Abstract
To address the issue of timing errors caused by attenuation and jitter in the echo signal with the conventional threshold method, this paper presents a signal processing method for ultrasonic gas flow meters based on the mathematical characteristics of transit time. First, an improved weighted recursive filtering algorithm based on the mathematical characteristics of transit time is proposed. Then,based on the aforementioned filtering algorithm, a feedback-type threshold adjustment method has been proposed. Finally, the results for the flow meter meeting the performance criteria for a Class 1 accuracy ultrasonic gas flow meter at range of 2∼300 m3/h. This signal processing technique can be implemented at comparatively low cost on existing conventional fixed-threshold flow measurement infrastructures, with the potential to significantly improve accuracy and reliability.
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