A Sapphire Based Fiber Optic Dynamic Pressure Sensor for Harsh Environments: Fabrication and Characterization

2011 ◽  
Author(s):  
Benjamin Griffin ◽  
David Mills ◽  
Tony Schmitz ◽  
Mark Sheplak
Keyword(s):  
Pressure Sensor ◽  
Fiber Optic ◽  
Dynamic Pressure ◽  
Harsh Environments ◽  
Fabrication And Characterization

scholarly journals Temperature insensitive fiber optic pressure sensor with a pi-phase FBG on microstructured fiber

2021 ◽  
Author(s):  
Mohammad Hossein Mahlooji
Keyword(s):  
Wavelength Division Multiplexing ◽  
Pressure Sensor ◽  
Pressure Measurement ◽  
Fiber Optic ◽  
Dynamic Pressure ◽  
Pressure Change ◽  
Microstructured Fiber ◽  
Wavelength Division ◽  
Principal Axes ◽  
Low Sensitivity

Fiber optic sensing technology has become a competitive device for strain measurement in many applications such as structural health monitoring and machine condition monitoring. Such success is achieved due to its advantages such as lightweight, electrically non-conductive, electromagnetic field and harsh environment immune, relatively high sensitive to strain change and the compatibility with wavelength division multiplexing method to measure many points from just one fiber cable. However, the use of fiber optic sensors in pressure measurement in gas and fluid media encounters some challenges such as temperature cross-talk to the pressure measurement, low sensitivity, and slow response in gas medium. In this work, I demonstrate both analytically and by experiments that an fiber Bragg grating (FBG) pressure sensor, inscribed in a microstructured fiber with two side holes in its cladding, can be used to measure pressure and temperature simultaneously to remove the temperature effect on measurements. The sensor has a 𝝅-phase shifted FBG which intrinsically has a much narrower linewidth than that of the conventional FBGs and can significantly improve the sensitivity of the pressure measurement. The microstructured fiber has two different refractive indices along their two principal axes caused by its birefringence. Two FBG peaks in the measured spectra related to two principal axes change with different rates when the pressure and/or temperature is applied which makes it possible to measure the change of pressure and temperature. My results also show that the sensor responds to the pressure change instantaneously if the separation of two FBG polarization peaks is used as the measurand, which makes it suitable for dynamic pressure measurements. In addition, the sensor uses the FBG only with no transducer required and its size is extremely small, only one to two centimeter long and with a diameter of about 0.3 millimetre.

scholarly journals Temperature insensitive fiber optic pressure sensor with a pi-phase FBG on microstructured fiber

2021 ◽  
Author(s):  
Mohammad Hossein Mahlooji
Keyword(s):  
Wavelength Division Multiplexing ◽  
Pressure Sensor ◽  
Pressure Measurement ◽  
Fiber Optic ◽  
Dynamic Pressure ◽  
Pressure Change ◽  
Microstructured Fiber ◽  
Wavelength Division ◽  
Principal Axes ◽  
Low Sensitivity

Fiber optic sensing technology has become a competitive device for strain measurement in many applications such as structural health monitoring and machine condition monitoring. Such success is achieved due to its advantages such as lightweight, electrically non-conductive, electromagnetic field and harsh environment immune, relatively high sensitive to strain change and the compatibility with wavelength division multiplexing method to measure many points from just one fiber cable. However, the use of fiber optic sensors in pressure measurement in gas and fluid media encounters some challenges such as temperature cross-talk to the pressure measurement, low sensitivity, and slow response in gas medium. In this work, I demonstrate both analytically and by experiments that an fiber Bragg grating (FBG) pressure sensor, inscribed in a microstructured fiber with two side holes in its cladding, can be used to measure pressure and temperature simultaneously to remove the temperature effect on measurements. The sensor has a 𝝅-phase shifted FBG which intrinsically has a much narrower linewidth than that of the conventional FBGs and can significantly improve the sensitivity of the pressure measurement. The microstructured fiber has two different refractive indices along their two principal axes caused by its birefringence. Two FBG peaks in the measured spectra related to two principal axes change with different rates when the pressure and/or temperature is applied which makes it possible to measure the change of pressure and temperature. My results also show that the sensor responds to the pressure change instantaneously if the separation of two FBG polarization peaks is used as the measurand, which makes it suitable for dynamic pressure measurements. In addition, the sensor uses the FBG only with no transducer required and its size is extremely small, only one to two centimeter long and with a diameter of about 0.3 millimetre.

Fabrication and characterization of a sapphire based fiber optic microphone for harsh environments.

2010 ◽  
Vol 128 (4) ◽  
pp. 2444-2444 ◽  
Author(s):  
Benjamin A. Griffin ◽  
David A. Mills ◽  
Tony Schmitz ◽  
Mark Sheplak
Keyword(s):  
Fiber Optic ◽  
Harsh Environments ◽  
Fabrication And Characterization

Miniature fiber-optic pressure sensor

2005 ◽  
Vol 17 (2) ◽  
pp. 447-449 ◽  
Author(s):  
Yizheng Zhu ◽  
Anbo Wang
Keyword(s):  
Pressure Sensor ◽  
Fiber Optic

scholarly journals A Ceramic Diffusion Bonding Method for Passive LC High-Temperature Pressure Sensor

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2676
Author(s):  
Chen Li ◽  
Boshan Sun ◽  
Yanan Xue ◽  
Jijun Xiong
Keyword(s):  
High Temperature ◽  
Pressure Sensor ◽  
Pressure Sensors ◽  
Alumina Ceramic ◽  
Harsh Environments ◽  
Ceramic Substrates ◽  
Integrated Technology ◽  
All Ceramic ◽  
Test Platform ◽  
Bonding Method

Alumina ceramic is a highly promising material for fabricating high-temperature pressure sensors. In this paper, a direct bonding method for fabricating a sensitive cavity with alumina ceramic is presented. Alumina ceramic substrates were bonded together to form a sensitive cavity for high-temperature pressure environments. The device can sense pressure parameters at high temperatures. To verify the sensitivity performance of the fabrication method in high-temperature environments, an inductor and capacitor were integrated on the ceramic substrate with the fabricated sensitive cavity to form a wireless passive LC pressure sensor with thick-film integrated technology. Finally, the fabricated sensor was tested using a system test platform. The experimental results show that the sensor can realize pressure measurements above 900 °C, confirming that the fabricated sensitive cavity has excellent sealing properties. Therefore, the direct bonding method can potentially be used for developing all-ceramic high-temperature pressure sensors for application in harsh environments.

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