The reaction wheel (RW) is a key component in the attitude control system of spacecraft, but it is also a major source of disturbances. In this paper, we present a recently developed two types of disturbance detectors. One is the two-dimensional force and torque sensor with an air-table mechanism, the other is one-dimensional force sensor with an air-slide mechanism. Both of them are sensitive to low-frequency disturbances which are difficult to be detected with previous technique. In this paper, their measurement principle, measurement accuracy and measurement examples for RW induced disturbances are shown.

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