Optical Sensor Resonators for Extended Detection Range
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Solution Overview
Problem
Optical sensor arrangements with single optical resonators often saturate when detecting observables, leading to missed or misinterpreted measurements due to resonance frequency shifts being comparable to the free spectral range, limiting their detection range and accuracy.
Innovation Solution
The design incorporates multiple optical resonators with varying sizes and active layer concentrations to differentiate resonance frequency shifts, allowing for a broader detection range by configuring each resonator to have unique sensitivity and exposure to the observable, thereby extending the measurement range and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single optical resonator is used with high sensitivity configuration, then measurement precision is improved, but the resonator saturates when resonance frequency shifts become comparable to the free spectral range, limiting detection range
Solution Approach 1:
The patent divides a single high-sensitivity resonator into multiple resonators with different sensitivity characteristics. Each resonator is configured with different exposed portions or active layer concentrations, creating a segmented system where each segment handles different ranges of the observable, thus preventing saturation while maintaining overall precision
Solution Approach 2:
Different portions of the resonator system are given different qualities - specifically, different exposed surface areas or active layer concentrations. This local differentiation allows each resonator to have optimized sensitivity for specific ranges, enabling the system to measure across a broader spectrum without any single resonator becoming saturated
2Measurement precision
If the exposed portion of the resonator is increased to enhance sensitivity, then measurement precision is improved, but the resonator saturates more easily, reducing the detection range
Solution Approach 1:
The patent applies local quality by creating resonators with non-uniform active layer distribution or different exposed surface areas. Some resonators have larger exposed portions for high sensitivity to small changes, while others have smaller exposed portions to avoid saturation with larger changes, allowing the system to cover a broader detection range
Solution Approach 2:
The patent changes key parameters of the resonators - specifically the exposed surface area and active layer concentration - to create a family of resonators with different sensitivity characteristics. This parameter variation allows the system to maintain precision across different measurement ranges without saturation
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
This configuration enables the detection of observables over a wider range by ensuring that smaller exposure to the observable induces smaller resonance shifts in some resonators while larger exposures induce significant shifts in others, preventing saturation and enhancing measurement precision.
Implementation Method 1
Optical resonators have the property of allowing light of a specific frequency that represents a resonance frequency of the optical resonator (i.e., the wavelength of the light multiplied by an integer corresponds to the effective refractive index multiplied by the length of the resonator) to enter the optical resonator while light of other wavelengths does not enter the resonator
Implementation Method 2
an entry port or a drop port is defined as a neighborhood between an optical path, such as a waveguide, and an optical resonator, such as a microring resonator, in which light traveling within either the waveguide or the optical resonator can enter the other through the evanescent field of the light component
Implementation Method 3
the optical resonator is covered by a covering material (or active layer) which includes an active material such that molecules of the substance to be detected can dock at the active material
Data Source
AI summary
An optical sensor arrangement for measuring an observable, the arrangement including an optical resonance circuit including at least a first and a second optical resonator, each of the optical resonators including an entry port for coupling light into the optical resonator and a drop port for decoupling light from the optical resonator. The first and second resonator are configured such that only a portion of the first and second resonator detects the presence of the observable, a size of the portion of the first resonator being different from a size of the portion of the second resonator. The optical resonance circuit further configured to be coupled to a light generation circuit and to a detector unit for detecting light.