| 摘要 |
PROBLEM TO BE SOLVED: To simplify constitution of a sensor unit, and to reduce a useless cost even when replacing the sensor unit, by providing in a measuring part a storage part for storing correction factors in every frequency. SOLUTION: This instrument is provided with the sensor unit 14 comprising a vibration receiving rod 4 for receiving an ultrasonic wave oscillated from an ultrasonic oscillator 2 via pure water 10, and comprising a piezoelectric element 6 for converting piezoelectrically ultrasonic vibration received by the rod 4, a measuring part 9 having the storage part 9a for storing the correction factors K1, k2 in the every frequency, for measuring a sound pressure value based on a voltage value converted by the piezoelectric element 6 of the sensor unit 14, for calculating a frequency of a sound pressure waveform thereof, and for correcting the sound pressure value by selecting the correction factors corresponding to the frequency from the storage part 9a and by using them, and a sound pressure display part 7 for displaying the sound value corrected by the measuring part 9. COPYRIGHT: (C)2004,JPO&NCIPI
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