Anti-interference device and method for ultrasonic anemometer based on non-natural frequency excitation

Abstract

The invention discloses an ultrasonic wave anemoscope anti-interference device and method based on non-intrinsic frequency excitation. The ultrasonic wave anemoscope anti-interference device is formed by a transducer intrinsic frequency test module, a non-intrinsic frequency transducer excitation source and a high-attenuation-rate narrow-band-pass filter. The method includes the steps of obtaining the intrinsic frequency of a transducer system through a frequency scanning method, selecting the frequency close to but not equal to the intrinsic frequency of the transducer system as the signal frequency of normal operation, selecting the oval high-attenuation-rate narrow-band-pass filter, and removing noise signals such as sounds, abnormal sounds and whistlers produced by external interference in the surrounding environment of a ultrasonic anemograph out of the normal signals achieving measurement of wind speed and wind directions. The ultrasonic wave anemoscope anti-interference device and method based on the non-intrinsic frequency excitation are capable of effectively avoiding influence of the external noises on the ultrasonic anemograph and ensuring measurement accuracy of the ultrasonic anemograph, and are easy to use and capable of being widely applied to a two-dimensional ultrasonic anemograph and a three-dimensional ultrasonic anemograph.

Description

technical field [0001] The present invention relates to an anti-interference device and method for an ultrasonic anemometer, especially an anti-interference device and method for an ultrasonic anemometer based on non-natural frequency excitation. The natural frequency of the transducer system is obtained by frequency scanning. Select a frequency that is adjacent to but not equal to the natural frequency of the transducer system as the normal working signal frequency, and select an elliptical filter with a high attenuation rate and a narrow passband to reduce the sound, abnormal noise, The noise signal generated by external interference such as howling is eliminated from the normal signal for wind speed and wind direction measurement, so as to avoid the influence of external noise on the ultrasonic anemometer. Background technique [0002] Wind speed and wind direction are important parameters in meteorology, and the measurement accuracy of these two parameters directly affec...

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Problems solved by technology

However, these filter methods have an inherent disadvantage: although the filter can filter out the noise interference other than the natural frequency of the transducer system, since the working frequency of the normal signal is equal to the natural frequency of the transducer system, in order to ensure the normal signal The strength of the filter will also be unable to filter out the noise signal with the same frequency as the natural frequency of the transducer

However, in order to realize this modern filtering method, the controller of the ultrasonic anemometer usually requires powerful computing and data processing capabilities, which will not only directly increase the economic cost of the controller, but also greatly increase the power consumption of the ultrasonic anemometer

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