CPC G01J 5/0025 (2013.01) [G01J 5/026 (2013.01); G01J 5/03 (2022.01); G01J 5/0806 (2013.01); G01J 5/0853 (2013.01)] | 20 Claims |
1. A device for monitoring a heat source, the device comprising:
(i) one or more zero power infrared (IR) sensors, each sensor comprising a first plasmonic absorber tuned to a selected wavelength range of IR radiation and comprising a switch actuatable using only energy of IR radiation absorbed by the plasmonic absorber; wherein the one or more zero power IR sensors are disposed within a circuit in series or in parallel, and wherein the circuit is interruptable by the switch of each sensor;
(ii) a transmitter disposed within the circuit and activatable by a selected configuration of said switches; and
(iii) optionally a battery disposed within the circuit, the battery capable of powering the transmitter;
wherein absorption by the one or more sensors of selected wavelengths of IR radiation originating from the heat source and characteristic of a heat emission from the source causes the transmitter to transmit an electromagnetic radiation signal.
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