MOEMS Dynamic Optical Reflector for High Data Rate Tagging
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Solution Overview
Problem
Existing optical tagging systems face limitations in data rate, temperature range, and noise interference due to the use of liquid crystal and multiple quantum well components, and have restricted effective field of view and high manufacturing costs, making them unsuitable for wide-range and high-data-rate applications.
Innovation Solution
A compact dynamic optical tag system using a spacing-controllable etalon and retro-reflector with a coherent planar MOEMS structure and corner-cube arrays, which operates over a wide temperature range without stabilization, provides high data transfer rates and a wide field of view, and includes a self-contained power supply and dual-wavelength interrogation for improved signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If liquid crystal and multiple quantum well components are used in optical tagging systems, then modulation capability is improved, but data rate is limited to below 50 kbps and operating temperature range is restricted
Solution Approach 1:
The patent changes the fundamental operating parameters by replacing liquid crystal and multiple quantum well materials with a micromechanical modulator that operates on mechanical deformation of corner cube retro-reflectors. This mechanical approach enables data rates exceeding 50 kbps while maintaining modulation capability through physical shape changes of the retro-reflector elements rather than optical property changes of liquid crystals.
Solution Approach 2:
The patent substitutes mechanical micromachined corner cube retro-reflectors for the optical/electromagnetic mechanisms of liquid crystal and multiple quantum well modulators. The micromechanical modulator deforms the corner cubes to modulate the reflected light, providing a purely mechanical solution that achieves higher data rates and broader temperature operation without the material-specific limitations of liquid crystals or quantum well structures.
2Ease of operation
If liquid crystal and multiple quantum well components are used for modulation, then modulation functionality is achieved, but reliable operation over wide temperature range requires explicit temperature stabilisation mechanisms
Solution Approach 1:
The micromechanical modulator with corner cube retro-reflectors is inherently temperature-insensitive and does not require active temperature stabilization. The mechanical structure maintains its functionality across wide temperature ranges without external control systems, allowing the device to serve itself across varying environmental conditions rather than requiring complex thermal management infrastructure.
3Reliability
If known retro-reflector techniques are used, then communication link is established, but diffuse return from background objects creates significant noise limiting effective data rate and useful range
Solution Approach 1:
The patent applies local quality by making the corner cube retro-reflectors micromachined with precise geometries that concentrate reflected light into narrow beams returning to the source. This localized light concentration at the tag location creates a strong, directional return signal that stands out against the diffuse background noise, enabling reliable communication links at ranges exceeding 10 km despite the presence of background clutter.
4Ease of operation
If combinations of refractive or diffractive mirrors or lenses are used, then optical tagging is achieved, but effective field of view is restricted making remote interrogation difficult
Solution Approach 1:
The patent employs dynamic corner cube retro-reflectors that can change their shape or orientation in response to interrogation signals. This dynamic capability allows the retro-reflectors to maintain effective communication across a wide field of view by adapting their reflective properties, enabling remote interrogation from various angles and positions without the restricted field of view limitations of static refractive or diffractive optical elements.
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 system enables reliable communication at high data rates over a wide range of temperatures and angles, reduces noise interference, and is cost-effective, with enhanced signal-to-noise ratio and power efficiency.
Implementation Method 1
an optical signal incident upon the arrangement is filtered by the action of the etalon
Implementation Method 2
a retro-reflector arranged to retro-reflect light received via the etalon back through the etalon
Data Source
AI summary
A retro-reflective identification tag capable of modulating an optical signal whereby to support bi-directional communication with an associated remote optical interrogation device. The tag comprises a MOEMS modulating layer over a retro-reflective substrate, giving the tag a wide angle of effective operation. The tag modulator may optionally be switched on only responsive to detection of a precursor beam from the interrogation system in order to save power. The interrogation device may make use of multiple optical wavelengths for communicating with the tag.