Spectroscope Aperture Spot Shifting for Wider Dynamic Range
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Solution Overview
Problem
Conventional multipath spectroscopes face challenges in achieving a sharp measurement spectrum with a wide dynamic range due to stray light interference and misalignment of optical components, which reduces the sharpness and intensity of the measurement spectrum.
Innovation Solution
A measurement apparatus and method that synthesizes spectra measured at different positions within the aperture of an optical element, shifting the beam spot to one and the other side of a reference position to improve the dynamic range by synthesizing spectra with lower intensity and reducing local peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the beam spot is positioned at the reference position within the aperture, then the measurement process is simple, but the dynamic range is limited and local peaks appear in the spectrum
Solution Approach 1:
The measurement process is divided into multiple independent spectral measurements at different beam spot positions (first position, second position, and reference position). Each position provides complementary spectral information that, when synthesized, creates a complete high-precision spectrum with extended dynamic range while eliminating local peaks.
Solution Approach 2:
Multiple spectra obtained from different beam spot positions are synthesized by combining their intensity values. This merging process integrates the advantages of each position measurement to produce a final spectrum that exceeds the capabilities of any single position measurement alone.
2Measurement precision
If spectra are synthesized from multiple beam spot positions, then the dynamic range and sharpness improve, but the measurement process becomes more complex
Solution Approach 1:
The beam spot position is systematically varied through a predetermined sequence (first position, second position, reference position) to acquire multiple spectra. This periodic positioning approach ensures comprehensive coverage of the aperture while maintaining a structured, repeatable measurement process that manages complexity through regularity.
Solution Approach 2:
The controller automatically synthesizes the multiple measured spectra and generates the final high-precision spectrum. This feedback mechanism processes the raw spectral data from different positions and delivers the refined result, reducing the perceived complexity for the user while maintaining measurement precision.
3Measurement precision
If the beam spot position is varied to reduce local peaks, then spectral accuracy improves, but the measurement time increases
Solution Approach 1:
The beam spot positions and measurement sequence are predetermined before the actual spectral measurement begins. This preliminary planning optimizes the measurement path and ensures that the minimum necessary number of positions are measured to achieve the desired spectral accuracy, reducing unnecessary measurement time.
Solution Approach 2:
The beam spot position parameter is systematically changed across predetermined locations within the aperture. By optimizing which positions are measured and how the spectra are synthesized, the system achieves high spectral accuracy while minimizing the total measurement time through efficient parameter utilization.
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 apparatus generates a sharp synthetic spectrum with a wide dynamic range by minimizing stray light interference and maintaining peak intensity, allowing for accurate and precise measurement data acquisition.
Implementation Method 1
multipath spectroscopes in which light to be measured is incident on a diffraction grating multiple times
Data Source
AI summary
A measurement apparatus 1 according to this disclosure includes a controller 80 and a spectroscope 10 having an optical element in which an aperture 132a to pass light L1 to be measured is formed. The controller 80 executes a first process to generate a synthetic spectrum Sr(i) of the narrowed light L1 by synthesizing at least a first spectrum S1(i) when a beam spot P of the light L1 is at a first position x1 within the aperture 132a and a second spectrum S2(i) when the beam spot P of the light L1 is at a second position x2 within the aperture 132a. The first position x1 includes a position shifted to one side in a predetermined direction D from a reference position x0 of the beam spot P within the aperture 132a. The second position x2 includes a position shifted to the other side from the reference position x0.