Parametric Transducer for Gravitational Radiation Detector
Abstract
A low-noise parametric vibration transducer using a pair of superconducting microwave cavities has been developed for use with cryogenic gravitational radiation antennas. Pumped by a 9.7-GHz SCSO, the cavities convert mechanical vibration into microwave sidebands which, after demodulation, reproduce the low-frequency signal. For the performance test of the transducer system, the cavities were mounted on a 15-kHz prototype disk antenna at 4.2 K. A transducer noise temperature of 23 mK was obtained at the antenna frequency, and hence a quantum noise number of 3.4× 104.
- Publication:
-
Japanese Journal of Applied Physics
- Pub Date:
- April 1986
- DOI:
- 10.1143/JJAP.25.622
- Bibcode:
- 1986JaJAP..25..622T
- Keywords:
-
- Gravitational Wave Antennas;
- Low Noise;
- Microwave Resonance;
- Parametric Amplifiers;
- Transducers;
- Aluminum Alloys;
- Antenna Design;
- Cryostats;
- Noise Reduction;
- Noise Temperature;
- Superconductors;
- Instrumentation and Photography