CN103558410B - Based on the jamproof device and method of ultrasonic wind velocity indicator that extrinsic frequency excites - Google Patents
Based on the jamproof device and method of ultrasonic wind velocity indicator that extrinsic frequency excites Download PDFInfo
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Abstract
The invention discloses a kind of ultrasonic wind velocity indicator means for anti-jamming of exciting based on extrinsic frequency and method.Jointly realized by transducer natural frequency test module, extrinsic frequency transducer excitaton source, high attenuation rate narrow-band pass filter.The natural frequency of transducer system is obtained by frequency sweep mode, select but unequal frequency adjacent with transducer system natural frequency as the signal frequency normally worked, and select the elliptic filter of high attenuation rate, narrow passband, by the noise signal that the sound in ultrasonic wind velocity indicator surrounding environment, abnormal sound, the external interference such as to utter long and high-pitched sounds produce, from realizing rejecting normal signal that wind speed and direction measures.The present invention can effectively avoid outside noise on the impact of ultrasonic wind velocity indicator, ensures the measuring accuracy of ultrasonic wind velocity indicator, uses simple, and can be widely used on two-dimensional ultrasonic anemoscope and three-dimensional ultrasonic anemoscope.
Description
Technical field
The present invention relates to a kind of for the jamproof device and method of ultrasonic wind velocity indicator, especially a kind of jamproof device and method of ultrasonic wind velocity indicator excited based on extrinsic frequency, the natural frequency of transducer system is obtained by frequency sweep mode, select but unequal frequency adjacent with transducer system natural frequency as the signal frequency normally worked, and select high attenuation rate, the elliptic filter of narrow passband, by the sound in ultrasonic wind velocity indicator surrounding environment, abnormal sound, the noise signal that the external interference such as to utter long and high-pitched sounds produces is from realizing rejecting normal signal that wind speed and direction measures, thus avoid outside noise on the impact of ultrasonic wind velocity indicator.
Background technology
Wind speed and direction is the important parameter in meteorology, and the measurement precision of these two parameters directly has influence on the accuracy of weather forecast.Ultrasonic wind velocity indicator is a kind of novel wind speed and direction surveying instrument.During work, ultrasonic wind velocity indicator applies excitation signal at transmitting transducer end, makes transmitting transducer outwards launch ultrasound beamformer.Ultrasound beamformer is propagated in atmosphere, after a predetermined time, arrives receiving transducer end, makes receiving transducer produce corresponding Received signal strength.When the wind speed of surrounding environment is larger, the velocity of propagation of ultrasound beamformer is just fast, and the travel-time arriving receiving transducer is just short, on the contrary, when the wind speed of surrounding environment is less, the velocity of propagation of ultrasound beamformer is just slow, and the travel-time arriving receiving transducer is just long.Thus ultrasonic wind velocity indicator just by the travel-time between metering excitation signal and Received signal strength, can determine the wind speed and direction of surrounding environment.Ultrasonic wind velocity indicator has the advantages such as measuring accuracy is high, measurement range is wide, low-power consumption, and therefore, ultrasonic wind velocity indicator is widely used in electric power, iron and steel, petrochemical industry, the industry such as energy-conservation.
For realizing the low power capabilities of ultrasonic wind velocity indicator, and ensure signal intensity during ultrasonic wind velocity indicator measuring wind simultaneously, ultrasonic wind velocity indicator often selects the natural frequency of transducer system (comprising transmitting transducer and receiving transducer) as the frequency of operation of signal excitation and Signal reception, the i.e. excitation signal frequency of transmitting transducer, and the Received signal strength frequency of receiving transducer, all equal the natural frequency of transducer system.
Ultrasonic wind velocity indicator frequency of operation equals the feature of transducer system natural frequency, makes ultrasonic wind velocity indicator in actual use, the interference of the sound being very easily subject to existing in surrounding environment, abnormal sound, the outside noise such as to utter long and high-pitched sounds.This is determined by the work characteristics of transducer system.The effect of transducer realizes sound and electric signal is changed mutually, and therefore transducer is the most key sensor in ultrasonic wind velocity indicator.When the external world produces noise, transducer will be responded to some extent to these noises, and these noises are converted to electric signal.Relative to normal Received signal strength, the electric signal caused by noise, ultrasonic wind velocity indicator will be made to take for ultrasound beamformer shift to an earlier date or delay arrival receiving transducer, and cause the erroneous metrology to the ultrasound beamformer travel-time, thus cause ultrasonic wind velocity indicator to the measuring error of wind speed and direction.Outside noise interference will have influence on the measuring accuracy of ultrasonic wind velocity indicator, even cause ultrasonic wind velocity indicator normally to work time serious.
For avoiding outside noise to disturb impact on the measuring accuracy of ultrasonic wind velocity indicator, the mode of the wave filter such as generally adopt low pass, high pass, band to lead to is to improve the antijamming capability of ultrasonic wind velocity indicator.But, these wave filter modes also exist an inherent defect: although wave filter can filter out the noise outside transducer system natural frequency, but because the frequency of operation of normal signal is equal with transducer system natural frequency, therefore for ensureing the intensity of normal signal, wave filter also cannot filter out the frequency noise signal identical with transducer natural frequency.
For avoiding the interference of outside noise, also the modern filtering method based on numerical evaluation can be adopted, by various mathematical method and statistical law, estimate the intensity of the frequency noise signal identical with transducer natural frequency, thus noise signal is rejected inside normal signal.But for realizing this modern filtering method, usually require that the controller of ultrasonic wind velocity indicator has powerful computing power and data-handling capacity, this not only directly can improve the financial cost of controller, also significantly can promote the power consumption of ultrasonic wind velocity indicator.
Summary of the invention
The object of this invention is to provide a kind of ultrasonic wind velocity indicator means for anti-jamming excited based on extrinsic frequency, jointly realized by transducer natural frequency test module, extrinsic frequency transducer excitaton source, high attenuation rate narrow-band pass filter;
Another object of the present invention is to provide a kind of ultrasonic wind velocity indicator anti-interference method excited based on extrinsic frequency, the natural frequency of transducer system is obtained by frequency sweep mode, select but unequal frequency adjacent with transducer system natural frequency as the signal frequency normally worked, and select high attenuation rate, the elliptic filter of narrow passband, by the sound in ultrasonic wind velocity indicator surrounding environment, abnormal sound, the noise signal that the external interference such as to utter long and high-pitched sounds produces, reject from the normal signal realizing wind speed and direction measurement, thus avoid outside noise on the impact of ultrasonic wind velocity indicator.
For achieving the above object, present invention employs following technical scheme:
A kind of jamproof device of ultrasonic wind velocity indicator excited based on extrinsic frequency, it is characterized in that, comprise the first transmitting transducer of ultrasonic wind velocity indicator, second transmitting transducer, first receiving transducer and the second receiving transducer, also comprise transducer natural frequency test module, extrinsic frequency transducer excitaton source and high attenuation rate narrow-band pass filter, wherein, the signal output part of described transducer natural frequency test module connects the signal input part of the first transmitting transducer and the second transmitting transducer, the signal input part of described transducer natural frequency test module connects the signal output part of the first receiving transducer and the second receiving transducer, the signal output part of described extrinsic frequency transducer excitaton source connects the signal input part of the first transmitting transducer and the second transmitting transducer, the signal output part of described high attenuation rate narrow-band pass filter connects the signal input part of the first receiving transducer and the second receiving transducer.
Optimize as a supplement, described high attenuation rate narrow-band pass filter is ellipse bandpass filter.
Optimize as a supplement, described transducer natural frequency test module is made up of excite amplification module, control module, the signal receiving module connected successively.Frequency test module, namely common frequency-sweeping apparatus.
The ultrasonic wind velocity indicator anti-interference method utilizing said apparatus to excite based on extrinsic frequency, is characterized in that, comprise the following steps:
Step one, obtains the natural frequency of transducer system by frequency sweep mode; The transducer nominal frequency of setting ultrasonic wind velocity indicator (1) is f
mark, the sinusoidal signal that transducer natural frequency test module signal output part changes with the mode transmission frequency of frequency sweeping, the frequency sweeping ranges of described sinusoidal signal is (f
mark-5) KHz is to (f
mark+ 5) KHz; During frequency sweeping, frequency increase per second 0.5KHz; In this frequency sweeping process, transducer natural frequency test module signal receiving end synchronously receives and records the signal amplitude of reception first receiving transducer and the output of the second receiving transducer; After frequency sweeping process terminates, stimulating frequency corresponding when the signal amplitude that transducer natural frequency test module automatic decision receives is maximum, and using the natural frequency of this stimulating frequency as transducer system, be set to f
gu, and be stored in transducer natural frequency test module;
Step 2, selects and transducer system natural frequency f
guadjacent but unequal frequency is as the signal frequency of normal work; The excitation signal that described extrinsic frequency transducer excitaton source exports is sinusoidal signal, and the frequency of this sinusoidal signal excited is set to f
swash, f
swashfrequency range be (f
gu-1.5) KHz is to (f
gu-3.5) between KHz;
Step 3, utilizes the undesired signal that the high attenuation rate narrow pass filter rejecting outside noise equal with natural frequency causes; The centre frequency setting the narrow pass filter of high attenuation rate is f
filter, f
filter=f
swash, thus the excitation signal f that normally works can be ensured
swashlow decay pass through, ensure outside noise and natural frequency f simultaneously
guthe height decay cut-off of the undesired signal that frequency is equal.
Optimize as a supplement, the narrow pass filter of described high attenuation rate can be active filter or passive filter.Wave filter is generally divided into two kinds, active filter and passive filter.During wave filter work, need to connect external power source, be called active filter; Otherwise, during wave filter work, without the need to connecing external power source, be called passive filter.Generally speaking, active filter carrying load ability is a little strong, but passive filter uses more more convenient.
Invention advantage:
(1) the present invention effectively can eliminate outside noise and ultrasonic wind velocity indicator normally be measured to the interference caused, and method cost of the present invention is lower simultaneously, and during work, power consumption is also lower.
(2) wave filter of the present invention can be realized by passive or active mode, and filtering does not relate to complicated mathematical computations, and application is simple, and reliability is high.
(3) the present invention can be used in random two-dimensional formula ultrasonic wind velocity indicator, three-dimension type ultrasonic wind velocity indicator.
Accompanying drawing explanation
Fig. 1 is that the implementation system of device of the present invention is always schemed.
Fig. 2 is transducer natural frequency inside modules functional block diagram.
Fig. 3 is ultrasonic wind velocity indicator transducer system frequency sweeping test result figure.
Fig. 4 is operating frequency range figure selected in the method for the invention.
Fig. 5 is the filtering performance figure of the elliptic filters mentioned in the method for the invention.
In figure: 1, ultrasonic wind velocity indicator, 2A, 2B, ultrasonic wind velocity indicator transmitting transducer, 3A, 3B, ultrasonic wind velocity indicator receiving transducer, 4, transducer natural frequency test module, 4A, excite amplification module, 4B, control module, 4C, signal receiving module, 5, extrinsic frequency transducer excitaton source, 6, high attenuation rate narrow-band pass filter.
Embodiment
Below in conjunction with accompanying drawing and a preferred embodiment, technical scheme of the present invention is further described.
Embodiment:
As shown in Fig. 1 ~ Fig. 2: the present embodiment a kind of jamproof device of ultrasonic wind velocity indicator excited based on extrinsic frequency of disclosing, comprise the first transmitting transducer 2A of ultrasonic wind velocity indicator 1, second transmitting transducer 2B, first receiving transducer 3A and the second receiving transducer 3B, also comprise transducer natural frequency test module 4, extrinsic frequency transducer excitaton source 5 and high attenuation rate narrow-band pass filter 6, wherein, the signal output part of described transducer natural frequency test module 4 connects the signal input part of the first transmitting transducer 2A and the second transmitting transducer 2B, the signal input part of described transducer natural frequency test module 4 connects the signal output part of the first receiving transducer 3A and the second receiving transducer 3B, the signal output part of described extrinsic frequency transducer excitaton source 5 connects the signal input part of the first transmitting transducer 2A and the second transmitting transducer 2B, the signal output part of described high attenuation rate narrow-band pass filter 6 connects the signal input part of the first receiving transducer 3A and the second receiving transducer 3B.
Described high attenuation rate narrow-band pass filter 6 is ellipse bandpass filter.
Described transducer natural frequency test module 4 by connect successively excite amplification module 4A, control module 4B, signal receiving module 4C forms.Wherein, excite the output terminal of amplification module 4A to be connected to the first transmitting transducer 2A of ultrasonic wind velocity indicator and the signal input part of the second transmitting transducer 2B, signal receiving module 4C is connected to the first receiving transducer 3A of ultrasonic wind velocity indicator and the signal output part of the second receiving transducer 3B.
The ultrasonic wind velocity indicator anti-interference method utilizing said apparatus to excite based on extrinsic frequency, comprises the following steps:
Step one: the application prerequisite of the method for the invention, is exactly in the natural frequency measuring ultrasonic wind velocity indicator transducer system.Transducer natural frequency test module 4 is established for realizing above-mentioned functions exactly.When ultrasonic wind velocity indicator Default Value, under the control of transducer natural frequency test module 4 control module 4B therein, by exciting amplification module 4A, the sinusoidal signal changed to the first transmitting transducer 2A and the second transmitting transducer 2B transmission frequency in the mode of frequency sweeping.For improving testing efficiency, the frequency scanned should have certain scope.In the application of the method for the invention, the lower limit of frequency sweeping ranges is that transducer dispatches from the factory nominal frequency f mark-5KHz, the higher limit of frequency sweeping ranges is that transducer dispatches from the factory nominal frequency f mark+5KHz, and during frequency sweeping, frequency is with the 0.5KHz velocity variations of increase per second.In frequency sweeping process, the first receiving transducer 3A and the second receiving transducer 3B of ultrasonic wind velocity indicator 1 will produce corresponding sinusoidal signal, and signal amplitude changes with the change of stimulating frequency.The signal amplitude that collection first receiving transducer 3A and the second receiving transducer 3B exports by the signal receiving module 4C in transducer natural frequency test module 4, and it is inner signal amplitude to be stored into control module 4B.After frequency sweeping process terminates, stimulating frequency corresponding when the signal amplitude that automatic decision receives by control module 4B is maximum, as shown in Figure 3, and this stimulating frequency is solid as up-to-date anemoscope transducer natural frequency f, be stored in control module 4B.
Step 2: as shown in Figure 4, method of the present invention, when practical application, need determine the frequency of operation of transducer system in ultrasonic wind velocity indicator, i.e. the frequency of extrinsic frequency transducer excitaton source 5 output signal.Frequency of operation is chosen in the scope of little 1.5KHz to 3.5KHz more solid than ultrasonic wind velocity indicator natural frequency f by method of the present invention, and namely the frequency f of extrinsic frequency transducer excitaton source 5 to the excitation signal of the first transmitting transducer 2A and the second transmitting transducer 2B swashs between (f solid-1.5) KHz to (f solid-3.5) KHz.Choosing of above-mentioned operating frequency range, both the transducer system natural frequency of requirement the method for the invention is not equal to to(for) frequency of operation had been met, fully take into account again frequency of operation and leave transducer system natural frequency too far, by the problem causing transducer too low to the excitation response under frequency of operation.Meanwhile, choosing of above-mentioned operating frequency range, also fully take into account frequency of operation from transducer system natural frequency too close to, will the bandwidth of follow-up narrow band filter be caused narrow, thus cause the realization of wave filter too difficult.
Simultaneously, for ensureing that the Received signal strength amplitude of the first receiving transducer 3A under selected frequency of operation and the second receiving transducer 3B is obviously greater than the white noise signal amplitude caused by ambient noise, the amplitude of the exciting voltage signal under selected frequency of operation answers corresponding lifting, generally can be promoted to 130% ~ 150% of the rated operational voltage of the first transmitting transducer 2A and the second transmitting transducer 2B nominal, but be advisable with the maximum working voltage being no more than the first transmitting transducer 2A and the second transmitting transducer 2B nominal simultaneously.
Step 3: as shown in Figure 5, high attenuation rate narrow-band pass filter 6 required in method of the present invention is ellipse bandpass filter, and its centre frequency f filter equals selected frequency of operation f and swashs, and bandwidth is 2KHz.High attenuation rate narrow-band pass filter 6 of the present invention, should ensure that the low decay of normal working signal is passed through, and ensures that height that is that noise causes and the undesired signal of frequency and natural frequency f solid phase etc. is decayed simultaneously and ends.High attenuation rate narrow-band pass filter 6 of the present invention can the mode of active filter or the mode of passive filter realize.
The principle of work of the method for the invention and the course of work are: extrinsic frequency transducer excitaton source 5 exports sinusoidal excitation signal f and swashs, and the natural frequency f that the frequency of this sinusoidal signal is not equal to ultrasonic wind velocity indicator transducer system is solid.This sinusoidal excitation signal f swashs and is applied to after on the first transmitting transducer 2A and the second transmitting transducer 2B, and the first transmitting transducer 2A and the second transmitting transducer 2B is by generation and launch ultrasound beamformer.After ultrasound beamformer arrives the first receiving transducer 3A and the second receiving transducer 3B, generation frequency is swashed equal sinusoidal Received signal strength with excitation signal frequency f by the first receiving transducer 3A and the second receiving transducer 3B.Because the frequency of above-mentioned sinusoidal Received signal strength is filtered equal with the centre frequency f of elliptic filters 6, and the frequency of sinusoidal Received signal strength is positioned within the bandwidth of elliptic filters 6, therefore, sinusoidal Received signal strength will by elliptic filters 6, be input to ultrasonic wind velocity indicator 1 inner, to calculate the wind speed and direction of surrounding environment.When sound, the abnormal sound in the external world, the external interference such as to utter long and high-pitched sounds cause the first receiving transducer 3A and the second receiving transducer 3B to produce noise signal, the natural frequency f that frequency due to noise signal equals transducer system is solid, simultaneously because the frequency of noise signal is not equal to the centre frequency f filter of elliptic filters 6, and the frequency of noise signal is positioned at outside the bandwidth of high attenuation rate narrow-band pass filter 6, therefore, noise signal cannot by high attenuation rate narrow-band pass filter 6.Thus method of the present invention, successfully eliminates the interference that outside noise normally works to ultrasonic wind velocity indicator 1.
It is to be noted; as described above is only the preferred embodiment explaining the present invention; not attempt does any restriction in form to the present invention according to this; be with; all any modification or changes having the relevant the present invention that does under identical invention spirit, all must be included in the category that the invention is intended to protection.
Claims (5)
1. the jamproof device of ultrasonic wind velocity indicator excited based on extrinsic frequency, it is characterized in that, comprise first transmitting transducer (2A) of ultrasonic wind velocity indicator (1), second transmitting transducer (2B), first receiving transducer (3A) and the second receiving transducer (3B), also comprise transducer natural frequency test module (4), extrinsic frequency transducer excitaton source (5) and high attenuation rate narrow-band pass filter (6), wherein, the signal output part of described transducer natural frequency test module (4) connects the signal input part of the first transmitting transducer (2A) and the second transmitting transducer (2B), the signal input part of described transducer natural frequency test module (4) connects the signal output part of the first receiving transducer (3A) and the second receiving transducer (3B), the signal output part of described extrinsic frequency transducer excitaton source (5) connects the signal input part of the first transmitting transducer (2A) and the second transmitting transducer (2B), the signal output part of described high attenuation rate narrow-band pass filter (6) connects the signal input part of the first receiving transducer (3A) and the second receiving transducer (3B), select and transducer system natural frequency f
guadjacent but unequal frequency is as the signal frequency of normal work, the excitation signal that described extrinsic frequency transducer excitaton source (5) exports is sinusoidal signal, and the frequency of this sinusoidal signal excited is set to f
swash, f
swashfrequency range be (f
gu-1.5) KHz is to (f
gu-3.5) between KHz.
2. the jamproof device of ultrasonic wind velocity indicator excited based on extrinsic frequency according to claim 1, is characterized in that, described high attenuation rate narrow-band pass filter (6) is ellipse bandpass filter.
3. the jamproof device of ultrasonic wind velocity indicator excited based on extrinsic frequency according to claim 2, it is characterized in that, described transducer natural frequency test module (4) is made up of excite amplification module (4A), control module (4B), the signal receiving module (4C) connected successively.
4. utilize the ultrasonic wind velocity indicator anti-interference method that device excites based on extrinsic frequency as described in any one of claims 1 to 3, it is characterized in that, comprise the following steps:
Step one, obtains the natural frequency of transducer system by frequency sweep mode; The transducer nominal frequency of setting ultrasonic wind velocity indicator (1) is f
mark, the sinusoidal signal that transducer natural frequency test module (4) signal output part changes with the mode transmission frequency of frequency sweeping, the frequency sweeping ranges of described sinusoidal signal is (f
mark-5) KHz is to (f
mark+ 5) KHz; During frequency sweeping, frequency increase per second 0.5KHz; In this frequency sweeping process, transducer natural frequency test module (4) signal receiving end synchronously receives and records the signal amplitude that reception first receiving transducer (3A) and the second receiving transducer (3B) export; After frequency sweeping process terminates, stimulating frequency corresponding when the signal amplitude that transducer natural frequency test module (4) automatic decision receives is maximum, and using the natural frequency of this stimulating frequency as transducer system, be set to f
gu, and be stored in transducer natural frequency test module (4);
Step 2, selects and transducer system natural frequency f
guadjacent but unequal frequency is as the signal frequency of normal work; The excitation signal that described extrinsic frequency transducer excitaton source (5) exports is sinusoidal signal, and the frequency of this sinusoidal signal excited is set to f
swash, f
swashfrequency range be (f
gu-1.5) KHz is to (f
gu-3.5) between KHz;
Step 3, utilizes the undesired signal that high attenuation rate narrow-band pass filter (6) the rejecting outside noise equal with natural frequency causes; The centre frequency setting high attenuation rate narrow-band pass filter (6) is f
filter, f
filter=f
swash, thus the excitation signal f that normally works can be ensured
swashlow decay pass through, ensure outside noise and natural frequency f simultaneously
guthe height decay cut-off of the undesired signal that frequency is equal.
5. the ultrasonic wind velocity indicator anti-interference method excited based on extrinsic frequency according to claim 4, is characterized in that, described high attenuation rate narrow-band pass filter (6) can be active filter or passive filter.
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| CN105319389B (en) * | 2015-12-07 | 2019-01-01 | 吉林大学 | A kind of high precision wide range ultrasound wind system and method |
| CN106771347B (en) * | 2016-12-30 | 2019-08-09 | 内蒙古工业大学 | A kind of frequency sweep type ultrasonic wind measurement method |
| CN113671215B (en) * | 2021-07-30 | 2024-02-20 | 苏州斯威高科信息技术有限公司 | Measurement and calibration method and system for improving accuracy of ultrasonic wind sensor |
| CN114370931B (en) * | 2022-01-10 | 2024-05-03 | 江苏无线电厂有限公司 | Method for rapidly calculating frequency of ultrasonic transducer |
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