Noise of High Temperature Superconducting Bolometers

Khrebtov, I. A.

doi:10.1007/1-4020-2170-4_12

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…This relation also means that noise measured for the low‐frequency regime is observed to be much higher than for the same detector at higher frequency corresponding to the inverse relation to frequency. [ 26,27 ] For the system measured here, this also implies that values for G i and C i modeled for low frequency data is not expected to be correct for higher frequency regimes.…”

Section: Resultsmentioning

confidence: 94%

Effective Thermal Properties of a HTS Transition Edge Bolometer for High‐Flux Neutron Detection

Brock,

Østergaard,

Wulff

et al. 2023

Adv Elect Materials

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Many applications require monitoring of increasingly high neutron flux levels. Pre‐neutron characterization is performed of a superconducting transition edge bolometric device, sensitive to neutrons by an enriched boron carbide (10B4C) layer. Heat from the absorption of neutrons is simulated using an attenuated laser, while the detector is cooled to the critical temperature, Tc. Frequency dependent (4–25 Hz) and constant input power measurements are performed on a 10B4C‐coated and a non‐coated pixel. Results are used to fit a two lumped element thermal model. The effective specific heat is highly dependent on the input pulse duration due to the interconnected stack structure. For modulated pulses, the active volume in the thermal circuit is the full depth of the substrate in the area under the pixel. For constant power input, a large portion of the substrate is heated and the interface conductivities to the cold finger are found to be important. The detectivity is D* = 3.5 × 108 , and is only slightly lower than similar detectors. Understanding the dynamics of the detector better and using neutron excitation, it is expected that optimizations can lead to an equally good detector for cold to thermal neutrons at flux levels >106 n cm−2s−1.

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Section: Resultsmentioning

confidence: 94%

Effective Thermal Properties of a HTS Transition Edge Bolometer for High‐Flux Neutron Detection

Brock,

Østergaard,

Wulff

et al. 2023

Adv Elect Materials

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“…The total NEP for a high-temperature superconductor bolometer is obtained as follows [8], [15], [26]: By considering (4) and (5), the dependence of responsivity versus chopping frequency can be obtained through (2) [19]. Substituting (6) using the result of (2) into (1), the spectrum of the detectivity of the device versus chopping is calculated.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…The voltage responsivity versus modulation frequency and temperature has previously been analyzed, which, according to the simple RC model, leads to [15]- [18] r v = ηL 0…”

Section: Theoretical Modelmentioning

confidence: 99%

Investigation of Bias Current and Modulation Frequency Dependences of Detectivity of YBCO TES and the Effects of Coating of Cu–C Composite Absorber Layer

Moftakharzadeh

Kokabi

Bozbey

et al. 2009

IEEE Trans. Appl. Supercond.

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Bolometric response and noise characteristics of YBCO superconductor transition edge IR detectors with relatively sharp transition and its resulting detectivity are investigated both theoretically and experimentally. The magnitude of response of a fabricated device was obtained for different bias currents and modulation frequencies. Using the measured and calculated bolometric response and noise characteristics, we found and analyzed the device detectivity versus frequency for different bias currents. The detectivity versus chopping frequency of the device did not decrease following the response strongly, due to the decrease of the noise at higher frequencies up to 1 kHz, resulting in maximum detectivity around the modulation frequency of 100 Hz. We also improved the responsivity of the device through the increase of the surface absorption by using a novel infrared absorber, which is made of a copper-carbon composite, coated in a low-temperature process. Within the modulation frequency range studied in this paper, comparison of device detectivity before and after coating is also presented.Index Terms-Detectivity, infrared absorber, transition edge sensor (TES).

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Detectivity Analysis and Optimization of Large-Area Freestanding-Type HTS Bolometers

Moftakharzadeh

Kokabi

Banzet

et al. 2012

IEEE Trans. Appl. Supercond.

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Noise of High Temperature Superconducting Bolometers

Cited by 3 publications

References 18 publications

Effective Thermal Properties of a HTS Transition Edge Bolometer for High‐Flux Neutron Detection

Effective Thermal Properties of a HTS Transition Edge Bolometer for High‐Flux Neutron Detection

Investigation of Bias Current and Modulation Frequency Dependences of Detectivity of YBCO TES and the Effects of Coating of Cu–C Composite Absorber Layer

Detectivity Analysis and Optimization of Large-Area Freestanding-Type HTS Bolometers

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