Circuit and method for improving sensitivity of differential resistance type sensor

Abstract

The invention discloses a circuit and a method for improving the sensitivity of a differential resistance type sensor. A differential resistor R1 is connected in series with a differential resistor R2, the change directions of the R1 and the R2 are opposite, a differential resistor R3 is connected in series with a differential resistor R4, the change directions of the R3 and the R4 are opposite, the R3 and the R4 are connected in parallel at the two ends of the R1 and the R2, and the change directions of the R3 and the R1 are opposite; and an output signal line a is led out from a center tap point A on a connecting line of the R1 and the R2, and an output signal line b is led out from a center tap point B on a connecting line of the R3 and the R4. A group of differential resistors which are opposite to the original differential resistors in change direction and are the same as the original differential resistors in resistance are additionally arranged, and the two groups of differential resistors form an induction part which is of a differential structure mechanically and is in series connection electrically, so that a bridge circuit which is in differential change is formed between two middle connection points of the two pairs of differential resistors, the differential resistance type sensor effectively changes signal independent output and amplifies original output signals, and the resolution of actual change signals of the differential resistance type sensor is improved.

Description

technical field [0001] The invention relates to a circuit for improving the sensitivity of a differential resistance sensor and a method for improving the sensitivity of the differential resistance sensor, belonging to the technical field of the differential resistance sensor. Background technique [0002] Differential resistive sensor is a kind of widely used important monitoring instrument in the field of dam safety monitoring. This kind of instrument has many advantages such as good long-term stability, strong regularity of observation results and high cost performance. It can be used to measure the stress, strain, crack and seepage pressure of concrete by measuring the resistance ratio of the internal differential resistance of the differential resistance sensor without being affected by temperature. By measuring the change in the resistance value itself, it is also possible to measure changes in the temperature of the environment in which the differential resistive sens...

AI Technical Summary

Problems solved by technology

Strain gauge sensors have high sensitivity, but are subject to drift due to factors such as structure, poor long-term stability, and are greatly affected by temperature.

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