METHOD OF ADJUSTING TENSORESISTOR SENSORS WITH BRIDGE MEASUREMENT CIRCUIT BASED ON MULTIPLICATIVE TEMPERATURE ERROR TAKING INTO ACCOUNT NONLINEARITY OF TEMPERATURE CHARACTERISTIC OF SENSOR OUTPUT SIGNAL Russian patent published in 2012 - IPC G01B7/16 

FIELD: physics.

SUBSTANCE: nominal value of temperature-dependent resistor R_α is determined for a given temperature coefficient of resistance (TCR) α_k and the nominal value its shunt temperature-independent resistor R_∂, based on the multiplicative temperature error compensation condition. Resistors R_α and R_∂ are connected in the output diagonal of the bridge circuit operating at load resistance R_n≤2 kilohms. To this end, the nominal value of the output resistance of the bridge circuit R_out and its TCR α_r ⁺ and α_r ^- for two temperature ranges, Δt⁺=t⁺-t₀ and Δt^-=t^--t₀, is determined, where t₀, t⁺, t^- denote the normal temperature and extreme points of the operating temperature range of the sensor, respectively. It is determined whether α⁺ _r, α⁺ _∂0 and Δα_∂0 lie in the region where there is full compensation for multiplicative temperature error. If the determined α⁺ _r, α⁺ _∂0 and Δα_∂0 lie in the said region, nominal values of the temperature-dependent resistor R_α and the temperature-independent resistor R_∂ are calculated. The calculated values of R_α and R_∂ are installed into the output diagonal of the bridge circuit operating a at low-resistance load of R_n≤2 kilohms.

EFFECT: high adjustment accuracy.

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