CORRECTION METHOD AND APPARATUS FOR ULTRASONIC ANEMOGRAPH

摘要

A correction method and apparatus for an ultrasonic anemograph. The correction method comprises: calculating the propagation speed Cair of an ultrasonic wave; processing a signal received in a direction from a transducer n to a transducer s, so as to obtain an arrival time t_ns1 of a direct wave and an arrival time t_ns2 of a primary echo; calculating a propagation time tofns of the ultrasonic wave and a system delay dtns according to t_ns1 and t_ns2; processing a signal received in a direction from the transducer s to the transducer n, so as to obtain an arrival time t_sn1 of the direct wave and an arrival time t_sn2 of the primary echo; calculating a propagation time tofsn of the ultrasonic wave and the system delay dtsn according to t_sn1 and t_sn2; and respectively calculating the distance dns between the transducer n and the transducer s and the distance dsn between the transducer s and the transducer n, calculating the error Δd between the two distances dns and dsn, and comparing the error Δd with a preset threshold value thd to determine the distance between the transducers and the state of a sealing cavity. According to the correction method, both the distance between transducers and a system delay can be corrected at the same time, and it can be ensured that correction is performed in a windless environment, thereby improving the correction accuracy for an ultrasonic anemograph.