Fibre optic pressure and temperature sensor for geothermal wells

Bremer, Kort; Lewis, Elfed; Leen, Gabriel; Moss, Brian; Lochmann, Steffen; Mueller, I.; Reinsch, Thomas; Schroetter, J.

doi:10.1109/icsens.2010.5690125

Cited by 24 publications

(19 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1, see e.g. [17] for details. The sensor head is entirely fabricated from fused-silica elements, i.e.…”

Section: Principle Of Operationmentioning

confidence: 99%

“…Moreover, as γ is sensitive to the EFPI cavity lengths L1 and L2, applied pressure, as well as temperature, cavity length changes introduce an error when measuring the RI of the surrounding medium. As investigated in [17] the change of the EFPI air cavity length depends linearly on a change of applied pressure ΔL1 ̴ ΔP (0.054μm/MPa) and temperature ΔL1 ̴ ΔT (1.9·10 -4 µm/°C). Moreover, the length change of the EFPI glass cavity due to applied pressure and temperature can be calculated as 9.1·10 -6 L2/MPa and 5·10 -7 L2/°C for silica glass [25], respectively.…”

Section: Cross-sensitivity To Applied Pressure and Temperaturementioning

confidence: 99%

“…The selected cavity lengths L1 and L2 represent a trade-off in terms of the performance of determining the RI of the surrounding on one side and the sensor interrogation using the interrogation set-up and signal processing algorithm applied on the other side. The multi-parameter fibre optic sensor was interrogated using the interrogation system as reported previously [17], which consist on a broadband light Source (BBS) (INO FBS-C), an optical circulator as well as an optical spectrum analyser (Ando AQ6330). Moreover, as described in Section 3, γ and hence the RI of the surrounding were determined by calculating the ratio between the amplitudes of the second and first cosine term of Equation 1.…”

Section: Evaluation Sensitivity To Refractive Indexmentioning

confidence: 99%

“…In previous work we demonstrated the simultaneous measurement of pressure and temperature for pressures up to 30 MPa [17] and temperatures up to 430 °C [18] by using a fibre optic Extrinsic FabryPerot Interferometer (EFPI) sensor which contains an embedded Fibre Bragg Grating (FBG) reference sensor element. The sensor design has also been successfully tested up to 70 MPa under isothermal conditions [19].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Pressure, temperature and refractive index determination of fluids using a single fibre optic point sensor

Bremer

Reinsch

Leen

et al. 2017

Sensors and Actuators A: Physical

View full text Add to dashboard Cite

The accurate determination of physico-chemical fluid parameters is of major importance in many process engineering applications. Not only the monitoring of the phase distribution in piping systems but also the detection of chemical concentrations in liquids is of interest for an efficient, safe and reliable operation of laboratory as well as industry scale applications. In this paper, we present a miniature all-silica fiber optic sensor capable of measuring pressure, temperature and refractive index of a fluid at a single point simultaneously. In future, such a sensor can be utilized in applications, where these quantities and, hence, phase composition or chemical concentration have to be monitored possibly under harsh environments such as geothermal or oil drilling wells.

show abstract

“…1, see e.g. [17] for details. The sensor head is entirely fabricated from fused-silica elements, i.e.…”

Section: Principle Of Operationmentioning

confidence: 99%

Section: Cross-sensitivity To Applied Pressure and Temperaturementioning

confidence: 99%

Section: Evaluation Sensitivity To Refractive Indexmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pressure, temperature and refractive index determination of fluids using a single fibre optic point sensor

Bremer

Reinsch

Leen

et al. 2017

Sensors and Actuators A: Physical

View full text Add to dashboard Cite

show abstract

“…for geothermal projects where drilling will be performed to depths of about 10,000 m at expected temperatures up to 300°C (US Department of Energy 2009; Bremer et al 2010). Commercial piezoresistive silicon sensors, which are widely used in automotive industry, consumer electronics, and drilling are limited to temperatures of typically less than 175°C.…”

Section: Introductionmentioning

confidence: 99%

Fabrication, packaging, and characterization of p-SOI Wheatstone bridges for harsh environments

et al. 2011

View full text Add to dashboard Cite

Strain gauges in p-type silicon-on-insulator (SOI) were investigated for data logging during deep drilling. Different metallization systems (Ti/Pt/Au, Ti/Pd/ Au, and Ti/TiN/Au) were tested for high temperatures by measuring the specific resistance over time. Pressureassisted Pick-and-Place silver sintering was applied to attach the fabricated p-SOI Wheatstone bridges on substrate carriers. The influence of the joining technique on the offset voltage was investigated as well as the temperature behavior during temperature cycling (50 cycles from 30°C up to 250°C). Furthermore, the temperature dependence of noise was analyzed.

show abstract