CN115545064B - Pulse signal accumulation identification method - Google Patents
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Abstract
The invention discloses a pulse signal accumulation identification method, which comprises the following steps: 1. pulse signal filtering forming and establishing a signal pipeline; 2. setting two sampling points which are arranged at intervals; 3. setting a slope change rule of pulse signals without accumulation after trapezoidal filtering forming, and calculating a pulse signal baseline value and an amplitude value; 4. pulse signal accumulation identification. The method meets the instant requirement of identifying and judging the pulse signal accumulation, and on the assembly line of the pulse signal after filtering and forming, the method not only can identify accumulation conditions with different degrees, immediately give out judgment results, but also can calculate the baseline value and the amplitude value of the pulse signal, and has more excellent calculation performance.
Description
Technical Field
The invention belongs to the technical field of pulse signal accumulation identification, and particularly relates to a pulse signal accumulation identification method.
Background
Due to randomness of nuclear radiation decay, nuclear pulse signals can be piled up to different degrees, so that effective pile-up identification is realized, and the resolution performance of acquired energy spectrum is improved. Currently, with the progress of signal processing technology and computer science, the advantage of digitally processing pulse signals is reflected, and real-time signal acquisition and processing also become the necessary trend of future development. However, for different stacking situations, different judging methods are needed, so that the signal processing speed is reduced and the dead time in the signal processing process is increased in the process of algorithm implementation. Therefore, a method for instantly judging the accumulation of pulse signals is needed.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides a pulse signal accumulation identification method which meets the instant requirement on pulse signal accumulation identification judgment.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for identifying pulse signal pile-up, the method comprising the steps of:
step one, pulse signal filtering shaping and signal pipeline establishment: performing trapezoidal filtering forming on the nuclear pulse signal and establishing a signal pipeline;
step two, setting two sampling points which are distributed at intervals: setting two sampling points a and b which are arranged at intervals, wherein the sampling point a is behind the sampling point b, and the width between the sampling point a and the sampling point b is smaller than the width of a trapezoid flat top;
wherein the sampling point a is behind the sampling point b by M sampling moments, and M is a positive integer;
step three, a slope change rule of pulse signals without accumulation after the trapezoidal filter forming is given, and a pulse signal baseline value and an amplitude value are calculated: when pulse signals are not piled up, the slope K value of a straight line formed by connecting the sampling point a and the sampling point b rises firstly, when K is larger than a set first slope threshold value, the rising edge of a trapezoidal signal is judged to come, N values are overlapped with the value of the sampling point a at the moment, the average value of the current overlapped value is calculated, and the baseline value of the pulse signals is determined, wherein N is not larger than a positive integer of M;
when the K value is zero again, judging that the flat top position of the trapezoidal signal comes, starting to superimpose N values with the value at the moment of the sampling point a, calculating the average value of the current superimposed value, calculating the peak value of the pulse signal, and taking the difference value between the peak value and the baseline value as the amplitude value of the pulse signal;
when the K value is smaller than zero, judging that the falling edge of the trapezoidal signal arrives;
judging that the trapezoidal signal is ended when the K value is zero again;
fourth, pulse signal accumulation identification:
when the slope K value of a straight line formed by connecting the sampling point a and the sampling point b rises firstly, then tends to zero, is smaller than zero, and is larger than zero, at the moment, pulse signal accumulation is judged, and the pulse signal accumulation is of a first pulse signal accumulation type;
when the pulse time interval after the trapezoidal shaping of the pulse signal is equal to the sum of the rising time and the flat-top time, when the K value tends to zero for the second time, the values of the sampling point a and the sampling point b are both larger than zero, and then pulse signal accumulation is judged, wherein the pulse signal accumulation is of a pulse signal second accumulation type;
when the pulse time interval after the trapezoidal shaping of the pulse signal is smaller than the sum of the rising time and the flat-top time and is larger than the rising time, judging that the pulse signal is piled up when the flat-top is not recognized according to the K value change, wherein the pulse signal is piled up to be of a third pile type of the pulse signal;
when the pulse time interval after trapezoidal shaping of the pulse signals is equal to the rising time, if the amplitude of two adjacent pulse signals is equal, when a flat top can be identified according to the K value change, starting to calculate data points after the flat top is finished at the moment by using the sampling point a, and if the pulse time interval is larger than the flat top time of a single trapezoidal pulse signal, judging that the pulse signals are piled up; when the two pulse amplitudes are unequal, no flat top is identified, and pulse signal accumulation is directly judged, wherein the pulse signal accumulation is of a fourth pulse signal accumulation type;
when the pulse time interval after the trapezoidal shaping of the pulse signals is smaller than the rising time and larger than the flat-top time, when the two pulse amplitudes are unequal, the variation of the rising edge and the falling edge of the K value will fluctuate, and if the variation exceeds a preset second slope threshold value, the pulse signals are judged to be piled up; when the two pulse amplitudes are equal, a flat top can be identified according to the K value change, but the rising edge and the falling edge are fluctuated and exceed a preset second slope threshold value, pulse signal accumulation is judged, and the pulse signal accumulation is of a fifth pulse signal accumulation type;
when the pulse time interval after the trapezoidal shaping of the pulse signal is smaller than or equal to the flat-top time, the variation of the rising edge and the falling edge of the K value will be fluctuated, and no flat-top time exists, the pulse signal accumulation is judged, and the pulse signal accumulation is of a sixth accumulation type of the pulse signal.
The pulse signal accumulation identification method is characterized by comprising the following steps of: the nuclear pulse signal is a double-exponential pulse signal.
The pulse signal accumulation identification method is characterized by comprising the following steps of: the first pile-up type of the pulse signals is pulse signal front edge pile-up.
The pulse signal accumulation identification method is characterized by comprising the following steps of: the first slope threshold is smaller than the rising edge slope of the trapezoidal signal, and the second slope threshold is larger than the rising edge slope of the trapezoidal signal.
Compared with the prior art, the invention has the following advantages:
1. the invention filters and shapes the double-index pulse signal, filters high-frequency noise, eliminates long trailing of the double-index signal, and is convenient for popularization and use.
2. The invention sets two sampling points which are arranged at intervals, namely, the sampling point a and the sampling point b, the sampling point a is behind the sampling point b, the width between the sampling point a and the sampling point b is smaller than the width of a trapezoid flat top, the slope K change of a straight line formed by connecting the two points is detected, when the stacking conditions are different, the slope change of the two points can correspondingly change, and the slope K change is used as a basis for judging the stacking conditions of pulse signals, and the invention is reliable and stable and has good use effect.
3. The method has simple steps, when pulse signals are not piled up, the slope K value of a straight line formed by connecting the sampling point a and the sampling point b rises firstly, when K is larger than a set first slope threshold value, the rising edge of a trapezoidal signal is judged to come, N values are overlapped with the value of the sampling point a at the moment, the average value of the current overlapped value is calculated, so that the baseline value of the pulse signals is determined, the calculation amount of a computer is reduced, the waste of resources is avoided, and meanwhile, the calculation result is reliable; when the K value is zero again, judging that the flat top position of the trapezoidal signal comes, starting to superimpose N values with the value at the moment of the sampling point a, calculating the average value of the current superimposed value, calculating the peak value of the pulse signal, and taking the difference value between the peak value and the baseline value as the amplitude value of the pulse signal; the calculation performance is excellent, and the popularization and the use are convenient.
In summary, the method meets the requirement of instant accumulation identification and judgment of the pulse signals, and on the assembly line of the pulse signals after filtering and forming, the method not only can identify accumulation conditions of different degrees, immediately give out judgment results, but also can calculate the baseline value and amplitude value of the pulse signals, has more excellent calculation performance and is convenient to popularize and use.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
Fig. 1 is a waveform diagram of the pulse signal of the present invention when no pile-up occurs.
Fig. 2 is a waveform diagram of a first pile-up type of pulse signal according to the present invention.
FIG. 3 is a waveform diagram of a second and third pile-up type of pulse signal according to the present invention.
Fig. 4 is a waveform diagram of a fourth pile-up type of pulse signal according to the present invention.
Fig. 5 is a waveform diagram of a fifth stacking type of pulse signals stacked as pulse signals according to the present invention.
Fig. 6 is a waveform diagram of a sixth pile-up type of pulse signal according to the present invention.
Fig. 7 is a flow chart of the method of the present invention.
Detailed Description
As shown in fig. 1 to 7, a pulse signal accumulation recognition method of the present invention includes the steps of:
step one, pulse signal filtering shaping and signal pipeline establishment: performing trapezoidal filtering forming on the nuclear pulse signal and establishing a signal pipeline;
step two, setting two sampling points which are distributed at intervals: setting two sampling points a and b which are arranged at intervals, wherein the sampling point a is behind the sampling point b, and the width between the sampling point a and the sampling point b is smaller than the width of a trapezoid flat top;
wherein the sampling point a is behind the sampling point b by M sampling moments, and M is a positive integer;
step three, a slope change rule of pulse signals without accumulation after the trapezoidal filter forming is given, and a pulse signal baseline value and an amplitude value are calculated: when pulse signals are not piled up, the slope K value of a straight line formed by connecting the sampling point a and the sampling point b rises firstly, when K is larger than a set first slope threshold value, the rising edge of a trapezoidal signal is judged to come, N values are overlapped with the value of the sampling point a at the moment, the average value of the current overlapped value is calculated, and the baseline value of the pulse signals is determined, wherein N is not larger than a positive integer of M;
when the K value is zero again, judging that the flat top position of the trapezoidal signal comes, starting to superimpose N values with the value at the moment of the sampling point a, calculating the average value of the current superimposed value, calculating the peak value of the pulse signal, and taking the difference value between the peak value and the baseline value as the amplitude value of the pulse signal;
when the K value is smaller than zero, judging that the falling edge of the trapezoidal signal arrives;
judging that the trapezoidal signal is ended when the K value is zero again;
fourth, pulse signal accumulation identification:
when the slope K value of a straight line formed by connecting the sampling point a and the sampling point b rises firstly, then tends to zero, is smaller than zero, and is larger than zero, at the moment, pulse signal accumulation is judged, and the pulse signal accumulation is of a first pulse signal accumulation type;
when the pulse time interval after the trapezoidal shaping of the pulse signal is equal to the sum of the rising time and the flat-top time, when the K value tends to zero for the second time, the values of the sampling point a and the sampling point b are both larger than zero, and then pulse signal accumulation is judged, wherein the pulse signal accumulation is of a pulse signal second accumulation type;
when the pulse time interval after the trapezoidal shaping of the pulse signal is smaller than the sum of the rising time and the flat-top time and is larger than the rising time, judging that the pulse signal is piled up when the flat-top is not recognized according to the K value change, wherein the pulse signal is piled up to be of a third pile type of the pulse signal;
when the pulse time interval after trapezoidal shaping of the pulse signals is equal to the rising time, if the amplitude of two adjacent pulse signals is equal, when a flat top can be identified according to the K value change, starting to calculate data points after the flat top is finished at the moment by using the sampling point a, and if the pulse time interval is larger than the flat top time of a single trapezoidal pulse signal, judging that the pulse signals are piled up; when the two pulse amplitudes are unequal, no flat top is identified, and pulse signal accumulation is directly judged, wherein the pulse signal accumulation is of a fourth pulse signal accumulation type;
when the pulse time interval after the trapezoidal shaping of the pulse signals is smaller than the rising time and larger than the flat-top time, when the two pulse amplitudes are unequal, the variation of the rising edge and the falling edge of the K value will fluctuate, and if the variation exceeds a preset second slope threshold value, the pulse signals are judged to be piled up; when the two pulse amplitudes are equal, a flat top can be identified according to the K value change, but the rising edge and the falling edge are fluctuated and exceed a preset second slope threshold value, pulse signal accumulation is judged, and the pulse signal accumulation is of a fifth pulse signal accumulation type;
when the pulse time interval after the trapezoidal shaping of the pulse signal is smaller than or equal to the flat-top time, the variation of the rising edge and the falling edge of the K value will be fluctuated, and no flat-top time exists, the pulse signal accumulation is judged, and the pulse signal accumulation is of a sixth accumulation type of the pulse signal.
The method is characterized in that the double-index pulse signal is subjected to filter forming, high-frequency noise is filtered, and long trailing of the double-index signal is eliminated; setting two sampling points which are arranged at intervals, namely a sampling point a and a sampling point b, wherein the sampling point a is behind the sampling point b, the width between the sampling point a and the sampling point b is smaller than the width of a trapezoid flat top, detecting the slope K change of a straight line formed by connecting the two points, and when the stacking conditions are different, correspondingly changing the slope change of the two points to be used as a basis for judging the stacking conditions of pulse signals, thereby being reliable and stable; when pulse signals are not piled up, the slope K value of a straight line formed by connecting the sampling point a and the sampling point b rises firstly, when K is larger than a set first slope threshold value, the rising edge of a trapezoidal signal is judged to come, N values are overlapped with the value of the sampling point a at the moment, the average value of the current overlapped value is calculated, the baseline value of the pulse signals is determined, the operation amount of a computer is reduced, resources are avoided being wasted, and meanwhile, the calculation result is reliable; when the K value is zero again, judging that the flat top position of the trapezoidal signal comes, starting to superimpose N values with the value at the moment of the sampling point a, calculating the average value of the current superimposed value, calculating the peak value of the pulse signal, and taking the difference value between the peak value and the baseline value as the amplitude value of the pulse signal; the calculation performance is excellent.
In this embodiment, the core pulse signal is a double-exponential pulse signal.
In this embodiment, the first pile-up type of the pulse signal is pile-up of leading edges of the pulse signal.
In this embodiment, the first slope threshold is smaller than the rising edge slope of the trapezoidal signal, and the second slope threshold is larger than the rising edge slope of the trapezoidal signal.
When the invention is used, the pulse signal is subjected to filter forming treatment, and the distance between the sampling point a and the sampling point b is wide enough and smaller than the trapezoid flat top, so that the K value is basically kept near 0 before the pulse signal arrives, as shown in figure 1;
the sampling point b firstly enters a rising edge along with the time, the slopes of the sampling point a and the sampling point b start to increase, when the slope is larger than a set first slope threshold value, the sampling point a is used as a reference for superposition, and when the slope of a straight line formed by connecting the sampling point a and the sampling point b is close to the slope of the rising edge, the average value is taken to determine the baseline value of the pulse signal;
after the rising edge is finished, the K value is gradually reduced, when the trapezoid is started to enter a flat top, stacking is started by taking the sampling point a as a reference, N values are started to be stacked by taking the value at the moment of the sampling point a, the average value of the current stacking value is calculated, the peak value of the pulse signal is calculated, and the difference value between the peak value and the baseline value is used as the amplitude value of the pulse signal;
after the falling edge is finished, the K value tends to zero, and the values of the sampling point a and the sampling point b are all near 0, so that the pulse signal is judged to be finished;
when the pulse signals are piled up, the K value, the flat top width, the values of the sampling point a and the sampling point b are expressed in different forms:
when the leading edge accumulation occurs in the pulse signals, and the K value is towards 0 for the second time, the values of the sampling point a and the sampling point b are both larger than 0, and the accumulation is judged to occur, as shown in fig. 2;
when the pulse interval is smaller than the sum of the rising time and the flat-top time and is larger than the rising time, if the first pulse amplitude is smaller than the second pulse amplitude, the K value is larger than 0 when the flat-top of the first trapezoidal signal is finished; if the first pulse amplitude is larger than the second pulse amplitude, the K value is smaller than 0 when the flat top of the first trapezoid model is finished; if the first pulse amplitude is equal to the second pulse amplitude, the K value is equal to 0 at the end of the flat top of the first trapezoid model, and the flat top width is twice the flat top width without accumulation; fig. 3 lists the case when the first amplitude is smaller than the second pulse amplitude;
when the pulse interval is equal to the rising time, if the two pulse amplitudes are equal, a flat top is identified according to the K value, counting is carried out based on the sampling point a, and when the acquired flat top width is larger than the flat top width under the condition of no accumulation, the accumulation is judged; if the two pulse amplitudes are different, no flat top is identified, and the stacking is directly judged; fig. 4 lists the case when the two pulse amplitudes are equal;
when the pulse interval is smaller than the rising time and larger than the flat top width, if the two pulse amplitudes are equal, the flat top can be identified according to the change of the K value, but in a certain time period between the rising edge and the falling edge, the K value can be greatly deviated; if the two pulse amplitudes are not equal, no flat top is identified according to the K value change, and the accumulation is directly judged; fig. 5 lists the case where the two pulses are equal in amplitude;
when the pulse interval is smaller than the plateau width, the plateau cannot be identified according to the K value change, and the occurrence of accumulation is directly judged as shown in fig. 6.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (4)
1. A method for identifying pulse signal pile-up, the method comprising the steps of:
step one, pulse signal filtering shaping and signal pipeline establishment: performing trapezoidal filtering forming on the nuclear pulse signal and establishing a signal pipeline;
step two, setting two sampling points which are distributed at intervals: setting two sampling points a and b which are arranged at intervals, wherein the sampling point a is behind the sampling point b, and the width between the sampling point a and the sampling point b is smaller than the width of a trapezoid flat top;
wherein the sampling point a is behind the sampling point b by M sampling moments, and M is a positive integer;
step three, a slope change rule of pulse signals without accumulation after the trapezoidal filter forming is given, and a pulse signal baseline value and an amplitude value are calculated: when pulse signals are not piled up, the slope K value of a straight line formed by connecting the sampling point a and the sampling point b rises firstly, when K is larger than a set first slope threshold value, the rising edge of a trapezoidal signal is judged to come, N values are overlapped with the value of the sampling point a at the moment, the average value of the current overlapped value is calculated, and the baseline value of the pulse signals is determined, wherein N is not larger than a positive integer of M;
when the K value is zero again, judging that the flat top position of the trapezoidal signal comes, starting to superimpose N values with the value at the moment of the sampling point a, calculating the average value of the current superimposed value, calculating the peak value of the pulse signal, and taking the difference value between the peak value and the baseline value as the amplitude value of the pulse signal;
when the K value is smaller than zero, judging that the falling edge of the trapezoidal signal arrives;
judging that the trapezoidal signal is ended when the K value is zero again;
fourth, pulse signal accumulation identification:
when the slope K value of a straight line formed by connecting the sampling point a and the sampling point b rises firstly, then tends to zero, is smaller than zero, and is larger than zero, at the moment, pulse signal accumulation is judged, and the pulse signal accumulation is of a first pulse signal accumulation type;
when the pulse time interval after the trapezoidal shaping of the pulse signal is equal to the sum of the rising time and the flat-top time, when the K value tends to zero for the second time, the values of the sampling point a and the sampling point b are both larger than zero, and then pulse signal accumulation is judged, wherein the pulse signal accumulation is of a pulse signal second accumulation type;
when the pulse time interval after the trapezoidal shaping of the pulse signal is smaller than the sum of the rising time and the flat-top time and is larger than the rising time, judging that the pulse signal is piled up when the flat-top is not recognized according to the K value change, wherein the pulse signal is piled up to be of a third pile type of the pulse signal;
when the pulse time interval after trapezoidal shaping of the pulse signals is equal to the rising time, if the amplitude of two adjacent pulse signals is equal, when a flat top can be identified according to the K value change, starting to calculate data points after the flat top is finished at the moment by using the sampling point a, and if the pulse time interval is larger than the flat top time of a single trapezoidal pulse signal, judging that the pulse signals are piled up; when the two pulse amplitudes are unequal, no flat top is identified, and pulse signal accumulation is directly judged, wherein the pulse signal accumulation is of a fourth pulse signal accumulation type;
when the pulse time interval after the trapezoidal shaping of the pulse signals is smaller than the rising time and larger than the flat-top time, when the two pulse amplitudes are unequal, the variation of the rising edge and the falling edge of the K value will fluctuate, and if the variation exceeds a preset second slope threshold value, the pulse signals are judged to be piled up; when the two pulse amplitudes are equal, a flat top can be identified according to the K value change, but the rising edge and the falling edge are fluctuated and exceed a preset second slope threshold value, pulse signal accumulation is judged, and the pulse signal accumulation is of a fifth pulse signal accumulation type;
when the pulse time interval after the trapezoidal shaping of the pulse signal is smaller than or equal to the flat-top time, the variation of the rising edge and the falling edge of the K value will be fluctuated, and no flat-top time exists, the pulse signal accumulation is judged, and the pulse signal accumulation is of a sixth accumulation type of the pulse signal.
2. A pulse signal pile-up identification method as defined in claim 1, wherein: the nuclear pulse signal is a double-exponential pulse signal.
3. A pulse signal pile-up identification method as defined in claim 1, wherein: the first pile-up type of the pulse signals is pulse signal front edge pile-up.
4. A pulse signal pile-up identification method as defined in claim 1, wherein: the first slope threshold is smaller than the rising edge slope of the trapezoidal signal, and the second slope threshold is larger than the rising edge slope of the trapezoidal signal.
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