scholarly journals The Improvement on the Performance of DMD Hadamard Transform Near-Infrared Spectrometer by Double Filter Strategy and a New Hadamard Mask

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 149 ◽  
Author(s):  
Zifeng Lu ◽  
Jinghang Zhang ◽  
Hua Liu ◽  
Jialin Xu ◽  
Jinhuan Li
Keyword(s):  
Near Infrared ◽  
Signal To Noise Ratio ◽  
Nonuniform Distribution ◽  
Stray Light ◽  
Spectral Energy ◽  
Hadamard Transform ◽  
Digital Micromirror Device ◽  
Infrared Spectrometer ◽  
Near Infrared Spectrometer ◽  
The Impact

In the Hadamard transform (HT) near-infrared (NIR) spectrometer, there are defects that can create a nonuniform distribution of spectral energy, significantly influencing the absorbance of the whole spectrum, generating stray light, and making the signal-to-noise ratio (SNR) of the spectrum inconsistent. To address this issue and improve the performance of the digital micromirror device (DMD) Hadamard transform near-infrared spectrometer, a split waveband scan mode is proposed to mitigate the impact of the stray light, and a new Hadamard mask of variable-width stripes is put forward to improve the SNR of the spectrometer. The results of the simulations and experiments indicate that by the new scan mode and Hadamard mask, the influence of stray light is restrained and reduced. In addition, the SNR of the spectrometer also is increased.

Miniature Digital Micro-Mirror Device Hadamard Transform Near-Infrared Spectrometer

2015 ◽  
Vol 35 (5) ◽  
pp. 0530003
Author(s):  
王晓朵 Wang Xiaoduo ◽  
刘华 Liu Hua ◽  
党博石 Dang Boshi ◽  
全向前 Quan Xiangqian ◽  
许家林 Xu Jialin ◽  
...  
Keyword(s):  
Near Infrared ◽  
Hadamard Transform ◽  
Infrared Spectrometer ◽  
Near Infrared Spectrometer

Analysis of a Hadamard transform near-infrared spectrometer based on grating light modulator

2008 ◽  
Author(s):  
Wei Wei ◽  
Shanglian Huang ◽  
Yong Zhu ◽  
Ning Wang ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Hadamard Transform ◽  
Light Modulator ◽  
Infrared Spectrometer ◽  
Near Infrared Spectrometer

Determination of the Stray Light Levels in a Dispersive Near-Infrared Spectrometer with Trichloromethane

2000 ◽  
Vol 54 (12) ◽  
pp. 1759-1766 ◽  
Author(s):  
Kenneth W. Busch ◽  
Olusola O. Soyemi ◽  
Dennis Rabbe ◽  
Marianna A. Busch
Keyword(s):  
Near Infrared ◽  
Stray Light ◽  
Light Levels ◽  
Infrared Spectrometer ◽  
Near Infrared Spectrometer

Performance of a near Infrared Spectrometer Equipped with an Autosampling Accessory

2003 ◽  
Vol 11 (2) ◽  
pp. 83-95
Author(s):  
Nathalie Szydlowski-Zanier ◽  
Marc Berger ◽  
François Wahl ◽  
Denis Guillaume
Keyword(s):  
Near Infrared ◽  
Signal To Noise Ratio ◽  
Low Cost ◽  
Cetane Number ◽  
Chemical Properties ◽  
Signal To Noise ◽  
Physico Chemical ◽  
Infrared Spectrometer ◽  
The Stability ◽  
Near Infrared Spectrometer

The performance of a Fourier-transform near infrared (FT-NIR) spectrometer equipped with an autosampling accessory (AutoSamplIR) using disposable vials with uncontrolled pathlength has been compared with the performance of an FT-NIR equipped with a manual vial sampling accessory using a reusable cell with calibrated pathlength. The effect of different parameters such as the signal-to-noise ratio, the stability of the purge and the linearity of absorbance have been evaluated by means of the NIR predictions of two physico-chemical properties of interest for gasoils, i.e the wt% of hydrogen and the cetane number (CN). It has been shown that an FT-NIR with the autosampling accessory can be used advantageously at low cost for quick and precise analyses of small amounts of sample.

Near-IR Multiplex Bandpass Spectrometer Utilizing Liquid Molecular Filters

1995 ◽  
Vol 49 (4) ◽  
pp. 493-498 ◽  
Author(s):  
Andrew Fong ◽  
Gary M. Hieftje
Keyword(s):  
Propylene Glycol ◽  
High Throughput ◽  
Near Infrared ◽  
Signal To Noise Ratio ◽  
High Signal ◽  
Ir Radiation ◽  
Near Ir ◽  
Infrared Spectrometer ◽  
Near Infrared Spectrometer

A simple near-infrared spectrometer is described which uses common liquids as near-IR spectral filters. Each filter substance passes multiple bands of near-IR radiation. This new type of spectrometer offers simplicity, cost advantages, and enhanced throughput. The high throughput is useful for ensuring the high signal-to-noise ratio typically needed for chemometrics. The high throughput also allows the use of longer sample pathlengths. The performance of the spectrometer is demonstrated in the determination of methanol through a 1-cm pathlength of water and in the determination of trace amounts of water in organic solvents such as propylene glycol and dimethyl sulfoxide (DMSO). Best-case detection limits were 0.02% (w/w) methanol in water, 0.0006% water in DMSO, and 0.004% water in propylene glycol.

Near-Infrared Spectroscopy Signal Extraction and Processing Design

2013 ◽  
Vol 404 ◽  
pp. 555-559 ◽  
Author(s):  
Ke Zhao ◽  
Jian Hua Jiang ◽  
Jun Fang Fu ◽  
Jin Bo Xu
Keyword(s):  
Near Infrared ◽  
Experimental Testing ◽  
Signal To Noise Ratio ◽  
High Reliability ◽  
Digital Signal ◽  
Signal Extraction ◽  
Filter Method ◽  
Infrared Spectrometer ◽  
Filtering Function ◽  
Near Infrared Spectrometer

This paper introduces the MSP430 MCU-based near-infrared spectrometer front-end signal extraction and software signal processing design.The system adopts phase locked loop technology to signal phase shift processing. Phase sensitive filtering function achieved by the balance modem AD630.Finally the analog signal is converted to digital signal by AD7715 for the microprocessor processed.Microprocessor receives digital signal, filter processing is performed using a first order lag filter method to determine the point of measurement value.Through the comparison analysis of the experimental testing result, the program has higher signal-to-noise ratio and suppress interference ability, high reliability, good stability,etc.

Research of the Hadamard Multiplex Advantages Using a Programmable Micro-Mirror in a Near-Infrared Spectrometer

2011 ◽  
Vol 483 ◽  
pp. 417-421
Author(s):  
Yuan Jun Guo ◽  
Zhi Yu Wen ◽  
Zhi Hai Zhang ◽  
Wei Wang
Keyword(s):  
Near Infrared ◽  
Luminous Flux ◽  
Hadamard Transform ◽  
Weak Signal ◽  
Signal To Noise ◽  
Theoretic Result ◽  
S Matrix ◽  
Single Detector ◽  
Infrared Spectrometer ◽  
Near Infrared Spectrometer

A programmable micro mirror has been used in a near infrared spectrometer in order to achieve the purpose of signal multiplexing, to solve the problem of low luminous flux when using single slit and to increase the signal-to-noise (SNR) ratio. Use Hadamard Transform (HT) and programmable micro mirror as its encoding mask to detect the whole spectrum with a single detector, research and analyze the enhancement of SNR of the weak signal. First of all, the mask symbol number is fixed as 63-order based on the Hadamard Transform principle, calculate the optimal S-Matrix, and then the encoding mask has been realized by micro mirror. At last, carry out some experimental verifications as well as data analyzing, discuss the alternating spectrum signal which produce an effect on transformational algorithm, bring out the coadded upswing plan. The result shows that: the conflict of resolution and SNR can be well settled with Hadamard multiplex. The SNR can be increased by the factor of 3.5, which is identical with the theoretic result.

Freeform lens collimating spectrum-folded Hadamard transform near-infrared spectrometer

2016 ◽  
Vol 380 ◽  
pp. 161-167 ◽  
Author(s):  
Xiaoduo Wang ◽  
Hua Liu ◽  
Larissa Juschkin ◽  
Yunpeng Li ◽  
Jialin Xu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Hadamard Transform ◽  
Infrared Spectrometer ◽  
Near Infrared Spectrometer ◽  
Freeform Lens
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