Spectroscopic Camera Wavelength Variation Correction
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Solution Overview
Problem
Existing spectroscopic measurement devices face challenges in achieving rapid and accurate measurements due to in-plane wavelength variations caused by warping or inclination of reflective films in interference filters, leading to longer measurement times and increased complexity in controlling the spectroscopic element.
Innovation Solution
A measurement device with a spectroscopic element that disperses light and an image capturing element, where the optical association value for a target wavelength is predicted based on the light reception central wavelength, allowing for interpolation to simplify the measurement process and reduce the need for precise control of the spectroscopic element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If light is surface dispersed by a spectroscopic element (interference filter) to enable compact device design, then device size is reduced and manufacturing cost is lowered, but in-plane wavelength variations occur due to reflective film warping or inclination, degrading measurement accuracy
Solution Approach 1:
The patent changes the parameter of wavelength association from position-based (which causes errors due to film warping) to optical property-based (using light reception central wavelength and optical association values). By predicting optical association values based on optical properties rather than fixed positional relationships, the system achieves accurate spectroscopic measurements despite in-plane wavelength variations caused by reflective film imperfections.
2Measurement precision
If multiple measurements are performed by switching gap dimension between reflective films to receive target wavelength at each pixel, then in-plane wavelength variations are suppressed, but measurement time increases significantly
Solution Approach 1:
The patent performs preliminary measurements to acquire optical association values for multiple wavelengths in advance. These pre-acquired values are then used to predict the optical association value at the target wavelength through interpolation, eliminating the need for time-consuming repeated gap switching measurements for each pixel. This preliminary action approach significantly reduces measurement time while maintaining accuracy.
Solution Approach 2:
The patent creates a correlation between light reception central wavelength and optical association value based on preliminary measurements. This correlation data serves as a reference model that can be used to predict optical association values for target wavelengths without performing full measurements again, effectively copying the relationship pattern to accelerate subsequent measurements.
3Measurement precision
If correlation data is stored for each voltage applied to gap alteration section to specify received wavelength, then wavelength accuracy is improved, but device complexity and data management burden increase
Solution Approach 1:
The patent changes the correlation parameter from voltage-to-wavelength (which requires storing data for each voltage step) to light reception central wavelength-to-optical association value. This parameter transformation simplifies data management because the correlation is established based on directly measurable optical properties rather than control parameters, reducing the complexity of data storage and retrieval operations.
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 enables rapid and accurate spectroscopic imaging by predicting optical association values, reducing measurement time and complexity, while maintaining high accuracy and simplifying the device configuration.
Implementation Method 1
a spectroscopic element that disperses light of a predetermined wavelength among incidence light
Implementation Method 2
in an interference filter in which a pair of reflective films are disposed facing one another
Data Source
AI summary
A spectroscopic camera includes a wavelength variable interference filter, and an image sensor that receives light which is transmitted through the wavelength variable interference filter. Measurement is implemented a plurality of times by causing measurement light to be incident to the wavelength variable interference filter and changing the wavelength of light that is transmitted by the wavelength variable interference filter. Reflectance based on the intensity of light when a first pixel of the image sensor receives light of a target wavelength, is predicted in the respective plurality of repetitions of measurement on the basis of a light reception central wavelength of light that the first pixel receives, and reflectance that is calculated on the basis of the intensity of light that is received by the first pixel.