CN205333671U - Wind speed collector based on dual -frenquency meter - Google Patents
Wind speed collector based on dual -frenquency meter Download PDFInfo
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- CN205333671U CN205333671U CN201620079561.XU CN201620079561U CN205333671U CN 205333671 U CN205333671 U CN 205333671U CN 201620079561 U CN201620079561 U CN 201620079561U CN 205333671 U CN205333671 U CN 205333671U
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Abstract
The utility model discloses a wind speed collector based on dual -frenquency meter, air velocity transducer, signal converting unit, frequency division processing unit, data selection unit, centralized control processing unit connect gradually, still are connected with the power that provides the electric power support for this collector, it is the signal of telecommunication that the wind speed collector is used for the wind speed signal conversion with acquireing, signal converting unit, frequency division processing unit and data selection unit are used for handling and inputing to centralized control processing unit the signal of telecommunication, centralized control processing unit controls count, decoding, the frequency dividing ratio of the signal of telecommunication that awaits measuring, and cycle / frequency of being surveyed the signal of telecommunication is measured to its internal timing ware / counter, calculates and obtains the wind speed data. The utility model discloses in applying to elegant demeanor collection measurement system with dual -frenquency instrumentation volume, realized having improved wind speed measuring precision with equal precision measurement in the frequency channel.
Description
Technical field
This utility model relates to the measuring wind speed technical field in meteorological cause, particularly to a kind of wind speed harvester based on double frequency meter。
Background technology
Wind has important effect in weather forecast, is widely used frequently as good forecasting index。At present, being widely used in the wind speed harvester in meteorological sensor digital network system, precision and resolution to the air speed data measured have higher requirements, and owing to being applied to Meteorological Services, wind speed harvester is typically mounted at open air, it is desirable to long transmission distance, and transmission distortion degree is little。
Generally, the air velocity transducer that wind field uses is three cup type photoelectric type air velocity transducers, its operation principle is: when vane rotates, the multiple tooth episcotister being placed between the light emitting diode of photoelectrical coupler and phototriode can be driven to rotate, the light beam that light emitting diode is launched is cut by the tooth degree on fluted disc, following phototriode will be made sometimes to receive the light of light emitting diode transmitting above and turn on, sometimes do not receive light emitting diode above to irradiate the light come and end, so, phototriode produces pulse output, each tooth covers the time of light beam and shows as low level, light beam shows as high level by the time between two gear gap。Rotate axle and rotate a circle, repeatedly cutting light beam and export one high and one low pulse signal, air velocity transducer output is all the pulse signal (signal frequency is less than 1kHz) that is directly proportional to wind speed of frequency, measures signal frequency and just can obtain wind speed。The precision of frequency measurement directly affects the precision of measuring wind speed。
In tradition measuring wind speed scheme (including measuring period method and Measuring Frequency Method), cycle test method is usually taken when measuring lower frequency, Measuring Frequency Method is adopted when measuring upper frequency, Measuring Frequency Method or measuring period method have higher precision in the measurement frequency range of its correspondence, but they all without eliminate well reference signal ± 1 digital error, and two kinds of frequency measuring methods are all difficult to take into account whole frequency range, it is impossible to realize the equally accurate of whole frequency range, high-acruracy survey。If the dynamic range of frequency input signal is relatively big, in order to ensure its certainty of measurement, it is necessary to manual switching frequency measurement and all modes of survey continually。The unit of display of both modes is different again, brings great inconvenience to the consecutive variations of observed frequency。In a word, traditional measurement has significant limitation, and certainty of measurement is not high yet。
Utility model content
Technical problem to be solved in the utility model there is provided a kind of wind speed harvester based on double frequency meter, applies in wind collecting and measuring system by double frequency measurement amount, it is achieved with equal precision measurement in frequency range, improves the precision of measuring wind speed。
For solving above-mentioned technical problem, the technical solution adopted in the utility model is:
A kind of wind speed harvester based on double frequency meter, air velocity transducer, signal conversion unit, scaling down processing unit, data selection unit, center control processing unit and are sequentially connected with, and are also associated with the power supply providing electric power to support into this harvester；Described wind speed harvester is for being converted to the signal of telecommunication by the wind velocity signal of acquisition, described signal conversion unit, scaling down processing unit and data selection unit control processing unit for the signal of telecommunication being processed and inputs to center, described center controls processing unit and controls the counting of the signal of telecommunication to be measured, decoding, frequency dividing ratio, the period/frequency of its timer internal/counter measures tested electric signals, calculates and obtains wind speed and direction data。
According to such scheme, being additionally provided with display, described display is connected to center and controls processing unit, is used for showing calculated wind speed and direction data。
According to such scheme, described center controls processing unit and is also sequentially connected with RS485 serial port chip, RS232/RS485 change-over circuit and PC。
According to such scheme, it is AT89C51 that described center controls the model of processing unit。
According to such scheme, the model of described display is LCD1602。
According to such scheme, the model of described RS485 serial port chip is MAX485。
Compared with prior art, the beneficial effects of the utility model are: add signal processing circuit in harvester, it is amplified to have gone correction, filtering and removed impurity etc. at input electrical signal waveform and processes, improve the signal to noise ratio of the signal of telecommunication, obtain higher certainty of measurement；The signal frequency precision that double frequency measures is used to be better than traditional measurement, it is achieved the equal precision measurement in whole frequency measurement district。
Accompanying drawing explanation
Fig. 1 is a kind of wind speed harvester structural representation based on double frequency meter of this utility model。
Fig. 2 is a kind of wind speed harvester fundamental diagram based on double frequency meter of this utility model。
Detailed description of the invention
The wind speed harvester based on double frequency meter of this utility model design can adapt to the frequency measurement in different range ability, dexterously by eliminate frequency measurement process produces ± 1 digital error, realize certainty of measurement unrelated with measured signal, so that the precision that whole measurement frequency range records is all equal。
As it is shown in figure 1, a kind of wind speed harvester based on double frequency meter, control processing unit, RS485 serial port chip and RS232/RS485 change-over circuit etc. including power supply, air velocity transducer, signal conversion unit, scaling down processing unit, data selection unit, center。Air velocity transducer, signal conversion unit, scaling down processing unit, data selection unit, center control processing unit and are sequentially connected with, and are also associated with the power supply providing electric power to support into this harvester。
Power supply provides suitable regulated power supply for whole harvester, and the center that is mainly controls processing unit, signal conversion unit and scaling down processing unit provides power supply, and voltage request is stable, noise is little。Which kind of waveform no matter the signal of telecommunication of input be, in the circuit run, because the imperfection of circuit design, the perfection of device and various external influence, all can allow the waveform of signal change by a small margin occur, arrange in harvester input signal processing part (namely signal conversion unit, scaling down processing unit, data selection unit), after waveform input signal is exaggerated, it is modified, filters and removes impurity etc. to process, improve the signal to noise ratio of signal, improve certainty of measurement。
The wind velocity signal of acquisition is converted to the signal of telecommunication by air velocity transducer, when frequency pulse signal is processed by center control processing unit, adopt double frequency measurement frequency method, the signal collected by air velocity transducer is sent to double frequency measurement frequency circuit input through signal processing, and frequency measurement circuit passes through the frequency measurement to wind speed pulse signal and then records wind speed。(frequency is 0-1221Hz to the pulse signal exported due to air velocity transducer, high level is more than 14V, low level is less than 1V), the center that can not directly input controls processing unit, need at input termination cascode level amplifying circuit, it is amplified small-signal processing, with this, voltage magnitude is adjusted to center and control within the voltage range that processing unit allows。Owing to the maximum output voltage of cascode level amplifying circuit is less than supply voltage, after cascode level amplifying circuit amplifies, signal becomes center and controls processing unit permission input voltage range, again this signal is received Schmidt trigger 74HC14 and carry out shaping filter, be converted to the square-wave pulse signal A that amplitude is fixing。This signal accesses scaling down processing unit, center of considering controls processing unit and uses external counting, when clock is 12MHz, maximum count speed is 500kHz, it is thus desirable to carry out outside frequency dividing, 74HC4017 can be adopted to carry out outside frequency dividing, and the signal after frequency dividing enters center after data selection unit and controls processing unit。
Center controls processing unit and selects model to be the single-chip microcomputer of AT89C51, completes the control of counting to measured signal, decoding, display and frequency dividing ratio, utilizes its timer internal/enumerator to complete the measurement of period/frequency of measured signal。Wherein double frequency measurement frequency schematic diagram is as in figure 2 it is shown, its measurement process is: double frequency two enumerator T of measurement amount frequency usage0And T1, respectively to reference clock signal fc and measured signal fx synchronous counting。First providing gate opening signal (preset gate rising edge), this hour counter does not start counting up, but until the rising edge of measured signal arrives, enumerator just really starts counting up；Then preset closing gate signal (trailing edge is then), enumerator does not stop counting at once, but just terminates counting until the rising edge of measured signal arrives, and completes one-shot measurement process。In order to ensure that gate opening time and measured signal are Tong Bu, add equally accurate time gate-control signal, for the actual opening time Tg of regulating gate, so that the opening and closing of actual signal strobe can keep synchronizing with measured signal impulse scaler。Owing to the gate time of double frequency meter Measuring Frequency Method is not fixed value, but the integral multiple in measured signal cycle, namely Tong Bu with measured signal, thus be excluded that to measured signal counting produced ± 1 counting error, reach the equal precision measurement in whole test frequency range。
In identical gate opening time Tg, measured signal (frequency is fx) is counted, is designated as Nx, clock signal (frequency is fc) is counted simultaneously, be designated as Nc。Result of calculation obtains: Nx=Tgfx, Nc=Tgfc, fx=Nxfc/Nc, and therefore, error formula is: e=Δ fx/fx=Δ Nx/Nx-Δ Nc/Nc+ Δ fc/fc, and in formula, first two represent enumerator T respectively0Sum counter T1Error, Section 3 is frequency accuracy。Owing to the actual gate opening time is Tong Bu with measured signal, namely Tg is the integral multiple in measured signal cycle, and therefore Nx is absent from ± 1 error, i.e. △ Nx/Nx=0 in measuring, and enumerator T0Pair time target counting, owing to the ratio Nc opening and closing the randomness in moment and Tg and Tc of gate Tg is non-integer (Tc is time mark cycle), therefore there is ± 1 error。When ignoring frequency accuracy error, maximum error is: e=± Δ Nc/Nc=± 1/Tgfc, this error formula illustrates that the relative error of frequency measurement is unrelated with the frequency of measured signal, it depends mainly on the size of gate time and standard signal frequency, gate time and standard signal frequency is selected when rationally, both can ensure certainty of measurement, measuring speed can have been improved again。Gate time is more long, and ticking frequency is more high, and resolution is more high。
Control after the process of processing unit data through center, the wind speed and direction data obtained are passed through liquid crystal display out, chip of LCD LCD1602 is a dot matrix type Liquid Crystal Module for showing letter, numeral, symbol etc., its significant advantage be low in energy consumption, volume is little, it is abundant in content to show and ultra-thin lightly etc.。Center is controlled processing unit by RS485 serial port chip and debugs by the debugging software in PC, only RS232 interface due to PC acquiescence, this harvester converts PC serial ports RS232 signal level to RS485 level signal by RS232/RS485 change-over circuit, it is achieved PC is by the data interaction of RS485 interface with single-chip microcomputer。The center control processing unit adopted in this utility model is model is the single-chip microcomputer of AT89C51, and RS485 serial port chip model is MAX485, and display model is LCD1602。
Claims (6)
1. the wind speed harvester based on double frequency meter, it is characterised in that air velocity transducer, signal conversion unit, scaling down processing unit, data selection unit, center control processing unit and be sequentially connected with, is also associated with the power supply providing electric power to support into this harvester；Described wind speed harvester is for being converted to the signal of telecommunication by the wind velocity signal of acquisition, described signal conversion unit, scaling down processing unit and data selection unit control processing unit for the signal of telecommunication being processed and inputs to center, described center controls processing unit and controls the counting of the signal of telecommunication to be measured, decoding, frequency dividing ratio, the period/frequency of its timer internal/counter measures tested electric signals, calculates and obtains wind speed and direction data。
2. a kind of wind speed harvester based on double frequency meter as claimed in claim 1, it is characterised in that be additionally provided with display, described display is connected to center and controls processing unit, is used for showing calculated wind speed and direction data。
3. a kind of wind speed harvester based on double frequency meter as claimed in claim 1, it is characterised in that described center controls processing unit and is also sequentially connected with RS485 serial port chip, RS232/RS485 change-over circuit and PC。
4. a kind of wind speed harvester based on double frequency meter as described in any one of claims 1 to 3, it is characterised in that it is AT89C51 that described center controls the model of processing unit。
5. a kind of wind speed harvester based on double frequency meter as claimed in claim 2, it is characterised in that the model of described display is LCD1602。
6. a kind of wind speed harvester based on double frequency meter as claimed in claim 3, it is characterised in that the model of described RS485 serial port chip is MAX485。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620079561.XU CN205333671U (en) | 2016-01-26 | 2016-01-26 | Wind speed collector based on dual -frenquency meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620079561.XU CN205333671U (en) | 2016-01-26 | 2016-01-26 | Wind speed collector based on dual -frenquency meter |
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| CN205333671U true CN205333671U (en) | 2016-06-22 |
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| CN201620079561.XU Expired - Fee Related CN205333671U (en) | 2016-01-26 | 2016-01-26 | Wind speed collector based on dual -frenquency meter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840440A (en) * | 2017-03-03 | 2017-06-13 | 成都信息工程大学 | A kind of Temperature sampler and temperature acquisition method based on MCU internal comparators |
| CN106908156A (en) * | 2017-03-09 | 2017-06-30 | 郑州艾斯亚生物科技有限公司 | A kind of high-speed pulse counting method and device |
| CN108535540A (en) * | 2018-05-08 | 2018-09-14 | 成都信息工程大学 | A kind of method of magnetron radar transmitter frequency transient measurement |
-
2016
- 2016-01-26 CN CN201620079561.XU patent/CN205333671U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840440A (en) * | 2017-03-03 | 2017-06-13 | 成都信息工程大学 | A kind of Temperature sampler and temperature acquisition method based on MCU internal comparators |
| CN106840440B (en) * | 2017-03-03 | 2023-07-28 | 成都信息工程大学 | Temperature collector based on MCU internal comparator and temperature collection method |
| CN106908156A (en) * | 2017-03-09 | 2017-06-30 | 郑州艾斯亚生物科技有限公司 | A kind of high-speed pulse counting method and device |
| CN108535540A (en) * | 2018-05-08 | 2018-09-14 | 成都信息工程大学 | A kind of method of magnetron radar transmitter frequency transient measurement |
| CN108535540B (en) * | 2018-05-08 | 2020-10-23 | 成都信息工程大学 | Method for instantaneously measuring transmitting frequency of magnetron radar |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160622 Termination date: 20170126 |