THE ELECTRONIC SENSOR FOR DETAILS DEFORMATIONS MEASUREMENT IN THE WIDE INTERVAL OF TEMPERATURES

The analysis of domestic and foreign electronic sensors of high accuracy which are developed for mechani-cal details deformations measurement in different fields of technique is carried out. But they provide defor-mations measurements with high accuracy only in a narrow interval of temperatures (from +180C to +220C) as external perturbations. In this regard the scientific task of electronic sensor development which allows to measure with high accuracy deformations in a wide interval of temperatures (from -100C to +800C) is de-fined. Such sensor is developed on the basis of the deformation transformer in the frequency of square pulses for application in refrigeration technique. The transformer provides the continuous noncontact removing of deformation signal and represents the closed system of auto generator type executed on the integrated microcircuits basis. The operational amplifier with the negative "drift of zero" of constant voltage and flexible back coupling is set sequentially in direct channel of the sensor circuit for the purpose of support of its steady functioning. The auto generator operation mode of the sensor (deformation can be absent) is provided at the expense of a small initial imbalance of the tensometric bridge which is located at the beginning of the direct channel of the sensor circuit enveloped by tight back coupling. Removing of deformation signal is provided due to change of tensoresistor which is pasted on a deformable part of a detail value and is a part of the tensometric bridge. This analog signal amplifies and will be transformed to the frequency which in the form of the symmetric heteropolar square pulses arrives on an output of the sensor and through tight back coupling feeds the tensometric bridge.