초록 ▼

Hand-held instrument for measuring the temperature of a target without contact with the target. The instrument utilizes a microprocessor and a digital display to calculate and indicate different temperature functions. Compensation is included for the effects of emissivity and ambient temperature cha

Hand-held instrument for measuring the temperature of a target without contact with the target. The instrument utilizes a microprocessor and a digital display to calculate and indicate different temperature functions. Compensation is included for the effects of emissivity and ambient temperature changes which otherwise could result in inaccurate readings. Temperature trend direction liquid crystal arrow(s) actuated by the microprocessor are included in the display.

대표청구항 ▼

In an instrument for measuring the temperature of a target without contact with the target: an infrared detector for providing a reading in the form of an electrical signal corresponding to infrared energy impinging thereon, optical means for directing infrared energy along a predetermined optical p

In an instrument for measuring the temperature of a target without contact with the target: an infrared detector for providing a reading in the form of an electrical signal corresponding to infrared energy impinging thereon, optical means for directing infrared energy along a predetermined optical path from a target to the detector, a first temperature sensor for providing a reading in the form of an electrical signal corresponding to ambient temperature, a reference body which moves into and out of the optical path so that the detector reading corresponds alternately to the infrared energy from the target and the infrared energy from the reference body, a second temperature sensor for providing a reading in the form of an electrical signal corresponding to the temperature of the reference body, signal processing means responsive to the signals from the infrared detector and the temperature sensors for calculating the temperature of the target and providing an output signal corresponding thereto, and display means responsive to the output signal for displaying the temperature of the target, said signal processing means employing a look up table and the following relationship in calculating temperature of the target: [Figure] where NS(TS) is the radiance of a black body radiator at the temperature of the target, KG is a constant, S1 is the detector reading corresponding to the target, S2 is the detector reading corresponding to the reference body, NA(TA) is the radiance of a black body radiator at the ambient temperature measured by the first temperature sensor, NF(TF) is the radiance of a black body radiator at the reference body temperature measured by the second temerature sensor, and ES is the emissivity of the target.