CN109029506A - A kind of signal acquisition method and system - Google Patents
A kind of signal acquisition method and system Download PDFInfo
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- CN109029506A CN109029506A CN201810770094.9A CN201810770094A CN109029506A CN 109029506 A CN109029506 A CN 109029506A CN 201810770094 A CN201810770094 A CN 201810770094A CN 109029506 A CN109029506 A CN 109029506A
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D1/00—Measuring arrangements giving results other than momentary value of variable, of general application
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Abstract
The present invention provides a kind of signal acquisition method and system.This method includes to same measured point while carrying out the same measuring signal acquisition of n times, and carry out the initial value that processing obtains measuring signal to the signal of acquisition；N >=2 and n are integer；The same measuring signal of n times is carried out simultaneously to same measured point again according to the sampling period to acquire, and the current value that processing obtains measuring signal is carried out to the signal of acquisition；The change rate of the average value, average value of current value in the first set period of time, the second set period of time and third set period of time is calculated and be shown；It shows initial value and current value, repeats and obtain the later step of initial value.The signal acquisition method more accurately can comprehensively reflect the case where measuring signal, ensure that subsequent accuracy measuring signal processing and used, in the case where measuring signal is used for equipment condition monitoring, the accuracy rate of equipment condition monitoring can be improved, reduces the error rate of equipment state diagnosis.
Description
Technical field
The present invention relates to fields of communication technology, and in particular, to a kind of signal acquisition method and system.
Background technique
The status signal of one equipment or system includes the important information to its state recognition and fault diagnosis, to state
Signal accurately and reliably extract be fault diagnosis basis.In order to guarantee that equipment or system steadily and are safely run, it is necessary to quasi-
Really, the status signal of equipment or system is reliably acquired.Due to complicated or important equipment once because of failure rather than planned shut-down,
It will lead to serious loss, therefore complicated or important equipment generally all has matched state monitoring apparatus.In order to accurate and reliable
Ground is monitored equipment state, and it is accurate and reliable that the acquisition of equipment state signal is had to, not by the interference of noise.
Traditional signal acquisition method usually only passes through the status signal of a sensor measurement measurand, the standard of acquisition
True property and poor reliability, it cannot be guaranteed that the accuracy that follow-up signal is handled and used.In addition the working principle of sensor, manufacture work
The reasons such as skill, functional material, outside environmental elements, human factor can also generate error, cause measurement result inaccuracy and not
Reliably.Status signal it is inaccurate or unreliable, it is impossible to be accurately diagnosed to be the state of equipment, diagnostic error rate is higher.
Therefore, the accuracy and reliability for how ensuring to acquire signal in signal acquisition process has become urgently to be solved at present
Certainly the problem of.
Summary of the invention
The present invention is directed to the above-mentioned technical problems in the prior art, provides a kind of signal acquisition method and system.It should
Signal acquisition method can more accurate the case where comprehensively reflecting measuring signal, ensure that subsequent measuring signal processing and
The accuracy used can improve the accuracy rate of equipment condition monitoring in the case where measuring signal is used for equipment condition monitoring, drop
The error rate of low equipment state diagnosis.
The present invention provides a kind of signal acquisition method, comprising:
Step S10: carrying out the same measuring signal of n times simultaneously to same measured point and acquire, and to the signal of acquisition at
Reason obtains the initial value of the measuring signal；N >=2 and n are integer；
Step S11: the same measuring signal of n times is carried out simultaneously to the same measured point again according to the sampling period and is adopted
Collection, and the current value that processing obtains the measuring signal is carried out to the signal of acquisition；
Step S12: calculate change rate in the first set period of time of the average value, the average value of the current value,
The average value is in the change rate of change rate and the average value in third set period of time in the second set period of time；Institute
The first set period of time is stated less than second set period of time, second set period of time is less than the third setting time
Section；
Step S13: show the initial value, the current value, the average value, the average value in first setting
The change rate and the average value of change rate, the average value in second set period of time in period is described
Change rate in three set period of time；
Repeat the step S11~step S13.
Preferably, after the step S12 further include: whether the signal that judgement currently acquires is abnormal；If it is, alarm
And show abnormal signal state；If it is not, then display signal normal condition.
Preferably, as n=2, it is described judge the signal that currently acquires whether include: extremely
Calculate the absolute value of the difference of two current values；
Compare the setting the multiple whether absolute value is greater than the average value of the current value；
If it is, determining the abnormal signal currently acquired；If it is not, then determining that the signal currently acquired is normal.
Preferably, change rate of the average value in first set period of time
Wherein,For the average value of the current value；For to each institute before first set period of time
The average value for stating the current value of the measuring signal of sampling period acquisition is averaging the value obtained；
Change rate of the average value in second set period of time
Wherein,For the average value of the current value；For to each institute before second set period of time
The average value for stating the current value of the measuring signal of sampling period acquisition is averaging the value obtained；
Change rate of the average value in the third set period of time
Wherein,For the average value of the current value；For to each institute before the third set period of time
The average value for stating the current value of the measuring signal of sampling period acquisition is averaging the value obtained.
Preferably, the signal of described pair of acquisition, which handle, includes:
Analog-to-digital conversion is carried out to the signal of acquisition；
Signal after the analog-to-digital conversion is filtered；
The filtered signal is demarcated.
The present invention also provides a kind of signal acquiring systems, comprising:
Acquisition processing module is acquired for carrying out the same measuring signal of n times simultaneously to same measured point, and to the letter of acquisition
Number carry out the initial value that processing obtains the measuring signal；N >=2 and n are integer；And according to the sampling period again to same described
Measured point carries out the same measuring signal acquisition of n times simultaneously, and carries out processing to the signal of acquisition and obtain the measuring signal
Current value；
Computing module, for calculating the change of the average value, the average value of the current value in the first set period of time
Rate, the average value are in the variation of change rate and the average value in third set period of time in the second set period of time
Rate；First set period of time is less than second set period of time, and second set period of time is less than the third and sets
It fixes time section；
Display module, for showing the initial value, the current value, the average value, the average value described
The change rate and the average value of change rate, the average value in second set period of time in one set period of time exists
Change rate in the third set period of time.
It preferably, further include judgment module, whether the signal for judging currently to acquire is abnormal；
Alarm module, in the abnormal signal alarm currently acquired；
The display module is also used to show abnormal signal state and signal normal condition.
Preferably, the n=2, the judgment module include:
Computing unit, for calculating the absolute value of the difference of two current values；
Compare determination unit, the setting times of the average value of the current value whether is greater than for the absolute value
Number, and determine whether the signal currently acquired is abnormal according to comparison result.
Preferably, change rate of the average value in first set period of time
Wherein,For the average value of the current value；For to each institute before first set period of time
The average value for stating the current value of the measuring signal of sampling period acquisition is averaging the value obtained；
Change rate of the average value in second set period of time
Wherein,For the average value of the current value；For to each institute before second set period of time
The average value for stating the current value of the measuring signal of sampling period acquisition is averaging the value obtained；
Change rate of the average value in the third set period of time
Wherein,For the average value of the current value；For to each institute before the third set period of time
The average value for stating the current value of the measuring signal of sampling period acquisition is averaging the value obtained.
Preferably, the acquisition processing module includes:
Converting unit, for carrying out analog-to-digital conversion to the signal of acquisition；
Filter unit, for being filtered to the signal after the analog-to-digital conversion；
Unit is demarcated, for demarcating to the filtered signal.
Beneficial effects of the present invention: signal acquisition method provided by the present invention and system, by the signal to acquisition into
Row processing obtains change rate in the first set period of time of its initial value, current value, average value, average value, average value the
The change rate of change rate and average value in third set period of time in two set period of time, can be more accurate comprehensively anti-
The case where reflecting measuring signal ensures that subsequent accuracy measuring signal processing and used, and is used for equipment in measuring signal
In the case where status monitoring, the accuracy rate of equipment condition monitoring can be improved, reduces the error rate of equipment state diagnosis.
Detailed description of the invention
Fig. 1 is the flow chart of signal acquisition method in the embodiment of the present invention 1；
Fig. 2 is the flow chart of signal acquisition method in the embodiment of the present invention 2；
Fig. 3 is the flow chart of step S12 ' in the signal acquisition method of the embodiment of the present invention 2；
Fig. 4 is the functional block diagram of signal acquiring system in the embodiment of the present invention 3.
Description of symbols therein:
1. acquisition processing module；11. converting unit；12. filter unit；13. demarcating unit；2. computing module；3. display
Module；4. judgment module；41. computing unit；42. comparing determination unit；5. alarm module.
Specific embodiment
To make those skilled in the art more fully understand technical solution of the present invention, with reference to the accompanying drawing and it is embodied
Mode is described in further detail a kind of signal acquisition method provided by the present invention and system.
Embodiment 1:
The present embodiment provides a kind of signal acquisition methods, as shown in Figure 1, comprising:
Step S10: carrying out the same measuring signal of n times simultaneously to same measured point and acquire, and to the signal of acquisition at
Reason obtains the initial value of measuring signal；N >=2 and n are integer.
In the step, in order to carry out n times acquisition to same measuring signal simultaneously, n sensor is arranged a measured point,
Each sensor is used to acquire same measuring signal.
In the present embodiment, it is preferred that n=2.
Step S11: the same measuring signal of n times is carried out simultaneously to same measured point again according to the sampling period and is acquired, and is right
The signal of acquisition carries out the current value that processing obtains measuring signal.
In the step, if the frequency of measuring signal is f, sample frequency fs, 2f < fs<100kHz。
Step S12: change rate, the average value of the average value, average value of current value in the first set period of time are calculated and is existed
The change rate of change rate and average value in third set period of time in second set period of time.First set period of time is less than
Second set period of time, the second set period of time are less than third set period of time.
In the step, the average value of current value is to ask flat to the current value of all measuring signals in sampling period acquisition
?；Such as: the current value of the measuring signal of sampling period acquisition is Value1cAnd Value2c, then the average value of current value
Preferably, the first set period of time is 1 minute, and the second set period of time is 30 minutes, and third set period of time is 1
Hour.Certainly, each set period of time is not limited to above-mentioned value, and other values can also be with.
In the step, change rate of the average value in the first set period of timeIts
In,For the average value of current value；For the survey acquired to the sampling period each before the first set period of time
The average value for measuring the current value of signal is averaging the value obtained；Such as: the first set period of time is 1 minute, then average value was at 1 minute
Interior change rate To be adopted to each sampling period before 1 minute
The average value of the current value of the measuring signal of collection is averaging the value obtained.
Change rate of the average value in the second set period of timeWherein,For the average value of current value；For the measurement letter acquired to the sampling period each before the second set period of time
Number current value average value be averaging obtain value；Such as: the second set period of time is 30 minutes, then average value is in 30 minutes
Change rateFor to sampling week each before 30 minutes
The average value of the current value of the measuring signal of phase acquisition is averaging the value obtained.
Change rate of the average value in third set period of timeWherein,For the average value of current value；For the measurement letter acquired to the sampling period each before third set period of time
Number current value average value be averaging obtain value；Such as: third set period of time is 1 hour, then average value is in 1 hour
Change rate For the measurement to sampling period acquisition each before 1 hour
The average value of the current value of signal is averaging the value obtained.
In the present embodiment, change rate of the average value, average value of current value in the first set period of time, average value are
The change rate of change rate and average value in third set period of time in two set period of time can be more accurate comprehensively anti-
The case where reflecting measuring signal ensures that subsequent accuracy measuring signal processing and used, and is used for equipment in measuring signal
In the case where status monitoring, the accuracy rate of equipment condition monitoring can be improved, reduces the error rate of equipment state diagnosis.
Step S13: change rate in the first set period of time of display initial value, current value, average value, average value, flat
Mean value is in the change rate of change rate and average value in third set period of time in the second set period of time.
Repeat step S11~step S13.
Step S11~step S13 is repeated, it can be ensured that the measuring signal of each sampling period acquisition can obtain
Its current value, average value, average value in the first set period of time change rate, average value is in the second set period of time
The change rate of change rate and average value in third set period of time, so that it is guaranteed that the measuring signal of acquisition of each sampling period
The case where more accurately capable of comprehensively reflecting measuring signal, and then it is accurate to ensure that subsequent measuring signal is handled and used
Property, in the case where measuring signal is used for equipment condition monitoring, the accuracy rate of equipment condition monitoring can be improved, reduces equipment state
The error rate of diagnosis.
Signal acquisition method provided in embodiment 1, by the signal of acquisition carry out processing obtain its initial value, when
Preceding value, average value, average value are in the change rate of change rate, average value in the second set period of time in the first set period of time
With change rate of the average value in third set period of time, can more accurate the case where comprehensively reflecting measuring signal, thus
It ensures subsequent accuracy measuring signal processing and used, in the case where measuring signal is used for equipment condition monitoring, can mention
The accuracy rate of high equipment condition monitoring reduces the error rate of equipment state diagnosis.
Embodiment 2:
Based on signal acquisition method provided in embodiment 1, the present embodiment provides a kind of signal acquisition methods, such as Fig. 2
It is shown, comprising:
Step S10: carrying out the same measuring signal of n times simultaneously to same measured point and acquire, and to the signal of acquisition at
Reason obtains the initial value of the measuring signal；N >=2 and n are integer.
In the step, in order to carry out n times acquisition to same measuring signal simultaneously, n sensor is arranged a measured point,
Each sensor is used to acquire same measuring signal.
In the present embodiment, it is preferred that n=2.
Step S11: the same measuring signal of n times is carried out simultaneously to same measured point again according to the sampling period and is acquired, and is right
The signal of acquisition carries out the current value that processing obtains measuring signal.
In the step, if the frequency of measuring signal is f, sample frequency fs, 2f < fs<100kHz。
Step S12: change rate, the average value of the average value, average value of current value in the first set period of time are calculated and is existed
The change rate of change rate and average value in third set period of time in second set period of time.First set period of time is less than
Second set period of time, the second set period of time are less than third set period of time.
In the step, the average value of current value is to ask flat to the current value of all measuring signals in sampling period acquisition
?；Such as: the current value of the measuring signal of sampling period acquisition is Value1cAnd Value2c, then the average value of current value
Preferably, the first set period of time is 1 minute, and the second set period of time is 30 minutes, and third set period of time is 1
Hour.Certainly, each set period of time is not limited to above-mentioned value, and other values can also be with.
In the present embodiment, change rate of the average value, average value of current value in the first set period of time, average value are
The change rate of change rate and average value in third set period of time in two set period of time can be more accurate comprehensively anti-
The case where reflecting measuring signal ensures that subsequent accuracy measuring signal processing and used, and is used for equipment in measuring signal
In the case where status monitoring, the accuracy rate of equipment condition monitoring can be improved, reduces the error rate of equipment state diagnosis.
Step S13: change rate in the first set period of time of display initial value, current value, average value, average value, flat
Mean value is in the change rate of change rate and average value in third set period of time in the second set period of time.
Repeat step S11~step S13.
Step S11~step S13 is repeated, it can be ensured that the measuring signal of each sampling period acquisition can obtain
Its current value, average value, average value in the first set period of time change rate, average value is in the second set period of time
The change rate of change rate and average value in third set period of time, so that it is guaranteed that the measuring signal of acquisition of each sampling period
The case where more accurately capable of comprehensively reflecting measuring signal, and then it is accurate to ensure that subsequent measuring signal is handled and used
Property, in the case where measuring signal is used for equipment condition monitoring, the accuracy rate of equipment condition monitoring can be improved, reduces equipment state
The error rate of diagnosis.
The signal acquisition method is after step s 12 further include:
Step S12 ': whether the signal that judgement currently acquires is abnormal.If so, thening follow the steps S12 ": it alarms and in step
Abnormal signal state is shown in rapid S13.If it is not, then showing signal normal condition in step s 13.
The setting of step S12 ' and step S12 " can carry out warning note to the abnormal conditions of the signal currently acquired, with
Whether the signal of prompt acquisition can be used, to improve the accuracy of the signal of acquisition.
In the present embodiment, as shown in figure 3, as n=2, step S12 ' includes:
Step S120: the absolute value of the difference of two current values is calculated.
Step S121: compare the setting multiple whether absolute value is greater than the average value of current value.
Multiple is set in the step as 0.1 times, naturally it is also possible to be other multiples.
If so, i.e.It thens follow the steps S122: determining the letter currently acquired
Number exception.If not, thening follow the steps S123: determining that the signal currently acquired is normal.
In the present embodiment, carrying out processing to the signal of acquisition includes:
Analog-to-digital conversion is carried out to the signal of acquisition.
In the step, such as: signal (analog signal) S1 and S2 of acquisition is converted into number by 12 analog-digital converters
Measure (digital signal) ADC1 and ADC2.
Signal after analog-to-digital conversion is filtered.
In the step, filtering can be improved the accuracy of the signal of acquisition.Signal after analog-to-digital conversion is filtered
Specific algorithm are as follows: such as: the algorithm being filtered to ADC1 signal isADC2 is believed
Number algorithm being filtered isWherein, the power N of signal noises 2=(ADC1-
ADC2)2。
Filtered signal is demarcated.
In the step, calibration can be improved the accuracy of the signal of acquisition.Specific signal scaling process are as follows: selection coefficient
k1And k2, digital quantity ADCConValue1 and ADCConValue2 are demarcated, Value1=k1× ADCConValue1,
Value2=k2× ADCConValue2, wherein Value1 and Value2 is calibrated measured value.
In the present embodiment, in step S10, the Value1 and Value2 obtained after handling the signal of acquisition is as survey
Measure the initial value of signal.After step S10, after handling the signal of acquisition of each sampling period the Value1 that obtains and
Value2 is respectively as the current value of the measuring signal in each sampling period, i.e. Value1cAnd Value2c。
The beneficial effect of Examples 1 to 2, the signal acquisition method of offer described in Examples 1 to 2, passes through the letter to acquisition
It number carries out processing and obtains change rate, the average value of its initial value, current value, average value, average value in the first set period of time
It, can be more accurate comprehensive in the change rate of change rate and average value in third set period of time in the second set period of time
Ground reflects the case where measuring signal, ensures that subsequent accuracy measuring signal processing and used, is used in measuring signal
In the case where equipment condition monitoring, the accuracy rate of equipment condition monitoring can be improved, reduces the error rate of equipment state diagnosis.
Embodiment 3:
Based on signal acquisition method provided in embodiment 2, the present embodiment provides a kind of signal acquiring systems, such as Fig. 4
It is shown, comprising: acquisition processing module 1 is acquired for carrying out the same measuring signal of n times simultaneously to same measured point, and to acquisition
Signal carry out processing obtain measuring signal initial value；N >=2 and n are integer；And according to the sampling period again to same tested
It puts while carrying out the same measuring signal acquisition of n times, and the current value that processing obtains measuring signal is carried out to the signal of acquisition.It calculates
Module 2 is set for calculating change rate in the first set period of time of the average value, average value of current value, average value second
The change rate of change rate and average value in third set period of time fixed time in section.First set period of time is set less than second
It fixes time section, the second set period of time is less than third set period of time.Display module 3, for showing initial value, current value, putting down
Mean value, average value are in change rate of the change rate, average value in the first set period of time in the second set period of time and average
It is worth the change rate in third set period of time.
Wherein, change rate of the average value in the first set period of timeIts
In,For the average value of current value；For the survey acquired to the sampling period each before the first set period of time
The average value for measuring the current value of signal is averaging the value obtained.First set period of time is preferably 1 minute.
Change rate of the average value in the second set period of timeWherein,For the average value of current value；For the measurement letter acquired to the sampling period each before the second set period of time
Number current value average value be averaging obtain value.Second set period of time is preferably 30 minutes.
Change rate of the average value in third set period of timeWherein,For the average value of current value；For the measurement letter acquired to the sampling period each before third set period of time
Number current value average value be averaging obtain value.Third set period of time is preferably 1 hour.
By setting acquisition processing module 1, computing module 2 and display module 3, it can acquire and obtain the initial of measuring signal
Value, current value, average value, average value in the first set period of time change rate, average value is in the second set period of time
The change rate of change rate and average value in third set period of time, these data of measuring signal can more it is accurate comprehensively
The case where reflecting measuring signal ensures that subsequent accuracy measuring signal processing and used, in measuring signal for setting
In the case where standby status monitoring, the accuracy rate of equipment condition monitoring can be improved, reduces the error rate of equipment state diagnosis.
In the present embodiment, signal acquiring system further includes judgment module 4, and whether the signal for judging currently to acquire is different
Often.Alarm module 5, in the abnormal signal alarm currently acquired.Display module 3 be also used to show abnormal signal state and
Signal normal condition.
The setting of judgment module 4 and alarm module 5 can carry out warning note to the abnormal conditions of the signal currently acquired,
To prompt whether the signal of acquisition can be used, to improve the accuracy of the signal of acquisition.
Wherein, n=2, judgment module 4 includes: computing unit 41, for calculating the absolute value of the difference of two current values.Than
Compared with determination unit 42, the setting multiple for whether being greater than the average value of current value for comparing absolute value, and it is true according to comparison result
Whether the signal acquired before settled is abnormal.Preferably, multiple is set as 0.1 times.
In the present embodiment, acquisition processing module 1 includes: converting unit 11, for carrying out analog-to-digital conversion to the signal of acquisition.
Filter unit 12, for being filtered to the signal after analog-to-digital conversion.Unit 13 is demarcated, for marking to filtered signal
It is fixed.The setting of filter unit 12 and calibration unit 13, can be improved the accuracy of the signal of acquisition.
Embodiment 3 the utility model has the advantages that signal acquiring system provided by embodiment 3, pass through setting acquisition processing module, meter
Module and display module are calculated, the initial value for obtaining measuring signal, current value, average value, average value can be acquired in the first setting
Change rate, average value in period in the second set period of time change rate and average value in third set period of time
It the case where change rate, these data of measuring signal more accurately can comprehensively reflect measuring signal, ensures that subsequent
Accuracy measuring signal processing and used can improve equipment state in the case where measuring signal is used for equipment condition monitoring
The accuracy rate of monitoring reduces the error rate of equipment state diagnosis.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of signal acquisition method characterized by comprising
Step S10: it carries out the same measuring signal of n times simultaneously to same measured point and acquires, and processing is carried out to the signal of acquisition and is obtained
Obtain the initial value of the measuring signal；N >=2 and n are integer；
Step S11: carrying out the same measuring signal of n times simultaneously to the same measured point again according to the sampling period and acquire,
And the current value that processing obtains the measuring signal is carried out to the signal of acquisition；
Step S12: change rate in the first set period of time of the average value, the average value of the current value, described is calculated
Average value is in the change rate of change rate and the average value in third set period of time in the second set period of time；Described
One set period of time is less than second set period of time, and second set period of time is less than the third set period of time；
Step S13: show the initial value, the current value, the average value, the average value in first setting time
The change rate and the average value of change rate, the average value in second set period of time in section is set in the third
The change rate fixed time in section；
Repeat the step S11~step S 13.
2. signal acquisition method according to claim 1, which is characterized in that after the step S12 further include: judgement is worked as
Whether the signal of preceding acquisition is abnormal；If it is, alarming and showing abnormal signal state；If it is not, then the display normal shape of signal
State.
3. signal acquisition method according to claim 2, which is characterized in that as n=2, what the judgement currently acquired
Signal whether include: extremely
Calculate the absolute value of the difference of two current values；
Compare the setting the multiple whether absolute value is greater than the average value of the current value；
If it is, determining the abnormal signal currently acquired；If it is not, then determining that the signal currently acquired is normal.
4. signal acquisition method according to claim 1, which is characterized in that the average value is in first setting time
Change rate in sectionWherein,For the described average of the current value
Value；To work as described in the measuring signal to the sampling period acquisition each before first set period of time
The average value of preceding value is averaging the value obtained；
Change rate of the average value in second set period of timeWherein,For the average value of the current value；For to each sampling before second set period of time
The average value of the current value of the measuring signal of period acquisition is averaging the value obtained；
Change rate of the average value in the third set period of timeWherein,For the average value of the current value；For to each sampling before the third set period of time
The average value of the current value of the measuring signal of period acquisition is averaging the value obtained.
5. signal acquisition method according to claim 1, which is characterized in that the signal of described pair of acquisition carries out processing packet
It includes:
Analog-to-digital conversion is carried out to the signal of acquisition；
Signal after the analog-to-digital conversion is filtered；
The filtered signal is demarcated.
6. a kind of signal acquiring system characterized by comprising
Acquisition processing module is acquired for carrying out the same measuring signal of n times simultaneously to same measured point, and to the signal of acquisition into
Row processing obtains the initial value of the measuring signal；N >=2 and n are integer；And according to the sampling period again to same described tested
It puts while carrying out the same measuring signal acquisition of n times, and processing is carried out to the signal of acquisition and obtains working as the measuring signal
Preceding value；
Computing module, for calculate change rate in the first set period of time of the average value, the average value of the current value,
The average value is in the change rate of change rate and the average value in third set period of time in the second set period of time；Institute
The first set period of time is stated less than second set period of time, second set period of time is less than the third setting time
Section；
Display module, for showing that the initial value, the current value, the average value, the average value are set described first
Change rate and the average value of the change rate, the average value fixed time in section in second set period of time are described
Change rate in third set period of time.
7. signal acquiring system according to claim 6, which is characterized in that it further include judgment module, it is current for judging
Whether the signal of acquisition is abnormal；
Alarm module, in the abnormal signal alarm currently acquired；
The display module is also used to show abnormal signal state and signal normal condition.
8. signal acquiring system according to claim 7, which is characterized in that the n=2, the judgment module include:
Computing unit, for calculating the absolute value of the difference of two current values；
Compare determination unit, the setting multiple of the average value of the current value whether be greater than for the absolute value,
And determine whether the signal currently acquired is abnormal according to comparison result.
9. signal acquiring system according to claim 6, which is characterized in that the average value is in first setting time
Change rate in sectionWherein,For the described average of the current value
Value；To work as described in the measuring signal to the sampling period acquisition each before first set period of time
The average value of preceding value is averaging the value obtained；
Change rate of the average value in second set period of timeWherein,For the average value of the current value；For to each sampling before second set period of time
The average value of the current value of the measuring signal of period acquisition is averaging the value obtained；
Change rate of the average value in the third set period of timeIts
In,For the average value of the current value；For to each described before the third set period of time
The average value of the current value of the measuring signal of sampling period acquisition is averaging the value obtained.
10. signal acquiring system according to claim 6, which is characterized in that the acquisition processing module includes:
Converting unit, for carrying out analog-to-digital conversion to the signal of acquisition；
Filter unit, for being filtered to the signal after the analog-to-digital conversion；
Unit is demarcated, for demarcating to the filtered signal.
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