Optical Displacement Sensor Using Wavelength Distribution
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Solution Overview
Problem
Existing displacement measurement systems face challenges in accurately measuring minute displacements and pressures due to complexity in electrode arrangements and difficulty in evaluating pressure measurements in small regions.
Innovation Solution
A displacement measurement system utilizing a sensor with a first spacer and two types of light emitting particles that emit light at different wavelengths, an excitation energy source, and a light receiver to measure displacement based on wavelength distribution, allowing for precise detection of minute displacements and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of thin film transistors are arranged in a matrix to measure pressure, then the pressure measurement capability is improved, but the device complexity and difficulty in evaluating small region measurements increase
Solution Approach 1:
The patent replaces the mechanical/electrical measurement system (thin film transistors and electrodes) with an optical measurement system using light-emitting particles. The sensor contains first and second light-emitting particles that emit light at different wavelengths when excited. By measuring the wavelength distribution of the emitted light, pressure and displacement can be detected without complex electrode arrangements, thus resolving the contradiction between measurement capability and device complexity.
2Area of stationary object
If individual electrodes with different gaps are arranged in a matrix to widen pressure measurement range, then the measurement area is increased, but the device complexity and difficulty in measuring minute regions increase
Solution Approach 1:
The patent replaces the complex matrix electrode arrangement with a simplified optical sensor structure. The sensor contains light-emitting particles distributed within a transparent resin layer, eliminating the need for multiple electrodes with different gaps. The optical measurement approach allows the entire sensor area to be used for pressure measurement, simplifying the device structure while maintaining large measurement area capability.
Solution Approach 2:
The patent changes the measurement parameter from electrical signals (requiring multiple electrodes) to optical wavelength distribution. By using light-emitting particles with different emission wavelengths and analyzing the wavelength distribution of emitted light, the system achieves pressure measurement across the entire sensor area without requiring complex electrode patterns, thus resolving the contradiction between measurement area and device complexity.
3Device complexity
If traditional pressure-sensitive resin with conductive particles is used, then the pressure detection mechanism is simple, but the ability to measure minute displacements is insufficient
Solution Approach 1:
The patent changes the detection parameter from electrical resistance (used in traditional pressure-sensitive resin) to optical wavelength distribution. The sensor contains light-emitting particles whose emission wavelength shifts in response to pressure-induced changes in the transparent resin layer. This optical parameter change enables detection of minute displacements while maintaining system simplicity, as the basic sensor structure remains straightforward but the measurement precision is significantly improved.
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 easy evaluation of displacement and pressure measurements in minute regions, effectively addressing the limitations of existing systems by using light emitting particles and wavelength analysis for precise detection.
Implementation Method 1
two types of light emitting particles that are distributed over the spread of the first spacer and emit light at different wavelengths by an excitation energy
Data Source
AI summary
Provided is a displacement measurement system including: a sensor that is contactable with a measurement target object and includes a first spacer that has at least a one-dimensional spread, and two or more types of light emitting particles that are distributed over the spread of the first spacer and emit light at different wavelengths by an excitation energy; an excitation energy source that causes the two or more types of light emitting particles included in the sensor to emit light; and a light receiver that receives light emitted from the sensor.