| 摘要 |
The present invention relates to apparatus and method for determining a characteristic, such as stiffness, of a log, stem, wood piece or other wood specimen. A wave generator produces a frequency varying signal which drives a transducer which is coupled to the specimen to impart a frequency varying acoustic wave into the specimen. A receiver sensor detects the resulting acoustic wave and a transmit sensor detects the output from the transducer. A characteristic response of the specimen is determined from the receiver sensor signal, transmit sensor signal and excitation signal using digital and analogue signal processing. The characteristic is determined from the characteristic response. |
