Uncooled detectors of continuum terahertz radiation

Kaufmann, P.; Marcon, R.; Kudaka, A. S.; Cassiano, M. M.; Fernandes, L. O. T.; Marun, A.; Pereyra, P.; Godoy, R.; Bortolucci, E. C.; Zakia, M.B.P.; Diniz, J. A.; Silva, Alexandre; Timofeevsky, Alexander; Nikolaev, V.A.

doi:10.1590/s2179-10742011000100027

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…Three types of uncooled sensors were tested for THz radiation detection: a 10 μm camera adapted for THz, a pyroelectric modular sensor, and the Golay cell [see details in [22][23][24][25]. Two cameras for the 10 μm band were adapted using HRFZ-Si windows on the focal plane array for better THz response.…”

Section: A Prototype Thz Solar Photometermentioning

confidence: 99%

“…Several different experimental THz radiometer systems were mounted on several occasions, involving four laboratories in these developments. They were intended to test and characterize different types of low-pass filters, band-pass filters and options for detectors at room temperature, using temperature-controlled backbody radiation sources [22][23][24][25]. The objective, as mentioned before, was to verify the minimum detectable temperature variations, instrumental time constant, and other operational performance.…”

Section: A Prototype Thz Solar Photometermentioning

confidence: 99%

“…Detection of excess solar continuum radiation in the THz range poses several technological challenges [19][20][21]. They include the efficient suppression of the powerful visible and near infra-red background component of solar disc emission, the band-pass filtering and the appropriate selection of uncooled detector system and optical setup design to obtain enough sensitivity and time resolution [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Terahertz Photometer to Observe Solar Flares in Continuum

Marcon

Kaufmann

Fernandes

et al. 2011

J Infrared Milli Terahz Waves

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Solar observations at sub-THz frequencies detected a new flare spectral component peaking in the THz range, simultaneously with the well known microwaves component, bringing challenging constraints for interpretation. Higher THz frequencies observations are needed to understand the nature of the mechanisms occurring in flares. A THz photometer system was developed to observe outside the terrestrial atmosphere on stratospheric balloons or satellites, or at exceptionally transparent ground stations. The telescope was designed to observe the whole solar disk detecting small relative changes in input temperature caused by flares at localized positions. A Golay cell detector is preceded by low-pass filters to suppress visible and near IR radiation, a band-pass filter, and a chopper. A prototype was assembled to demonstrate the new concept and the system performance. It can detect temperature variations smaller than 1 K for data sampled at a rate of 10/s, smoothed for intervals larger than 4 s. For a 76 mm aperture, this corresponds to small solar burst intensities at THz frequencies. A system with 3 and 7 THz photometers is being built for solar flare observations on board of stratospheric balloon missions.

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Section: A Prototype Thz Solar Photometermentioning

confidence: 99%

Section: A Prototype Thz Solar Photometermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Terahertz Photometer to Observe Solar Flares in Continuum

Marcon

Kaufmann

Fernandes

et al. 2011

J Infrared Milli Terahz Waves

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“…Various fast and efficient THz wave detecting, generating, and absorbing components and devices are needed to build practical THz systems. However, most existing systems consist of large discrete elements: all-electronic multipliers with sophisticated waveguides [ 2 ], continuous-wave telecommunication laser-driven photomixers [ 3 ], bulky solid-state pulse laser-driven TDS systems [ 4 ], Golay cell, pyroelectric [ 5 ] or optoacoustic [ 6 ] device, or even cryogenic-cooling bolometers [ 7 ] in detectors role.…”

Section: Introductionmentioning

confidence: 99%

All-Electronic Emitter-Detector Pairs for 250 GHz in Silicon

Ikamas

But

Cesiul

et al. 2021

Sensors

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The spread of practical terahertz (THz) systems dedicated to the telecommunication, pharmacy, civil security, or medical markets requires the use of mainstream semiconductor technologies, such as complementary metal-oxide-semiconductor (CMOS) lines. In this paper, we discuss the operation of a CMOS-based free space all-electronic system operating near 250 GHz, exhibiting signal-to-noise ratio (SNR) with 62 dB in the direct detection regime for one Hz equivalent noise bandwidth. It combines the state-of-the-art detector based on CMOS field-effect-transistors (FET) and a harmonic voltage-controlled oscillator (VCO). Three generations of the oscillator circuit are presented, and the performance characterization techniques and their improvement are explained in detail. The manuscript presents different emitter–detector pair operation modalities, including spectroscopy and imaging.

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“…1). Most prominent fields of application of the detector include characterization of IR sources and receivers [15], monitoring of IR radiation fields [16], measurement of weak IR fluxes for spectrometry and low-temperature pyrometry applications [17], metrology [15,18], and various scientific applications that require detection of low-level signals (up to 10 -5 J) in the wavelength range from 15 μm to 6-8 mm [17].…”

mentioning

confidence: 99%

Pulse Shape Measurement Using Golay Detector

Кавеев¹,

Adaev²

2012

J Infrared Milli Terahz Waves

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The article discusses key physical processes within the active area of an optoacoustic detector. Said area is a xenon-filled chamber subdivided into two cavities connected by a narrow channel. Original mathematical model of such area is proposed on the basis of thermodynamic processes that occur within. A method has been developed to measure a shape of a periodic pulse exceeding 0.5 ms duration at repetition rates ranging from zero to several hundred Hz. The measurement requires knowledge of a set of parameters describing a specific instrument. Principal points of detector calibration are discussed in brief.

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Uncooled detectors of continuum terahertz radiation

Cited by 6 publications

References 14 publications

Terahertz Photometer to Observe Solar Flares in Continuum

Terahertz Photometer to Observe Solar Flares in Continuum

All-Electronic Emitter-Detector Pairs for 250 GHz in Silicon

Pulse Shape Measurement Using Golay Detector

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