2D Holographic Spectrometer for Wellbore Material Characterization
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Solution Overview
Problem
Current dispersive spectrometers for material characterization in the oil and gas industry have limited spectral resolution, leading to reduced signal-to-noise ratio and increased measurement collection times, making them unsuitable for compact, real-time in-situ analysis in wellbores and reservoirs.
Innovation Solution
The use of a 2D digital planar hologram (DPH) spectrometer with a 2D waveguide layer featuring discrete patterns etched on a substrate, allowing for high spectral resolution and compactness, enabling real-time in-situ material characterization with improved signal-to-noise ratio and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If narrow slit apertures are used to increase spectral resolution, then spectral resolution is improved, but signal-to-noise ratio deteriorates
Solution Approach 1:
The patent transitions from traditional 1D slit-based dispersion to a 2D digital planar hologram architecture. The 2D waveguide layer with etched discrete patterns enables spectral dispersion in two dimensions, allowing high spectral resolution without the signal loss inherent in narrow 1D slits. This dimensional change fundamentally resolves the trade-off between resolution and signal-to-noise ratio.
Solution Approach 2:
The invention replaces mechanical slit apertures with a digital planar hologram implemented in a 2D waveguide layer. Instead of using physical narrow slits to achieve spectral resolution, the system uses digitally programmed holographic patterns that can be etched on the waveguide, eliminating the need for narrow mechanical apertures and their associated signal loss.
2Measurement precision
If the length of the dispersive spectrometer is increased to achieve desirable resolution, then spectral resolution is improved, but device compactness is hindered
Solution Approach 1:
The patent compresses the spectrometer from a long 1D linear configuration into a compact 2D planar structure. By implementing the dispersive element as a 2D digital planar hologram in a waveguide layer, the system achieves high spectral resolution within a dramatically reduced footprint, enabling deployment in space-constrained environments like wellbores.
Solution Approach 2:
The invention nests the dispersive functionality within a compact 2D waveguide layer structure. The digital planar hologram is etched directly onto the waveguide substrate, creating a nested integration where the dispersive element is embedded within the waveguide itself rather than requiring separate external components, thus achieving compactness.
3Device complexity
If traditional dispersive spectrometers are used with limited channels, then device simplicity is maintained, but measurement quality and spectral resolution are reduced
Solution Approach 1:
The patent fundamentally changes the architectural parameters of the spectrometer by transitioning from a limited-channel traditional dispersive design to a high-channel-count digital planar hologram system. The 2D waveguide layer with etched discrete patterns enables hundreds or thousands of spectral channels, dramatically improving spectral resolution and measurement quality while maintaining a relatively simple overall device structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
DPH spectrometers provide high spectral resolution and compactness, enabling real-time, in-situ material characterization of wellbore and reservoir fluids, reducing measurement times and improving data accuracy, and are tolerant to drastic changes in sample conditions.
Implementation Method 1
a 2D waveguide layer to transmit and to disperse electromagnetic radiation according to wavelength, the 2D waveguide layer including a plurality of detector elements disposed along an edge of the 2D waveguide layer
Data Source
AI summary
A tool including a dispersive spectrometer deployable within a wellbore is provided. The dispersive spectrometer includes a waveguide layer to detect electromagnetic radiation according to wavelength. The dispersive spectrometer also includes a plurality of detector elements disposed along the waveguide layer to detect electromagnetic radiation associated with a portion of the wavelength of the electromagnetic radiation. A method for using the tool in a subterranean application is also provided.