The Fiber Fabry-Perot And Its Applications As A Fiber-Optic Sensor Element.

Kist, R.; Ramakrishnan, S.; Wölfelschneider, H.

doi:10.1117/12.951149

Cited by 6 publications

(3 citation statements)

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“…The fiber Fabry-Perot was manufactured in the laboratory by cleaving a single-mode fiber inside a close fitting capillary tube. 2 The two portions of fiber are secured with adhesive to the capillary tube to provide a stable reflective splice. The interferometers are illuminated by a 5-mW semiconductor laser, with a nominal wavelength of 780 nm (Hitachi HL 7801).…”

Section: Methodsmentioning

confidence: 99%

Reduction of semiconductor laser diode phase and amplitude noise in interferometric fiber optic sensors

et al. 1989

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An optical configuration employing two conventional Michelson interferometers and a fiber Fabry-Perot interferometer connected in parallel is used to demonstrate the principle of common mode rejection of both the amplitude and frequency noise of a semiconductor laser. Common mode noise rejection is maximized when the outputs of the two interferometers with matched path imbalance, fringe visibility and amplitude are differentially combined. One interferometer is used as a reference, and the other as a sensing interferometer. The fiber Fabry-Perot interferometer is used as the sensing interferometer and is demonstrated as a miniature acoustic sensing element.

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Section: Methodsmentioning

confidence: 99%

Reduction of semiconductor laser diode phase and amplitude noise in interferometric fiber optic sensors

et al. 1989

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“…These two reflections interfere and the intensity of the light is dependent upon the length of the cavity. The reflection intensity of a low-finesse Fabry-Perot cavity can be express as follows [4] ( )…”

Section: Principles Of the Fiber Optic Efpi Sensormentioning

confidence: 99%

“…But the interferometric sensors based on Mach-Zehnder, Michelson or Sagnac interferometers include a sensing leg and a reference leg, which makes it difficult to reduce the dimension of the sensor head. However, fiber optic EFPI sensors not only posses high sensitivity, but also provide 'point' sensing [3,4]. Many kinds of fiber optic EFPI sensors were developed in recent years such as strain gauges, extensometers, pressure sensors, hydrophones, accelerometers, and skin friction gages.…”

Section: Introductionmentioning

confidence: 99%

A novel fiber optic concrete sensor based on EFPI

et al. 2007

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In this paper, a novel fiber optic concrete sensor based on extrinsic fiber Fabry-Perot interferometer (EFPI) is designed and analyzed. Two fiber ends are inserted into a glass capillary and encapsulated into a cement cylinder to act as the sensor head. In this way, the cement cylinder itself is the sensor head instead of the traditional steel tube, which makes it very convenient to embed the sensor head into the concrete, because the cement consists with the concrete well. Based on the theory of white light interferometry and the theory of elasticity, the wavelength modulation method and the strain transfer are analyzed theoretically. The demodulation system is also introduced in this paper. The experiment being made by our research group is aimed at testing the consistency, stability, reliability and the sensitivity of the fiber optic sensor. The sensor head of the cement cylinder is embedded into a model ferroconcrete beam together with traditional strain gauges. The experiment is carried out using the PEM-500A hydraulic pulsation fatigue test machine after 2 million stress circles. The readout of the fibre optic sensor and the strain gauges is recorded and made a contrast. It can be found from the result that the fibre optic sensors have good stability and reliability, the accuracy for the fibre optic sensor is better than 0.5 micro-strain, which shows that the sensor can meet the demand of the long-term monitoring of large-size concrete structure.

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