发明名称 |
WATER LEVEL GAGE |
摘要 |
PURPOSE:To measure water level continuously and accurately by determining the pipe length above the water surface based on the sound in the pipe picked up through a microphone. CONSTITUTION:Sound in a pipe 2 is picked up through a microphone 1 and delivered to an input unit 5 at a data processing section 4. Data is delivered with very short duration from the input unit 5 through two Fourier transform units 6, 6 to a surpass period interval operating unit 7 where a surpass period interval 4t is operated and fed to a pipe length operating unit 8. The pipe length operating unit 8 determines a pipe length l from the interval DELTAt and a sound speed (v) according to a formula l=DELTAt.v/2. A water level operating unit 9 determines a water level based on the pipe length l thus operated and produces information or alarm as required. |
申请公布号 |
JPH0643007(A) |
申请公布日期 |
1994.02.18 |
申请号 |
JP19920218566 |
申请日期 |
1992.07.24 |
申请人 |
RAILWAY TECHNICAL RES INST |
发明人 |
NAKAMURA YUTAKA;TOMITA KENJI;TAKIZAWA TARO;SAIDA ATSUSHI |
分类号 |
G01B17/00;G01F23/28;(IPC1-7):G01F23/28 |
主分类号 |
G01B17/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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