The role of the sensor bridge circuit is measured generally weak, must use special circuitry to measure weak variations of this, the most common age of the bridge circuit is a circuit, the main DC and AC bridge circuit. Role of the bridge circuit is a resistor the resistance change rate ΔR / R is converted into a voltage output, and then supplied to the amplifier circuit is measured.

This is the role of the sensor bridge circuit, and I hope to help you.