Six-wire system separated Wheatstone bridge temperature measurement structure and method

Abstract

The invention discloses a six-wire system separated Wheatstone bridge temperature measurement structure and method. The structure comprises three copper thermal resistors R1, R2 and R3 and a platinumresistor Rt and is characterized in that a Wheatstone bridge is composed of a copper thermal resistor R1, a copper thermal resistor R2, a copper thermal resistor R3 and a platinum resistor Rt, whereinthe copper thermal resistor R1 and the platinum thermal resistor Rt form a side bridge arm, the copper thermal resistor R2 and the copper thermal resistor R3 form the other side bridge arm, six wiresare divided into three groups, A1 and A2 are power supply wires of the structure and are connected with two sides of the Wheatstone bridge, B1 and B2 are wires for measuring an actual power supply voltage of the structure and are further connected with the two sides of the Wheatstone bridge, C1 and C2 are wires for measuring voltage difference of a Wheatstone bridge arm, the C1 is connected witha circuit node Y, and the C2 is connected with a circuit node X. The temperature measurement structure is advantaged in that the temperature measurement structure is suitable for long-distance, high-resolution and high-accuracy temperature measurement application, and supports high-magnification measurement of a post-amplifier, and is capable of eliminating influence of wire resistance and temperature difference thermoelectric potential caused by long distance on the measurement result.

Description

Technical field: [0001] The invention relates to long-distance temperature measurement technology, high-resolution temperature measurement technology, high-accuracy temperature measurement technology, etc., and specifically refers to a six-wire separated Wheatstone bridge temperature measurement structure, which can be widely used in long-distance, high-resolution In the field of high-rate, high-accuracy temperature measurement. Background technique: [0002] Realizing long-distance, high-resolution, and high-accuracy temperature measurement is of great practical significance for scientific research and industrial control, and due to the influence of temperature difference thermoelectric potential and wire resistance, temperature measurement in applications such as tunnels, mines, deep seas, and space stations The result often has a large deviation, and the longer the distance between the temperature measuring element and the analog signal acquisition circuit board, the grea...

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to solve the problem of low temperature measurement accuracy and limited resolution at long distances. The six-wire separated Wheatstone bridge structure is used to eliminate the influence of wire resistance and temperature difference thermoelectric potential. The temperature measurement range and Flexible design of temperature resolution to achieve long-distance, high-resolution, high-accuracy temperature measurement

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