A measurement method in near infrared spectroscopy for reference correction with the homologous optical beams

Wang, Z.H.; Sun, Peng; Wang, Y.Z.; Wei, Tingting; Liu, J.

doi:10.1088/1748-0221/16/10/p10019

Cited by 3 publications

(3 citation statements)

References 22 publications

(22 reference statements)

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“…An innovative NIR spectrometer for reference correction was consequently developed. According to the experimental results, the stability of the newly designed spectrometer achieved substantial improvement ( Wang et al, 2021 ).…”

Section: Portable Nir Spectrometersmentioning

confidence: 99%

Portable NIR spectroscopy: the route to green analytical chemistry

Gullifa,

Barone,

Papa

et al. 2023

Front. Chem.

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There is a growing interest for cost-effective and nondestructive analytical techniques in both research and application fields. The growing approach by near-infrared spectroscopy (NIRs) pushes to develop handheld devices devoted to be easily applied for in situ determinations. Consequently, portable NIR spectrometers actually result definitively recognized as powerful instruments, able to perform nondestructive, online, or in situ analyses, and useful tools characterized by increasingly smaller size, lower cost, higher robustness, easy-to-use by operator, portable and with ergonomic profile. Chemometrics play a fundamental role to obtain useful and meaningful results from NIR spectra. In this review, portable NIRs applications, published in the period 2019–2022, have been selected to indicate starting references. These publications have been chosen among the many examples of the most recent applications to demonstrate the potential of this analytical approach which, not having the need for extraction processes or any other pre-treatment of the sample under examination, can be considered the “true green analytical chemistry” which allows the analysis where the sample to be characterized is located. In the case of industrial processes or plant or animal samples, it is even possible to follow the variation or evolution of fundamental parameters over time. Publications of specific applications in this field continuously appear in the literature, often in unfamiliar journal or in dedicated special issues. This review aims to give starting references, sometimes not easy to be found.

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Section: Portable Nir Spectrometersmentioning

confidence: 99%

Portable NIR spectroscopy: the route to green analytical chemistry

Gullifa,

Barone,

Papa

et al. 2023

Front. Chem.

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“…A multichannel combined acquisition demodulation system was developed for grating scanning spectrometers with reference optical path [16] in order to implement the digital demodulation method based on multichannel combined acquisition . The principle diagram of the spectrometer is depicted in figure 2.…”

Section: Development Of Instrumentmentioning

confidence: 99%

“…The multichannel combined acquisition demodulation system converts analog modulated signals to digital signals, 𝐷 and 𝐷'. Finally, the amplitudes, 𝐴 and 𝐴 of the sampling modulated signal and the reference modulated signal are obtained by the proposed demodulation method, and the ratio of the 𝐴 and 𝐴 is taken as the demodulation result, 𝑑𝑟 [16].…”

Section: Development Of Instrumentmentioning

confidence: 99%

Digital demodulation method based on multichannel combined acquisition for near-infrared spectrometer

Wang¹,

Sun²,

Wang³

et al. 2022

J. Inst.

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With the evolution of digital technology, the digital demodulation method has become widely employed in near-infrared (NIR) spectrometers due to its advantages of reducing the volume, enhancing the reliability, and increasing the flexibility of instruments. However, digital demodulation has a lower signal-to-noise ratio (SNR), which can be improved by lowering the measurement precision, speed, and stability. To improve the SNR without sacrificing the measurement speed or stability, an improved digital demodulation method was developed based on multichannel combined acquisition. To validate the proposed method, a multichannel combined acquisition digital lock-in amplifier demodulation system was designed for portable raster scanning NIR spectrometers. In this system, six ADC channels were used in conjunction to acquire the modulated sampling signal. Afterwards, comparative experiments were conducted to compare the conventional and novel methods. The experimental results revealed that the SNR increased from 2499 to 3007 with a measurement time of 16.75 s and 17.08 s, respectively. Furthermore, scanning the reference reflector resulted in a baseline drift of 0.064% and 0.060% with a scanning time of 128.27 s and 128.21 s. Scanning the kaolin sample resulted in a baseline drift of 0.27% and 0.23% with a scanning time of 128.44 s and 128.53 s. In brief, the multichannel combined acquisition method can improve the SNR of spectrometers without compromising their stability or measurement time.

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Error correction for Mueller matrix ellipsometry based on a reference optical path

Qi¹,

Xue²,

Zhang³

et al. 2022

Appl. Opt.

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To reduce the error induced by light source fluctuations, motor rotation instability, environment, and other factors in real-time measurements using dual-rotating compensator Mueller matrix ellipsometry (DRC-MME), an error-correction method based on a reference optical path is proposed. A modified Mueller matrix expression was derived theoretically by introducing the reference optical path of the DRC-MME system. Simulation analysis and experimental verification of the air, polarizer, and S i O 2 samples were performed using this method. The absolute error of the Mueller matrix elements of the S i O 2 samples decreased from less than 0.028 to less than 0.008, and the standard deviation decreased from 0.9% to 0.3%. This method has certain guiding significance in improving the measurement accuracy of DRC-MME.

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A measurement method in near infrared spectroscopy for reference correction with the homologous optical beams

Cited by 3 publications

References 22 publications

Portable NIR spectroscopy: the route to green analytical chemistry

Portable NIR spectroscopy: the route to green analytical chemistry

Digital demodulation method based on multichannel combined acquisition for near-infrared spectrometer

Error correction for Mueller matrix ellipsometry based on a reference optical path

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