Optical Comb Measurement With Segmented Bands for Multiple Targets
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Solution Overview
Problem
Dual-comb spectroscopy measurements require an increased time to measure multiple types of measuring targets with significantly different optical frequencies due to the need to reduce the difference between the repetition frequencies of the signal and local combs.
Innovation Solution
An optical comb measuring apparatus that acquires an interference signal between a post-irradiation signal comb and a local comb with a predetermined differential frequency, and measures the frequency spectrum using a frequency spectrum measuring section, where the combs have varying power at specific frequencies corresponding to the measuring targets, with non-overlapping frequency bands for each target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the difference between the repetition frequency of the signal comb and the repetition frequency of the local comb is reduced to increase the measurable band, then the measurable band is increased, but the time required for measurement is increased
Solution Approach 1:
The patent divides the measurable band into multiple separate bands, each containing specific predetermined frequencies corresponding to different measuring targets. By segmenting the frequency range rather than using a single continuous band, the system can measure multiple targets with significantly different optical frequencies simultaneously without requiring a uniformly wide measurable band, thus avoiding the need to reduce the repetition frequency difference and shorten measurement time.
Solution Approach 2:
Each measurable band is designed to have specific local characteristics - containing only the predetermined frequencies corresponding to particular measuring targets. This local quality approach allows each band to be optimized for specific measurement needs while maintaining overall system efficiency, enabling simultaneous measurement of multiple targets without requiring the entire measurable band to accommodate all frequencies.
2Adaptability or versatility
If multiple types of measuring targets with significantly different optical frequencies are measured simultaneously, then the versatility of the measurement system is improved, but the complexity of frequency band management increases
Solution Approach 1:
The frequency spectrum is segmented into multiple discrete measurable bands, each associated with specific predetermined frequencies corresponding to different measuring targets. This segmentation simplifies frequency band management by creating clear, non-overlapping frequency regions rather than requiring continuous monitoring of a wide spectrum, making it easier to distinguish and measure multiple targets simultaneously.
Solution Approach 2:
The patent introduces predetermined frequencies as intermediary markers that define the measurable bands. These predetermined frequencies act as mediators between the optical comb and the detection system, providing reference points that simplify the management of multiple frequency bands and enable reliable identification of different measuring targets without complex frequency analysis.
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 allows for the simultaneous measurement of multiple types of targets without increasing the time required, by ensuring each measurable band includes only the necessary frequencies, reducing the need to adjust the repetition frequency difference, and preventing aliasing.
Implementation Method 1
a power of light with which the irradiation target is irradiated varies at predetermined frequencies corresponding to the respective measuring targets
Implementation Method 2
an interference signal between a post-irradiation signal comb obtained by irradiating the irradiation target with a pre-irradiation signal comb and a local comb
Implementation Method 3
the interferogram undergoes a Fourier transform, whereby the optical spectrum of the irradiation target is measured
Data Source
AI summary
An optical comb measuring apparatus that measures an irradiation target having multiple types of measuring targets, includes: an interference signal acquiring section; and a frequency spectrum measuring section. The interference signal acquiring section acquires an interference signal between a post-irradiation signal comb obtained by irradiating the irradiation target with a pre-irradiation signal comb and a local comb set to be different from a repetition frequency of the pre-irradiation signal comb by a predetermined differential frequency. The frequency spectrum measuring section measures a frequency spectrum of a result of acquisition by the interference signal acquiring section. Either one or both of the post-irradiation signal comb and the local comb provided to the interference signal acquiring section have only components within a plurality of required bands including all of predetermined frequencies. Frequency bands of the interference signal corresponding to the plurality of respective required bands have no areas overlapping each other.