Abstract
The characteristics of a pre-flight model of the Skylab BMMD (Body Mass Measurement Device), which was made around 1970 by the team led by Dr. William Thornton, are accurately evaluated using an optical interferometer on ground. The calibration of the BMMD is conducted using metal block weights in the range of the total mass of 4.134 kg to 100.131 kg, in which the RMS value of the differences between the regression line and the calibrated values are 0.018 kg. Using this calibration result, the BMMD estimates the masse values of human subjects in the range of 33.16 kg to 95.79 kg with the standard uncertainty of 0.21 kg, which corresponds to 0.2% of the maximum value of the mass of the human subjects. It is found that the oscillation of BMMD seat is disturbed even with quiet breathing of the subject human. This is considered to be caused by the relative change of the center of mass of the human body due to the movement of internal organs.
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