scholarly journals Design and Evaluation of a Fiber-Optic Grip Force Sensor with Compliant 3D-Printable Structure for (f)MRI Applications

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Tobias L. Bützer ◽  
Mike D. Rinderknecht ◽  
Gunda H. Johannes ◽  
Werner L. Popp ◽  
Rea Lehner ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Grip Force ◽  
Fiber Optic ◽  
Low Cost ◽  
Force Sensor ◽  
Linear Displacement ◽  
Fiber Optic Sensor ◽  
Force Transmission ◽  
Optic Sensor ◽  
Linear Behavior

Grip force sensors compatible with magnetic resonance imaging (MRI) are used in human motor control and decision-making research, providing objective and sensitive behavioral outcome measures. Commercial sensors are expensive, cover limited force ranges, rely on pneumatic force transmission that cannot detect fast force changes, or are electrically active, which increases the risk of electromagnetic interference. We present the design and evaluation of a low-cost, 3D-printed, inherently MRI-compatible grip force sensor based on a commercial intensity-based fiber-optic sensor. A compliant monobloc structure with flexible hinges transduces grip force to a linear displacement captured by the fiber-optic sensor. The structure can easily be adapted for different force ranges by changing the hinge thickness. A prototype designed for forces up to 800 N was manufactured and showed a highly linear behavior (nonlinearity of 2.37%) and an accuracy of 1.57% in a range between zero and 500 N. It can be printed and assembled within one day and for less than $300. Accurate performance was confirmed, both inside and outside a 3 T MRI scanner within a pilot study. Given its simple design allowing for customization of sensing properties and ergonomics for different applications and requirements, the proposed grip force handle offers researchers a valuable scientific tool.

scholarly journals Hybrid Fiber Optic Sensor, Based on the Fabry–Perot Interference, Assisted with Fluorescent Material for the Simultaneous Measurement of Temperature and Pressure

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1097 ◽  
Author(s):  
Xiaofeng Jiang ◽  
Chun Lin ◽  
Yuanqing Huang ◽  
Kan Luo ◽  
Jianhuan Zhang ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Fiber Optic ◽  
Low Cost ◽  
Fiber Optic Sensor ◽  
Temperature Sensitive ◽  
Length Variation ◽  
Excitation Light ◽  
Light Emitting ◽  
Reflected Light ◽  
Fabry Perot

Herein we design a fiber sensor able to simultaneously measure the temperature and the pressure under harsh conditions, such as strong electromagnetic interference and high pressure. It is built on the basis of the fiber-optic Fabry–Perot (F–P) interference and the temperature sensitive mechanism of fluorescent materials. Both halogen lamps and light-emitting diodes (LED) are employed as the excitation light source. The reflected light from the sensor contains the low coherent information of interference cavity and the fluorescent lifetime. This information is independent due to the separate optical path and the different demodulation device. It delivers the messages of pressure and temperature, respectively. It is demonstrated that the sensor achieved pressure measurement at the range of 120–400 KPa at room temperature with a sensitivity of 1.5 nm/KPa. Moreover, the linearity of pressure against the cavity length variation was over 99.9%. In the meantime, a temperature measurement in the range of 25–80 °C, with a sensitivity of 0.0048 ms/°C, was obtained. These experimental results evince that this kind of sensor has a simple configuration, low-cost, and easy fabrication. As such, it can be particularly applied to many fields.

Simultaneous Measurement of Torsion and Curvature Using Curvature Fiber Optic Sensor

2008 ◽  
Vol 392-394 ◽  
pp. 448-453
Author(s):  
Y.L. Fu ◽  
H.T. Di
Keyword(s):  
Torsion Angle ◽  
Fiber Optic ◽  
Low Cost ◽  
Fiber Optic Sensors ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Optimal Direction ◽  
Maximal Sensitivity ◽  
Negative Bending ◽  
Torsion Deformation

Curvature fiber optic sensors are a kind of novel low cost sensors that can detect curvature directly and distinguish the positive bending and negative bending. This kind of sensor is used to detect torsion deformation of shaft in this paper. The optimal direction of curvature fiber optic sensor was analyzed in osculating plane and rectification plane and maximal sensitivity was gained. The results show that sensor response to the torsion angle is linear approximately. Torsion angle, curvature and bending direction of shaft were measured simultaneously by using curvature fiber optic sensors.

Miniaturized Module Force Sensor Unit using a Fiber Optic Sensor

2018 ◽  
Vol 2018 (0) ◽  
pp. 1P1-J02
Author(s):  
Toshiki Nakatsuka ◽  
Tatsuya Nitta ◽  
Tomonori Kawabata ◽  
Tadao Matsunaga ◽  
Yoichi Haga ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Force Sensor ◽  
Fiber Optic Sensor ◽  
Sensor Unit ◽  
Optic Sensor

Low-Cost Spark Plug-Integrated Fiber Optic Sensor for Combustion Pressure Monitoring

1993 ◽  
Author(s):  
Gang He ◽  
Andy Patania ◽  
Mike Kluzner ◽  
Dan Vokovich ◽  
Victor Astrakhan ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Low Cost ◽  
Fiber Optic Sensor ◽  
Pressure Monitoring ◽  
Combustion Pressure ◽  
Optic Sensor ◽  
Spark Plug

scholarly journals Organic phosphor based fiber-optic sensor for detection of UV radiation

2021 ◽  
Vol 2086 (1) ◽  
pp. 012155
Author(s):  
A S Matrosova ◽  
V A Ananyev ◽  
G A Pchelkin ◽  
D N Shurupov ◽  
S K Evstropiev ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Fiber Optic ◽  
Low Cost ◽  
Optical Power ◽  
Signal Amplitude ◽  
Optical Signal ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Organic Phosphor ◽  
Fiber Output

Abstract The paper presents a simple and low-cost fiber-optic sensor for detection of UV radiation. A sensor construction consists of a silica capillary with a photoactive composition based on an organic phosphor, organic solvent and epoxyacrylate inside and a multimode optical fiber in contact with each other. By adjusting the proportion of components in a photoactive composition, it is possible to obtain a pronounced optical signal at wavelength near 440 nm which is the luminescence emission wavelength of the chosen organic phosphor. The potential of using the construction as a UV sensor is confirmed by the linear dependence of the optical signal amplitude at the fiber output on the optical power supplied to the fiber input.

Fiber optic sensor of linear displacement

1996 ◽  
Author(s):  
Michael I. Shribak ◽  
Victor L. Kolpashchikov ◽  
Oleg G. Martynenko
Keyword(s):  
Fiber Optic ◽  
Linear Displacement ◽  
Fiber Optic Sensor ◽  
Optic Sensor
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