Membrane Wave Detection Without Reference Reflector
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Solution Overview
Problem
Existing methods for detecting waves on membranes, such as in eye pressure measurements, require a stationary reference reflector, which can be challenging to maintain, especially in applications like eye pressure measurements where movement or orientation changes can disrupt the measurement.
Innovation Solution
A system and method that direct a signal obliquely to a membrane, measuring interference between reflections from the front and rear surfaces, allowing wave detection without the need for a stationary reference reflector, using a source, receiver, and processing device to analyze changes in the interference pattern within the membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interferometry with a reference reflector is used to detect waves on a membrane, then wave detection capability is achieved, but the system requires a stationary reference reflector which is difficult to maintain in applications like eye pressure measurements
Solution Approach 1:
The invention extracts and eliminates the reference reflector component from the interferometry system. Instead of using a separate reference reflector that must be kept stationary, the system uses the membrane's own rear surface as the reflection point, thereby removing the positioning stability requirement while maintaining wave detection capability
Solution Approach 2:
The membrane itself serves as both the object being measured and the reference for interference measurement. The rear surface of the membrane provides the reflection necessary for interferometry without requiring an external reference reflector, making the system self-sufficient and eliminating the need for precise external reference positioning
2Measurement precision
If a reference reflector is used in wave detection, then interference measurement can be performed, but the system complexity increases due to the need for additional stationary components
Solution Approach 1:
The reference reflector component is extracted and removed from the system. The invention achieves interference measurement using only the membrane structure itself, thereby reducing device complexity by eliminating additional stationary components while preserving measurement precision
Solution Approach 2:
The function of the reference reflector is merged with the membrane's rear surface. Instead of having separate measurement and reference components, the system combines these functions into a single integrated structure, simplifying the overall device architecture
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
Enables accurate wave detection on membranes without the need for a stationary reference reflector, improving measurement stability and reliability by focusing on interference changes within the membrane's V-shaped propagation path.
Implementation Method 1
measuring interference between a first part of the signal reflected off a front surface of the membrane and a second part of the signal reflected off a rear surface of the membrane
Implementation Method 2
a first part of the signal reflected off a front surface of the membrane and a second part of the signal reflected off a rear surface of the membrane
Data Source
AI summary
A system for detecting a wave occurring in/on a membrane includes a source for directing an excitation signal obliquely to the membrane and a receiver for measuring interference between a first part of the excitation signal reflected off a front surface of the membrane and a second part of the excitation signal reflected off a rear surface of the membrane. The system includes a processing device for detecting the wave based on a change in the measured interference. The detection of the wave is based on changes caused by the wave in the optical length of a V-shaped part of a propagation path of the second part of the excitation signal, where the V-shaped part of the propagation path is inside the membrane.