CN103105183A - Data collection system and data collection method - Google Patents
Data collection system and data collection method Download PDFInfo
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- CN103105183A CN103105183A CN2013100282056A CN201310028205A CN103105183A CN 103105183 A CN103105183 A CN 103105183A CN 2013100282056 A CN2013100282056 A CN 2013100282056A CN 201310028205 A CN201310028205 A CN 201310028205A CN 103105183 A CN103105183 A CN 103105183A
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Abstract
The invention relates to a data collection system and a data collection method. The data collection system comprises a filtration module, a counting model and a data communication module. The filtration module is used for obtaining a first impulse frequency of a grating according to groove density of the grating under the highest moving speed, and filtering the impulses with impulse frequencies higher than the first impulse frequency as interfering impulses to obtain two-phase pulse signals after filtering. The counting module is used for judging the moving direction of the grating according to the two-phase pulse signals after filtering, counting the two-phase pulse signals after filtering according to the moving direction, and obtaining a counting result. The data communication module is used for transmitting the counting result into a data processing chip outside the data collection system under the triggering of clock signals. The data collection system and the data collection method guarantee the measurement accuracy of the data collection system by effectively eliminating the influences to the counting by the interfering impulses.
Description
Technical field
The present invention relates to the data acquisition technology field, particularly a kind of data acquisition system (DAS) and collecting method.
Background technology
Grating is a kind of optoelectronic position scrambler, has to use flexible, the advantages such as measuring accuracy is high, long service life, has obtained extensive utilization in fields of measurement such as precision positioning, angle, speed, acceleration.Because there are various uncertain factors in industry spot, raster data output easily is interfered, wherein mechanical vibration in motion process and the electromagnetic interference (EMI) in site environment the most significantly, the two all can make the output pulse produce burr, cause the step-by-step counting mistake, thus the measuring accuracy of having a strong impact on.
Summary of the invention
The object of the present invention is to provide a kind of data acquisition system (DAS) and collecting method, by the impact of effective removal disturbing pulse on counting, guarantee the measuring accuracy of data acquisition system (DAS).
The embodiment of the present invention provides a kind of data acquisition system (DAS), and wherein, this data acquisition system (DAS) comprises:
Filtration module is used for obtaining first pulsed frequency of described grating under highest movement speed according to the incisure density of grating, will be considered as higher than the pulse of described the first pulsed frequency the disturbing pulse filtering, obtains filtered two-phase pulse signal;
Counting module is used for the direction of motion according to the described grating of described filtered two-phase pulse signal judgement, according to described direction of motion, described filtered two-phase pulse signal is counted, and obtains count results;
Data communication module is used for described count results being transferred to the data processing chip of described data acquisition system (DAS) outside under the triggering of clock signal.
The embodiment of the present invention also provides a kind of collecting method, and wherein, this collecting method comprises:
Obtain first pulsed frequency of described grating under highest movement speed according to the incisure density of grating, will be considered as higher than the pulse of described the first pulsed frequency the disturbing pulse filtering, obtain filtered two-phase pulse signal;
According to the direction of motion of the described grating of described filtered two-phase pulse signal judgement, according to described direction of motion, described filtered two-phase pulse signal is counted, obtain count results;
Under the triggering of clock signal, described count results is transferred to the data processing chip of described data acquisition system (DAS) outside.
Data acquisition system (DAS) provided by the invention and collecting method, filtration module obtains first pulsed frequency of grating under highest movement speed according to the incisure density of grating, the disturbing pulse filtering will be considered as higher than the pulse of the first pulsed frequency, thereby disturbing pulse can be effectively removed to the counting impact of the grating signal of grating output; Because grating direction of motion in rotation process can change, therefore count status also can freely switch in forward condition and reverse state at any time, counting module is according to the direction of motion of two-phase pulse judgement grating, according to direction of motion, filtered two-phase pulse signal is counted, effectively improved the counting precision of data acquisition system (DAS).
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of an embodiment of data acquisition system (DAS) of the present invention;
Fig. 2 is the structural representation of another embodiment of data acquisition system (DAS) of the present invention;
Fig. 3 is the schematic diagram of the two-phase pulse signal in embodiment illustrated in fig. 2;
Fig. 4 is the state conversion schematic diagram of middle counting module embodiment illustrated in fig. 2;
Fig. 5 is the schematic flow sheet of an embodiment of collecting method of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Fig. 1 is the structural representation of an embodiment of data acquisition system (DAS) of the present invention; As shown in Figure 1, the data acquisition system (DAS) in the embodiment of the present invention 100 specifically comprises: filtration module 11, counting module 12, data communication module 13; Wherein, filtration module 11 is connected with counting module 12, and counting module 12 is connected with data communication module 13.
The data acquisition system (DAS) that the embodiment of the present invention provides, filtration module 11 obtains first pulsed frequency of grating under highest movement speed according to the incisure density of grating, the disturbing pulse filtering will be considered as higher than the pulse of the first pulsed frequency, thereby disturbing pulse can be effectively removed to the counting impact of the grating signal of grating output; Because grating direction of motion in rotation process can change, therefore count status also can freely switch in forward condition and reverse state at any time, counting module 12 is according to the direction of motion of two-phase pulse judgement grating, according to described direction of motion, filtered two-phase pulse signal is counted, effectively improved the counting precision of data acquisition system (DAS).
Fig. 2 is the structural representation of another embodiment of data acquisition system (DAS) of the present invention; As shown in Figure 2, the data acquisition system (DAS) in the embodiment of the present invention 200 comprises: filtration module 21, counting module 22, data communication module 23, Clock management module 24, synchronous logic control module 25; Wherein, filtration module 11 is connected with counting module 12, and counting module 12 is connected with data communication module 13; Clock management module 24 all is connected with filtration module 21, counting module 22, data communication module 23, synchronous logic control module 25, thereby makes filtration module 21, counting module 22, data communication module 23, synchronous logic control module 25 work under same clock signal.
Filtration module 21 obtains first pulsed frequency of grating under highest movement speed according to the incisure density of grating, will be considered as higher than the pulse of this first pulsed frequency the disturbing pulse filtering; Counting module 22 is counted the two-phase pulse signal according to this direction of motion according to the direction of motion of filtered two-phase pulse signal judgement grating, obtains count results; Under the triggering of clock signal, data communication module 23 count results are transferred to the data processing chip of data acquisition system (DAS) outside; Clock management module 24 produces the clock signal of controlling filtration module 21, counting module 22, data communication module 23, synchronous logic control module 25; Synchronous logic control module 25 produces the clock signal with data processing chip 20 synchronised of data acquisition system (DAS) 200 outsides under the control of clock signal.
Further, filtration module 21 can also comprise: the first acquisition module 211, the second acquisition module 212, filter unit 213; Wherein, the first acquisition module 211 obtains the highest movement speed of grating; The second acquisition module 212 obtains the pulse number of the grating signal unit interval output of described grating output under highest movement speed, the pulse number of output is determined the first pulsed frequency that effective impulse is corresponding according to the unit interval; Filter unit 213 is determined high level or the low level duration of described effective impulse, if the described duration is lower than the pulse of the clock signal of setting number, the frequency of described effective impulse surpasses described the first pulsed frequency, described effective impulse is considered as disturbing pulse gives filtering.
Further, counting module 22 can also comprise: state recognition unit 221, Count of Status unit 222, count status switch unit 223; Wherein, state recognition unit 221 is determined the direction of motion of described grating according to the combinations of states of described two-phase pulse signal; Count of Status unit 222 carries out the quadruple step-by-step counting according to described direction of motion to described two-phase pulse signal; If the direction of motion of described grating changes, count status switch unit 223 notify status counting units 222 are switched count status in forward condition and reverse state.
Further, data communication module 23 can also comprise: the first communication unit 231 and second communication unit 232, the first communication units 231 are controlled the transmission of data with second communication unit 232 by same clock signal; Wherein, the first communication unit 231 is used for the data transmission of data acquisition system (DAS) 200 data processing chip 20 to data acquisition system (DAS) 200 outsides; Second communication unit 232 is used for will be from the data transmission of the data processing chip 20 of data acquisition system (DAS) 200 outsides to data acquisition system (DAS) 200.
In addition, under the triggering of the rising edge of described clock signal, the internal logic module (not showing in Fig. 2) of data acquisition system (DAS) 200 and data processing chip 20 be 232 data writings simultaneously to the first communication unit 231, second communication unit respectively; Under the triggering of the negative edge of described clock signal, the read-write logic module (not showing in Fig. 2) of data acquisition system (DAS) 200 inside and data processing chip 20 read respectively the data in the first communication unit 231, second communication unit 232.
The data acquisition system (DAS) that the embodiment of the present invention provides, filtration module 21 obtains first pulsed frequency of grating under highest movement speed according to the incisure density of grating, the disturbing pulse filtering will be considered as higher than the pulse of the first pulsed frequency, thereby disturbing pulse can be effectively removed to the counting impact of the grating signal of grating output; Because grating direction of motion in rotation process can change, therefore count status also can freely switch in forward condition and reverse state at any time, counting module 22 is according to the direction of motion of two-phase pulse judgement grating, according to described direction of motion, filtered two-phase pulse signal is counted, effectively improved the counting precision of data acquisition system (DAS) 200.
In order more clearly to understand the described technical scheme of the embodiment of the present invention, be described in detail embodiment illustrated in fig. 2 below by Fig. 3 and Fig. 4.Fig. 3 is the schematic diagram of the two-phase pulse signal in embodiment illustrated in fig. 2, and Fig. 4 is the state conversion schematic diagram of middle counting module embodiment illustrated in fig. 2.
As shown in Figure 3, according to the principle of work of incremental optical-electricity encoder, what grating was exported is that A and B two-way differ the pulse signal of 90 °.When grating is in forward condition, 90 ° of the leading B phase pulse signals of A phase pulse signal; When grating is in reverse state, 90 ° of the leading A phase of B phase pulse signal arteries and veins signals.
As shown in Figure 4, the two-phase pulse signal A of grating output, the positive and negative use 1,0 of B represent, total A1B1, A1B0, A0B1, the combination of A0B0 one of four states.When the exporting change of grating was A0B0 → A1B0 → A1B1 → A0B1 → A0B0, the expression grating was in forward condition, and counting module 22 adds 1; When the exporting change mode was A0B1 → A1B1 → A1B0 → A0B0 → A0B1, the expression grating was in reverse state, and counting module 22 subtracts 1.At any one constantly, the direction of motion of grating all can change, and count status also can switch in forward condition and reverse state at any time, thereby has completed the direction of motion of judgement grating.
Output A, the B of each grating change rear counting module 22 all can+1 or-1, for single pulse signal A or B, after it changed one-period, counting module 22 had been counted 4 times altogether, complete thus the quadruple operation, thereby effectively improved the counting precision of data acquisition system (DAS).
Fig. 5 is the schematic flow sheet of an embodiment of collecting method of the present invention, and the embodiment of the present invention can be carried out by the data acquisition system (DAS) in embodiment illustrated in figures 1 and 2; As shown in Figure 5, the embodiment of the present invention comprises the steps:
The collecting method that the embodiment of the present invention provides, obtain first pulsed frequency of grating under highest movement speed according to the incisure density of grating, the disturbing pulse filtering will be considered as higher than the pulse of the first pulsed frequency, thereby disturbing pulse can be effectively removed to the counting impact of the grating signal of grating output; Because grating direction of motion in rotation process can change, therefore count status also can freely switch in forward condition and reverse state at any time, and the embodiment of the present invention is according to the direction of motion of two-phase pulse judgement grating, according to direction of motion, filtered two-phase pulse signal is counted, thereby effectively improved the counting precision of data acquisition system (DAS).
Further, on above-mentioned basis embodiment illustrated in fig. 5, step 501 can also comprise:
Obtain the highest movement speed of described grating;
Obtain the pulse number of the grating signal unit interval output of described round light output under described highest movement speed, the pulse number of output is determined the first pulsed frequency that effective impulse is corresponding according to the unit interval;
Determine high level or the low level duration of described effective impulse, if the described duration is lower than the pulse of the clock signal of setting number, the frequency of described effective impulse surpasses described the first pulsed frequency, described effective impulse is considered as disturbing pulse gives filtering.
Further, on above-mentioned basis embodiment illustrated in fig. 5, step 502 can also comprise:
Determine the direction of motion of described grating according to the combinations of states of described two-phase pulse signal;
According to described direction of motion, described two-phase pulse signal is carried out the quadruple step-by-step counting.
Further, on above-mentioned basis embodiment illustrated in fig. 5, step 503 can also comprise:
The first communication unit by described data acquisition system (DAS) is with the data transmission of the described data acquisition system (DAS) data processing chip to described data acquisition system (DAS) outside;
Second communication unit by described data acquisition system (DAS) will be from the data transmission of the data processing chip of described data acquisition system (DAS) outside to described data acquisition system (DAS).
To sum up, the embodiment of the present invention provides a kind of data acquisition system (DAS) and collecting method, the data acquisition system (DAS) of the embodiment of the present invention and method have been completed filtering, counting and data transmission to the grating output signal, have effectively improved the counting precision of data acquisition system (DAS).
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-described embodiment can be completed by the hardware that programmed instruction is correlated with, aforesaid program can be stored in a computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a data acquisition system (DAS), is characterized in that, described data acquisition system (DAS) comprises:
Filtration module is used for obtaining first pulsed frequency of described grating under highest movement speed according to the incisure density of grating, will be considered as higher than the pulse of described the first pulsed frequency the disturbing pulse filtering, obtains filtered two-phase pulse signal;
Counting module is used for the direction of motion according to the described grating of described filtered two-phase pulse signal judgement, according to described direction of motion, described filtered two-phase pulse signal is counted, and obtains count results;
Data communication module is used for described count results being transferred to the data processing chip of described data acquisition system (DAS) outside under the triggering of clock signal.
2. data acquisition system (DAS) according to claim 1, is characterized in that, described filtration module comprises:
The first acquisition module is for the highest movement speed of obtaining described grating;
The second acquisition module, for the pulse number of the grating signal unit interval output of obtaining described grating output under described highest movement speed, the pulse number of output is determined the first pulsed frequency that effective impulse is corresponding according to the unit interval;
Filter unit, be used for determining high level or the low level duration of described effective impulse, if the described duration, the frequency of described effective impulse surpassed described the first pulsed frequency, described effective impulse is considered as disturbing pulse gives filtering lower than the pulse of the clock signal of setting number.
3. data acquisition system (DAS) according to claim 1, is characterized in that, described counting module comprises:
State recognition unit is for determine the direction of motion of described grating according to the combinations of states of described two-phase pulse signal;
The Count of Status unit is used for according to described direction of motion, described two-phase pulse signal being carried out the quadruple step-by-step counting.
4. data acquisition system (DAS) according to claim 3, is characterized in that, described counting module also comprises:
The count status switch unit changes if be used for the direction of motion of described grating, notifies described Count of Status unit that count status is switched in forward condition and reverse state.
5. according to claim 1～4 arbitrary described data acquisition system (DAS)s, it is characterized in that, described data communication module comprises: the first communication unit and second communication unit, and the transmission of data is controlled in described the first communication unit and described second communication unit by same clock signal; Wherein, described the first communication unit is used for the data transmission of the described data acquisition system (DAS) data processing chip to described data acquisition system (DAS) outside; Described second communication unit is used for will be from the data transmission of the data processing chip of described data acquisition system (DAS) outside to described data acquisition system (DAS);
Wherein, under the triggering of the rising edge of described clock signal, the internal logic module of described data acquisition system (DAS) and described data processing chip be the data writing simultaneously to described the first communication unit, described second communication unit respectively; Under the triggering of the negative edge of described clock signal, the read-write logic module of described data acquisition system (DAS) inside and described data processing chip read respectively the data in described the first communication unit, described second communication unit.
6. data acquisition system (DAS) according to claim 5, is characterized in that, described data acquisition system (DAS) also comprises: Clock management module and synchronous logic control module;
Described Clock management module makes described filtration module, described counting module, described data communication module, described synchronous logic control module work under same clock signal for generation of the described clock signal of controlling described filtration module, described counting module, described data communication module, described synchronous logic control module;
Described synchronous logic control module is used for producing the clock signal with the data processing chip synchronised of described data acquisition system (DAS) outside under the control of described clock signal.
7. a collecting method, is characterized in that, described collecting method comprises:
Obtain first pulsed frequency of described grating under highest movement speed according to the incisure density of grating, will be considered as higher than the pulse of described the first pulsed frequency the disturbing pulse filtering, obtain filtered two-phase pulse signal;
According to the direction of motion of the described grating of described filtered two-phase pulse signal judgement, according to described direction of motion, described filtered two-phase pulse signal is counted, obtain count results;
Under the triggering of clock signal, described count results is transferred to the data processing chip of described data acquisition system (DAS) outside.
8. collecting method according to claim 7, it is characterized in that, described incisure density according to grating obtains first pulsed frequency of described grating under highest movement speed, and the step that will be considered as higher than the pulse of described the first pulsed frequency the disturbing pulse filtering comprises:
Obtain the highest movement speed of described grating;
Obtain the grating signal of described grating output at the pulse number of unit interval output under described highest movement speed, the pulse number of output is determined the first pulsed frequency that effective impulse is corresponding according to the unit interval;
Determine high level or the low level duration of described effective impulse, if the described duration is lower than the pulse of the clock signal of setting number, the frequency of described effective impulse surpasses described the first pulsed frequency, described effective impulse is considered as disturbing pulse gives filtering.
9. according to claim 7 or 8 described collecting methods, it is characterized in that, described direction of motion according to the described grating of described filtered two-phase pulse signal judgement, the step of described filtered two-phase pulse signal being counted according to described direction of motion comprises:
Determine the direction of motion of described grating according to the combinations of states of described two-phase pulse signal;
According to described direction of motion, described two-phase pulse signal is carried out the quadruple step-by-step counting.
10. according to claim 7～9 arbitrary described collecting methods, is characterized in that, the described step that described count results is transferred to the data processing chip of described data acquisition system (DAS) outside comprises:
The first communication unit by described data acquisition system (DAS) is with the data transmission of the described data acquisition system (DAS) data processing chip to described data acquisition system (DAS) outside;
Second communication unit by described data acquisition system (DAS) will be from the data transmission of the data processing chip of described data acquisition system (DAS) outside to described data acquisition system (DAS).
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Cited By (2)
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| CN107753013A (en) * | 2017-11-09 | 2018-03-06 | 广州众健医疗科技有限公司 | A kind of cardiac electric data sampler data processing method |
| CN107928661A (en) * | 2017-11-09 | 2018-04-20 | 广州众健医疗科技有限公司 | A kind of cardiac electric data sampler data collecting system and method |
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Application publication date: 20130515 |