Passive Proximity Detection Based on a Miniaturized Pyramidal Optical Sensor

Rai, Ashish; Zhuo, Dong Hao; Bahreyni, Behraad

doi:10.1109/sensors43011.2019.8956834

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…For the detection of passive proximity, a pyramidal optical sensor (miniaturized) was described in Ref. [ 4 ]. The base of the sensor was a pyramid with light sensors on the top and the sides.…”

Section: Introductionmentioning

confidence: 99%

Orange Dye and Silicone Glue Composite Gel-Based Optimized Impedimetric and Capacitive Surface-Type Proximity Sensors

Karimov,

Chani,

Fatima

et al. 2023

Gels

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Optimized surface-type impedimetric and capacitive proximity sensors have been fabricated on paper substrates by using rubbing-in technology. The orange dye (OD) and silicone glue (SG) composite-gel films were deposited on the zig-zag gap between two aluminum electrodes fixed on a paper (dielectric) substrate. The effect of proximity of various objects (receivers) on the impedance and the capacitance of the sensors was investigated. These objects were semi-cylindrical aluminum (metallic) foil, a cylindrical plastic tube filled with water, a kopeck-shaped plastic tube filled with carbon nanotubes and a human finger. The mechanism of sensing was based on the change in impedance and/or the capacitance of the sensors with variation of proximity between the surfaces of the sensor and the object. On decreasing proximity, the impedance of the sensors increased while the capacitance decreased. The impedimetric proximity sensitivities of CNT, water, metal-based receivers and the finger were up to 60 × 103 Ω/mm, 35 × 103 Ω/mm, 44 × 103 Ω/mm and 6.2 × 103 Ω/mm, respectively, while their capacitive sensitivities were −19.0 × 10−2 pF/mm, −16.0 × 10−2 pF/mm, −16.4 × 10−2 pF/mm and −1.8 × 10−2 pF/mm. If needed for practical application, the sensors can be built in to the Wheatstone bridge, which can also increase the sensitivity of the measurement. Moreover, the sensor’s materials are low cost, while the fabrication technique is easy and ecologically friendly. The sensor can also be used for demonstrative purposes in school and college laboratories.

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Section: Introductionmentioning

confidence: 99%

Orange Dye and Silicone Glue Composite Gel-Based Optimized Impedimetric and Capacitive Surface-Type Proximity Sensors

Karimov,

Chani,

Fatima

et al. 2023

Gels

View full text Add to dashboard Cite

show abstract

“…Proximity sensors have been employed across numerous existing and emerging fields such as robotic technologies, bio-electronic devices, parking sensors and human-machine interfaces [1], with an emphasis on a broad usage within industries like transportation, manufacturing as well as building automation and Industrial Internet of Things (IIoT) [2]. Since it is expected that the utilization of proximity sensors will increase even more, their power consumption has become a crucial attribute of such devices calling for more in-depth research and development of more energy-efficient sensors [3]. What is more, cost-effective and reliable proximity sensors that are satisfactory accurate are especially important for use case scenarios such as angle measurements used in robots that include wheel positioning and joint angle measurement [4], for collision avoidance, precision assembly as well as grasping [5].…”

Section: Introductionmentioning

confidence: 99%

TheraProx: Capacitive Proximity Sensing

et al. 2022

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This paper presents the development of a novel contactless omnidirectional capacitive proximity sensor. The presented device has been designed to be energy-efficient (≈5 mW power consumption) by means of duty-cycling the power supply. A comprehensive methodological experiment has been carried out to extensively evaluate the performance within the sensing range (5–10 cm). A simple boot-up self-adjustment mechanism has been implemented using a digital potentiometer. This feature allows for an effortless utilization of the proposed device in a wide variety of potential applications, including mobile robotics and human–machine interaction.

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Passive Proximity Detection Based on a Miniaturized Pyramidal Optical Sensor

Cited by 2 publications

References 14 publications

Orange Dye and Silicone Glue Composite Gel-Based Optimized Impedimetric and Capacitive Surface-Type Proximity Sensors

Orange Dye and Silicone Glue Composite Gel-Based Optimized Impedimetric and Capacitive Surface-Type Proximity Sensors

TheraProx: Capacitive Proximity Sensing

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