Resistive sensor array read-out circuit based on two-wire system equipotential method

A technology of resistive sensor and readout circuit, which is applied in the field of sensors, can solve the problems of destroying the ideal isolation feedback condition of the readout circuit, the influence of the test accuracy of the resistive sensor array, and the large measurement error of the resistance value of the measured unit, etc., to achieve the expansion Effects of resistance range, interference elimination, and crosstalk error elimination

Active Publication Date: 2016-05-25
SOUTHEAST UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lead resistances with basically the same resistance and contact resistances with different resistances have a significant impact on the test accuracy of the resistive sensor array
As far as the shared row and column resistive sensor array based on the equipotential method is concerned, the lead resistance and contact resistance cause the potential difference between the drive terminal of the readout circuit and the drive terminal of the resistive sensor array module, and also cause the The potential difference between the sampling terminal of the resistive sensor array module, thus destroying the ideal isolation feedback condition of the readout circuit, and making the resistance measurement error of the unit under test larger
Therefore, basically the same lead resistance and different joint contact resistance have a significant impact on the test results of the shared row and column resistive sensor array based on the equipotential method. At the same time, the channel conduction resistance of the multi-way switch in the traditional method will affect the unit under test. How to eliminate the influence of these factors is a problem to be further studied

Method used

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  • Resistive sensor array read-out circuit based on two-wire system equipotential method
  • Resistive sensor array read-out circuit based on two-wire system equipotential method
  • Resistive sensor array read-out circuit based on two-wire system equipotential method

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Embodiment Construction

[0034] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0035] figure 2 It shows the principle of the equipotential method readout circuit of the existing shared row and column line resistive sensor array, and the current resistive sensor R in the figure is xy R in an M×N shared row and column resistive sensor array 11 , image 3 for figure 2 The equivalent diagram of the readout principle of the readout circuit. In this circuit, there is only one connection between each row or column line of the array and the test circuit. Under the ideal working condition of the circuit, the channel on-resistance R of all the two-to-one multi-way switches sc , the cumulative resistance R of the lead resistance of the drive connection line and the contact resistance of the connector Lc is ignored so that R xy The voltage of the column line V cy =V I , the voltage of other column lines is 0; at the same time, equa...

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Abstract

The invention discloses a resistive sensor array read-out circuit based on a two-wire system equipotential method, and belongs to the technical field of a sensor. The read-out circuit is applied to an M*N two-dimensional resistive sensor array sharing row wires and column wires and comprises an equivalent current driving operation amplifier, a column wire driving operation amplifier, a row multipath selector, a column multipath selector, a test current sampling resistor, a reference voltage source, and two connecting wires respectively arranged for each row wire and each column wire of the resistive sensor array. The invention further discloses a read-out method of the read-out circuit, and a sensing system. Compared to the prior art, a two-wire system equipotential method is taken as a key technology, measurement errors caused by connection with a cable lead wire resistor, a cable joint contact resistor and a multipath switch channel conduction resistor can be effectively eliminated, and the measurement precision of the resistive sensor array is substantially improved.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a resistive sensor array readout circuit. Background technique [0002] The array sensing device is to combine multiple sensing elements with the same performance according to the structure of a two-dimensional array. It can change or generate corresponding shapes and characteristics by detecting changes in parameters focused on the array. This feature is widely used in biosensing, temperature tactile and thermal imaging based on infrared sensors, etc. [0003] Resistive sensor arrays are widely used in infrared imaging simulation systems, force tactile sensing and temperature tactile sensing. Taking temperature touch as an example, since the temperature sensing device involves the transfer of heat and the perception of temperature, in order to obtain the thermal properties of the object, the device puts forward higher requirements for the temperature measurement accuracy and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/16
CPCG01D5/16
Inventor 吴剑锋何赏赏李建清
Owner SOUTHEAST UNIV
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