| Presentation | 2008-12-19 Practical Configuration and Design of Liquid Level Meter using the Flexural Vibrations in a Rod Kentaro NAKAMURA, Daisuke KOYAMA, Sadayuki UEHA, Kazumitsu NUKUI, Kenzo IKEDA, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Resonance frequency of a flexural vibrating rod is lowered by immersing the rod into fluid, because of the mass effect of the fluid acting on the rod. The authors have previously proposed to utilize the phenomena for liquid level meter. This report presents the development of electronic circuits for extracting the motional current and tracking the resonance frequency using the PLL (phase-locked-loop) scheme. The working principle of measuring liquid level, practical configuration of the vibrating rod, PLL circuit and the performance test as a level meter are described in this report. The rod is mounted in a screw to install into a shielded liquid gas cylinder. Two rectangular piezoelectric elements are bonded at the one end of the rod, which is located outside the cylinder and excite the flexural vibration in the rod via the screw. The phase of the motional current detected by a bridge circuit using an operation amplifier is compared with the driving voltage so that the frequency of a voltage-controlled oscillator may track the resonance of the rod. The measurement characteristics of the stainless steel rods of 475mm in length and 6mm in diameter are evaluated. Error was 1-2% from the linear line. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Level meter / Flexural vibration / Resonance frequency / Phase-locked loop |
| Paper # | US2008-67 |
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| Committee | US |
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| Conference Date | 2008/12/12(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Ultrasonics (US) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Practical Configuration and Design of Liquid Level Meter using the Flexural Vibrations in a Rod |
| Sub Title (in English) | |
| Keyword(1) | Level meter |
| Keyword(2) | Flexural vibration |
| Keyword(3) | Resonance frequency |
| Keyword(4) | Phase-locked loop |
| 1st Author's Name | Kentaro NAKAMURA |
| 1st Author's Affiliation | Precision and Intelligence Lab., Tokyo Inst., of Tech.() |
| 2nd Author's Name | Daisuke KOYAMA |
| 2nd Author's Affiliation | Precision and Intelligence Lab., Tokyo Inst., of Tech. |
| 3rd Author's Name | Sadayuki UEHA |
| 3rd Author's Affiliation | Precision and Intelligence Lab., Tokyo Inst., of Tech. |
| 4th Author's Name | Kazumitsu NUKUI |
| 4th Author's Affiliation | Japan Applied Flow Corp. |
| 5th Author's Name | Kenzo IKEDA |
| 5th Author's Affiliation | Taiyo Nippon Sanso Corp. |
| Date | 2008-12-19 |
| Paper # | US2008-67 |
| Volume (vol) | vol.108 |
| Number (no) | 364 |
| Page | pp.pp.- |
| #Pages | 6 |
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