Method to Solve Hysteresis Error and High-frequency Noise Error of Capacitive Tactile Sensor

A tactile sensor, high-frequency noise technology, applied in the field of sensors, can solve the problem of inability to eliminate hysteresis error, and achieve the effect of reducing high-frequency noise error, improving measurement accuracy, and ensuring accuracy

Active Publication Date: 2021-07-20
SOUTHEAST UNIV
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Problems solved by technology

Existing methods generally use hardware circuits to filter high-frequency noise, and use the least square method to linearly fit the measurement data to obtain a fitted straight line as the input-output relational expression of the capacitive touch sensor, which cannot eliminate the influence of hysteresis error

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  • Method to Solve Hysteresis Error and High-frequency Noise Error of Capacitive Tactile Sensor
  • Method to Solve Hysteresis Error and High-frequency Noise Error of Capacitive Tactile Sensor

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[0056] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0057]In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "left side", "right side", "upper", "lower" are based on the orientations or positional relationships shown in the accompanying drawings, and are only For the purpose of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, "first", "second" and the like do not represent components importance, and therefore should not be construed as limiting the invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present inv...

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Abstract

A method for solving the hysteresis error and high-frequency noise error of a capacitive tactile sensor, step 1, calibration: specifically including positive stroke calibration, forming n positive stroke curves; reverse stroke calibration: forming n reverse stroke curves; step 2, calculating Mean value: specifically includes calculating the mean value of the forward stroke to form an average positive stroke curve; calculating the average value of the reverse stroke to form an average reverse stroke curve; comprehensively calculating the average value to form a comprehensive stroke curve; Step 3, fitting modeling: obtaining the forward stroke fitting function, Inverse travel fitting function and comprehensive fitting function; step 4, measurement; step 5, noise filtering; step 6, travel direction discrimination; step 7, solution: according to the travel direction discrimination result, use the corresponding fitting function to solve force at the current moment. The invention calibrates and calculates the loading and unloading processes respectively, thereby effectively reducing the influence of the hysteresis error while eliminating the high-frequency noise error, and improving the measurement accuracy of the capacitive touch sensor.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a method for solving hysteresis errors and high-frequency noise errors of capacitive touch sensors. Background technique [0002] A tactile sensor is a device or device that converts tactile signals into electrical signals, and has important application value in the fields of robots, wearable electronic devices, and medical testing. [0003] Common tactile sensors are mainly divided into piezoresistive, capacitive, inductive, piezoelectric, and photoelectric in principle. Among them, the capacitive tactile sensor has been widely researched and applied because of its simple structure, easy lightweight and miniaturization, and no influence of temperature. [0004] However, due to the plastic deformation of the elastic material used as the capacitive dielectric layer, the hysteresis error becomes the main factor affecting the accuracy of the capacitive tactile sensor, and the resulting measu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/041G06F3/044G01L1/14G01L9/12
CPCG06F3/0418G06F3/044G01L1/142G01L9/12G01L25/00
Inventor 宋爱国杨述焱徐宝国李会军曾洪朱利丰
Owner SOUTHEAST UNIV
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