SNR analysis and Hadamard mask modification of DMD Hadamard Transform Near-Infrared spectrometer

Xu, Jialin; Liu, Hua; Lin, Chun-bo; Sun, Quan

doi:10.1016/j.optcom.2016.07.086

Cited by 26 publications

(12 citation statements)

References 9 publications

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“…Besides, CS theory was also utilized to reduce the required number of measurements, thus significantly reducing the sampling time [128,129]. It should be noted that the real resolution of a spectrometric system is also dependent on the optical set-up, so some improvement and analysis have been done by modifying the mask pattern widths to improve the performance of the DMD-based spectrometers in near-infrared sensing applications [130]. More recent explorations have been reported by using the MEMS mechanical mask consisting of sequential encoding rows [131].…”

Section: One Dimensional Imaging: Spectrometermentioning

confidence: 99%

Single-Pixel MEMS Imaging Systems

Zhou

Lim

2020

Micromachines

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Single-pixel imaging technology is an attractive technology considering the increasing demand of imagers that can operate in wavelengths where traditional cameras have limited efficiency. Meanwhile, the miniaturization of imaging systems is also desired to build affordable and portable devices for field applications. Therefore, single-pixel imaging systems based on microelectromechanical systems (MEMS) is an effective solution to develop truly miniaturized imagers, owing to their ability to integrate multiple functionalities within a small device. MEMS-based single-pixel imaging systems have mainly been explored in two research directions, namely the encoding-based approach and the scanning-based approach. The scanning method utilizes a variety of MEMS scanners to scan the target scenery and has potential applications in the biological imaging field. The encoding-based system typically employs MEMS modulators and a single-pixel detector to encode the light intensities of the scenery, and the images are constructed by harvesting the power of computational technology. This has the capability to capture non-visible images and 3D images. Thus, this review discusses the two approaches in detail, and their applications are also reviewed to evaluate the efficiency and advantages in various fields.

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Section: One Dimensional Imaging: Spectrometermentioning

confidence: 99%

Single-Pixel MEMS Imaging Systems

Zhou

Lim

2020

Micromachines

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“…Further, the SNR gain becomes n2 [16]. In [8], Xu et al concluded that if we want to give priority to select the HT scan mode, some conditions should be satisfied. When the order n is sufficiently large so that the detector noise is equal to the illumination noise, the total noise after the HT will be lower than that after the column scan.…”

Section: Snr Improvement Of Low Relative-power Waveband By a New Hmentioning

confidence: 99%

“…According to [8], the SNR for the column scan method and S matrix of the HT is respectively expressed: SNRS=D(Dη)2+Δ2 SNRH=D(Dη×2nn+1)2+(2nn+1Δ)2 where D is the real spectral intensity of the light source, η is the stability of the light source, Δ is the electronic system noise collected by the analog-to digital converter (AD), and n is the matrix order of HT. Based on Equations (3) and (4), we obtain the relationship between relative power intensity and SNR, and the relationship between HT order and SNR, as shown in Figure 8 and Figure 9.…”

Section: Snr Improvement Of Low Relative-power Waveband By a New Hmentioning

confidence: 99%

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

Zhang

Liu

et al. 2019

Micromachines

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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.

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“…This type of spectrometer can be classified into two categories based on spectroscopic principles: (1) nondispersive methods and (2) dispersive methods. The typical representatives of the former are the Fourier transform spectrometer (FTS) [ 4 ], the Fabry–Perot interferometer (FPI) [ 5 , 6 ], the grating light modulator spectrometer [ 7 ] and the quantum dot spectrometer [ 8 ]. Sandner proposed a Fourier transform spectrometer that utilizes an out-of-plane MEMS mirror in 2007 [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Miniaturized NIR Spectrometer Based on Novel MOEMS Scanning Tilted Grating

et al. 2018

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This paper presents a dispersive near-infrared spectrometer with features of miniaturization, portability and low cost. The application of a resonantly-driven scanning grating mirror (SGM) as a dispersive element in a crossed Czerny–Turner configuration enables the design of a miniaturized spectrometer that can detect the full spectra using only one single InGaAs diode. In addition, a high accuracy recalculation is realized, which can convert time-dependent measurements to spectrum information by utilizing the deflection position detector integrated on SGM and its associated closed-loop control circuit. Finally, the spectrometer prototype is subjected to a series of tests to characterize the instrument’s performance fully. The results of the experiment show that the spectrometer works in a spectral range of 800 nm–1800 nm with a resolution of less than 10 nm, a size of 9 × 7 × 7 cm3, a wavelength stability better than ±1 nm and a measuring time of less than 1 ms. Furthermore, the power consumption of the instrument is 3 W at 5 V DC, and the signal-to-noise ratio is 3267 at full scale. Therefore, this spectrometer could be a potential alternative to classical spectrometers in process control applications or could be used as a portable or airborne spectroscopic sensor.

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SNR analysis and Hadamard mask modification of DMD Hadamard Transform Near-Infrared spectrometer

Cited by 26 publications

References 9 publications

Single-Pixel MEMS Imaging Systems

Single-Pixel MEMS Imaging Systems

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

Miniaturized NIR Spectrometer Based on Novel MOEMS Scanning Tilted Grating

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