AUTOCALIBRATING MULTICHANNEL RADIOMETER

摘要

The auto-calibrating Multi-channel Radiometer comprises several antennas (2) sensing the thermal radiation from an object (1). Before the sensed power is getting fed into the n different amplification channels (4.1-4.n), the power might have to be split by a power splitter (3). After the amplification channels, the signal gets recombined by a correlator (5) before getting detected by a square law detector (6) and an integrator (7). An analogue-to- digital converter (8) makes the measurement readable by any personal computer. Additional components are two noise sources (10, 11) connected through cables (13, 14) to a four port dual-directional coupler (15). A high precision temperature sensor (16) connected through a cable (12) to a second channel of the analogue-to-digital converter (8) allows to monitor continuously the physical temperature of the radiometer. The measurement cycle is driven by the personal computer through the digital connections (17, 18).