Densely folded spectral images of the CCD spectrometer working in the full 200-1000nm wavelength range with high resolution

Chen, Yue-Rui; Sun, Bin; Han, Tao; Kong, Yufei; Xu, Conghui; Zhou, Peng; Li, Xiaofan; Wang, Song-You; Zheng, Yuanzhou; Chen, Liang‐Yao

doi:10.1364/opex.13.010049

Cited by 28 publications

(18 citation statements)

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“…wavelengths on the corresponding camera (detector) pixels. In other words, the calibration of a spectrometer can be achieved by assigning the detected spectral peaks of a calibration lamp or a tunable laser using higher-order polynomial curve fitting [5]- [7]; the fitting curve represents the pixel-wavelength matching profile to cover every wavelength in the spectrometer. However, tunable lasers are relatively expensive, require calibration [8], and are limited by the tuning range [9].…”

Section: Introductionmentioning

confidence: 99%

Accurate Wavelength Calibration Method for Spectrometer Using Low Coherence Interferometry

Kim

Han

Jeong

2015

J. Lightwave Technol.

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Dispersive spectrometers are subject to wavelength dispersion errors due to aberration, ruling errors, etc. Thus, their calibration forms an integral aspect of their usage. In this context, we present an interferometric wavelength calibration method for calibrating dispersive spectrometers. The calibration system is based on low coherence interferometry. By analyzing the sinusoidal interference patterns that are modulated in a spectrum, we determine the distribution of wavelengths in a spectrometer using the zero-crossing detection. The spectral sampling interval of the spectrometer is estimated by determining the sampling interval in the z-domain. Assigning only one wavelength to the corresponding camera pixel using a narrowband light source allows the determination of entire wavelengths accurately. We use the information of the wavelength distribution, spectral sampling interval, and wavelength data to achieve accurate calibration. Our experimental results show that the proposed method calibrates wavelengths more accurately than conventional methods since the interferometric calibration can reduce the wavelength fitting error arising from extrapolation. Moreover, the proposed calibration method can reduce the side-lobe amplitude maximally by 4.8 dB when applied to OCT imaging. We believe that our findings can significantly aid in the development of spectrometry. where he is currently a Professor. His current research interests include functional infrared biophotonic spectroscopy, optical coherence tomography, and adaptive optical fiber sensing.

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Section: Introductionmentioning

confidence: 99%

Accurate Wavelength Calibration Method for Spectrometer Using Low Coherence Interferometry

Kim

Han

Jeong

2015

J. Lightwave Technol.

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“…With the development of densely folded spectral images of a charge-coupled device (CCD) spectrometer [34,35], it is possible to obtain the real time spectrum with high accuracy and resolution in the collecting time of CCD without moving of the mechanical devices. [37].…”

Section: Spectroscopic Ellipsometermentioning

confidence: 99%

Ellipsometry and Its Applications in Stoichiometry

Zheng¹,

Zhang²,

Chen³

2012

Stoichiometry and Materials Science - When Numbers Matter

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“…[7][8][9] This method reduces post-processing needs but complicates system design. The other direct calibration methods proposed include a characteristic wavelength method 10 and a spectral interferogram mapping method, 11,12 which are based on directly measuring part of the wavelength distribution on the charge-coupled device (CCD) by standard equipment and then performing polynomial fitting to obtain the wavelength alignment on the whole CCD pixels. The need of external devices such as an external light source with known spectral features or a well-calibrated commercial optical spectrum analyzer (OSA) increases system complicity and cost.…”

Section: Introductionmentioning

confidence: 99%

Self-spectral calibration for spectral domain optical coherence tomography

et al. 2013

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Abstract. A different real-time self-wavelength calibration method for spectral domain optical coherence tomography is presented in which interference spectra measured from two arbitrary points on the tissue surface are used for calibration. The method takes advantages of two favorable conditions of optical coherence tomography (OCT) signal. First, the signal back-scattered from the tissue surface is generally much stronger than that from positions in the tissue interior, so the spectral component of the surface interference could be extracted from the measured spectrum. Second, the tissue surface is not a plane and a phase difference exists between the light reflected from two different points on the surface. Compared with the zero-crossing automatic method, the introduced method has the advantage of removing the error due to dispersion mismatch or the common phase error. The method is tested experimentally to demonstrate the improved signal-to-noise ratio, higher axial resolution, and slower sensitivity degradation with depth when compared to the use of the zero-crossing method and applied to two-dimensional cross-sectional images of human finger skin.

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Densely folded spectral images of the CCD spectrometer working in the full 200-1000nm wavelength range with high resolution

Cited by 28 publications

References 0 publications

Accurate Wavelength Calibration Method for Spectrometer Using Low Coherence Interferometry

Accurate Wavelength Calibration Method for Spectrometer Using Low Coherence Interferometry

Ellipsometry and Its Applications in Stoichiometry

Self-spectral calibration for spectral domain optical coherence tomography

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