Measuring and testing – Dynamometers – Responsive to force
Patent
1983-03-21
1985-09-17
Rowland, James L.
Measuring and testing
Dynamometers
Responsive to force
73DIG2, G01L 112
Patent
active
045412898
ABSTRACT:
A magnetoelastic force transducer with temperature-compensated sensitivity is produced by equally exciting a measuring transducer and a reference transducer having cores of the same material and the same design and in good thermal contact. A spring loads the core of the reference transducer with a constant force. The output signal of the reference transducer is rectified in a phase-sensitive rectifier, the output signal of which is compared with a constant reference voltage. The difference signal resulting from this comparison controls the phase position of the control voltage of the rectifier in such a way that the output signal of the rectifier is brought into agreement with the reference voltage. The output signal of the measuring transducer is also rectified in a phase-sensitive rectifier, which is controlled by said control voltage and the output signal of which constitutes the temperature-compensated measured signal. The same phase-sensitive rectifier is preferably used for both signals by switching devices for the input and output connections of the rectifier.
REFERENCES:
patent: 2571718 (1951-10-01), Howes
patent: 3279247 (1966-10-01), Hiratsuka
patent: 3639832 (1972-02-01), Goebbels
patent: 4193294 (1980-03-01), Forslund et al.
ASEA Aktiebolag
Rowland James L.
Tumm Brian R.
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