Simultaneous Measurement of Temperature and Refractive Index Using High Temperature Resistant Pure Quartz Grating Based on Femtosecond Laser and HF Etching

Zhao, Na; Lin, Qijing; Yao, Kun; Zhang, Fuzheng; Tian, Bian; Chen, Feng

doi:10.3390/ma14041028

Cited by 9 publications

(4 citation statements)

References 41 publications

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“…Thus, it is quite natural that the electrical and optical properties of these nodes are very different from the nearby areas. Indeed, this has been confirmed experimentally [37][38][39][40][41][42][43] (see also references therein). In particular, it has been shown that acupuncture points have higher electric conductivity, increased conductance and capacitance, reduced impedance, and elevated electrical potential compared to adjacent non-acupuncture points.…”

Section: Cyclotron Vs Acupuncturementioning

confidence: 56%

“…In particular, it has been shown that acupuncture points have higher electric conductivity, increased conductance and capacitance, reduced impedance, and elevated electrical potential compared to adjacent non-acupuncture points. For instance, the refractive index in the acupuncture points varies from 1.36 to 1.40: in the range 1.41 to 1.49 in epidermal tissues and 1.36 to 1.41 in dermal tissues over the wavelength range [42,44]. This can be compared with the refractive index 1.373 (1.380 and 1.401) of the human cornea and 1.386-1.406 of the human lens [45], which are significantly higher than the refractive index of 1.33 for bulk water.…”

Section: Cyclotron Vs Acupuncturementioning

confidence: 99%

See 1 more Smart Citation

Effects of Ion Cyclotron Frequencies on Human Resistance and Reactance in 31 Healthy Subjects

Liguori¹,

Brizhik

Liguori³

et al. 2022

Radiation

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In order to test the theory of Brizhik et al. about the dynamic allocation of acupuncture meridians on human body and their role as hydric paths for solitons, we tested the effect of both acupuncture and exposure to extremely low frequencies (ELF) tuned with suitable ion cyclotron frequencies. The similarity of the effects, inducing variations of body impedance measured in well-known acupuncture points, up to the interchangeability and the synergy of the two treatments, the mechanic and the electromagnetic ones, turns to be evidence of the validity of the theory. Resistance and reactance variations have been detected in a group of 31 healthy volunteers before and after stimulation with a standard sequence of cyclotron frequencies, emitted from an innovative electromagnetic therapy (EMT) device. These variations were then compared with the variations produced by the well-known percutaneous stimuli of mechanical and piezoelectric nature, and, in particular in this work, acupuncture. Our results show that the observed variations can be considered as significant in both groups: cyclotron and acupuncture. The greater variations brought about by the cyclotron treatment stand out clearly.

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Section: Cyclotron Vs Acupuncturementioning

confidence: 56%

Section: Cyclotron Vs Acupuncturementioning

confidence: 99%

Effects of Ion Cyclotron Frequencies on Human Resistance and Reactance in 31 Healthy Subjects

Liguori¹,

Brizhik

Liguori³

et al. 2022

Radiation

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show abstract

“…This is especially suitable for distributed measurement. In recent years, researchers have carried out extensive research on temperature measurement with FBG sensor arrays [ 17 , 18 , 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Temperature Field Measurement of Photovoltaic Module Based on Fiber Bragg Grating Sensor Array

Feng

Wang

et al. 2022

Materials

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Studying the temperature field of photovoltaic modules is important for improving their power generation efficiency. To solve the problem of traditional sensors being unsuitable for measuring the spatial temperature field, we designed a real-time detection scheme of the photovoltaic module temperature field based on a fiber Bragg grating (FBG) sensor array. In this scheme, wavelength division multiplexing and space division multiplexing technologies were applied. The multi-channel FBG sensor strings were arranged on the surface and in the near field of the photovoltaic module. Different FBG strings were selected through optical switches, and the wavelength of the FBG string was addressed and demodulated using the tunable laser method and a peak-seeking algorithm. A measurement experiment of the photovoltaic module temperature field was carried out in an outdoor environment. The experimental results showed that the fluctuation law of the photovoltaic module surface and near-field temperature is basically consistent with that of solar radiation power. The temperature of the photovoltaic module decayed from the surface to space. Within 6 mm of the photovoltaic module surface, the temperature sharply dropped, and then the downward trend became flat. The lower the solar radiation power and the higher the wind speed, the faster the temperature decay. This method provides technical support for measuring the temperature field of a photovoltaic module and other heat source equipment.

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“…The experimental results show that the pressure sensitivity of the sensor is 3.402 pm/kPa, in the range of 0-200 kPa, and the temperature response sensitivity is 19.29 pm/ • C at 20-55 • C; this structure is suitable for low pressure measurement. In the existing papers, the research mostly focuses on the low-pressure and low-temperature section; however, the single-parameter measurement of temperature can already reach a high temperature [45]. However, for the temperature measurement under high pressure, the current research generally stays at room temperature, and there is less measurement and monitoring in the high-temperature and high-pressure complex environments.…”

Section: Introductionmentioning

confidence: 99%

Research on the High Temperature and High Pressure Gold-Plated Fiber Grating Dual-Parameter Sensing Measurement System

et al. 2022

Self Cite

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In electrohydrostatic drive actuators, there is a demand for temperature and pressure monitoring in complex environments. Fiber Bragg grating (FBG) has become a promising sensor for measuring temperature and pressure. However, there is a cross-sensitivity between temperature and pressure. A gold-plated FBG is proposed and manufactured, and an FBG is used as a reference grating to form a parallel all-fiber sensing system, which can realize the simultaneous measurement of pressure and temperature. Based on the simulation software, the mechanical distribution of the pressure diaphragm is analyzed, and the fixation scheme of the sensor is determined. Using the demodulator to monitor the changes in the reflectance spectrum in real-time, the pressure and ambient temperature applied to the sensor are measured. The experimental results show that the temperature sensitivity of gold-plated FBG is 3 times that of quartz FBG, which can effectively distinguish the temperature changes. The pressure response sensitivity of gold-plated FBG is 0.3 nm/MPa, which is same as the quartz FBG. Through the sensitivity matrix equation, the temperature and pressure dual-parameter sensing measurement is realized. The accuracy of the temperature and pressure measurement is 97.7% and 99.0%, and the corresponding response rates are 2.7 ms/°C and 2 ms/MPa, respectively. The sensor has a simple structure and high sensitivity, and it is promising to be applied in health monitoring in complex environments with a high temperature and high pressure.

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Simultaneous Measurement of Temperature and Refractive Index Using High Temperature Resistant Pure Quartz Grating Based on Femtosecond Laser and HF Etching

Cited by 9 publications

References 41 publications

Effects of Ion Cyclotron Frequencies on Human Resistance and Reactance in 31 Healthy Subjects

Effects of Ion Cyclotron Frequencies on Human Resistance and Reactance in 31 Healthy Subjects

Temperature Field Measurement of Photovoltaic Module Based on Fiber Bragg Grating Sensor Array

Research on the High Temperature and High Pressure Gold-Plated Fiber Grating Dual-Parameter Sensing Measurement System

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