Open AccessNormalized parameters of a magnetoresistive sensor in bridge circuits
Author(s) -
А. Пенин,
А. С. Сидоренко
Publication year - 2021
Publication title -
moldavian journal of the physical sciences
Language(s) - English
Resource type - Journals
eISSN - 2537-6365
pISSN - 1810-648X
DOI - 10.53081/mjps.2021.20-1.08
Subject(s) - dimensionless quantity , voltage , nonlinear system , wheatstone bridge , bridge circuit , magnetoresistance , electrical engineering , electronic circuit , bridge (graph theory) , mathematical analysis , mathematics , magnetic field , physics , engineering , mechanics , resistor , medicine , quantum mechanics
Magnetoresistive sensors are considered as part of bridge circuits for measuring magnetic field strength and electric current value. Normalized or relative expressions are introduced to change the resistance of the sensor and the measured bridge voltage to increase the information content of the regime to provide the possibility of comparing the regimes of different sensors. To justify these expressions, a geometric interpretation of the bridge regimes, which leads to hyperbolic straight line geometry and a cross ratio of four points, is given. Upon a change in the sensor resistance, the bridge regime is quantified by the value of the cross ratio of four samples (three characteristic values and the current or real value) of voltage and resistance. The cross ratio, as a dimensionless value, is taken as a normalized expression for the bridge voltage and sensor resistance. Moreover, the cross ratio value is an invariant for voltage and resistance. The proposed approach considers linear and nonlinear dependences of measured voltage on sensor resistance from general positions.