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Updated: Jan 27, 2026

TD-DFT Guided Advanced E-Eye Sensing Technique for On-site Quantification of Fe, Cr, F, and As in the Environmental, Biological, and Food Samples
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Two-color phase-stable dual-comb ranging without precise environmental sensing.

Zebin Zhu, Kai Ni, Qian Zhou

    Optics Express
    |March 17, 2019
    PubMed
    Summary
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    A new two-color dual-comb ranging (DCR) method precisely measures long distances in open air. This technique eliminates the need for environmental sensors, offering high accuracy for applications like advanced manufacturing and LIDAR.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Laser Technology

    Background:

    • High-precision long geometrical distance measurement is crucial for large-scale manufacturing and Light Detection and Ranging (LIDAR).
    • Dual-comb ranging (DCR) offers high precision, fast rates, and large ambiguity range for absolute distance measurement.
    • Conventional DCR is affected by air's refractive index, requiring complex environmental sensing for compensation, which is difficult for long distances.

    Purpose of the Study:

    • To develop a novel two-color compensation method for dual-comb ranging (DCR) to overcome limitations of environmental sensing.
    • To combine the two-color method with a low-noise DCR system for improved long-distance measurement accuracy.
    • To demonstrate the feasibility and performance of the proposed two-color DCR (TC-DCR) in open-air conditions.

    Main Methods:

    • Implementation of a two-color compensation strategy using two co-propagating lights at different wavelengths.
    • Integration of a digital correction method to achieve low-noise and phase-stable dual-comb spectra.
    • Utilizing mode-resolved comb spectra for ranging at two distinct wavelengths with a ~200 THz difference.

    Main Results:

    • Achieved 46 nm precision and a 2.7 m ambiguity range using TC-DCR with 0.1 s coherent averaging.
    • Demonstrated precision on the order of ~10-8 and accuracy on the order of ~10-7.
    • Results are comparable to single-color DCR using empirical equations with environmental sensing.

    Conclusions:

    • The proposed two-color DCR method effectively compensates for air refractive index variations without environmental sensors.
    • TC-DCR provides high precision and accuracy suitable for long-distance measurements in open environments.
    • This technique holds significant potential for advancing applications in large-scale manufacturing and future LIDAR systems.