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 having a resonant frequency that varies with changes in a condition in the downhole environment, such that the resonating circuit returns at least a portion of the electromagnetic signal along with harmonics of the resonant frequency in response to the condition in the downhole environment in the borehole;
a detector, positionable to receive the returned portion of the electromagnetic signal, the detector including a filter configured and arranged to attenuate a signal at the resonant frequency, and configured and arranged to pass a signal at a harmonic of the resonant frequency.
1 Assignment
0 Petitions
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 resonator having a resonant frequency that varies with changes in the condition in the downhole environment to reflect the electromagnetic signal and generates harmonic frequencies in response to a condition in the downhole environment in the borehole and a detector positionable to receive a returned electromagnetic signal. Embodiments include a filter to pass a harmonic of the resonant frequency of the resonating circuit and circuitry configured and arranged to measure the frequency of the harmonic signal.
-
Citations
20 Claims
-
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 having a resonant frequency that varies with changes in a condition in the downhole environment, such that the resonating circuit returns at least a portion of the electromagnetic signal along with harmonics of the resonant frequency in response to the condition in the downhole environment in the borehole; a detector, positionable to receive the returned portion of the electromagnetic signal, the detector including a filter configured and arranged to attenuate a signal at the resonant frequency, and configured and arranged to pass a signal at a harmonic of the resonant frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A method of interrogating a downhole environment in a borehole beneath a surface, comprising:
-
transmitting an electromagnetic signal in the borehole; returning at least a portion of the electromagnetic signal along with harmonics of a resonant frequency of a sensor module comprising a passive resonating circuit, the resonant frequency varying with changes in a condition in the downhole environment, in response to the condition in the downhole environment in the borehole; receiving the returned portion of the electromagnetic signal, with a detector; and filtering the received signal to attenuate the signal at the resonant frequency, and to pass a signal at a harmonic of the resonant frequency. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification