发明名称 |
Microwave measurement of the mass of frozen hydrogen pellets |
摘要 |
A nondestructive apparatus and method for measuring the mass of a moving object, based on the perturbation of the dielectric character of a resonant microwave cavity caused by the object passing through the cavity. An oscillator circuit is formed with a resonant cavity in a positive feedback loop of a microwave power amplifier. The moving object perturbs the resonant characteristics of the cavity causing a shift in the operating frequency of the oscillator proportional to the ratio of the pellet volume to the volume of the cavity. Signals from the cavity oscillation are mixed with a local oscillator. Then the IF frequency from the mixer is measured thereby providing a direct measurement of pellet mass based upon known physical properties and relationships. This apparatus and method is particularly adapted for the measurement of frozen hydrogen pellets.
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申请公布号 |
US4899100(A) |
申请公布日期 |
1990.02.06 |
申请号 |
US19880226571 |
申请日期 |
1988.08.01 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE UNITED STATES DEPARTMENT OF ENERGY |
发明人 |
TALANKER, VERA;GREENWALD, MARTIN |
分类号 |
G01G19/03 |
主分类号 |
G01G19/03 |
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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