Tunable Interference Filter with Support Protrusions
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Solution Overview
Problem
Existing light measurement devices with tunable interference filters face challenges in accurately measuring light wavelengths due to non-uniform gap dimensions between reflection coatings, leading to reduced resolution and inconsistent light detection across imaging sensors.
Innovation Solution
A light measurement device with a tunable interference filter featuring a movable section and a holding section, where the gap between reflection coatings is adjusted using electrostatic attraction or air pressure, and a control system that identifies the appropriate detecting element for the measured wavelength based on correlation data, ensuring accurate light intensity measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the movable section is bent by electrostatic attraction to change the gap between reflection coatings, then the gap dimension can be adjusted to extract different wavelengths, but the movable section bends slightly causing non-uniform gap dimensions and reduced measurement precision
Solution Approach 1:
A support structure is introduced as an intermediary between the movable section and the diaphragm to prevent bending. The support structure includes support protrusions that extend from the movable section toward the other substrate and are positioned outside the gap region, providing mechanical support that prevents the movable section from bending when electrostatic force is applied, thereby maintaining uniform gap dimensions across the entire gap region.
Solution Approach 2:
The movable section is constructed as a composite structure combining the diaphragm, reflection coating, and support protrusions. This composite design allows the movable section to maintain its flatness while still being actuated by electrostatic force, as the support protrusions provide structural reinforcement that prevents bending of the diaphragm and reflection coating assembly.
2Ease of operation
If the movable section is held by a diaphragm to enable movement, then the gap can be changed for wavelength extraction, but the diaphragm bending causes the reflection coating to bend and creates non-uniform gaps
Solution Approach 1:
The support protrusions act as intermediary structural elements that decouple the bending function of the diaphragm from the gap-forming function of the movable section. By positioning the support protrusions outside the gap region, they provide mechanical support that prevents the transmission of bending stresses to the gap region, thereby maintaining gap uniformity while still allowing diaphragm-based actuation.
3Loss of information
If multiple imaging devices are used to detect light, then light intensity distribution can be measured, but non-uniform gaps cause different wavelengths to enter different imaging devices making accurate measurement impossible
Solution Approach 1:
The support protrusions serve as structural intermediaries that ensure uniform gap dimensions across the entire gap region, which in turn ensures that each imaging device receives light at the intended wavelength. This structural support prevents the bending that would otherwise cause wavelength mixing and enables accurate wavelength-specific measurements by each imaging device.
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 device achieves precise measurement of light wavelengths by maintaining uniform gap intervals and reducing data complexity, enabling swift and accurate light intensity distribution analysis across the detecting elements.
Implementation Method 1
the movable section is moved by electrostatic attraction
Implementation Method 2
a tunable interference filter that transmits a light of an incident light, the light intensified by multiple interference
Data Source
AI summary
A light measurement device comprising an optical sensor that includes a tunable interference filter and a detecting section detecting light passed through the tunable filter, a storing section that stores a first correlation data and a second correlation data, and a CPU that obtains amount of the light by controlling the optical sensor based on the first correlation data and a second correlation data.