Nonlinear compensating circuit of resistance bridge type sensor

Abstract

The invention belongs to the technical field of sensors, and discloses a nonlinear compensating circuit of a resistance bridge type sensor. The nonlinear compensating circuit comprises the resistance bridge type sensor, an excitation voltage source and a signal amplification circuit; a common mode resistor is connected between the resistance bridge type sensor and the negative end of a bridge power supply source in series; the output end of the signal amplification circuit is connected with the common mode resistor in series through a feedback resistor. The nonlinear compensating circuit has the advantages that signals (voltage) obtained after outside information sensed by the resistance bridge type sensor is converted are / is amplified through the signal amplification circuit, after pressure parting is carried out on the resistance bridge type sensor and the common mode resistor with the appropriate proportion (by changing the feedback resistor), and nonlinear compensating for the resistance bridge output type sensor with the gradually-increased output signal sensitivity is accordingly achieved. In addition, the signal amplification circuit in a circuit can be a digital programmable amplifier, the digital debugging zero position and the full scale can be applied, and the problems of low accuracy and poor stability caused by resistor replacement in the debugging process are solved. The measurement accuracy and the stability of the sensor are improved.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a non-linear compensation circuit of a resistance bridge type sensor. Background technique [0002] Sensors are widely used measuring instruments in various fields such as industrial process, meteorology, environmental protection, national defense engineering and even daily life. Due to the limitation of materials and process technology, most sensors, especially those with resistance bridge output type, when the input signal is linear When changing, the output voltage of the sensor does not change linearly, which will bring an error of more than 1%, making the measurement accuracy of the sensor very low. [0003] There are two ways to deal with the resistance bridge sensor with nonlinear output characteristics: one is to directly amplify the output signal of the sensor to the subsequent detection system without nonlinear compensation. This is generally the case where...

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Problems solved by technology

This also brings about the increase of material cost, consumes more manpower and time, greatly increases the production cost of the sensor, and cannot be supplied in batches in time

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