Space Radiation Sensor Analog Signal Processing And Analysis

With the rapid development of space technology,the characteristics of long life and high reliability of spacecraft are required.And the space radiation environment is the core element that restricts these requirements.Space radiation environment not only damages the electronic system of spacecraft,but also threatens the life safety of astronauts.Therefore,it is necessary to measure the space radiation environment.In order to achieve accurate and good measurement of space radiation environment,electronic system with high sampling rate,low noise and wide energy spectrum is indispensable.Therefore,electronic system is particularly important for analog signal acquisition and data processing of space radiation environment.In this paper,the space radiation sensor with plastic scintillator and silicon photomultiplier tube as the core can complete the collection,conversion,amplification,transmission,recording,analysis and processing of space radiation signals.The sensor can achieve a wide energy spectrum response and a wide energy response.In this paper,through simulating and testing Si PM work results in different grounding resistance with fraction charge reading detection technology.Our work has designed and preparated of the current feedback transresistance amplifiers,the amplifier gain is 20 d B,Bandwidth is 1GHz,slew rate is 5500V/?s.By estimating and testing the total output voltage after the preamplifier,the noise in 2 mv level,and this paper gives two kinds of preamplifier scheme that can meet the different needs.The FOM of fraction charge readout signal is enhanced.With the pole zero cancellation technology,the time performance is improved.In this paper,it is verified that under the fraction charge working mode,the fast signal of fraction charge readout can achieve better particle resolution while having good timing performance.After studying the influence of gates of long and short,which change FOM.Through the optimization of gates of long and short the FOM value can be enhanced to 1.108(long gate:250ns,short gate:40ns),which is close to the result of using standard output signal under the same test conditions.Secondly,FOM values were calculated by selecting multiple gates of long and short.The results were fitted to continuous 3D images.Then,by projecting the results onto a two-dimensional plane,the contour map of FOM in different gates of long and short was obtained.Compared with the previous standard output signal,the fast signal has two peaks in the contour map.The first peak value is greater than 300 ns in the long gate,and 0~5ns in the short gate.The second is in long gate 200~300ns,short gate 30~50ns.Since the first peak requires more long gate that includes more noise,the first peak is less than the second peak.The second requires shorter long gate,which is more suitable for calculating the FOM.However,under the same test condition,there is only one peak on the FOM two-dimensional contour map of the standard output signal.Finally,the zero-pole cancellation circuit combined with fraction charge circuit can reduce the pulse time width to the level of 50 ns,further improve the signal time performance,and can still achieve particle identification,but the FOM value has declined,which can be applied to the detection system with high count rate.