Spectral-Coding-Based Compressive Single-Pixel NIR Spectroscopy in the Sub-Millisecond Regime

Gattinger, Paul; Zorin, Ivan; Rankl, Christian; Brandstetter, Markus

doi:10.3390/s21165563

Cited by 8 publications

(2 citation statements)

References 33 publications

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“…3 Besides, SPI systems exhibit a multiplex sensitivity advantage, also known as Fellget's advantage since several spatial (or spectral if encoded in this domain) channels are sampled simultaneously, reducing measurement noise per channel by segregating it across channels. [4][5][6] This fundamental advantage is also of great interest for the IR spectral range, as the noise of the detectors in this range is noticeably higher. 7 As defined above, in SPI, a sequence of spatial patterns was applied to mask the image to be sensed by a single-pixel detector.…”

Section: Experimental Setup: Hyperspectral Mid-ir Single-pixel Micros...mentioning

confidence: 99%

Diffraction-limited mid-infrared hyperspectral single-pixel imaging microscopy

Zorin¹,

Gattinger²,

Brandstetter³

et al. 2023

Optical Measurement Systems for Industrial Inspection XIII

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Mid-infrared (mid-IR) hyperspectral imaging is of great practical interest in various fields of science and industry due to its ability to provide spatially resolved label-free chemical information. However, the widespread adoption and advancement of mid-IR hyperspectral imaging are hindered by high costs and the specification lag of mid-IR focal plane arrays. In this contribution, we propose a method to circumvent this problem and thus demonstrate a solution for mid-IR hyperspectral imaging through the use of a single-pixel imaging paradigm involving a mid-IR enhanced digital micro-mirror device (DMD); as a light source, a high-brightness mid-IR supercontinuum source is exploited. The developed mid-IR hyperspectral microscope enables the acquisition of hyperspectral cubes with dimensions of 64x64 pixels and a spectral resolution of 120 nm accomplished within approximately 450 ms. The developed laser-based system provides rapid mid-IR hyperspectral imaging with a programmable scalable field of view and variable spatial resolution. Thus, this solution represents a cost-effective alternative to state-of-the-art mid-infrared imagers.

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Section: Experimental Setup: Hyperspectral Mid-ir Single-pixel Micros...mentioning

confidence: 99%

Diffraction-limited mid-infrared hyperspectral single-pixel imaging microscopy

Zorin¹,

Gattinger²,

Brandstetter³

et al. 2023

Optical Measurement Systems for Industrial Inspection XIII

View full text Add to dashboard Cite

show abstract

“…Single pixel detection together with compressed sensing − have been revolutionizing imaging methods. Surprisingly, the penetration of this method in spectroscopy has been very limited due to mechanical resolution limits; that is, due to the requirement of rotating optics such as gratings or mirrors in single-pixel spectroscopic analysis .…”

Section: Introductionmentioning

confidence: 99%

Single-Pixel Multimode Fiber Spectrometer via Wavefront Shaping

2023

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When light passes through a multimode fiber, two-dimensional random intensity patterns are formed due to complex interference within the fiber. The extreme sensitivity of speckle patterns to the frequency of light paved the way for high-resolution multimode fiber spectrometers. However, this approach requires expensive IR cameras and impedes the integration of spectrometers on-chip. In this study, we propose a single-pixel multimode fiber spectrometer by exploiting wavefront shaping. The input light is structured with the help of a spatial light modulator, and optimal phase masks, focusing light at the distal end of the fiber, are stored for each wavelength. Variation of the intensity in the focused region is recorded by scanning all wavelengths under fixed optimal masks. Based on the intensity measurements, we show that an arbitrary input spectrum having two wavelengths 20 pm apart from each other can be reconstructed successfully (with a reconstruction error of ∼3%) in the near-infrared regime, corresponding to a resolving power of R ≈ 105. We also demonstrate the reconstruction of broadband continuous spectra with varying bandwidths. With the installation of a single-pixel detector, our method provides compact detection and a lower budget alternative to conventional systems, with potential promise to operate at low-signal levels.

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