Signal-to-noise ratio enhancement of a Hadamard transform spectrometer using a two-dimensional slit-array

The effect of a single defective mask element on the output signal-to-noise ratio (SNR) for a stationary-mask Hadamard transform (HT) spectrometer is investigated. The decrease in output-SNR from that of an HT spectrometer having a perfect mask is found to be dependent on the amount of energy impinging on the defective element. A method of compensating for the defective mask element is presented. The method is computationally inexpensive and can be fully automated.

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Two-dimensional aperture photometry - Signal-to-noise ratio of point-source observations and optimal data-extraction techniques

Publications of the Astronomical Society of the Pacific ◽

10.1086/132477 ◽

1989 ◽

Vol 101 ◽

pp. 616 ◽

Cited By ~ 130

Author(s):

Steve B. Howell

Keyword(s):

Point Source ◽

Signal To Noise Ratio ◽

Data Extraction ◽

Two Dimensional ◽

Extraction Techniques ◽

Signal To Noise ◽

Noise Ratio

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Multiparametric approach to the assessment of muon tomographic results for the inspection of a full-scale container

The European Physical Journal Plus ◽

10.1140/epjp/s13360-020-00970-z ◽

2021 ◽

Vol 136 (1) ◽

Author(s):

F. Riggi ◽

M. Bandieramonte ◽

U. Becciani ◽

D. L. Bonanno ◽

G. Bonanno ◽

...

Keyword(s):

Signal To Noise Ratio ◽

Single Scattering ◽

Full Scale ◽

Experimental Results ◽

Two Dimensional ◽

Signal To Noise ◽

Scattering Angle ◽

Multiparametric Analysis ◽

Noise Ratio ◽

Cargo Containers

AbstractExperimental results from a dataset collected with a full-scale muon tomograph for the inspection of cargo containers were studied in a single scattering scenario with a multiparametric analysis based on the method of the Point Of Closest Approach (Poca). To search for high-Z materials, a 4 $$\hbox {dm}^3$$ dm 3 Pb block was positioned inside the volume to be inspected, in order to quantitatively investigate the appearance of the Poca signal. Signal-to-noise ratio and significance of the Poca signal were investigated by means of mono-dimensional spectra of the Poca components, for different values of the scattering angle between the incoming and outgoing muon tracks and with different angle-dependent weights. A systematic scan of two-dimensional maps was also carried out, as a strategy to search for possible enhancements to the Poca signal. A comparison was also done between the results obtained from the two half-volumes, one containing the Pb block and one left empty, to take into account the response of the detector and some aspects of the Poca strategy.

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A triple-drain MOSFET magnetic-field sensor

Canadian Journal of Physics ◽

10.1139/p85-107 ◽

1985 ◽

Vol 63 (6) ◽

pp. 695-698 ◽

Cited By ~ 5

Author(s):

A. Nathan ◽

A. M. J. Huiser ◽

H. P. Baltes ◽

H. G. Schmidt-Weinmar

Keyword(s):

Magnetic Field ◽

Surface Charge ◽

Signal To Noise Ratio ◽

Magnetic Field Sensor ◽

Two Dimensional ◽

Signal To Noise ◽

Linear Region ◽

Field Sensor ◽

Device Geometry ◽

Noise Ratio

The two-dimensional distributions of the potential, current, and surface charge for a magnetic-field-sensitive N-channel MOSFET have been computed numerically. The MOSFET is operated in the linear region and is based on a triple-drain configuration. The sensitivity as well as the signal-to-noise ratio is studied for a variety of channel geometries, and an optimal device geometry is presented.

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Influence of multiplexing conditions on artefact signal and the signal-to-noise ratio in the decoded data in Hadamard transform ion mobility spectrometry

European Journal of Mass Spectrometry ◽

10.1177/1469066719900763 ◽

2020 ◽

Vol 26 (3) ◽

pp. 204-212

Author(s):

Anastasia Sarycheva ◽

Alexey Adamov ◽

Sergey S Poteshin ◽

Sergey S Lagunov ◽

Alexey A Sysoev

Keyword(s):

Ion Mobility Spectrometry ◽

Ion Mobility ◽

Signal To Noise Ratio ◽

Random Noise ◽

Utilization Efficiency ◽

Hadamard Transform ◽

Signal Averaging ◽

Signal To Noise ◽

Pseudorandom Sequences ◽

Noise Ratio

In Hadamard transform ion mobility spectrometry (HT IMS), the signal-to-noise ratio is always lower for non-modified pseudorandom sequences than for modified sequences. Since the use of non-modified modulating pseudorandom sequences is strategically preferable from a duty cycle standpoint, we investigated the change in the interference signal when transitioning from non-modified modulating sequences to sequences modified by the addition of 1,3,5 and 7 zeros. The interfering signal in HT IMS with modified pseudorandom sequences was shown to be mainly random noise for all the cases except for modifying by incorporation of 1 zero. For standard samples of tetraalkylammonium halides, modulation by non-modified pseudorandom sequences is beneficial in the case of small numbers of averaged spectra (below ∼40 averaged spectra compared to any modified pseudorandom sequences except for 1 zero modified and below ∼200 averaged spectra compared to signal averaging ion mobility spectrometry) and worsens the signal-to-noise ratio in the case of large numbers of averaged spectra. Contrarily, modulation by modified pseudorandom sequences is beneficial for any number of averaged spectra, except for very small ones (below 15 averaged spectra compared to modulation by non-modified sequences). Pseudorandom sequence modified with 1 zero incorporation is beneficial in the case of below ∼400 averaged spectra compared to any modified and non-modified pseudorandom sequences. The signal-to-noise ratio in conventional signal averaging mode ion mobility spectrometry is affected by random noise, whereas the HT IMS with non-modified pseudorandom sequences was demonstrated to be primarily affected by a systematic noise-like artefact signal. Because noise-like artefact signals were found to be reproducible, predicting models for interference signals could be generated to improve signal-to-noise ratio. This is significant because non-modified modulating sequences are limited by their poor signal-to-noise ratio. This improvement would increase the viability of non-modified modulating sequences which are preferred because of their higher sample utilization efficiency.

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