Method for correcting measurement error due to temperature displacement of measuring apparatus and mass spectrometer using the method

摘要

A cylindrical rod-shaped reference member (5) made of a material having a coefficient of thermal expansion different from that of the flight tube (2) is placed in contact with the tube (2), and one end of the tube (2) and the reference member (5) is attached. Fix with the fixing part (6). The distance measuring sensor (7) measures the difference between the lengths of the tube (2) and the reference member (5) that fluctuate due to temperature changes. The displacement of this length difference is larger than the displacement of the length of the flight tube (2) itself in terms of the ratio. Further, the difference in length is much smaller than the length of the flight tube (2) itself. Therefore, the displacement due to thermal expansion can be captured with high accuracy while using an inexpensive sensor such as a strain gauge, and the m / z value of the mass spectrum data is corrected based on this measurement value. Mass deviation correction can be performed.