Apparatus and method for measuring five-wire-system differential resistor type sensor
A differential resistance, five-wire technology, applied in instruments and other directions, can solve the problems of large temperature changes, harsh, external interference, etc., to eliminate errors, improve accuracy and reliability, and high measurement accuracy.
Active Publication Date: 2016-05-04
NANJING HEHAI NANZI HYDROPOWER AUTOMATION
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Problems solved by technology
use image 3 and Figure 4 The method shown requires the ADC to perform two conversions when measuring the resistance ratio and the resistance sum. If noise is introduced during the switching input process between the two conversions or the excitation is There are slight fluctuations in the source or reference source, which will make the results of the two conversions not based on the same reference source, thus affecting the accuracy and stability of the measurement. Poor quality and large temperature changes will affect the accuracy of the excitation source and reference source
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[0042] When measuring as Figure 7 In the circuit embodiment shown in the diagram, in order to achieve higher precision resistance ratio and resistance sum measurement, the ADS1222 is selected as the analog-to-digital converter. The analog-to-digital converter has the following characteristics:
[0043] 1. The resolution is 24 bits, of which 20 bits are valid data;
[0044] 2. Two differential input channels, the input voltage range is ±2V ref (where ±V ref is the reference voltage);
[0045] 3. The minimum allowable reference voltage is 0.5V, and the maximum reference voltage is the analog power supply voltage AVDD. In order to reduce the power consumption of the system, 3.3V is used to supply the analog power supply and the digital power supply of the analog-to-digital converter 1 .
[0046] Constant voltage source 2 selects 2.5V constant voltage source. When measuring the resistance ratio, control the analog switch S 1 The third core wire 53 of the sensor is connected...
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The invention relates to an apparatus for measuring a five-wire-system differential resistor type sensor. The apparatus is composed of an analog-to-digital converter, a constant voltage source, a reference resistor and an analog switch. The analog-to-digital converter is connected with the constant voltage resource and the analog switch; the constant voltage source is connected with a five-wire-system differential resistor type sensor; and the analog switch is connected with the five-wire-system differential resistor type sensor and the reference resistor. In addition, the invention also provides a method for measuring a five-wire-system differential resistor type sensor. The apparatus for measuring a five-wire-system differential resistor type sensor is used for measuring a resistance ratio and a resistance sum of the five-wire-system differential resistor type sensor. According to the invention, an error caused by two-times measurement in the existing measurement method can be eliminated; and thus the measurement precision of the resistance ratio is only concerned with the precision of the analog-to-digital converter and the precision of the resistance sum is only associated with the precision of the analog-to-digital converter and the reference resistor. Therefore, accuracy and reliability of measurement by using the five-wire-system differential resistor type sensor are improved.
Description
technical field [0001] The invention relates to the field of sensor testing, in particular to a device and method for measuring a five-wire differential resistance sensor. Background technique [0002] In the field of safety monitoring technology, five-wire differential resistive sensors are usually used to monitor physical quantities such as stress and strain, temperature, joint opening, leakage and deformation of the project, and to analyze and judge the health and safety status of the project. [0003] The five-wire differential resistive sensor is composed of two steel wires of the same material (the resistivity ρ) and the same cross-sectional area (s), and the initial length of the two steel wires (l) is equal. The initial resistance of the two wires is When sensing the external force F, one of the steel wires will produce a tensile deformation of Δl, while the other steel wire will produce a compressive deformation of Δl, within the elastic range where k is a known...
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IPC IPC(8): G01D18/00
Inventor 何国云倪维东庞敏邵灿辉刘锋
Owner NANJING HEHAI NANZI HYDROPOWER AUTOMATION