CN105353695A - Feedback event driven type analog signal frequency conversion acquisition circuit and acquisition method - Google Patents
Feedback event driven type analog signal frequency conversion acquisition circuit and acquisition method Download PDFInfo
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- CN105353695A CN105353695A CN201510918795.9A CN201510918795A CN105353695A CN 105353695 A CN105353695 A CN 105353695A CN 201510918795 A CN201510918795 A CN 201510918795A CN 105353695 A CN105353695 A CN 105353695A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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Abstract
The invention discloses a feedback event driven type analog signal frequency conversion acquisition circuit. The circuit comprises a sensor, a low-pass filter, a voltage follower, an analog-to-digital converter, a first comparator, a second comparator, a first digital-to-analog converter, a second digital-to-analog converter and a core controller. A sampling frequency can be automatically adjusted according to a disaster change condition, an early-stage slow change and an inducting factor condition of a geological body disaster change process are monitored, and a long-term disaster change response of a geological disaster is convenient to research; and a dynamic condition at a disaster change moment can be timely and effectively monitored, research of a disaster change transient dynamic characteristic is facilitated, and disaster monitoring early warning is convenient. Through adaptive sampling frequency adjustments, system power consumption can be reduced, the system endurance ability is maximized, and the circuit is relatively suitable for an actual application in field on-site complex environment.
Description
Technical field
The present invention relates to a kind of geology Acquisition Circuit, particularly relate to a kind of feedback-type event-driven simulating signal frequency conversion Acquisition Circuit and acquisition method.
Background technology
Intelligent monitoring instrument is ubiquitous following problem in Geological Hazards Monitoring process in the wild: (1) is at adverse weather condition, as in the situations such as long-term rainfall, haze sky, monitoring instrument can occur out of service along with sun power and powered battery deficiency; (2) in the automatic observation process of a lot of information on geological disasters, sampling rate because of Acquisition Circuit arranges too low, cause as landslide add ski-running become stage this kind of emergency go out now can not instant complete crawl geologic hazard sharply change procedure, the monitoring and warning of disaster and scientific research are all caused to the loss of a large amount of useful information; Or arrange too high because of sampling rate, cause data volume huge, under normal circumstances geologic body do not have catastrophe or catastrophe minimum time valueless data omission, unnecessary trouble is caused to data analysis and extraction, simultaneously can the more resource of consumption systems, increase system cost and power consumption, the flying power of instrument sharply declines.To geologic body Catastrophe Process, we need to pay close attention to slowly change and risk factor situation in early stage on the one hand, are convenient to the long-term catastrophe response of geologize disaster; More pay close attention to the current intelligence in catastrophe moment on the other hand, be conducive to research catastrophe Dynamic Test Transient step response, be convenient to the monitoring and warning of disaster.
Summary of the invention
Object of the present invention is just to provide one to solve the problem, can by foundation catastrophe situation to the automatic adjustment of sample frequency, reduce and repeat tediously long data and the encryption sampled data of not losing the Rapid Variable Design stage, be convenient to analyze and real-time early warning, maximized by adaptive sampling rate adjustment and reduce system power dissipation, the flying power of maximization system, more adapts to a kind of feedback-type event-driven simulating signal frequency conversion Acquisition Circuit of the practical application of field condition complex environment.
To achieve these goals, the technical solution used in the present invention is such: a kind of feedback-type event-driven simulating signal frequency conversion Acquisition Circuit, comprises low-pass filter, voltage follower, analog to digital converter, the first comparer, the second comparer, the first digital to analog converter, the second digital to analog converter and core controller;
Described low-pass filter input end connects a sensor, and output terminal is divided into three tunnels, and be connected with voltage follower anode, the first comparer anode, the second comparer negative terminal respectively, described sensor is displacement transducer or pressure transducer;
Two output terminals of described core controller connect the negative terminal of the first comparer and the anode of the second comparer respectively by the first digital to analog converter, the second digital to analog converter,
The output terminal of the first comparer, the second comparer connects one or logical-arithmetic unit, or the output terminal of the output terminal of logical-arithmetic unit and voltage follower is connected with the trigger input of analog to digital converter and signal input part respectively;
The output terminal of described analog to digital converter is divided into two-way, is connected with data line respectively by interrupt line with core controller, and described core controller is also provided with a state control output end, is connected with the input end of analog to digital converter by state controller;
Described core controller is also connected with clock circuit, RS232 communication interface circuit and data storage cell.
As preferably: described core controller is microcontroller, arm processor or FPGA.
A kind of feedback-type event-driven simulating signal frequency-conversion collection method, comprises the following steps:
(1) a kind of feedback-type event-driven simulating signal frequency conversion Acquisition Circuit is built;
(2) sensor sample is once, sends in core controller, is preset the threshold value of the first comparer, the second comparer by core controller according to this sampled value, and in feed-in first comparer, the second comparer;
(3) sensor sample, is divided into three tunnels after low-pass filter filtering, and wherein a road is sent in analog to digital converter through voltage follower, and two-way is sent in the first comparer, the second comparer and compared with predetermined threshold value in addition,
If do not exceed threshold value, then according to default sampling interval, timing sampling also records storage;
If the sampled value monitored in any one comparer exceedes predetermined threshold value, then proceed as follows:
A () triggers or logical-arithmetic unit exports high level;
B () described high level controls analog to digital converter and starts translation function, the sampled value sent into through voltage follower in analog to digital converter is carried out analog to digital conversion, export interruption after EOC and wake core controller up, read the sampled value after the conversion of analog to digital converter, and record stores;
C () core controller is according to formula
calculate correction threshold, wherein, Δ V
ifor correction threshold, V
iand V
i-1be respectively current sample values and last time sampled value, k is the control coefrficient according to test adjustment data acquisition, Δ t
iit is the difference of current sample time and last sampling instant;
(4) by correction threshold feed-in first comparer, the second comparer, and above-mentioned steps (3) is repeated.
As preferably: in step (2), sensor sample value is once V
i, then the threshold value preset in the first comparer, the second comparer is respectively V
i+ Δ V, V
i-Δ V
i.
Compared with prior art, the invention has the advantages that: a kind of feedback-type event-driven simulating signal frequency conversion Acquisition Circuit and the acquisition method that the present invention be directed to field geology disaster monitoring instrument work characteristics and Problems existing proposition, automatically can adjust sample frequency according to catastrophe situation, to geologic body Catastrophe Process, can monitor slow change in its early stage and risk factor situation, be convenient to the long-term catastrophe response of geologize disaster; Also effectively can monitor the current intelligence in catastrophe moment in time, be conducive to research catastrophe Dynamic Test Transient step response, be convenient to the monitoring and warning of disaster.
The present invention is according to formula
calculate correction threshold, as can be seen from formula, the embedded Control program of core controller need according to sampled value each time and last time sampled value rate of change ratio correction Δ V
ivalue, speedup is faster, Δ V
iless, sampling density is larger, more can catch the complete procedure changed rapidly.And owing to have employed adaptive sampling rate method of adjustment, maximize and reduce system power dissipation, maximize the flying power of system, more adapt to the practical application of field condition complex environment.
Accompanying drawing explanation
Fig. 1 is functional block diagram of the present invention;
Fig. 2 is that the present invention triggers sampling schematic diagram;
Fig. 3 is prior art sample graph;
Fig. 4 is sample graph of the present invention.
In figure: 1, voltage follower; 2, the first comparer; 3, the second comparer; 4, analog to digital converter; 5, the first digital to analog converter; 6, the second digital to analog converter; 7 or logical-arithmetic unit; 8, clock circuit; 9, RS232 communication interface circuit; 10, data storage cell; 11, low-pass filter.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Embodiment 1: see Fig. 1 and Fig. 2, a kind of feedback-type event-driven simulating signal frequency conversion Acquisition Circuit, comprises low-pass filter 11, voltage follower 1, analog to digital converter 4, first comparer 2, second comparer 3, first digital to analog converter 5, second digital to analog converter 6 and core controller; Described low-pass filter 11 input end connects a sensor, and output terminal is divided into three tunnels, and be connected with voltage follower 1 anode, the first comparer 2 anode, the second comparer 3 negative terminal respectively, described sensor is displacement transducer or pressure transducer; Two output terminals of described core controller connect the negative terminal of the first comparer 2 and the anode of the second comparer 3 respectively by the first digital to analog converter 5, second digital to analog converter 6, the output terminal of the first comparer 2, second comparer 3 connects one or logical-arithmetic unit 7, or the output terminal of the output terminal of logical-arithmetic unit 7 and voltage follower 1 is connected with the trigger input of analog to digital converter 4 and signal input part respectively; The output terminal of described analog to digital converter 4 is divided into two-way, is connected with data line respectively by interrupt line with core controller, and described core controller is also provided with a state control output end, is connected by the input end of state controller with analog to digital converter 4; Described core controller is also connected with clock circuit 8, RS232 communication interface circuit 9 and data storage cell 10, and in the present invention, described core controller is microcontroller, arm processor or FPGA.
A kind of acquisition method of feedback-type event-driven simulating signal frequency conversion Acquisition Circuit is:
(1) a kind of feedback-type event-driven simulating signal frequency conversion Acquisition Circuit is built;
(2) sensor sample once, and after high frequency noise removed by low-pass filter 11, after voltage follower 1, analog to digital converter 4 convert digital signal to, send in core controller, the sampled value that current core controller obtains is V
i, meanwhile, core controller arranges two threshold value V
i+ Δ V, V
i-Δ V
i, respectively after the first digital to analog converter 5, second digital to analog converter 6 converts simulating signal to, in feed-in first comparer 2, second comparer 3;
(3) sensor is sampled again, three tunnels are divided into after low-pass filter 11 filtering, wherein a road is sent in analog to digital converter 4 through voltage follower 1, and two-way is sent in the first comparer 2, second comparer 3 and compared with predetermined threshold value, because two threshold values are V in addition
i+ Δ V, V
i-Δ V, that is, V
ichange when reaching Δ V, no matter be reduce Δ V or increase Δ V, all can be monitored out by the comparer of correspondence, now change be divided into two kinds of situations:
If do not exceed threshold value, then according to default sampling interval, timing sampling also records storage; Such as, every day timing sampling once or sampling should be carried out each hour, determine as the case may be, the object done like this reduce that data volume is convenient to store on the one hand, transmission and analyzing, be convenient to healthy running status of the present invention on the other hand;
If the sampled value monitored in any one comparer exceedes predetermined threshold value, then proceed as follows:
A () triggers or logical-arithmetic unit 7 exports high level;
B () described high level controls analog to digital converter 4 and starts translation function, by through voltage follower 1 sampled value sent in analog to digital converter 4 carry out analog to digital conversion, export interruption after EOC and wake core controller up, read the sampled value after the conversion of analog to digital converter 4, and record stores;
C () core controller is according to formula
calculate correction threshold, wherein, Δ V
ifor correction threshold, V
iand V
i-1be respectively current sample values and last time sampled value, k is the control coefrficient according to test adjustment data acquisition, Δ t
iit is the difference of current sample time and last sampling instant;
(4) by correction threshold feed-in first comparer 2, second comparer 3, and above-mentioned steps (3) is repeated.
As can be seen from such scheme we:
Change to economize on resources and reducing the continuous sampling of analog to digital converter 4 clock the system power dissipation produced in the present invention, do not start the clock of analog to digital converter 4, adopt external trigger mode to start the single conversion of analog to digital converter 4.In fig. 2, suppose that certain sampled value is once V
i, this sampled value V may be greater than or less than at the analog voltage in next moment
i, we are greater than V at hypothesis
inext sampled value be V
i+1, be less than V
inext sampled value be V
i+1', so core controller feeds back respectively respectively by first, second digital to analog converter 6 and exports V
i+ Δ V, V
ithe value of-Δ V compares for first, second comparer 3, exceeds V as long as no matter increase or reduce
ithe scope of ± Δ V, will make or logical-arithmetic unit 7 output logic high level, and trigger mode number converter 4 starts conversion.The embedded Control program of core controller need according to sampled value each time and last time sampled value rate of change ratio correction Δ V
ivalue, speedup is faster, Δ V
iless, sampling density is larger, more can catch the complete procedure changed rapidly.And at not large change at ordinary times or atomic little changing period, microcontroller can according to the sampling of the output start by set date analog to digital converter 4 of clock circuit 8, such as every day timing sampling once or sampling should be carried out each hour, determine as the case may be, reduce data volume to be on the one hand convenient to store, transmit and analyze, be convenient to the healthy running status of detecting system on the other hand.
See Fig. 3, Fig. 4, Fig. 3 is the comparison diagram of normal acquisition circuit data result and this patent sampled result.Under conventional clock driving sampling 100Hz sample frequency, data are 533380 sampled points, and event triggering method of the present invention is only 296 points, and can grab all processes of Displacement Saltation.Visible, the present invention can obtain applications well in Loess Landslide deformation parameter monitoring in the wild.
Claims (4)
1. a feedback-type event-driven simulating signal frequency conversion Acquisition Circuit, is characterized in that:
Comprise low-pass filter, voltage follower, analog to digital converter, the first comparer, the second comparer, the first digital to analog converter, the second digital to analog converter and core controller;
Described low-pass filter input end connects a sensor, and output terminal is divided into three tunnels, and be connected with voltage follower anode, the first comparer anode, the second comparer negative terminal respectively, described sensor is displacement transducer or pressure transducer;
Two output terminals of described core controller connect the negative terminal of the first comparer and the anode of the second comparer respectively by the first digital to analog converter, the second digital to analog converter,
The output terminal of the first comparer, the second comparer connects one or logical-arithmetic unit, or the output terminal of the output terminal of logical-arithmetic unit and voltage follower is connected with the trigger input of analog to digital converter and signal input part respectively;
The output terminal of described analog to digital converter is divided into two-way, is connected with data line respectively by interrupt line with core controller, and described core controller is also provided with a state control output end, is connected with the input end of analog to digital converter by state controller;
Described core controller is also connected with clock circuit, RS232 communication interface circuit and data storage cell.
2. a kind of feedback-type event-driven simulating signal frequency conversion Acquisition Circuit according to claim 1, is characterized in that: described core controller is microcontroller, arm processor or FPGA.
3. a feedback-type event-driven simulating signal frequency-conversion collection method, is characterized in that: comprise the following steps:
(1) a kind of feedback-type event-driven simulating signal frequency conversion Acquisition Circuit is built;
(2) sensor sample is once, sends in core controller, is preset the threshold value of the first comparer, the second comparer by core controller according to this sampled value, and in feed-in first comparer, the second comparer;
(3) sensor sample, is divided into three tunnels after low-pass filter filtering, and wherein a road is sent in analog to digital converter through voltage follower, and two-way is sent in the first comparer, the second comparer and compared with predetermined threshold value in addition,
If do not exceed threshold value, then according to default sampling interval, timing sampling also records storage;
If the sampled value monitored in any one comparer exceedes predetermined threshold value, then proceed as follows:
A () triggers or logical-arithmetic unit exports high level;
B () described high level controls analog to digital converter and starts translation function, the sampled value sent into through voltage follower in analog to digital converter is carried out analog to digital conversion, export interruption after EOC and wake core controller up, read the sampled value after the conversion of analog to digital converter, and record stores;
C () core controller is according to formula
calculate correction threshold, wherein, Δ V
ifor correction threshold, V
iand V
i-1be respectively current sample values and last time sampled value, k is the control coefrficient according to test adjustment data acquisition, Δ t
iit is the difference of current sample time and last sampling instant;
(4) by correction threshold feed-in first comparer, the second comparer, and above-mentioned steps (3) is repeated.
4. a kind of feedback-type event-driven simulating signal frequency-conversion collection method according to claim 1, it is characterized in that: in step (2), sensor sample value is once V
i, then the threshold value preset in the first comparer, the second comparer is respectively V
i+ Δ V, V
i-Δ V
i.
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Cited By (9)
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| CN108089575A (en) * | 2016-11-23 | 2018-05-29 | 苏州宝时得电动工具有限公司 | From positioning device for mobile equipment and method |
| CN109540065A (en) * | 2018-12-18 | 2019-03-29 | 国网西藏电力有限公司 | A kind of number mining method of the area Ji Han landslide fissure automatic monitoring device |
| CN110941205A (en) * | 2018-09-21 | 2020-03-31 | 欧姆龙(上海)有限公司 | Sampling control device, sampling control method and electronic equipment |
| CN111169184A (en) * | 2020-02-19 | 2020-05-19 | 上海商米科技集团股份有限公司 | Sampling method and sampling device |
| CN111258264A (en) * | 2020-02-24 | 2020-06-09 | 北京龙鼎源科技股份有限公司 | Filtering method and device for field noise, storage medium and processor |
| CN113137911A (en) * | 2021-04-25 | 2021-07-20 | 成都理工大学 | Real-time frequency conversion landslide monitoring devices based on RTK |
| CN113445168A (en) * | 2021-06-28 | 2021-09-28 | 苏州墨空视觉技术有限公司 | Self-adaptive single-ingot detection system and method for improving distance measurement accuracy |
| CN113484905A (en) * | 2021-06-02 | 2021-10-08 | 成都理工大学 | Embedded acquisition circuit and acquisition method for adaptively discriminating microseismic signals |
| CN115447732A (en) * | 2022-11-11 | 2022-12-09 | 青州鑫聚隆装备制造有限公司 | Fault prediction system based on ship equipment operation parameters |
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| CN110941205A (en) * | 2018-09-21 | 2020-03-31 | 欧姆龙(上海)有限公司 | Sampling control device, sampling control method and electronic equipment |
| CN109540065A (en) * | 2018-12-18 | 2019-03-29 | 国网西藏电力有限公司 | A kind of number mining method of the area Ji Han landslide fissure automatic monitoring device |
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| CN111258264A (en) * | 2020-02-24 | 2020-06-09 | 北京龙鼎源科技股份有限公司 | Filtering method and device for field noise, storage medium and processor |
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| CN113137911A (en) * | 2021-04-25 | 2021-07-20 | 成都理工大学 | Real-time frequency conversion landslide monitoring devices based on RTK |
| CN113484905A (en) * | 2021-06-02 | 2021-10-08 | 成都理工大学 | Embedded acquisition circuit and acquisition method for adaptively discriminating microseismic signals |
| CN113445168A (en) * | 2021-06-28 | 2021-09-28 | 苏州墨空视觉技术有限公司 | Self-adaptive single-ingot detection system and method for improving distance measurement accuracy |
| CN113445168B (en) * | 2021-06-28 | 2022-08-23 | 苏州墨空视觉技术有限公司 | Method of self-adaptive single-spindle detection system for improving distance measurement accuracy |
| CN115447732A (en) * | 2022-11-11 | 2022-12-09 | 青州鑫聚隆装备制造有限公司 | Fault prediction system based on ship equipment operation parameters |
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