An Analog-Digital Mixed Measurement Method of Inductive Proximity Sensor

Guo, Yixin; Shao, Zili; Li, Ting

doi:10.3390/s16010030

Cited by 13 publications

(34 citation statements)

References 23 publications

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“…As alternatives to cameras, non-contact proximity sensors become critical components in pre-collision planners. Some of the state-of-art sensing principles of operation include infrared radiation (IR) [6], inductance [7], and capacitance [8]. Each technology has its advantages and disadvantages related to physical effect exploited for measurement.…”

Section: Introductionmentioning

confidence: 99%

Tri-Mode Capacitive Proximity Detection Towards Improved Safety in Industrial Robotics

2018

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This paper presents a multi-functional capacitive sensor that is developed to improve the worker safety during the industrial human-robot interactions. The sensor is to be mounted on the worker and used to maintain a safe distance between the workers and robots or automotive parts moved by the robots. The response of a capacitive proximity sensor is a function of the distance to an object as well as the dielectric/conductance and geometry properties of the object. This uncertainty can lead to a wrong distance estimation or possibly a missed detection. The presented approach alleviates this issue by implementing three sensing capabilities including distance measurement, motion tracking, and profile recognition in a single platform. The presented sensor employs a capacitive sensing element coupled to reprogrammable interface electronics. The sensing element features a matrix of electrodes that can be reconfigured to various arrangements at run-time by controlling the interface electronics to obtain a more detailed perception of the ambient environment. Quantitative regression models are built to seek out distances while an adaptive classification tool based on support vector machines is employed to recognize the surface profiles. The performance of the sensing modalities has been experimentally assessed. Experimental results are provided to demonstrate that the system is able to detect a metallic object at distances of up to 18cm with high resolutions, track its motion, and provide an estimate for its shape.

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Section: Introductionmentioning

confidence: 99%

Tri-Mode Capacitive Proximity Detection Towards Improved Safety in Industrial Robotics

2018

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“…For an aircraft, the required mechanical distance measurements are usually in the range of 2–6 mm, and the required measurements accuracy are in the range of 0.2–1.0 mm [ 7 , 10 , 12 , 13 ]. According to RTCA-DO-160F (a standard for the environmental testing of avionics hardware named environmental conditions and test procedures for airborne equipment), the required operating temperature ranges from −55–0

C and 55–70

C [ 10 , 12 , 13 , 14 ]. The sensors are located on the landing gear, doors, cargo loading systems, and thrust reverser actuation systems (TRAS) [ 10 , 11 , 13 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, these sensors use rapid variation in magnetic reluctance of cores as switching outputs, which seriously affects ambient electromagnetic environment [ 7 , 13 , 15 , 16 ]. In order to satisfy the emission of radio frequency energy testing of RTCA-DO-160F, any open magnetic circuit with large current excitation should be avoided in avionic applications [ 10 , 12 , 16 ]. Hence, IPS with small current excitation (usually less than 15 mA) is widely used in the field of aviation [ 12 , 13 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…In order to satisfy the emission of radio frequency energy testing of RTCA-DO-160F, any open magnetic circuit with large current excitation should be avoided in avionic applications [ 10 , 12 , 16 ]. Hence, IPS with small current excitation (usually less than 15 mA) is widely used in the field of aviation [ 12 , 13 , 15 , 16 ]. For example, the aircrafts Airbus (Blagnac, France) A380, A330, A320, Boeing (Seattle, WA, USA) B767, B747, and GE (Evendale, OH, USA) CF6-50 (TRAS) use special IPSs of Crane (Burbank, CA, USA) (80-008, 8-552, 72A04, 8-527, 8-527, 8-644) [ 10 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…For a single product, application effect difference between using micro-controller unit (MCU) and other simple circuit is not obvious. However, there is great stability difference for complicated electromechanical system containing dozens or hundreds of IPSs [ 12 , 15 , 16 ]. Hence, IPSs used in aviation usually avoid using process control components, such as MCUs and digital signal processors (DSPs).…”

Section: Introductionmentioning

confidence: 99%

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Dimension-Reduced Analog—Digital Mixed Measurement Method of Inductive Proximity Sensor

Guo

Shao

Tao

et al. 2017

Sensors

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Inductive proximity sensors (IPSs) present a unique no-contact advantage. They are widely preferred for displacement measurement in various industrial fields (e.g., aviation and aerospace), and they are improved continuously. When the inductance and resistance components of the IPS sensing core are separated, the influence of temperature drift on measurement can be eliminated. The complexity of online computation of component separation can be reduced using a two-dimensional look-up table method. However, this method exhibits disadvantages, such as large capacity of the look-up table, dependency on precision measurement of sensing core parameter, and nonlinear distribution of measurement resolution. This study aims to overcome these disadvantages by examining the nonlinear relationship between the response of the sensing core and the ambient temperature, and proposes a dimension-reduced measurement method. The proposed method extracts the characteristics of the response curves at two temperatures and calculates the characteristics of the response curves at any temperature using a linear approximation. The look-up table capacity is less than 0.37% of the two-dimensional look-up table capacity (condensed) under the same condition; dimension reduction enables the construction of a complete look-up table directly by calibration procedures and avoids precise measurement on sensing core parameters; the calibration procedures establish uniform mapping of the distribution of measurement resolution. The experiment shows that, when the measurement ranges are 0–6, 0–5, and 0–4 mm, the maximum measurement errors are 0.140, 0.065, and 0.040 mm, respectively, under temperature ranging from 20 ∘C to 110 ∘C. This study extends the measurement range from 0–5 mm to 0–7 mm and improves the measurement accuracy over 0.1 mm (50% at 5 mm) compared with the two-dimensional look-up table method. Therefore, the proposed method not only inherits the advantages of the original method but also achieves the above-mentioned expected capacity improvements effectively.

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A Novel Relaxation Oscillator Based Single-Element Type Inductance-to-Time Converter

Narayanan¹,

Vijaykumar²,

Sai³

et al. 2023

Lecture Notes in Electrical Engineering

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An Analog-Digital Mixed Measurement Method of Inductive Proximity Sensor

Cited by 13 publications

References 23 publications

Tri-Mode Capacitive Proximity Detection Towards Improved Safety in Industrial Robotics

Tri-Mode Capacitive Proximity Detection Towards Improved Safety in Industrial Robotics

Dimension-Reduced Analog—Digital Mixed Measurement Method of Inductive Proximity Sensor

A Novel Relaxation Oscillator Based Single-Element Type Inductance-to-Time Converter

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