System and method for measurement incorporating a crystal resonator
First Claim
1. A system for interrogating a downhole environment in a borehole beneath a surface, comprising:
- a source of electromagnetic energy, operable to transmit an electromagnetic signal in the borehole;
a sensor module, comprising a passive resonating circuit, the passive resonating circuit comprising a crystal having a resonant frequency that varies with changes in the condition in the downhole environment such that the resonating circuit returns at least a portion of the electromagnetic signal in response to a condition in the downhole environment in the borehole;
a detector configured and arranged to detect a power level of the source of electromagnetic energy; and
a resonant frequency identifying circuit configured and arranged to identify the resonant frequency based on the detected power level.
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Accused Products
Abstract
A system, method and device for interrogating a downhole environment in a borehole beneath a surface includes a source of electromagnetic energy, operable to transmit an electromagnetic signal in the borehole, a sensor module, including a passive resonating circuit including a crystal oscillator having a resonant frequency that varies with changes in the condition in the downhole environment to reflect the electromagnetic signal and to modulate the electromagnetic signal in response to a condition in the downhole environment in the borehole and a detector positionable to receive the reflected modulated electromagnetic signal. Embodiments include a power monitor and circuitry configured and arranged to measure an input frequency at a time when an inflection in the applied power is observed.
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Citations
16 Claims
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1. A system for interrogating a downhole environment in a borehole beneath a surface, comprising:
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a source of electromagnetic energy, operable to transmit an electromagnetic signal in the borehole; a sensor module, comprising a passive resonating circuit, the passive resonating circuit comprising a crystal having a resonant frequency that varies with changes in the condition in the downhole environment such that the resonating circuit returns at least a portion of the electromagnetic signal in response to a condition in the downhole environment in the borehole; a detector configured and arranged to detect a power level of the source of electromagnetic energy; and a resonant frequency identifying circuit configured and arranged to identify the resonant frequency based on the detected power level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for interrogating a downhole environment in a borehole beneath a surface, comprising:
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transmitting an electromagnetic signal in the borehole; returning at least a portion of the electromagnetic signal in response to a condition in the downhole environment in the borehole using a passive resonating circuit, the passive resonating circuit comprising a crystal having a resonant frequency that varies with changes in the condition in the downhole environment; detecting a power level of the source of electromagnetic energy; and identifying the resonant frequency based on the detected power level. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification