Thermometry in geothermal wells: an optical approach

Fiorina, Lorenzo; Mezzetti, S.; Pizzolati, P. L.

doi:10.1364/ao.24.000402

Cited by 3 publications

(1 citation statement)

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“…where T is the absolute temperature of the gas, M is the molecular mass of the gas, R is the universal gas constant and γ is the ratio of heat capacities of the gas. Electrically passive thermometers, especially fibre optic versions, have been extensively studied in the past [11][12][13][14] and some solutions are already commercially available.…”

Section: The Controllermentioning

confidence: 99%

An electrically passive fluid level gauge based on an acoustic resonator

Đonlagić

1998

Meas. Sci. Technol.

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This paper describes a novel electrically passive fluid level gauge. It is based on a one-dimensional low-frequency acoustic gas resonator. The acoustical power is delivered to the resonator an the acoustic waveguide and a fibre-optic microphone is used as an acoustic pressure sensor. Distances of over 100 m between the electrically passive sensor and the electrically active controller were achieved in practice. The proposed method can be successfully implemented in systems where problems of residues, deposits, foams, etc, can be expected.

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Section: The Controllermentioning

confidence: 99%

An electrically passive fluid level gauge based on an acoustic resonator

Đonlagić

1998

Meas. Sci. Technol.

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Optical Temperature Sensors

Beheim

1995

Integrated Optics, Microstructures, and Sensors

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Fiber-linked interferometric pressure sensor

Beheim

Fritsch

Poorman

1987

Review of Scientific Instruments

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A fiber-optic pressure sensor is described which uses a diaphragm to modulate the mirror separation of a Fabry-Perot cavity (the sensing cavity). A multimode optical fiber delivers broadband light to the sensing cavity and returns the spectrally modulated light which the cavity reflects. The sensor's output spectrum is analyzed using It tunable Fabry-Perot cavity (the reference cavity) to determine the mismatch in the mirror separations of the two cavities. An electronic servo control uses this result to cause the mirror separation of the reference cavity to equal that of the sensing cavity. The displacement of the pressure-sensing diaphragm is then obtained by measuring the capacitance of the reference cavity's metal-coated mirrors. Relative to other fiber-optic sensors, an important advantage of this instrument is its high immunity to the effects of variations in both the transmissivity of the fiber link and the wavelength of the optical source.

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Thermometry in geothermal wells: an optical approach

Cited by 3 publications

References 1 publication

An electrically passive fluid level gauge based on an acoustic resonator

An electrically passive fluid level gauge based on an acoustic resonator

Optical Temperature Sensors

Fiber-linked interferometric pressure sensor

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