| 摘要 |
PURPOSE:To measure a microweight load a microdisplacement applied to a vibration board by attaching two pieces of piezoelectric element on the both sides of a vibration board whose both ends are free, vibrating one of the piezolectric elements through the medium of an oscillator and detecting a vibrating through the other piezoelectric element. CONSTITUTION:A vibration board 1 whose both ends are free, the first piezoelectric element 3 attached on one surface of the said board, e.g. with the help of an adhesive, an oscillator 4 which applies an electric signal to the said element, the second piezoelectric element 4 attached on the other surface of the board 1 for detecting a vibration through the board 1 where the piezoelectric element 3 is attached, and a voltmeter 6 for reading an electric output from the element 5, are the consituents of the device. A vibration applied through the piezoelectric element 1 is significantly influenced by resonance properties, if an external force such as microload, etc. is applied to the vibration board 1, and appears in the form of an detection output from the second piezoelectric element. Under this constitution, it is possible to realize a detection device capable of a high-sensitivity detection and a wide-band detection and low electric consumption and satisfactory transient properties for the detection of microweight load, microdisplacement, etc. |
