Miniature Corrugated Diaphragm for Fiber-Optic-Linked Pressure Sensing (FOLPS)

2003 ◽  
Author(s):  
Hong-Seok Noh ◽  
Sangkyung Kim ◽  
Peter J. Hesketh ◽  
Hua Mao ◽  
Lid Wong
Keyword(s):  
Stainless Steel ◽  
Pressure Transducer ◽  
Biomedical Applications ◽  
Fiber Optic ◽  
Optical Sensing ◽  
Low Pressure ◽  
Test Results ◽  
Steel Tubes ◽  
Pressure Sensing ◽  
Reflective Surface

This paper presents miniature (diameter less than 1.5 mm) corrugated parylene/Cr/parylene diaphragms that provide ultra sensitive load-deflection (±100 μm for ±1kPa) and reflective surface for optical sensing. The design, fabrication, and test results of the ultra low pressure transducer for biomedical applications are reported here. The diaphragms have been attached to stainless steel tubes that are suitable for most endoscopes.

Towards Integrated Sensors for Environments with Temperatures up to 600 °C

2016 ◽  
Vol 2016 (HiTEC) ◽  
pp. 000051-000055 ◽  
Author(s):  
Ayden Maralani ◽  
Levent Beker ◽  
Albert P. Pisano
Keyword(s):  
Performance Evaluation ◽  
High Temperatures ◽  
Pressure Transducer ◽  
Harsh Environments ◽  
Test Results ◽  
Pressure Sensing ◽  
Sensing Systems ◽  
Interface Circuitry ◽  
Circular Diaphragm ◽  
Type Pressure

Abstract The main objective is to develop sensing systems by integrating transducers such as pressure sensing elements with the interface circuitry in one package that can withstand harsh environments, particularly high temperatures up to 600 °C. To achieve that, both pressure transducer and interface circuitry are individually required to operate and survive up to 600 °C with acceptable degrees of reliability. This paper reports performance evaluation of fabricated 4H-SiC JFETs along with differential pairs for use in the interface circuitry. The test results are very promising and show stable performances from 25 °C up to 600 °C. Moreover, design, fabrication, and early test of a SiC based circular diaphragm type pressure transducer is also reported.

Dynamic pressure sensing with a fiber-optic polarimetric pressure transducer with two-wavelength passive quadrature readout

1998 ◽  
Vol 37 (4) ◽  
pp. 663 ◽  
Author(s):  
Norbert Fürstenau ◽  
Markus Schmidt ◽  
Wojtek J. Bock ◽  
Waclaw Urbanczyk
Keyword(s):  
Pressure Transducer ◽  
Fiber Optic ◽  
Dynamic Pressure ◽  
Pressure Sensing

An Experimental Study of Friction Factor in the Transition Region for Single Phase Flow in Mini- and Micro-Tubes

2008 ◽  
Author(s):  
Afshin J. Ghajar ◽  
Rahul P. Rao ◽  
Wendell L. Cook ◽  
Clement C. Tang
Keyword(s):  
Experimental Study ◽  
Friction Factor ◽  
Transition Region ◽  
Pressure Transducer ◽  
Single Phase ◽  
Tube Diameter ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Steel Tubes ◽  
Pressure Sensing

A systematic and accurate experimental investigation of friction factor in the transition region for single phase flow in mini- and micro-tubes has been performed for eight stainless steel tubes with diameters ranging from 2083 μm to 667 μm. The pressure drop measurements were carefully performed by paying particular attention to the sensitivity of the pressure-sensing diaphragms used in the pressure transducer. Experimental results indicated that the start and end of the transition region was influenced by varying the tube diameter. The friction factor profile was not significantly affected for the tube diameters between 2083 μm and 1372 μm. However, the influence of the tube diameter on the friction factor profile became noticeable as the diameter decreased from 1372 μm to 667 μm.

Toward Integrated Pressure Sensors for Temperatures up to 600°C

2016 ◽  
Vol 13 (4) ◽  
pp. 163-168
Author(s):  
Ayden Maralani ◽  
Levent Beker ◽  
Albert P. Pisano
Keyword(s):  
Pressure Transducer ◽  
Field Effect Transistors ◽  
Pressure Sensors ◽  
Harsh Environments ◽  
Test Results ◽  
Pressure Sensing ◽  
Pressure Transducers ◽  
Sensing Systems ◽  
Interface Circuitry ◽  
Type Pressure

The main objective of this study is to develop pressure-sensing systems by integrating pressure transducers with the interface circuitry in one package that can withstand harsh environments, particularly high temperatures up to 600°C. To achieve that, both pressure transducer and interface circuitry are individually required to operate and survive up to 600°C with acceptable degrees of reliability. This article reports performance evaluation of fabricated 4H-SiC Junction Field Effect Transistors along with differential pairs for use in the interface circuitry. The test results are very promising and show stable performances from 25°C up to 600°C. Moreover, design, fabrication, and early test (from 25°C up to 100°C) of an SiC-based circular diaphragm-type pressure transducer are also reported.

Pyrolytic carbon filaments and associated catalytic particles formed in steel tubes

1984 ◽  
Vol 42 ◽  
pp. 662-663
Author(s):  
Y. L. Chen ◽  
J. R. Bradley
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Catalyst Particle ◽  
Pyrolytic Carbon ◽  
Plain Carbon Steel ◽  
304 Stainless Steel ◽  
Hydrocarbon Gases ◽  
Steel Tubes ◽  
Filamentous Carbon ◽  
Carbon Filaments

Considerable effort has been directed toward an improved understanding of the production of the strong and stiff ∼ 1-20 μm diameter pyrolytic carbon fibers of the type reported by Koyama and, more recently, by Tibbetts. These macroscopic fibers are produced when pyrolytic carbon filaments (∼ 0.1 μm or less in diameter) are thickened by deposition of carbon during thermal decomposition of hydrocarbon gases. Each such precursor filament normally lengthens in association with an attached catalyst particle. The subject of filamentous carbon formation and much of the work on characterization of the catalyst particles have been reviewed thoroughly by Baker and Harris. However, identification of the catalyst particles remains a problem of continuing interest. The purpose of this work was to characterize the microstructure of the pyrolytic carbon filaments and the catalyst particles formed inside stainless steel and plain carbon steel tubes. For the present study, natural gas (∼; 97 % methane) was passed through type 304 stainless steel and SAE 1020 plain carbon steel tubes at 1240°K.

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