Fig 4 - uploaded by Kuter Erdil
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A depiction of the proof of concept experiments carried out on the fabricated flexible force encoder system. Rolling motion with a cylindrical rod is preferred to provide a uniform distribution of the applied force over different bits.
Source publication
This paper proposes a novel disposable linear absolute encoder system and its peripheral electronic readout circuitry to be used for the localization of force in a continuum media such as a flexible robotic arm. The proposed structure relies on the design of graphite layers on a flexible surface that shows varying resistance based on the applied st...
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Context 1
... deformation. In the mean time, the changes in the resistances (i.e. ∆R/R) of the three bits were recorded by the DSP system as a time-series data with a sampling period of 180µs. In order to provide a complete picture, the flow of information during the experiments is illustrated in Fig. 3 while a depiction of the experimental setup is given in Fig. 4. ...
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Citations
This work demonstrates the design, implementation, and experimental results of a low-cost disposable flexible sensor system capable of both impact localization and measurement. The proposed flexible sensor structure utilizes a special series of Bristol paper as the main fabrication material, which is coated with electric paint graphite paste and silver paste. The implemented sensor system uses a planar absolute encoder-like sensing topology to locate the impact and has a low-cost and quick manufacturing process. The size of the structure is
mm with a thickness of approximately 340
. It has an electronic read-out consisting of three identical Wheatstone bridge circuits and instrumentation amplifiers for each bit. It can detect the external forces in the range of 0.6N to 12N with a spatial resolution of 2.4 cm and 0.55 cm in horizontal and vertical axes, respectively. The proposed sensor structure is tested in a series of experiments using a robotic setup consisted of a pantograph mechanism and a direct drive linear motor. The experiments illustrate the results with measurement sensitivity as small as 1N and proper fatigue resilience against repetitive loads.
In this work, a paper-based perforated disposable biosensing device is proposed as an alternative method for aflatoxin M1 molecule detection. The demonstrated system is designed to achieve a quick and novel biosensing operation with low-cost materials using competitive assay method. For that purpose, the main fabrication material has opted as a 190 μm thick filter paper. 50 μm thick piezoresistive graphite paste is coated onto both sides of the paper-based cantilever beam with the aim of acquiring more sensitive magnetic nanoparticle weight sensing capability. Additionally, the structure has arrays of closely spaced perforations to augmented effective Young’s modulus of the cantilever beam and further increase the system’s sensitivity. An electrocoil positioned 1mm below the sensor tip to apply an Hext and magnetically increase weight of the aflatoxin M1 with bovine serum albumin compound. An electronic read-out circuitry is implemented and integrated into the system. Average values of sensitivity and limit of detection (LoD) for each detection approach were calculated without blank subtraction and are shown with the standard error of the mean (SEM). LoD is calculated as 4.63 μg AFM1 which corresponds to 0.20127 V/V after subtracting standard deviation from the average value. It is experimentally demonstrated that the proposed system can detect a minimum of 14 μg of AFM1 molecules (0.14155 V/V). We magnetically amplified this tiny fragment of targeted molecules approximately 2731 times to 38.237 mg and made it detectable even with a disposable system. The sensitivity of the proposed system is 45.953 μV/mg. Finally, the maximum detectable AFM1 weight is reported as 71 μg.
