In this paper we describe the realization of a low cost radiometer which can be used to detect and show the microwave electromagnetic field emitted from human body. The system uses components available in the consumer market: low cost LNB (Low Noise Block: low noise pre-amplifier, mixer and post-amplifiers) and a parabolic antenna for satellite TV. The base line stability problems of the system are removed using a detector in linear region and a digital integrator for correction of the base line. The PC resident software triggers an educational video on the origins of electromagnetic radiation when a person, entering in the antenna beam, is detected; in addition to this, it is possible to show an infrared image taken by a camera.
2. Wilson, W. J., A. B. Tanner, F. A. Pellerano, and K. A. Horgan, "Ultra stable radiometers for future sea surface salinity missions,", JPL Report D-31794, 2005.
3. Camps, A. and J. M. Tarongi, "Microwave radiometer resolution optimization using variable observation time," Remote Sensing, Vol. 2, No. 7, 1826-1843, 2010.
4. Amaduzzi, L. and M. Tinti, "Implementation of a microwave dicke receiver," Electronics World, Vol. 114, No. 1864, Apr. 2008.
5. Eriksson, H. and R. W. Waugh, "A temperature compensated linear diode detector,", Design Tip Agilent.
6. Axelson, J., Serial Port Complete: COM Ports, USB Virtual COM Ports, and Ports for Embedded Systems, 2nd Edition, Lakeview Research LLC, 2010.
7. Microchip Technology Inc, , PIC16F87X Data Sheet, DS30292B.
8. Forest Electronic Developments, , PIC C Compiler.