| 摘要 |
A low impedance amplifier include a matching circuit composed of passive elements and active elements for matching the input impedance of the amplifier to a piezoelectric and/or pyroelectric signal generated in a low impedance structure; and an amplifying circuit composed of passive elements and active elements for amplifying the input signal simultaneously as the impedance matching. The amplifier is capable of electrically amplifying low impedance electrical phenomena. Accordingly, the amplifier permits accurate detection of structural abnormality in various structures. As one application example of the above amplifier to structural abnormality detection, a method of applying the amplifier of the present invention to a musical instrument enables any existing musical instrument to be used as an electric instrument without changing its original sound quality and provides the possibility of realizing a new instrument.
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