Multi-parameter interferometric fiber optic sensor
AssigneeHalliburton Energy Services, Inc.
InventorsNeal G. Skinner, John R. Dennis, Michel LeBlanc
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Abstract
A fiber optic sensor system permits multiple parameters to be sensed using a single sensor. In a described embodiment, a method of sensing multiple parameters is provided in which an interferometric fiber optic sensor is connected to a variable wavelength light source. Light is transmitted from the light source through the sensor, with the light being swept over a range of wavelengths to measure relatively low frequency signals, and the light being maintained at a constant wavelength to measure relatively high frequency signals.
Claims25
A method of sensing multiple parameters, comprising the steps of:
- providing an interferometric fiber optic sensor;
- connecting a variable wavelength light source to the sensor;
- measuring a relatively low frequency signal by transmitting light from the light source through the sensor, the light output from the light source being swept over a range of wavelengths;
- and
- measuring a relatively high frequency signal by transmitting light from the light source through the sensor, the light output from the light source being maintained at a relatively constant wavelength.
A fiber optic sensor system for use in measuring relatively low frequency and relatively high frequency signals, the system comprising:
- at least one interferometric fiber optic sensor exposed to both of the relatively low and high frequency signals;
- and
- a variable wavelength light source connected to the sensor, the light source transmitting a sweep of light wavelengths through the sensor and transmitting a relatively constant wavelength through the sensor, the relatively low frequency signal being measured during the transmission of the sweep of light wavelengths, and the relatively high frequency signal being measured during the transmission of the relatively constant wavelength.
A fiber optic sensor system for use in measuring relatively low frequency and relatively high frequency pressure signals in a subterranean well, the system comprising:
- at least one interferometric fiber optic sensor exposed to both of the relatively low and high frequency pressure signals in the well;
- and
- a variable wavelength light source connected to the sensor, the light source transmitting a sweep of light wavelengths through the sensor and transmitting a relatively constant wavelength through the sensor, the relatively low frequency signal being measured during the transmission of the sweet of light wavelengths, and the relatively high frequency signal being measured during the transmission of the relatively constant wavelength.
Dependencies are inferred from the claim text.