scholarly journals High-Pressure Sensors Based on Laser-Manufactured Sintered Silicon Carbide

2020 ◽  
Vol 10 (20) ◽  
pp. 7095
Author(s):  
Stefano Salvatori ◽  
Gennaro Salvatore Ponticelli ◽  
Sara Pettinato ◽  
Silvio Genna ◽  
Stefano Guarino
Keyword(s):  
Silicon Carbide ◽  
Electromagnetic Interference ◽  
Pressure Sensors ◽  
High Hardness ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Optoelectronic System ◽  
Cavity Depth ◽  
Sensor Structure ◽  
Sintered Silicon

In this work Sintered Silicon Carbide (S-SiC) samples have been used to fabricate fiber-optic-coupled pressure sensors. The sensor structure reproduces a low-finesse Fabry–Perot (FP) interferometer. Laser manufacturing of cylindrical S-SiC samples was performed to define the thin membrane geometry of sensors. FP cavity is defined by the end-face of a single mode fiber and the S-SiC diaphragm surface. Hence, pressure is evaluated by measuring the cavity depth by a dedicated optoelectronic system coupled to the single mode fiber. Exploiting the excellent properties of S-SiC, in terms of high hardness, low thermal expansion, and high thermal conductivity, realized devices have been characterized up to 20 MPa. Experimental results demonstrate that produced sensors exhibit a non-linearity around ±0.6%F.S. and a high input dynamics. The all-optic sensing system proposed in this work would represent a good alternative to conventional solutions based on piezoelectric effects, overcoming the drawback related to electromagnetic interference on the acquired signals. In addition, the mechanical characteristics of S-SiC allow the use of the sensor in both automotive and aerospace hostile environments as pressure monitors in combustion engines.

scholarly journals Thin Diamond Film on Silicon Substrates for Pressure Sensor Fabrication

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3697
Author(s):  
Stefano Salvatori ◽  
Sara Pettinato ◽  
Armando Piccardi ◽  
Vadim Sedov ◽  
Alexey Voronin ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Electromagnetic Interference ◽  
Chemical Vapor ◽  
High Hardness ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Silicon Substrates ◽  
Sensing Element ◽  
Optoelectronic System ◽  
Sensor Fabrication

Thin polycrystalline diamond films chemically vapor deposited on thinned silicon substrates were used as membranes for pressure sensor fabrication by means of selective chemical etching of silicon. The sensing element is based on a simple low-finesse Fabry–Pérot (FP) interferometer. The FP cavity is defined by the end-face of a single mode fiber and the diamond diaphragm surface. Hence, pressure is evaluated by measuring the cavity length by an optoelectronic system coupled to the single mode fiber. Exploiting the excellent properties of Chemical Vapor Deposition (CVD) diamond, in terms of high hardness, low thermal expansion, and ultra-high thermal conductivity, the realized sensors have been characterized up to 16.5 MPa at room temperature. Preliminary characterizations demonstrate the feasibility of such diamond-on-Si membrane structure for pressure transduction. The proposed sensing system represents a valid alternative to conventional solutions, overcoming the drawback related to electromagnetic interference on the acquired weak signals generated by standard piezoelectric sensors.

Microwave Joining of Silicon Carbide Using Several Different Approaches

1992 ◽  
Vol 269 ◽  
Author(s):  
Iftikhar Ahmad ◽  
Richard Silberglitt ◽  
W. Murray Black ◽  
Hussamaldin S. Sa'Adaldin ◽  
Joel D. Katz
Keyword(s):  
Silicon Carbide ◽  
Resonant Cavity ◽  
Single Mode ◽  
Multi Mode ◽  
Single Mode Cavity ◽  
Sintered Silicon ◽  
Arbitrary Shapes

ABSTRACTMicrowave joining of sintered silicon carbide, both to itself and reaction bonded silicon carbide, has been accomplished in a single mode rectangular resonant cavity. Several approaches using different interlayer materials were employed to join sintered silicon carbide. Effective joining of reaction bonded silicon carbide to itself and sintered silicon carbide was accomplished without the use of any interlayer material in the single mode resonant cavity as well as in a multi-mode oven. Specimens cut from 0.95 cm diameter rods were joined in the single mode cavity, whereas a variety of arbitrary shapes and larger specimens (of reaction bonded silicon carbide) were joined in the multi-mode oven.

Joining Ceramics Using Microwave Energy

1993 ◽  
Vol 314 ◽  
Author(s):  
Iftikhar Ahmad ◽  
Richard Silberglitf
Keyword(s):  
Silicon Carbide ◽  
Silicon Nitride ◽  
Processing Time ◽  
Single Mode ◽  
Microwave Energy ◽  
Internal Heating ◽  
The Past ◽  
Complex Shapes ◽  
Microwave Applicator ◽  
Sintered Silicon

AbstractIn the past several years there has been an explosive growth in the use of microwave energy for the processing of a host of materials. Microwave energy provides rapid internal heating which results in an overall reduction in the processing time. The important features of microwave processing are described, as well as several applications.Microwave energy has been used by a few groups for the joining of alumina, mullite, silicon nitride and silicon carbide. The work performed by these groups will be reviewed. Typically, a single mode microwave applicator has been used to join ceramics at temperatures ranging between 1250°C - 1800°C. Microwave joining of ceramics was achieved in a matter of minutes, in contrast to hours reported by conventional methods. The strength of the joints was equal to or greater than the as-received materials. Joining of specimens of sintered silicon carbide (Hexoloy ™ ) using interlayers, and direct joining of reaction bonded silicon carbide (RBSC) to itself and Hexoloy™ has been accomplished recently. Both single mode and multimode microwave applicators were used and larger specimens of RBSC having complex shapes were joined using hybrid heating. The paper describes microwave joining apparatus, techniques and results.

scholarly journals Microscale diamond protection for a ZnO coated fiber optic sensor

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Monika Kosowska ◽  
Paulina Listewnik ◽  
Daria Majchrowicz ◽  
Michał Rycewicz ◽  
Mikhael Bechelany ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Microwave Plasma ◽  
Mechanical Damage ◽  
Chemical Vapor ◽  
Single Mode ◽  
Atomic Layer ◽  
Single Mode Fiber ◽  
Optical Measurements ◽  
Fiber Optic Sensor ◽  
Sensor Structure

Abstract Fiber optic sensors are widely used in environmental, biological and chemical sensing. Due to the demanding environmental conditions in which they can be used, there is a risk of damaging the sensor measurement head placed in the measuring field. Sensors using nanolayers deposited upon the fiber structure are particularly vulnerable to damage. A thin film placed on the surface of the fiber end-face can be prone to mechanical damage or deteriorate due to unwanted chemical reactions with the surrounding agent. In this paper, we investigated a sensor structure formed with a Zinc Oxide (ZnO) coating, deposited by Atomic Layer Deposition (ALD) on the tip of a single-mode fiber. A nanocrystalline diamond sheet (NDS) attached over the ZnO is described. The diamond structure was synthesized in a Microwave Plasma Assisted Chemical Vapor Deposition System. The deposition processes of the nanomaterials, the procedure of attaching NDS to the fiber end-face covered with ZnO, and the results of optical measurements are presented.

FIBER LASER HYDROPHONES AS PRESSURE SENSORS

2006 ◽  
Vol 21 (supp01) ◽  
pp. 102-106
Author(s):  
P. E. BAGNOLI ◽  
N. BEVERINI ◽  
E. CASTORINA ◽  
E. FALCHINI ◽  
R. FALCIAI ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Acoustic Waves ◽  
Dynamic Pressure ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Single Mode ◽  
High Energy ◽  
Single Mode Fiber ◽  
Wavelength Shift ◽  
Order Of Magnitude

The development of hydro-phonic sensors for deep see acoustic detection is described. The sensitive element is an erbium-doped single mode fiber laser, with the cavity delimited by two Bragg grating reflectors. The variations of temperature and pressure perturb the cavity, inducing a wavelength shift. The very narrow emission band of the laser, together with the interferometric detection technique, allows a dynamic pressure sensitivity in the μ Pa range. The devices have been characterized both optically and acoustically in a closed tub. A resin coating of the fiber laser has been experimented: this technique improves the sensitivity by more than one order of magnitude. The high sensitivity makes these sensors suitable for the detection of the acoustic waves induced in water by Ultra High Energy Neutrinos.

Sintered Silicon Carbide: A New Ceramic Vessel Material for Microwave Chemistry in Single-Mode Reactors

2010 ◽  
Vol 16 (40) ◽  
pp. 12182-12194 ◽  
Author(s):  
Bernhard Gutmann ◽  
David Obermayer ◽  
Benedikt Reichart ◽  
Bojana Prekodravac ◽  
Muhammad Irfan ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Single Mode ◽  
Microwave Chemistry ◽  
Ceramic Vessel ◽  
Vessel Material ◽  
Sintered Silicon

scholarly journals Temperature Sensor Based on Side-Polished Fiber SPR Device Coated with Polymer

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4063 ◽  
Author(s):  
Shuhui Liu ◽  
Shaoqing Cao ◽  
Zhe Zhang ◽  
Ying Wang ◽  
Changrui Liao ◽  
...  
Keyword(s):  
Temperature Sensor ◽  
Gold Film ◽  
Single Mode ◽  
Cost Effective ◽  
Single Mode Fiber ◽  
Uv Curable ◽  
Spr Sensor ◽  
Highly Sensitive ◽  
Sensor Structure ◽  
Side Polished Fiber

A highly sensitive temperature sensor based on surface plasmon resonance (SPR) of a side-polished single mode fiber is demonstrated. The sensor consists of a gold film coated side-polished fiber covered by a layer of UV-curable adhesive. Before introducing the UV-curable adhesive, the gold-coated fiber exhibits refractive index (RI) sensitivity of 1691.6 nm/RIU to 8800 nm/RIU in the range of 1.32 to 1.43. The resonant wavelength of the SPR sensor shifts to 650 nm when the adhesive is coated on the gold film, and is fixed at about 725 nm when the adhesive is cured. Due to the high thermo-optic and thermal expansion coefficient of the adhesive, the sensor structure achieves a temperature sensitivity of −0.978 nm/°C between 25 °C and 100 °C. The proposed optical fiber SPR sensor is simple, highly sensitive and cost effective, which may find potential applications for temperature measurements in the biomedical and environmental industries.

Effect of Microstructure on Removal Mechanism of Solid State Sintered Silicon Carbide in Polishing Procedure

2010 ◽  
Vol 434-435 ◽  
pp. 21-23
Author(s):  
Jian Qin Gao ◽  
Zheng Ren Huang ◽  
Jian Chen ◽  
Gui Lin Liu ◽  
Xue Jian Liu
Keyword(s):  
Silicon Carbide ◽  
Solid State ◽  
Optical Materials ◽  
High Hardness ◽  
Pull Out ◽  
Sic Ceramics ◽  
Sic Ceramic ◽  
Mechanical Procedure ◽  
High Space ◽  
Sintered Silicon

Solid state sintered silicon carbide (S-SiC) ceramic is one of the top optical materials for high space reliability and other excellent properties. Two microstructures were produced by sintering under different conditions. The effects of microstructure on removal rates of SiC ceramics during polishing processes were studied. The material removal mechanisms during polishing were analysed and modeled. With the increase of the aspect ratio and grain diameter size during polishing, grain pull-out is more difficult in elongated grains than in exquiaxed grains. The SiC ceramic with high hardness has high removal resistance leading to get bad surface quality under the same mechanical procedure. The samples with elongated microstructure have low hardness and surface toughness.

scholarly journals Optimization Design of SNS Sensor Structural Parameters for Battery Expansion Monitoring

2021 ◽  
Vol 9 ◽  
Author(s):  
Shibo Xu ◽  
Zhe Wang ◽  
Hanrui Yang ◽  
Shengxi Jiao ◽  
Jien Liu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Electrolyte Solution ◽  
Optimization Design ◽  
Structural Parameters ◽  
Single Mode ◽  
Measurement Range ◽  
Single Mode Fiber ◽  
Fiber Sensor ◽  
Sensor Structure ◽  
Core Fiber

In this article, a method to improve refractive index (RI) sensitivity of single‐mode–no core–single‐mode fiber (SNS) sensor structure is addressed by optimization of geometric parameters of no-core fiber (NCF), which could be used to accurately measure the irreversible deformation of the battery expansion state caused by temperature change. From the perspective of temperature changing RI of the electrolyte solution, the impacts of diameter, length, and waveband on the performance of the fiber sensor have been discussed as RI measurement range is 1.340–1.390. After optimization, RI sensitivity can reach approximately 2,252.7 and 2037.3 nm/RIU with the length of 6.55 and 6.75 mm when the RI is from 1.380 to 1.390.

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