H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/26, 73/72, 3
H04B 1/59 (2006.01) B61L 25/04 (2006.01) G01K 1/02 (2006.01) G01K 11/24 (2006.01) G01S 13/76 (2006.01) A61K 38/00 (2006.01)
Patent
CA 1142621
- 1a - ABSTRACT OF THE DISCLOSURE An apparatus for remote temperature reading particularly for the reading of the temperature of an article or animal at a distance by means of an electromagnetically interrogatable label attached to or implanted in the article or animal the label being constructed to be capable of receiving electromagnetic signal from a transmitter, converting the signal to a surface acoustic wave by passing the wave over a path on a label or reconverting the surface acoustic wave to an electromagnetic signal and retransmitting it to a receiver. The power of the surface acoustic wave is of a material such that the time of travel of the surface acoustic wave over the path is a function of the temperature of the path and thus of the label. The receiver is constructed to measure the time interval between electromagnetic signals produced by the passage of the surface acoustic wave pass a transducer or transducers in the path and thereby provide an output indicative of the temperature of the environment of the label. It is preferred that the label includes a plurality of transducer means at coded locations along the path arranged for retransmitting to the receiver a coded sequence of electromagnetic signals indicative of an article or animal to which the label is affixed or in which it is implanted in the manner described in U.S. Patent 3706094.
369138
Cole Peter H.
Vaughan Richard
Smart & Biggar
Unisearch Limited
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