Abstract: The radial dimension of selected teeth in toothed wheels used for measuring the transmitted shaft torque are changed in a predetermined spatial pattern corresponding to desired information. Such embedded data structures within the torque measurement apparatus may be used for encoding data uniquely related to the shaft twist modulus of a particular torque meter. In this manner, the toothed torque and/or reference wheels may be used to "self-compensate" or "program" appropriate electronic signal processing apparatus so as to automatically take the particular shaft twist modulus fully into account before producing output torque measurement data. At the same time, the use of such different radial tooth dimensions provides a differential amplitude modulation component in the sensor output signal which may be used to sense the relative gap dimensions (i.e.