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A magnetometer for measuring torques in the range 10-10Nm -5·10-4Nm (10-3dyncm -5·103dyncm) is described. Torque compensation is achieved by feedback from a photodetector into a PID regulator system which generates a current through a compensation coil located in the field of permanent magnets. Stability criteria for the regulator system are discussed. The apparatus permits continuous measurement of the torque as a function of angle with simultanuous registration of the data on x-y-recorder and on paper tape for computer analysis. Measurements can be made in the temperature range 4.2 K to 400 K.
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Westerstrandh et al. (1976) studied this question.
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