Fabry-Perot Filter Temperature Correction via Overlapping Detector
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Solution Overview
Problem
In light detection devices using Fabry-Perot interference filters, temperature changes cause variations in the distance between mirror parts, leading to deviations in the transmitted light wavelength from a target wavelength, necessitating accurate correction of temperature characteristics.
Innovation Solution
The light detection device incorporates a temperature detector positioned to overlap with the Fabry-Perot interference filter and its support parts, allowing for precise temperature measurement and correction, ensuring accurate reflection of the filter's temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature detector is positioned to overlap with the Fabry-Perot interference filter, then the temperature measurement accuracy is improved, but the thermal connection area between the filter and support part is reduced
Solution Approach 1:
The temperature detector is positioned in the optical path direction (first direction perpendicular to mounting surface) to overlap with the Fabry-Perot interference filter, while the thermal connection is maintained through the support part in a different spatial dimension. This dimensional separation allows the detector to measure the filter's temperature accurately without compromising the thermal connection area between the filter and support structure.
2Measurement precision
If the distance between the temperature detector and the first support part is reduced, then the temperature measurement accuracy is improved, but the thermal connection region area is reduced
Solution Approach 1:
The temperature detector is positioned closer to the first support part in the optical path direction (first direction), reducing measurement distance and improving accuracy. Meanwhile, the thermal connection region area is preserved by maintaining adequate spacing in the mounting surface plane (second direction), effectively utilizing different spatial dimensions to resolve the contradiction.
3Measurement precision
If the temperature detector is positioned close to the Fabry-Perot interference filter, then the temperature measurement accuracy is improved, but the device complexity increases
Solution Approach 1:
The temperature detector is integrated into the mounting surface structure, sharing the same substrate as other components like the light detector and support parts. This merging approach allows the temperature detector to be positioned close to the Fabry-Perot interference filter for accurate measurement while avoiding additional complex mounting structures, thereby reducing overall device complexity.
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 configuration enables highly accurate correction of the Fabry-Perot interference filter's temperature characteristics, maintaining the target wavelength and improving the device's precision.
Implementation Method 1
A light detection device including a Fabry-Perot interference filter that has a first mirror part and a second mirror part between which a distance is variable
Implementation Method 2
a temperature detector disposed on the mounting surface... such that at least a part of the temperature detector overlaps a part of the Fabry-Perot interference filter
Data Source
AI summary
A light detection device of the present invention includes: a wiring board; a first support part disposed on a mounting surface of the wiring board; a Fabry-Perot interference filter having a first mirror part and a second mirror part between which a distance is variable and having an outer edge portion disposed in a first support region of the first support part; a light detector disposed on the mounting surface to face the first mirror part and the second mirror part on one side of the first support part; and a temperature detector disposed on the mounting surface, wherein the temperature detector is disposed on the mounting surface such that at least a part of the temperature detector overlaps a part of the Fabry-Perot interference filter when seen in a first direction perpendicular to the mounting surface and such that at least a part of the temperature detector overlaps a part of the first support part when seen in a second direction in which the first support part and the light detector are aligned with each other, and wherein a first distance between the temperature detector and the first support part in the second direction is smaller than a first width of the first support region in the second direction.