.The visible light interference is filtered by infrared filter,which improves the reliability of trigger.Secondly,the adaptive signal processing circuit is designed.The signal processing circuit adaptively amplifies according to the amplitude characteristics of the input signal,It is realized by multiplying and dividing.The peak value of the input signal is collected by the peak acquisition circuit,and the control voltage is obtained by dividing the set value from the peak signal.The control voltage is multiplied by the input signal to realize the adaptive amplification of the input signal.Thirdly,the detection sensitivity model of flame trigger is established.The working mechanism of the flame trigger is analyzed.The detection sensitivity of the flame trigger is expressed by the relative change of the minimum light flux,and the corresponding detection sensitivity model is established.Finally,a calibration method of flame trigger detection sensitivity is proposed.Building an experimental platform,The artificially designed light source is used to simulate the flame of 7.62mm caliber gun when it fires projectiles.By changing the luminous intensity and detection distance of artificial light source,the amplitude variation of analog signal output from flame trigger is studied,and the sensitivity description method of flame trigger is proposed quantitatively.The experimental results show that the output signal of the current stage circuit is in the range of 100mV-500mV,the output signal amplitude of the adaptive signal processing circuit can be stabilized at 5V,and the signal amplitude error is less than 5%.The calibration method of detection sensitivity is accurate and feasible.