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本文研究的气桥在气源变动时,能维持其原来的平衡状态且当气源要求负压而被测物周围有许多尘埃时,能防止其堵塞。本文根据气阻的近似特性△p=KQ~m研究气桥的平衡,结果是:若气桥两臂的指数比相等,则气源的变动不会影响该气桥的平衡。为防止桥路堵塞,设计了一种特殊桥路——交流偏置桥路,已在实践中获得了成功的应用。
The gas bridge studied in this paper can maintain its original equilibrium state when the gas source is fluctuating, and can prevent the blockage when the gas source requires negative pressure and there are many dusts around the object to be measured. According to the approximate characteristic of gas resistance △ p = KQ ~ m, the paper studies the balance of the gas bridge. The result is that if the exponential ratio of the two arms of the gas bridge is equal, the change of the gas source will not affect the balance of the gas bridge. In order to prevent the blockage of the bridge, a special bridge - AC bias bridge was designed and has been successfully applied in practice.