Accession Number:
ADA614351
Title:
Superconducting Quantum Interference Devices for the Detection of Magnetic Flux and Application to Airborne High Frequency Direction Finding
Descriptive Note:
Master's thesis
Corporate Author:
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
Personal Author(s):
Report Date:
2015-03-26
Pagination or Media Count:
138.0
Abstract:
Electrically small antennas trade reception performance for physical size reduction. The SQUID maximizes the reception performance still achieving a physically small size leading to satisfying the demanding antenna requirements of an airborne high frequency direction finding antenna system. High frequency electromagnetic reception for a direct current DC superconducting quantum interference device SQUID is simulated using the resistor-capacitor-shunted-junction RCSJ electronic circuit model, producing a set of two-dimensional ordinary differential equations to describe the electrical operating characteristics for the DC SQUID. A time-varying magnetic flux, consisting of frequencies from the HF band, is applied to characterize the voltage response of the DC SQUID. An instantaneous voltage develops across the DC SQUID, although a fast time-average must be computed to produce usable voltage samples. These voltage samples are shown to be representative samples of the applied time-varying signal containing a voltage bias. The waveform produced from these voltage samples is periodic, while preserving the phase of the incident signal. The HF reception characteristics of a single DC SQUID is shown, including an examination for expanding the loop area, simulating a DC SQUID array. Additionally, the DC SQUID is compared to the MGL-S8A BDOT sensor using by optical responsitivity.
Descriptors:
- *ANTENNAS
- *DETECTION
- *DIRECTION FINDING
- *QUANTUM ELECTRONICS
- *SUPERCONDUCTIVITY
- ARRAYS
- BIAS
- CIRCUITS
- DETECTORS
- DIFFERENTIAL EQUATIONS
- DIRECT CURRENT
- ELECTRICAL PROPERTIES
- ELECTROMAGNETISM
- ELECTRONIC EQUIPMENT
- FLUX(RATE)
- FREQUENCY
- FREQUENCY BANDS
- HIGH FREQUENCY
- INTERFERENCE
- JUNCTIONS
- LOOPS
- MAGNETIC FIELDS
- MODELS
- OPTICAL PROPERTIES
- QUANTUM THEORY
- RECEPTION
- REQUIREMENTS
- RESPONSE
- SAMPLING
- SIGNALS
- SIMULATION
- THESES
- VARIATIONS
- VOLTAGE
- WAVEFORMS
Subject Categories:
- Electrical and Electronic Equipment
- Quantum Theory and Relativity