Actively stabilized optical feedback scheme for very stable, high sensitivity shear-force measurement

2003 ◽  
Vol 74 (8) ◽  
pp. 3664-3669
Author(s):  
Heeseong Jeong ◽  
Noh-Min Kwak ◽  
Hyeongjun Huh ◽  
Kyuman Cho
Keyword(s):  
Shear Force ◽  
Optical Feedback ◽  
Force Measurement ◽  
High Sensitivity ◽  
Feedback Scheme

scholarly journals Evaluation of thin, flexible sensors for time-resolved grip force measurement

2007 ◽  
Vol 221 (12) ◽  
pp. 1687-1699 ◽  
Author(s):  
E R Komi ◽  
J R Roberts ◽  
S J Rothberg
Keyword(s):  
Shear Force ◽  
Grip Force ◽  
Force Measurement ◽  
Real Life ◽  
Force Sensor ◽  
Ease Of Use ◽  
Time Resolved ◽  
Flexible Sensors ◽  
Sensor Performance ◽  
Dynamic Accuracy

Three types of thin, flexible force sensor were studied under a variety of loading conditions to determine their suitability for measuring grip force. Static accuracy, hysteresis, repeatability, and drift errors were established, the effects of shear force and surface curvature were considered, and dynamic accuracy and drift were measured. Novel tests were developed to consider dynamic accuracy and sensitivity to shear loadings. Additionally, three sensors were evaluated in a real-life gripping scenario, measuring grip force during a golf shot. Comments are made on sensor performance, ease of use, and durability.

A Flexible Tactile Sensor Based on Porous Graphene Sponge for Tiny Force Measurement

2018 ◽  
Author(s):  
Lingfeng Zhu ◽  
Yancheng Wang ◽  
Xin Wu ◽  
Deqing Mei
Keyword(s):  
Force Measurement ◽  
High Sensitivity ◽  
Tactile Sensor ◽  
Tactile Sensors ◽  
Force Detection ◽  
Pressure Sensing ◽  
Porous Graphene ◽  
Graphene Sponge ◽  
Healthcare Monitoring ◽  
Working Principle

Flexible tactile sensors have been utilized for epidermal pressure sensing, motion detecting, and healthcare monitoring in robotic and biomedical applications. This paper develops a novel piezoresistive flexible tactile sensor based on porous graphene sponges. The structural design, working principle, and fabrication method of the tactile sensor are presented. The developed tactile sensor has 3 × 3 sensing units and has a spatial resolution of 3.5 mm. Then, experimental setup and characterization of this tactile sensor are conducted. Results indicated that the developed flexible tactile sensor has good linearity and features two sensitivities of 2.08 V/N and 0.68 V/N. The high sensitivity can be used for tiny force detection. Human body wearing experiments demonstrated that this sensor can be used for distributed force sensing when the hand stretches and clenches. Thus the developed tactile sensor may have great potential in the applications of intelligent robotics and healthcare monitoring.

Chaos of interband cascade lasers in the mid-infrared regime

2020 ◽  
Author(s):  
Yu Deng ◽  
Zhuo-Fei Fan ◽  
Shiyuan Zhao ◽  
Frédéric Grillot ◽  
Cheng Wang
Keyword(s):  
Semiconductor Lasers ◽  
Near Infrared ◽  
Optical Feedback ◽  
Nonlinear Dynamical Systems ◽  
Initial Conditions ◽  
Electrical Power ◽  
High Sensitivity ◽  
Light Sources ◽  
Mid Infrared ◽  
Operation Conditions

Abstract Chaos in nonlinear dynamical systems is featured with irregular appearance and with high sensitivity to initial conditions. Near-infrared semiconductor lasers subject to optical feedback from an external reflector are popular chaotic light sources, which have enabled multiple applications. Here, we report the fully-developed chaos in a mid-infrared interband cascade laser with external optical feedback. The chaos leads to significant electrical power enhancement over a frequency span of 500 MHz. In addition, the laser also exhibits periodic oscillations or low-frequency fluctuations before producing chaos, depending on the operation conditions. This work paves the way for extending chaos investigations from the near-infrared regime to the mid-infrared regime, which can stimulate potential applications in this spectral range.

HIGH SENSITIVITY TRANSDUCERS FOR FORCE MEASUREMENT OF MYOFIBRILS

2007 ◽  
Vol 40 ◽  
pp. S692 ◽  
Author(s):  
Kien Nguyen Phan ◽  
Takakazu Kobayashi
Keyword(s):  
Force Measurement ◽  
High Sensitivity

A comparison of technical replicate (cuts) effect on lamb Warner–Bratzler shear force measurement precision

Meat Science ◽  
2015 ◽  
Vol 105 ◽  
pp. 93-95 ◽  
Author(s):  
B.W.B. Holman ◽  
T.I.R.C. Alvarenga ◽  
R.J. van de Ven ◽  
D.L. Hopkins
Keyword(s):  
Shear Force ◽  
Force Measurement ◽  
Measurement Precision

scholarly journals Mid-infrared hyperchaos of interband cascade lasers

2022 ◽  
Vol 11 (1) ◽  
Author(s):  
Yu Deng ◽  
Zhuo-Fei Fan ◽  
Bin-Bin Zhao ◽  
Xing-Guang Wang ◽  
Shiyuan Zhao ◽  
...  
Keyword(s):  
Semiconductor Lasers ◽  
Near Infrared ◽  
Optical Feedback ◽  
Nonlinear Dynamical Systems ◽  
Initial Conditions ◽  
High Sensitivity ◽  
Infrared Light ◽  
Mid Infrared ◽  
Interband Cascade Lasers ◽  
Cascade Lasers

AbstractChaos in nonlinear dynamical systems is featured with irregular appearance and with high sensitivity to initial conditions. Near-infrared light chaos based on semiconductor lasers has been extensively studied and has enabled various applications. Here, we report a fully-developed hyperchaos in the mid-infrared regime, which is produced from interband cascade lasers subject to the external optical feedback. Lyapunov spectrum analysis demonstrates that the chaos exhibits three positive Lyapunov exponents. Particularly, the chaotic signal covers a broad frequency range up to the GHz level, which is two to three orders of magnitude broader than existed mid-infrared chaos solutions. The interband cascade lasers produce either periodic oscillations or low-frequency fluctuations before bifurcating to hyperchaos. This hyperchaos source is valuable for developing long-reach secure optical communication links and remote chaotic Lidar systems, taking advantage of the high-transmission windows of the atmosphere in the mid-infrared regime.

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