STRAIN GAUGE FORCE SENSOR Russian patent published in 2023 - IPC G01L1/22 

FIELD: instrument engineering.

SUBSTANCE: invention can be used to create temperature sensors in a wide temperature range. The elastic element of the sensor is made in form of a parallelogram, on which a new topology of the strain gauge bridge with three additionally introduced adjustment resistors, interconnections and contact pins is fixed, all elements are made in a monolithic design from constantan foil on an insulating substrate. Adjustment resistors permit to adjust the following parameters: temperature drift of the “zero”, balancing of the “zero”, temperature changes in sensitivity and output signal magnitude. All adjustment resistors in the initial state are shunted by jumpers and located on the rigid part of one of the parallelogram beams. All temperature-dependent adjustment resistors are formed on the basis of constantan foil resistors, and to make the resistors temperature-dependent, their temperature resistance coefficient (TRC) was adjusted. For this purpose, each resistor intended for thermal compensation was shunted with a thin metal film with a large TRC, which was atomically fixed to the resistor, and thus the original TRC of the foil resistors was changed. All adjustments to the sensor parameters are made by cutting the shunt busbars at the required sections of adjustment resistors, while the bridge circuit must be connected to a constant voltage source, and when adjusting the value of the output signal, the sensor must be loaded with a rated force. When supply voltage is applied to the input diagonal and the sensor is loaded with the measured force, an output signal proportional to the measured force is generated on the output diagonal.

EFFECT: increase of accuracy of measurements over a wide temperature range, as well as to increase the reliability of the sensor.

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