|
|
Ozhegov RV, Okunev OV, Gol’tsman GN, Filippenko LV, Koshelets VP. Noise equivalent temperature difference of a superconducting integrated terahertz receiver. J Commun Technol Electron. 2009;54(6):716–20.
Abstract: The dependence of the noise equivalent temperature difference (NETD) of a superconducting integrated receiver (SIR) on the receiver noise temperature and the inputsignal level has been investigated. An unprecedented NETD of 13±2 mK has been measured at a SIR noise temperature of 200 K, intermediate-frequency bandwidth of 4 GHz, and time constant of 1 s. With a decrease in the input signal, an improvement in the NETD is observed. This effect is explained by a reduction in the influence of the instabilities of the receiver power supply and the amplification circuit that occur when the input signal is decreased.
|
|
|
|
Koshelets VP, Khudchenko AV. Analysis of spectral characteristics of a superconducting integrated receiver. J. Communications Technol. Electron.. 2006;51(5):596–603.
|
|
|
|
Ozhegov RV, Gorshkov KN, Gol'tsman GN, Kinev NV, Koshelets VP. The stability of a terahertz receiver based on a superconducting integrated receiver. Supercond Sci Technol. 2011;24(3):035003.
Abstract: We present the results of stability testing of a terahertz radiometer based on a superconducting receiver with a SIS tunnel junction as the mixer and a flux-flow oscillator as the local oscillator. In the continuum mode, the receiver with a noise temperature of 95 K at 510 GHz measured over the intermediate frequency (IF) passband of 4-8 GHz offered a noise equivalent temperature difference of 10 ± 1 mK at an integration time of 1 s. We offer a method to significantly increase the integration time without the use of complex measurement equipment. The receiver observed a strong signal over a final detection bandwidth of 4 GHz and offered an Allan time of 5 s.
|
|
|
|
Koshelets VP, Dmitriev PN, Ermakov AB, Sobolev AS, Torgashin MY, Kurin VV, et al. Optimization of the phase-locked flux-flow oscillator for the submm integrated receiver. IEEE Trans. Appl. Supercond.. 2005;15(2):964–7.
|
|
|
|
Koshelets VP, Shitov SV, Ermakov AB, Filippenko LV, Koryukin OV, Khudchenko AV, et al. Superconducting integrated receiver for TELIS. IEEE Trans. Appl. Supercond.. 2005;15(2):960–3.
|
|
|
|
Koshelets VP, Ermakov AB, Filippenko LV, Khudchenko AV, Kiselev OS, Sobolev AS, et al. Superconducting integrated submillimeter receiver for TELIS. IEEE Trans. Appl. Supercond.. 2007;17(2):336–42.
|
|
|
|
Torgashin MY, Koshelets VP, Dmitriev PN, Ermakov AB, Filippenko LV, Yagoubov PA. Superconducting Integrated Receiver Based on Nb-AlN-NbN-Nb Circuits. IEEE Trans. Appl. Supercond.. 2007;17(2):379–82.
|
|
|
|
Кошелец ВП, Дмитриев ПН, Ермаков АБ, Филиппенко ЛВ, Корюкин ОВ, Торгашин МЮ, et al. Интегральный сверхпроводниковый спектрометр. Известия вузов. Радиофизика. 2005;48(10-11):947–54.
|
|
|
|
Koshelets VP, Dmitriev PN, Ermakov AB, Filippenko LV, Koryukin OV, Torgashin MY, et al. Integrated superconducting spectrometer for atmosphere monitoring. Radiophys. Quant. Electron.. 2005;48(10-11):844–50.
|
|
|
|
Ozhegov RV, Gorshkov KN, Smirnov KV, Gol’tsman GN, Filippenko LV, Koshelets VP. Terahertz imaging system based on superconducting integrated receiver. In: Proc. 2-nd Int. Conf. Terahertz and Microwave radiation: Generation, Detection and Applications.; 2010. p. 20–2.
Abstract: The development of terahertz imaging instruments for security systems is on the cutting edge of terahertz technology. We are developing a THz imaging system based on a superconducting integrated receiver (SIR). An SIR is a new type of heterodyne receiver based on an SIS mixer integrated with a flux-flow oscillator (FFO) and a harmonic mixer which is used for phase-locking the FFO. Developing an array of SIRs would allow obtaining amplitude and phase characteristics of incident radiation in the plane of the receiver. Employing an SIR in an imaging system means building an entirely new instrument with many advantages compare to traditional systems: i) high temperature resolution, comparable to the best results for incoherent receivers; ii) high spectral resolution allowing spectral analysis of various substances; iii) the local oscillator frequency can be varied to obtain images at different frequencies, effectively providing “color” images; iv) since a heterodyne receiver preserves the phase of the radiation, it is possible to construct 3D images. The paper presents a prototype THz imaging system using an 1 pixel SIR. We have studied the dependence of the noise equivalent temperature difference (NETD) on the integration time and also possible ways of achieving best possible sensitivity. An NETD of 13 mK was obtained with an integration time of 1 sec a detection bandwidth of 4 GHz at a local oscillator frequency of 520 GHz. An important advantage of an FFO is its wide operation range: 300-700 GHz.
|
|
