CN104376128A - Data collecting method for front end data collecting and control terminal of Internet of Things - Google Patents
Data collecting method for front end data collecting and control terminal of Internet of Things Download PDFInfo
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- CN104376128A CN104376128A CN201410543555.0A CN201410543555A CN104376128A CN 104376128 A CN104376128 A CN 104376128A CN 201410543555 A CN201410543555 A CN 201410543555A CN 104376128 A CN104376128 A CN 104376128A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention discloses a data collecting method for a front end data collecting and control terminal of the Internet of Things. The input end of the data collecting and control terminal is connected into an isolation circuit to achieve channel isolation, wherein according to the channel isolation, an analog signal isolation amplifier is used for amplifying input weak signals, then a linear coupler is adopted for conducting electrical isolation linear coupling on the amplified signals, and then the signals are transmitted to an AD conversion transmitting end; after nonlinear conversion is conducted, a nonlinear compensation procedure is adopted for conducting linear interpolation processing on the signals obtained after analog-digital conversion, wherein according to the linear interpolation processing, when a product is calibrated, linear processing is conducted on the relations of multiple input and output points, and results are recorded in a table which serves as a reference calibration table; input values obtained in real time are then calibrated; for the input value which does not conform to the reference calibration table, the input value is compared with the two adjacent data, a linear scale is obtained, and input data obtained after linear calibration are worked out.
Description
Technical field
The present invention relates to data acquisition and the control technology of Internet of Things, particularly relate to multichannel data acquisition and isolation control terminal data are gathered and the method processed.
Background technology
The simulating signal that Internet of Things front end is exported by pick-up transducers also converts digital signal to, and carries out analyzing, process, transmit, store and controlling.Internet of Things Front Side Bus formula multi-channel data acquisition terminal common is at present all adopt mode data acquisition and the transmission of directly input quantity being carried out AD conversion.Its advantage is simply, in ecotopia precision and the linearity high, expand passage convenient, but once depart from glitch-free ecotopia, but time under the industrial environment of complexity, will occur, owing to there is various industrial electric signal, noise, to affect the situation of the collection of data.When the feeble signal exported by signal source or sensor is sent to data collection station, what receive has superposed the result of various undesired signal often.Directly being sent into data collection station carries out analog to digital conversion, and realistic accuracy and the linearity are greatly affected.
Secondly, if multiple sensor feeble signal is without the isolation of channel, the mutual disturbing effect of the signal of different channels may be had.Its phenomenon be when a passage input comparatively large-signal time, adjacent passage also has faint induction signal imitation, and channel isolation is greatly affected.In addition, when industrial sensor is powered by different electric power systems, very large datum difference may be had, directly the ground wire of different electric power system is connected by data collection station, very large potential safety hazard will be had, light then bring strong jamming, serious even corrupt data acquisition terminal or other system equipment.
Summary of the invention
The present invention is directed to and above present the method that a kind of environment resistant interference performance is strong, precision is high, the linearity is high internet of things data acquisition and control terminal carry out data acquisition, its data linearity is high and can reduce and interfere with each other situation between hyperchannel.
Internet of things data acquisition involved in the present invention and the collecting method of control terminal, access in buffer circuit at the input end of data acquisition and control terminal and carry out channel isolation, this channel isolation adopts analog signal isolating amplifier, amplification process is carried out to the feeble signal of input, then adopt linear coupler to carry out electrical isolation linear coupling to the signal after amplification, then this signal is transported to AD conversion delivery end; After non-linear conversion, adopt nonlinear compensation program to carry out linear interpolation processing to have passed through analog-to-digital signal, multiple input and output point relation, when product is calibrated, is first carried out linearization process by this linear interpolation processing, be recorded as form, as reference correction card; Then the input value obtained in real time is calibrated; To the input value not meeting this reference correction card, by comparing with adjacent two data, obtaining linear scaling, calculating the input data after linear gauging.
[accompanying drawing explanation]
Fig. 1 is the structural representation of Internet of Things front end data acquisition of the present invention and control terminal;
[embodiment]
Below in conjunction with the drawings and specific embodiments of the present invention to the present invention is based on the parking lot management control system of license plate number identification and seeking car method and be described in further detail.
The collecting method of internet of things data acquisition and control terminal, access in buffer circuit at the input end of data acquisition and control terminal and carry out channel isolation, this channel isolation adopts analog signal isolating amplifier, amplification process is carried out to the feeble signal of input, then adopt linear coupler to carry out electrical isolation linear coupling to the signal after amplification, then this signal is transported to AD conversion delivery end; After non-linear conversion, adopt nonlinear compensation program to carry out linear interpolation processing to have passed through analog-to-digital signal, multiple input and output point relation, when product is calibrated, is first carried out linearization process by this linear interpolation processing, be recorded as form, as reference correction card; Then the input value obtained in real time is calibrated; To the input value not meeting this reference correction card, by comparing with adjacent two data, obtaining linear scaling, calculating the input data after linear gauging.
If system only introduces merely interchannel signal isolation amplifying technique, new problem will be brought, in original non-isolated multi channel signals data collection station, because signal directly sends into analog to digital conversion, without conversion process, well save the original linearity of signal, general mission nonlinear degree can control 0.05%.And after system introduces interchannel signal isolation amplifying technique, because isolation technology brings linear deterioration.The linearity of whole system just starts to depend on isolated amplifier, although the isolated amplifier adopted has done the rank that comprehensive optimization nonlinearity still can only control 0.2%, and higher than a non-isolated multi channel signals data collection station order of magnitude.Its linearity order of magnitude lower than non-isolated multi channel signals data collection station is then described.
In order to meet the applied environment requirement of increasingly stringent, new technology must be taked to improve the nonlinearity of whole system.Traditional nonlinear compensation technology normally introduces certain feedback in the operational amplifier that signal transacting is used, improves whole system nonlinearity.And our input signal form may be curtage at present, full scale value alters a great deal with different product, directly implement nonlinear compensation difficulty greatly at hardware-level, so adopt linear interpolation processing mode, on original middle-end equipment, there is no display window, during use, often feel inconvenient, cannot on-the-spot spot check and inquiry.For convenience of on-the-spot spot check and inquiry, add LCD display device in systems in which, namely a signal output interface is set on untreated device, at the external LCD display device of this signal output interface, carry out data display.This design greatly facilitates user, realizes the online direct-reading of field data, facilitates fault diagnosis and plant maintenance, greatly facilitate the raising of patrolling and examining with plant maintenance efficiency.
The above, it is only present pre-ferred embodiments, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, any simple modification that above embodiment is done is referred to according to the technology of the present invention, equivalent variations and modification, all belong in the scope of technical solution of the present invention.
Claims (1)
1. the collecting method of an internet of things data acquisition and control terminal, it is characterized in that, access in buffer circuit at the input end of data acquisition and control terminal and carry out channel isolation, this channel isolation adopts analog signal isolating amplifier, amplification process is carried out to the feeble signal of input, then adopt linear coupler to carry out electrical isolation linear coupling to the signal after amplification, then this signal is transported to AD conversion delivery end; After non-linear conversion, adopt nonlinear compensation program to carry out linear interpolation processing to have passed through analog-to-digital signal, multiple input and output point relation, when product is calibrated, is first carried out linearization process by this linear interpolation processing, be recorded as form, as reference correction card; Then the input value obtained in real time is calibrated; To the input value not meeting this reference correction card, by comparing with adjacent two data, obtaining linear scaling, calculating the input data after linear gauging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410543555.0A CN104376128A (en) | 2014-10-15 | 2014-10-15 | Data collecting method for front end data collecting and control terminal of Internet of Things |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410543555.0A CN104376128A (en) | 2014-10-15 | 2014-10-15 | Data collecting method for front end data collecting and control terminal of Internet of Things |
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| CN104376128A true CN104376128A (en) | 2015-02-25 |
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| CN201410543555.0A Pending CN104376128A (en) | 2014-10-15 | 2014-10-15 | Data collecting method for front end data collecting and control terminal of Internet of Things |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202257920U (en) * | 2011-10-21 | 2012-05-30 | 青岛理工大学 | Remote multipath data acquisition device based on GPRS |
| CN103954312A (en) * | 2014-04-24 | 2014-07-30 | 福建顺昌虹润精密仪器有限公司 | Data acquisition paperless recorder |
| US8818292B1 (en) * | 2013-03-15 | 2014-08-26 | Wilson Electronics, Llc | Bi-directional amplifier with a common signal detector |
| CN203849398U (en) * | 2014-03-24 | 2014-09-24 | 国家电网公司 | An electric energy meter on-site value transmission apparatus |
-
2014
- 2014-10-15 CN CN201410543555.0A patent/CN104376128A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202257920U (en) * | 2011-10-21 | 2012-05-30 | 青岛理工大学 | Remote multipath data acquisition device based on GPRS |
| US8818292B1 (en) * | 2013-03-15 | 2014-08-26 | Wilson Electronics, Llc | Bi-directional amplifier with a common signal detector |
| CN203849398U (en) * | 2014-03-24 | 2014-09-24 | 国家电网公司 | An electric energy meter on-site value transmission apparatus |
| CN103954312A (en) * | 2014-04-24 | 2014-07-30 | 福建顺昌虹润精密仪器有限公司 | Data acquisition paperless recorder |
Non-Patent Citations (1)
| Title |
|---|
| 蔡兵: "几种简单的传感器非线性校正技术", 《长江大学学报（自然科学版）》 * |
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Application publication date: 20150225 |