| 摘要 |
PROBLEM TO BE SOLVED: To detect a frequency, an amplitude and an acceleration of a vibration by a method wherein a signal spectrum that is generated on a quartz oscillator attached to an object to be inspected due to the external vibration. SOLUTION: A quartz oscillator 1 which is attached to an object to be inspected outputs an oscillating signal fo including side bands at both sides thereof due to an external vibration to form a signal of fo±nΔf ('Δf' represents a frequency of the external vibration and n=1, 2-∞). The signal from the quartz oscillator 1 is FM-detected by an FM-detector 2 and is amplified by an amplifier 3, then an amplitude of a signal with a maximum amplitude and difference in a frequency between two waves having close frequencies are measured by an amplitude/frequency measuring section 4. Data of the amplitude is inputted to an amplitude value calibrating section 5 and is verified with an amplitude calibration table to be calibrated to a real amplitude value. The calibrated amplitude value is the amplitude of the external vibration and the measured frequency is the frequency of the external vibration. The data of the frequency and amplitude is inputted to a data processing section 6 and an acceleration of the external vibration is calculated.
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