Surgery – Truss – Pad
Patent
1985-03-21
1987-07-07
Yasich, Daniel W.
Surgery
Truss
Pad
128653, 374122, A61B 505, A61N 502
Patent
active
046779884
ABSTRACT:
The invention relates to an impedance adaptation control process in low noise reception chains and a miniature microwave thermometer of application of the said process. The process is used mainly in order to measure internal temperature by microwave thermography. The thermal radiation is picked up by means of an aerial (1) which provides a signal (2). This signal (2) is sent alternatively with a signal (5) coming from a standard source to a hyperfrequency amplifier (3) in order to compare the said signals (2,5) and to adjust the source (4) in consequence. According to the invention, in parallel, an additional impedance (15) is placed by intermittance in parallel to the input of the amplifier (3). By means of a synchronous detection (18) of the resulting signal (7), the impedance of the standard source (4) is adjusted so as to equal that of the aerial (1). The invention would, in particular, be applied for gauging the instruments for measuring the noise of dipoles and quadripoles such as microwave thermography.
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"Subcutaneous Temperatures: A Method of Noninvasive Sensing", Barrett et al, Science V 190-11/17/75, pp. 669-671.
Constant Eugene
Leroy Yves
Van De Velde Jean-Claude
Adams Bruce L.
Burns Robert E.
Centre National de la Recherche Scientifique
Lobato Emmanuel J.
Yasich Daniel W.
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