Signal-to-noise ratio and other characteristics of heterodyne radiation receivers

Blaney, T. G.

doi:10.1007/bf00727583

Cited by 58 publications

(15 citation statements)

References 4 publications

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“…Although a lot of works in the THz spectral range has already been done under the older terms "far infrared" (see, e.g., [14,15]) or sub-mm waves (see, e.g., [16,17]), the term "terahertz" stands for a novel technique offering many potential applications applying the THz technologies to industry, medicine, detection of drugs and explosives, telecommunications, etc. The term "terahertz" also represents a new generation of systems.…”

Section: Brief History Of Thz Technologiesmentioning

confidence: 99%

Brief history of THz and IR technologies

Sizov¹

2019

Semicond. Phys. Quantum Electron. and Optoelectron.

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Brief history of terahertz (THz) and infrared (IR) science and technology, for learning lessons by historical evolution is presented and discussed identifying important (from Author's point of view) steps for their development. THz still is the not well-known region of electromagnetic science, even it has been lightened by starting of scientific and technological knowledge, since the end of 19 th century. As concerning history of IR science and technology, it took many years since 1800 (W. Hershel) to reach the level of use that is recognized today. The link between IR and thermal science and applications was so strong that IR was for a long time synonymous of thermography. THz science and technology are showing a rapid growth. IR and, especially THz technologies, now have become one of the major fields of applied research. Nowadays, they become widely spread in their use in astrophysics, security, biomedicine, detection of hidden objects, food and art inspection, etc. The increasing requirements for fast transmission of large amounts of data will lead to the extension of operation frequencies in communications toward the THz frequency range. IR and THz medical imaging can provide guidance for surgeons in delimiting the tumor margins, help clinicians visualize diseased area, etc. A few decades ago, IR technologies were mainly the domain of military ones. In recent two decades, due to widespread of lowcost thermal uncooled arrays there were realized many IR technology advances in civil and military applications. A large amount of THz technologies mass-market applications can't be highlighted, as these technologies do not meet yet the user requirements, especially in easiness of use and costs. Still, many of THz applications that we have now are emerging and showing their applicability in some implementations, where other methods can't give any comprehensive information, e.g., in dry food inspection for dielectric inclusions, skin tumour margins control, THz astronomy, package and envelope inspection, etc. The brief lessons given by historical highlights in THz and IR science and applications can be important for the future developments in these directions as history frequently opens routes for new thinking. In this brief review, the missed important steps can happen. Author apologizes for these possible faults.

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Section: Brief History Of Thz Technologiesmentioning

confidence: 99%

Brief history of THz and IR technologies

Sizov¹

2019

Semicond. Phys. Quantum Electron. and Optoelectron.

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“…Now frequently terahertz region is considered to be between 0.1 THz and 10 THz [1,17,18]. Partial overlapping with THz range is frequently used as the term "far-infrared" [19,20] (FIR, VLWIR), which is often taken from 100 to 1000 µm (see, e.g., [9,10]). The range placed between frequencies from 300 GHz to 3 THz is usually called as the submillimeter-wave band [21], though in this paper the terms "terahertz" and "submillimeter-wave" are considered to be synonyms.…”

Section: Figmentioning

confidence: 99%

Infrared and terahertz in biomedicine

Sizov¹

2017

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. A number of potential advances of infrared and terahertz technologies in application mainly to biomedicine is shortly discussed. In spite of the fact that there are a number well established imaging and spectroscopic techniques in application to biomedicine there exists some problems where IR and THz technologies are the challenging technologies that can provide information not available from other techniques. E.g., they can be applied in the cases where there is a need of improving the surgical removal of cancer, strictly locating tumor margins when conservation of normal tissue is needed.

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“…The mixing element here is typically a photoconductor, a photomultiplier or a bolometer. Reviews of the operation of these mixer types have been given, for example, by Teich (1970), Blaney (1975) and Rieke (1994). Recent superconducting bolometer mixers have been described by Gundlach (1995) and Gousev et al (1996).…”

Section: Heterodyne Detection Schemementioning

confidence: 99%

“…With the same parameters the NEP is 4.4 × 10 −15 W for a video bandwidth of 1 Hz. For a discussion of the fundamental limits in sensitivity see Blaney (1975). A comparison of coherent and incoherent detection systems is given by Hartfuss (1989b) and by Harris (1991).…”

Section: System Parametersmentioning

confidence: 99%

Heterodyne methods in millimetre wave plasma diagnostics with applications to ECE, interferometry and reflectometry

Hartfuss

Geist

Hirsch

1997

Plasma Phys. Control. Fusion

189

173

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Basic principles of heterodyne techniques are introduced and the various components of a heterodyne system are summarized. Special applications in ECE, interferometry and reflectometry are discussed after introducing the diagnostic principles. Realized systems as described in the literature are briefly outlined. Ordering principles are radiometer types in the case of ECE, mixing scheme and generation and stabilization of local oscillator and intermediate frequency signals in the case of interferometry and reflectometry. Special techniques and their impact on the performance of the diagnostic instruments are discussed. Contents Introduction 1694 Components of the heterodyne receiver 1695 2.1 Heterodyne detection scheme 1696 2.1.1 Mixers 1697 2.1.2 Local oscillators 1705 2.1.3 IF chain 1706 2.2 Sensitivity 1707 2.3 Antennas and waveguides 1709 Radiometry of electron cyclotron emission 1711 3.1 Principles of ECE diagnostics 1711 3.1.1 Frequency and intensity of the emission 1711 3.

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Signal-to-noise ratio and other characteristics of heterodyne radiation receivers

Cited by 58 publications

References 4 publications

Brief history of THz and IR technologies

Brief history of THz and IR technologies

Infrared and terahertz in biomedicine

Heterodyne methods in millimetre wave plasma diagnostics with applications to ECE, interferometry and reflectometry

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