A simple and high-resolution POF displacement sensor based on face-coupling method

Ghaffar, Abdul; Li, Qi; Haider, Shah Ali; An, Sun; Leal‐Junior, Arnaldo; Xu, Lei; Chhattal, Muhammad; Mehdi, Mujahid

doi:10.1016/j.measurement.2021.110285

Cited by 11 publications

(2 citation statements)

References 40 publications

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“…Therefore, the dependence of the 1σ noises on sensitivity is shown in Figure 10b, which depicts that the larger the sensitivity, the smaller the 1σ noise. This feature of the time domain sensor is consistent with that of a variety of sensors, such as a magnetometer for high-resolution magnetic resonance spectroscopy [35], biosensors [36], electrochemical sensors [37], and displacement sensors [38]. In other words, sensor noise can be lowered by improving the sensor sensitivity.…”

Section: Measurement and Analysis Of Tunable Sensor Performance Based...supporting

confidence: 74%

Characterization of Sensitivity of Time Domain MEMS Accelerometer

Li,

Jian,

Yang

et al. 2024

Micromachines

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This paper characterizes the sensitivity of a time domain MEMS accelerometer. The sensitivity is defined by the increment in the measured time interval per gravitational acceleration. Two sensitivities exist, and they can be enhanced by decreasing the amplitude and frequency. The sensitivity with minor nonlinearity is chosen to evaluate the time domain sensor. The experimental results of the developed accelerometer demonstrate that the sensitivities span from −68.91 μs/g to −124.96 μs/g and the 1σ noises span from 8.59 mg to 6.2 mg (amplitude of 626 nm: −68.91 μs/g and 10.21 mg; amplitude of 455 nm: −94.51 μs/g and 7.76 mg; amplitude of 342 nm: −124.96 μs/g and 6.23 mg), which indicates the bigger the amplitude, the smaller the sensitivity and the bigger the 1σ noise. The adjustable sensitivity provides a theoretical foundation for range self-adaption, and all the results can be extended to other time domain inertial sensors, e.g., a gyroscope or an inclinometer.

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Section: Measurement and Analysis Of Tunable Sensor Performance Based...supporting

confidence: 74%

Characterization of Sensitivity of Time Domain MEMS Accelerometer

Li,

Jian,

Yang

et al. 2024

Micromachines

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“…The length of uncoated fiber was 1 m, and the twisting length was 10 cm. After twisting, a black tube was used to coat the fiber to shield the external light [ 46 ]. The light source was a LED with a wavelength of 660 nm, and the initial power was 10 mW.…”

Section: Methodsmentioning

confidence: 99%

Dynamic Rotational Sensor Using Polymer Optical Fiber for Robot Movement Assessment Based on Intensity Variation

Shi

Ghaffar

et al. 2022

Polymers

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A complex signal processing technique is usually required to process the data in most sensor design structures, and integration into real applications is also challenging. This work presents a dynamic rotational sensor using polymethyl methacrylate (PMMA) fiber for robot movement assessment. The sensor design structure is based on the coupling of light intensity, in which two PMMA fibers are twisted together. Both fibers are bent after twisting and attached on the linear translation stage, which is further attached to the robot. The variation in bending radius causes the bending loss, and that loss is coupled in the second fiber. The change in the macro-bend radius corresponds to the rotation of the robot. Experimental results indicate that the sensor can operate in full rotational cycle (i.e., 0°–360°) as well as for clock and anti-clockwise rotation. Moreover, different rotational speeds (2°/s, 3°/s, 5°/s, and 10°/s) were carried out. The hysteresis loss of the sensor was about 0.77% and the sensitivity was 8.69 nW/°. The presented dynamic rotational sensor is cost-effective and easily integrated into the robot structure to analyze the robot’s circular motion.

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