MOEMS Device with Tunable Fabry-Pérot Cavity for Compact Sensing
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Solution Overview
Problem
Current micro-opto-electro-mechanical systems (MOEMS) for small vehicles like UAVs and micro-satellites face challenges in miniaturization, requiring compact, low-power, and highly sensitive sensors that are not optimized for integration, particularly in space environments where mass, size, and power are limited, and existing technologies are costly and complex.
Innovation Solution
A MOEMS device is developed with a chip-based design incorporating anchors, springs, proof masses, and optical elements like metallic mirrors and Bragg mirrors, integrated with waveguides and photodetectors to create compact accelerometers and gyroscopes that measure acceleration and rotational rates using tunable Fabry-Pérot cavities and variable optical attenuators, enabling multi-axis sensing on a single platform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optical sensing systems are used with laser illumination and optical spectrum analyzers, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent integrates the light source, waveguides, modulating element, and photodetector into a single compact MOEMS device on one substrate. This merging of previously separate components (laser, OSA, modulators, detectors) into an integrated photonic platform directly reduces system complexity while maintaining sensing precision through on-chip optical path control
Solution Approach 2:
The MOEMS device performs multiple functions within a single integrated structure: it generates light, guides it through waveguides, modulates the light to encode sensing information, and detects the modulated signal. This multi-functionality eliminates the need for separate laser illumination systems and optical spectrum analyzers, reducing both complexity and cost while preserving measurement capabilities
2Measurement precision
If traditional separate sensor components are used for attitude control systems, then measurement precision is maintained, but mass and volume increase
Solution Approach 1:
The patent combines multiple discrete sensor components into a single integrated MOEMS device on one substrate. By merging the optical path, modulating elements, and detection components into one compact unit, the overall mass and volume of the attitude control sensing system are dramatically reduced while preserving measurement precision through maintained optical sensitivity
Solution Approach 2:
The patent implements a nested structure where the modulating element is positioned within the optical path formed by the waveguides, and the photodetector is integrated at the output end of the same substrate. This nesting of functional elements within a compact hierarchical arrangement minimizes the spatial footprint and mass of the sensing system while maintaining precise optical measurement capabilities
3Measurement precision
If traditional optical sensing components are used, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent integrates the light source and photodetector in close proximity on the same substrate, allowing for optimized optical coupling and reduced energy loss. This merging enables more efficient light generation and detection, reducing the power required to achieve the same signal-to-noise ratio compared to traditional separated components with longer optical paths and higher losses
Solution Approach 2:
The patent replaces traditional mechanical optical alignment systems with integrated photonic waveguides that provide stable, alignment-free light transmission. This substitution eliminates the need for complex mechanical adjustment mechanisms and reduces power consumption associated with active stabilization systems, while maintaining measurement precision through the inherent stability of the integrated optical path
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
The solution provides highly sensitive, cost-effective, and compact sensors for attitude control systems, reducing system mass and power consumption while improving reliability and integration capabilities, enabling efficient navigation in space-based systems.
Implementation Method 1
The MOEMS device comprises a movable optical element and a fixed optical element forming a Fabry-Pérot cavity
Implementation Method 2
The MOEMS device comprises a movable optical element and a fixed optical element forming a Bragg mirror
Implementation Method 3
The second waveguide is adapted for operatively coupling to a photodetector
Data Source
AI summary
A micro-opto-electromechanical systems (MOEMS) device is described. The device comprises at least one anchor on a chip; at least one spring connected to the anchor; at least one proof mass connected to the spring, the at least one proof mass being movable with respect to the chip; a movable optical element connected to the at least one proof mass; a first waveguide connected to the chip, the first waveguide being adapted for receiving light from a light source and a second waveguide connected to the chip, the second waveguide being adapted for operatively coupling to a photodetector and the movable optical element being disposed between the back end of the first waveguide and the front end of the second waveguide.