Toward Confocal Chromatic Sensing in Nuclear Reactors: <i>In Situ</i> Optical Refractive Index Measurements of Bulk Glass

Agoyan, Marion; Fourneau, Gary; Cheymol, G.; Ladaci, Ayoub; Maskrot, Hicham; Destouches, C.; Fourmentel, D.; Girard, Sylvain; Boukenter, Aziz

doi:10.1109/tns.2022.3150221

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…Spectral confocal displacement sensors are being increasingly utilized in many industries, such as aerospace, microelectronics production, and biomedical domains, due to their advantageous features, including non-contact operation, small focus, high precision, and flexible integration [7][8][9][10]. They have become a powerful instrument for detecting threedimensional morphology, indicating the emerging trend in three-dimensional morphology measuring sensors.…”

Section: Introductionmentioning

confidence: 99%

Design of Optical System for Ultra-Large Range Line-Sweep Spectral Confocal Displacement Sensor

Yang,

Du,

et al. 2024

Sensors

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The spectrum confocal displacement sensor is an innovative type of photoelectric sensor. The non-contact advantages of this method include the capacity to obtain highly accurate measurements without inflicting any harm as well as the ability to determine the object’s surface contour recovery by reconstructing the measurement data. Consequently, it has been widely used in the field of three-dimensional topographic measuring. The spectral confocal displacement sensor consists of a light source, a dispersive objective, and an imaging spectrometer. The scanning mode can be categorized into point scanning and line scanning. Point scanning is inherently present when the scanning efficiency is low, resulting in a slower measurement speed. Further improvements are necessary in the research on the line-scanning type. It is crucial to expand the measurement range of existing studies to overcome the limitations encountered during the detection process. The objective of this study is to overcome the constraints of the existing line-swept spectral confocal displacement sensor’s limited measuring range and lack of theoretical foundation for the entire system. This is accomplished by suggesting an appropriate approach for creating the optical design of the dispersive objective lens in the line-swept spectral confocal displacement sensor. Additionally, prism-grating beam splitting is employed to simulate and analyze the imaging spectrometer’s back end. The combination of a prism and a grating eliminates the spectral line bending that occurs in the imaging spectrometer. The results indicate that a complete optical pathway for the line-scanning spectral confocal displacement sensor has been built, achieving an axial resolution of 0.8 μm, a scanning line length of 24 mm, and a dispersion range of 3.9 mm. This sensor significantly expands the range of measurements and fills a previously unaddressed gap in the field of analyzing the current stage of line-scanning spectral confocal displacement sensors. This is a groundbreaking achievement for both the sensor itself and the field it operates in. The line-scanning spectral confocal displacement sensor’s design addresses a previously unmet need in systematic analysis by successfully obtaining a wide measuring range. This provides systematic theoretical backing for the advancement of the sensor, which has potential applications in the industrial detection of various ranges and complicated objects.

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Section: Introductionmentioning

confidence: 99%

Design of Optical System for Ultra-Large Range Line-Sweep Spectral Confocal Displacement Sensor

Yang,

Du,

et al. 2024

Sensors

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“…This greatly improves measurement efficiency while maintaining high resolution [1]. Therefore, CCM has a promising application in realtime scanning [2], industrial rapid inspection [3,4], noncontact measurement [5][6][7] and other scenarios with high requirements for measurement efficiency and precision.…”

Section: Introductionmentioning

confidence: 99%

Enhancing precision of chromatic confocal measurement through linear interpolation based centroid algorithm

Lu,

Dai,

Zeng

et al. 2024

Surf. Topogr.: Metrol. Prop.

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In chromatic confocal measurement (CCM), the accuracy and precision of the results rely on the robustness of the spectral power distribution (SPD) signal resolution. However, traditional centroid algorithms struggle with the inherent discretization of the SPD signal, leading to significant measurement errors. To address this issue, a linear interpolation based centroid algorithm is proposed to improve the robustness of the results. In the precision calibration experiment conducted with the in-house developed chromatic confocal sensors, the proposed algorithm demonstrates good robustness. Moreover, it achieves a 50% enhancement in the accuracy of a 4 mm range, improving from 1µm to 0.5µm.

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Enhancing precision in line-scan chromatic confocal sensors through bimodal signal pattern

Dai,

Zhong,

Zeng

et al. 2025

Optics & Laser Technology

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Toward Confocal Chromatic Sensing in Nuclear Reactors: In Situ Optical Refractive Index Measurements of Bulk Glass

Cited by 5 publications

References 26 publications

Design of Optical System for Ultra-Large Range Line-Sweep Spectral Confocal Displacement Sensor

Design of Optical System for Ultra-Large Range Line-Sweep Spectral Confocal Displacement Sensor

Enhancing precision of chromatic confocal measurement through linear interpolation based centroid algorithm

Enhancing precision in line-scan chromatic confocal sensors through bimodal signal pattern

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