The present application discloses a correction circuit (140), the correction circuit comprising: a delay module (180) for generating a preset delay reference signal, a first window function module (101) for converting a reference signal into a converted reference signal, a second window function module (102) for converting the delayed reference signal into a converted delayed reference signal, a third window function module (103) for converting a preset delay reference signal into a converted preset delay reference signal, a first delay time calculation module generating a first to-be-corrected delay time by receiving the converted reference signal and the converted delay reference signal, a second delay time calculation module generating a second to-be-corrected delay time by receiving the converted reference signal and the converted preset delay reference signal, and a calculation module (190) for calculating a gain coefficient on the basis of the first to-be-corrected delay time andthe second to-be-corrected delay time.

Correction circuit and related signal processing circuit and chip

The ivnention realtes to a matching structure including a mini-horn array, an ultrasonic transducer, and an ultrasonic flow meter. A monolithic matching structure for use in an ultrasonic transducer. The matching structure includes a mini-horn array. The mini-horn array includes a back plate, a plurality of horns, and a front plate. The plurality of horns extend from the back plate. Each of the horns includes a base and a neck. The base is adjacent the back plate. The neck extends from the base. Transverse area of the base is larger than transverse area of the neck. The front plate is adjacent the neck of each of the horns.

Mario Kopunek

Papers

Ultrasonic wave air flow-meter and device for measuring waste gas flow of internal combustion engine and method for obtaining gas flow