Evaluation of glued-diaphragm fibre optic pressure sensors in a shock tube

An aerosol shock tube has been developed for measuring the ignition delay times (tig) of aerosol mixtures of low-vapor-pressure fuels and for visualization of the auto-ignition flow-field. The aerosol mixture was formed in a premixing tank through an atomizing nozzle. Condensation and adsorption of suspended droplets were not observed significantly in the premixing tank and test section. A particle size analyzer was used to measure the Sauter mean diameter (SMD) of the aerosol droplets. Three pressure sensors and a photomultiplier were used to detect local pressure and OH emission respectively. Intensified charge-coupled device cameras were used to capture sequential images of the auto-ignition flow-field. The results indicated that stable and uniform aerosol could be obtained by this kind of atomizing method and gas distribution system. The averaged SMD for droplets of toluene ranged from 2 to 5 μ m at pressures of 0.14–0.19 MPa of dilute gases. In the case of a stoichiometric mixture of toluene/O2/N2, ignition delay times ranged from 77 to 1330 μs at pressures of 0.1–0.3 MPa, temperatures of 1432–1716 K and equivalence ratios of 0.5–1.5. The logarithm of ignition delay times was approximately linearly correlated to 1000/T. In contrast to the reference data, ignition delay times of aerosol toluene/O2/N2 were generally larger. Sequential images of auto-ignition flow-field showed the features of flame from generation to propagation.

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Dynamic Compensation of Piezoresistive Pressure Sensor Based on Sparse Domain

Journal of Sensors ◽

10.1155/2020/8890028 ◽

2020 ◽

Vol 2020 ◽

pp. 1-8

Author(s):

Bo Xu ◽

Tailin Han ◽

Hong Liu ◽

Xiao Wang ◽

Mingchi Ju

Keyword(s):

Shock Wave ◽

Shock Tube ◽

Test Data ◽

Pressure Sensor ◽

Pressure Sensors ◽

The United States ◽

Positive Pressure ◽

Dynamic Compensation ◽

Tube Test ◽

Shock Tube Test

In the process of transient test, due to the insufficient bandwidth of the pressure sensor, the test data is inaccurate. Firstly, based on the projection of the shock tube test signal in the sparse domain, the feature expression of the signal sample is obtained. Secondly, the problem of insufficient bandwidth is solved by inverse modeling of sensor dynamic compensation system based on swarm intelligence algorithm. In this paper, the method is used to compensate the shock tube test signals of the 85XX series pressure sensors made by the Endevco company of the United States, the working bandwidth of the sensor is widened obviously, the rise time of the pressure signal can be compensated to 12.5 μs, and the overshoot can be reduced to 8.96%. The repeatability of dynamic compensation is verified for the actual gun muzzle shock wave test data, the results show that the dynamic compensation can effectively recover the important indexes such as overpressure peak value and positive pressure action time, and the original shock wave signal is recovered from the high resonance data.

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Embedded micromachined fibre optic Fabry-Perot pressure sensors in aerodynamics applications

Proceedings of IEEE Sensors ◽

10.1109/icsens.2002.1037381 ◽

2003 ◽

Cited By ~ 2

Author(s):

M.J. Gander ◽

W.N. MacPherson ◽

J.S. Barton ◽

R.L. Reuben ◽

J.D.C. Jones ◽

...

Keyword(s):

Pressure Sensors ◽

Fibre Optic ◽

Fabry Perot

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Long-Life Fibre-Optic Pressure Sensors for Control and Monitoring of Combustion Engines

Advanced Microsystems for Automotive Applications 2000 ◽

10.1007/978-3-642-18146-7_10 ◽

2000 ◽

pp. 109-123 ◽

Cited By ~ 2

Author(s):

M. T. Wlodarczyk

Keyword(s):

Pressure Sensors ◽

Combustion Engines ◽

Fibre Optic ◽

Long Life

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A flowing liquid test system for assessing the linearity and time-response of rapid fibre optic oxygen partial pressure sensors

Respiratory Physiology & Neurobiology ◽

10.1016/j.resp.2012.06.007 ◽

2012 ◽

Vol 183 (2) ◽

pp. 100-107 ◽

Cited By ~ 7

Author(s):

R. Chen ◽

C.E.W. Hahn ◽

A.D. Farmery

Keyword(s):

Oxygen Partial Pressure ◽

Partial Pressure ◽

Pressure Sensors ◽

Test System ◽

Time Response ◽

Fibre Optic ◽

Flowing Liquid

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Experimental Characterization of a Remoting System for Dynamic Pressure Sensors

Volume 1: Turbo Expo 2005 ◽

10.1115/gt2005-68733 ◽

2005 ◽

Cited By ~ 3

Author(s):

Giovanni Ferrara ◽

Lorenzo Ferrari ◽

Gabriele Sonni

Keyword(s):

Shock Tube ◽

Combustion Chamber ◽

Operating Temperature ◽

Dynamic Pressure ◽

Pressure Sensors ◽

Measurement Point ◽

Experimental Characterization ◽

Temperature Capability ◽

Lower Operating Temperature

Concerning measurements with dynamic pressure sensors, one of the most interesting aspects is the influence of a remoting system interposed between the sensor and the measurement point. This mounting system, once correctly characterized, allows one to use the same sensor for different measurement points, reducing the total number of sensors used. In addition, in all the applications involving high temperatures (e.g. combustion chamber), a remoting system allows the use of cheaper dynamic pressure sensors with lower operating temperature capability. A remoting system for dynamic pressure sensors made up by a remoting duct, between the sensor and the measurement point, followed by a damping duct has been characterized for different tube lengths. Tests were carried out with two kinds of sources: a diaphragm-less shock tube for the first set of tests and an acoustic speaker for the second. Results are here reported and commented.

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