Noise-equivalent power characterization of an uncooled microbolometer-based THz imaging camera

Bolduc, M.; Terroux, Marc; Tremblay, Bruno; Marchese, Linda; Savard, Éric; Doucet, Michel; Oulachgar, Hassane; Alain, Christine; Jerominek, Hubert; Bergeron, Alain

doi:10.1117/12.883507

Cited by 35 publications

(20 citation statements)

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“…Simoens et al developed a microbolometer-array prototype for explosives detection at two different frequencies [56,57]. Bolduc et al used a microbolometer-based THz imaging camera to detect a concealed plastic knife [58].…”

Section: Terahertz Spectroscopy and Imagingmentioning

confidence: 99%

Advances in explosives analysis—part II: photon and neutron methods

et al. 2015

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The number and capability of explosives detection and analysis methods have increased dramatically since publication of the Analytical and Bioanalytical Chemistry special issue devoted to Explosives Analysis [Moore DS, Goodpaster JV, Anal Bioanal Chem 395:245-246, 2009]. Here we review and critically evaluate the latest (the past five years) important advances in explosives detection, with details of the improvements over previous methods, and suggest possible avenues towards further advances in, e.g., stand-off distance, detection limit, selectivity, and penetration through camouflage or packaging. The review consists of two parts. Part I discussed methods based on animals, chemicals (including colorimetry, molecularly imprinted polymers, electrochemistry, and immunochemistry), ions (both ion-mobility spectrometry and mass spectrometry), and mechanical devices. This part, Part II, will review methods based on photons, from very energetic photons including X-rays and gamma rays down to the terahertz range, and neutrons.

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Section: Terahertz Spectroscopy and Imagingmentioning

confidence: 99%

Advances in explosives analysis—part II: photon and neutron methods

et al. 2015

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“…INO has developed detectors and camera cores for THz imaging [6] [7]. A 160 x 120 pixel detector with 52 µm pixel pitch has been used to evaluate the refractive optics performances.…”

Section: Refractive Optics In Terahertzmentioning

confidence: 99%

Catadioptric optics for high-resolution terahertz imager

et al. 2012

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INO has developed infrared camera systems with microscanning capabilities in order to increase image resolution. It has been shown in previous works that the image quality may be improved even if the pixel pitch is smaller than the point spread function. [1] This paper introduces a catadioptric optics system with fully integrated microscan for improved resolution in the THz band. The design, inspired by the INO's HRXCAM infrared camera core and adapted for terahertz wavelengths, includes two mirrors and one refractive element. It has a 11.9 degree full field of view and an effective F-number of 1.07 over a wide spectral range, from 100 µm to 1.5 mm wavelength. This diffraction limited optics is used to provide video rate high quality THz images. A THz camera, with 160 x 120 pixel and 52 µm pitch detector, is combined with the microscan objective to provide a 320 x 240 pixel image with a 26 µm sampling step.Preliminary imaging results using a THz illumination source at 118 µm wavelength are presented. A comparison between standard and microscanned images is also presented.

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“…Noise equivalent power (NEP) is a common parameter used to evaluate the sensitivity of the THz detector, and it can be defined as the signal power that results in a signal-to-noise ratio of one in a one hertz output bandwidth 29 . By definition, the NEP of the imaging system can be expressed as NEP = z n /R v (Refs.…”

Section: Simulations and Characterizations Of The Photomechanical Metmentioning

confidence: 99%

Photomechanical meta-molecule array for real-time terahertz imaging

Wen

Jia

et al. 2017

Microsyst Nanoeng

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Real-time terahertz (THz) imaging offers remarkable application possibilities, especially in the security and medical fields. However, most THz detectors work with scanners, and a long image acquisition time is required. Some thermal detectors can achieve realtime imaging by using a focal plane array but have the drawbacks of low sensitivity due to a lack of suitable absorbing materials. In this study, we propose a novel photomechanical meta-molecule array by conveniently assembling THz meta-atom absorbers and bi-material cantilevers together, which can couple THz radiation to a mechanical deflection of the meta-molecules with high efficiency. By optically reading out the mechanical deflections of all of the meta-molecules simultaneously, real-time THz imaging can be achieved. A polyimide sacrificial layer technique was developed to fabricate the device on a glass wafer, which facilitates the transmission of a readout light while the THz wave radiates onto the meta-molecule array directly from the front side. THz images and video of various objects as well as infrared images of the human body were captured successfully with the fabricated metamolecule array. The proposed photomechanical device holds promise in applications in single and broadband THz as well as infrared imaging.

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Noise-equivalent power characterization of an uncooled microbolometer-based THz imaging camera

Cited by 35 publications

References 0 publications

Advances in explosives analysis—part II: photon and neutron methods

Advances in explosives analysis—part II: photon and neutron methods

Catadioptric optics for high-resolution terahertz imager

Photomechanical meta-molecule array for real-time terahertz imaging

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