Measurement of Hydrogen Absorption Performance of NEG by Differential Pressure Methods
By improving the constant pressure method,the differential pressure method was proposed to test the hydrogen absorption performance of non-evaporable getter(NEG).A constant conductance element is installed between the gas room and the induction chamber to provide controllable inlet flow with micrometering valve.The sorption performance parameters of NEG can be calculated by measuring the pressure of induction chamber,gas room and reference chamber.The sorption performance of two NEG absorbers measured by the improved constant pressure method and differential pressure method were compared during sorption test.The results show that the sorption capacity measured by differential pressure method is 0.07268 Pa·L lower than that measured by improved constant pressure method.The suction of clean chamber wall leads to higher test results of the improved constant pressure method than the actual result,while the test results of the differential pressure method are not affected,and the results of the modified improved constant pressure method are close to those of the differential pressure method.The differential pressure method can obtain more accurate and effective performance parameters of getters.In the differential pressure method,the reference part and the experimental part are tested at the same time,which can shorten the test time and reduce the error caused by inlet controlling.
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