发明名称 |
Ultrasonic flow velocity measuring method |
摘要 |
An ultrasonic flow velocity measuring method using a transit time difference of continuous sine waves without transmitting/receiving an ultrasonic pulse comprises steps of amplitude-modulating a continuous ultrasonic sine wave carrier into a lower frequency and transiting the amplitude-modulated signal, whenever the ultrasonic transit time is measured; demodulating the amplitude-modulated signal; detecting or discriminating the amplitude-modulated signal from the demodulated signal and measuring a time interval from the moment that the ultrasonic sine wave is amplitude-modulated till the amplitude-modulated signal is demodulated.
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申请公布号 |
US6470757(B2) |
申请公布日期 |
2002.10.29 |
申请号 |
US20010793730 |
申请日期 |
2001.02.27 |
申请人 |
CHANG HAK SOO;CHANG MIN TECH CO., LTD. |
发明人 |
CHANG HAK SOO |
分类号 |
G01F1/66;G01M15/00;(IPC1-7):G01F1/66 |
主分类号 |
G01F1/66 |
代理机构 |
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地址 |
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