Deformometer Optical Cavity Deformation Compensation
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Solution Overview
Problem
Conventional methods for determining deformation in optical cavities, such as Fabry-Perot refractometers and fixed-length optical cavities, face limitations due to deformation of optical elements when gas is injected, leading to inaccuracies in pressure measurement.
Innovation Solution
A deformometer system that combines multiple wavelengths of light or species of gas to measure deformation in optical cavities by determining the difference in index of refraction, using a combination of lasers, optical combiners, beam splitters, and detectors to analyze the deformation caused by gas pressure, thereby accounting for optical cavity distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods (Fabry-Perot refractometers or fixed-length optical cavities) are used to measure pressure, then the measurement process is simple, but deformation of optical elements occurs when gas is injected, leading to inaccurate pressure measurement
Solution Approach 1:
The measurement system is segmented into two independent optical cavities: a measurement cavity that experiences gas pressure and deformation, and a reference cavity that remains undeformed. By separating the measurement function from the reference function, the system can compensate for deformation effects while maintaining operational simplicity.
Solution Approach 2:
A reference optical cavity serves as an intermediary element that does not experience gas pressure or deformation. This reference cavity provides a stable baseline for comparison, allowing the system to isolate and measure only the effects of gas refractivity on the measurement cavity while compensating for optical element deformations.
2Measurement precision
If a single wavelength laser is used in the optical cavity, then the device complexity is reduced, but the ability to determine deformation caused by gas pressure is limited
Solution Approach 1:
The measurement system is designed to accommodate multiple wavelength lasers through a universal optical path that includes both the measurement and reference cavities. Each laser wavelength can independently probe the cavities, and the system processes multiple wavelengths through the same optical components, enabling deformation measurement across different spectral regions without requiring separate measurement systems for each wavelength.
Solution Approach 2:
The system utilizes changes in optical parameters (wavelength, refractive index, cavity length) to measure deformation. By introducing multiple wavelength lasers, the system can observe how different wavelengths are affected by gas pressure and optical element deformation, providing multiple data points for accurate deformation determination through comparative analysis.
3Measurement precision
If gas is injected into the optical cavity to enable refractometry, then pressure measurement capability is achieved, but optical elements deform leading to measurement errors
Solution Approach 1:
The reference optical cavity acts as an intermediary that experiences the same environmental conditions (temperature, pressure changes) but does not experience gas-induced deformation. By comparing the measurement cavity (which experiences both gas refractivity effects and deformation) with the reference cavity (which experiences only environmental effects), the system can isolate and accurately determine the refractive index changes while compensating for structural deformations.
Solution Approach 2:
The system applies different local conditions to the two cavities: the measurement cavity is exposed to gas pressure causing both refractivity changes and deformation, while the reference cavity is kept free of gas pressure to maintain structural stability. This localized differentiation allows the system to separate and measure the specific effects of gas refractivity from the effects of deformation.
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 approach provides accurate deformation measurements, overcoming the limitations of conventional methods by accounting for optical cavity distortions and allowing for precise determination of pressure and refractive index, potentially serving as a primary standard for pressure measurement.
Implementation Method 1
an optical cavity that receives the combined light and that produces filtered combined light from the combined light
Implementation Method 2
a beam splitter in optical communication with the exit optical cavity optic and that: receives the filtered combined light from the optical cavity; splits the filtered combined light into first filtered light and second filtered light
Implementation Method 3
a first light detector in optical communication with the beam splitter and that: receives the first filtered light from the beam splitter; and produces a first cavity signal from the first filtered light
Data Source
AI summary
A deformometer includes: a cavity body; entry and exit optical cavity optics, such that the optical cavity produces filtered combined light from combined light; a first laser that provides first light; a second laser that provides second light; an optical combiner that: receives the first light; receives the second light; combines the first light and the second light; produces combined light from the first light and the second light; and communicates the combined light to the entry optical cavity optic; a beam splitter that: receives the filtered combined light; splits the filtered combined light; a first light detector in optical communication with the beam splitter and that: receives the first filtered light from the beam splitter; and produces a first cavity signal from the first filtered light; and a second light detector that: receives the second filtered light; and produces a second cavity signal from the second filtered light.