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PHASE_SENSITIVE_DEMODULATOR

2015-03-22 19:11  
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PHASE_SENSITIVE_DEMODULATOR
Used in iceberg-detecting microwave radiometer. Faraday rotational ferrite switch alternately feeds calibrating noise source and ocean or iceberg signal through video amplifier to double-bridge demodulator. Output is d-c voltage proportional to change in antenna temperature, positive for warm signals from iceberg and negative for apparently colder sea water. Mvbr (125 cps) supplies reference voltage and ferrite drive signal.-T. V. Seling and D. K. Nance, Sensitive Microwave Radiometer Detects Small Icebergs, Electronics, 34:19, p 72-75.