Field-dependent wavelength drift compensation in Fabry-Perot solar imaging spectrometers

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A novel compensation method utilizing a voltage-to-slope response model effectively corrects field-dependent wavelength drift in telecentric Fabry-Perot interferometers, reducing maximum wavelength shifts from 0.14 Å to 0.05 Å and revealing previously obscured solar velocity signals. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Lin Ma; Kaifan Ji; Zhenyu Jin; Liang Chang; Jin Zhu

doi:10.1051/0004-6361/202558573/pdf

March 13, 2026

Field-dependent wavelength drift compensation in Fabry-Perot solar imaging spectrometers

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Key Points

The aim is to develop a method for compensating field-dependent wavelength drift in Fabry-Perot interferometers used in solar imaging.
Developed a compensation method for wavelength drift in telecentric air-gapped FPIs.
Extracted relative wavelength shifts using a cross-correlation algorithm and centroid localization.
Constructed a response model linking actuator offset voltages to linear drift slopes.
Characterized the remaining nonlinear components as intrinsic instrument bias.
Applied the method to the Visible-light Imaging Spectrometer at Yunnan Observatories.
Achieved R^2 = 0.998 and RMSE ≤ 0.007 for voltage-to-slope response model, indicating high calibration accuracy.
Reduced maximum wavelength shift from 0.14 Å to 0.05 Å, enhancing wavelength response homogeneity.
Improved measurement accuracy revealed obscured solar velocity signals.
Demonstrated excellent agreement with laser scanning technique results.

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Presents a method for compensating wavelength drift in solar imaging spectrometers, improving diagnostics accuracy.

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Ma et al. (2026) studied this question.

synapsesocial.com/papers/69c37bc2b34aaaeb1a67e6c2 https://doi.org/10.1051/0004-6361/202558573/pdf

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Field-dependent wavelength drift compensation in Fabry-Perot solar imaging spectrometers

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No abstract yet

Implication

Discussion

Cite This Study

Field-dependent wavelength drift compensation in Fabry-Perot solar imaging spectrometers

Key Points

No abstract yet

Implication

Discussion

Cite This Study

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