Patent ID: 9470580
Filing Date: 2016-10-18
CPC Classification: G01J

Claim Text:
1. An infrared sensor comprising: a thermopile for producing a voltage as a function of temperature of a point of interest; a resistance temperature detector (RTD) that varies in resistance as a function of ambient temperature, the RTD connected in a series circuit with the thermopile; first and second leads connected to a first RTD terminal of the RTD; a third lead connected to a second RTD terminal of the RTD and a first terminal of the thermopile; and a fourth lead connected to a second terminal of the thermopile, wherein the second and third leads are configured to provide an excitation current to and from the RTD, and wherein the first and fourth leads are configured to provide an electrical path so that a voltage across the series circuit can be measured without electrically conducting the excitation current through the first and fourth leads.