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Design and Fabrication of Self-biased High-Tc Superconducting Radiation Detector

Yaghoubi, Mehdi | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54311 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Fardmanesh, Mehdi
  7. Abstract:
  8. A bolometer is a device for measuring electromagnetic waves, which uses the heating of a material with variable resistance to temperature. Due to the existing limitations and quality improvement, superconducting materials are used in the manufacture of these devices. In this dissertation, the construction and improvement of the components of a high temperature transient edge superconducting radiometer with terahertz detection capability is discussed. In the construction of these detectors, the superconducting material YBa2Cu3O7-x is used as a thermal sensor with a transition temperature of 93.5K. In order to characterize these detectors, an automatic system for measuring the voltage response and noise of the radiometer has been used. The manufactured devices have been studied in terms of structural parameters and bias.This system is based on the automatic temperature bias of the sensor. In superconductors, after intermittent heating and cooling, their resistance characteristic may change slightly. Therefore, biasing them requires the presence of an operator to control the system and determine the sensitive points of its function. Also, in making sensors, it is possible to use different superconductors to design and build sensors (that may have different resistance characteristics to each other), which increases the need to use an automated system. It should also be noted that due to the very high accuracy of signal measurement in superconducting sensors, the noise problem has a significant effect on the measurement and the signal-to-noise ratio. In the system having the slightest unwanted effect or noise will reduce signal-to-noise ratio, which makes adding even a smallest electronic circuit difficult for improving system usage. In this project, the intention is to build a sensor with an electronic part with very low noise (Ultra Low Noise) to automate the use in such a way that any changes in the characteristic and the use of superconductors with different characteristics can be done without increasing noise and with minimal intervention. In the end, the system we built has a very precise temperature control (below 2 mK) and very low noise
  9. Keywords:
  10. Superconductor ; Detector ; Autonomous System ; Signal to Noise Ratio ; Bias ; Bolometer ; Superconductive Edge Transition Bolometer ; Heat Sensors

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