Abstract: An infrared thermometer is disclosed comprising a first housing member having an interior chamber, and housing a sensor mounted within the chamber for sensing temperature change and generating an indicative electrical signal, means for directing infrared radiation from the object to be measured to the sensor, a shutter assembly for controlling the passing of infrared radiation to the sensor, an ambient temperature sensor for sensing ambient temperature within the interior chamber and generating an electrical signal indicative thereof, an electrical circuit for processing the electrical signals to calculate the temperature of the object to be measured, and an indicator for indicating the calculated temperature. A second hollow housing member operatively connected to the first housing member by a hinge.

Abstract: A noncontact active infrared sensor is provided with bifurcated sensing elements. A first element is uniquely exposed to the remote object, thereby establishing a radiative flux. A second element is configured in the same local environment as that of the first element but isolated from radiation from the remote object. The heat transfer of both elements is compared and that component of heat transfer corresponding to flux with the remote object is isolated and converted into a temperature signal. The sensor system advantageously incorporates individual thermal control units onto both sensor elements to accurately control salient thermal transfers while thermally decoupling the sensor elements. This provides for a more accurate reading of the temperature of the remote object.

Abstract: An optical infrared thermometer has a sole core, refractive rod waveguide in an optical path between the infrared reception portion of the thermometer and the infrared sensor of the thermometer.

Abstract: A sensor includes two thermal energy detectors thermally insulated from one another. The first detector is warmed or cooled by radiation between it and the object being measured. The second detector is warmed or cooled by exchange of thermal energy with a thermal reference source until the second detector reaches a temperature that is a predetermined ratio with that of the first detector. A control circuit which receives signals from the detectors that represent their temperatures, provides control for the thermal reference. A third detector measures the temperature of the thermal reference source and provides a signal representative of the temperature of the reference source. A processor receives the signal from the third detector and provides a signal indicative of the temperature of the object.

Abstract: A probe cover for an infrared thermometer has a pleated sheath which fits over the thermometer probe and a base, which is engageable with the probe, is attached to the periphery of the sheath to hold the sheath over the probe. The sheath is made of a thin infrared transparent film and is formed with a window which causes minimal attenuation of infrared emission received by the thermometer.

Abstract: A thermal radiation sensor is joined with a shutter that is adapted for reversible interruption of radiation from an object to the sensor. The shutter includes an integral electrically operated heater for maintaining a portion of the shutter at a predetermined temperature as a thermal reference for the sensor. The sensor is alternatively exposed to radiation from the object and the thermal reference portion of the shutter, and provides a first signal representative of the radiation that it receives from the object and a second signal representative of the radiation that it receives from the reference portion. An electronic circuit is connected to the sensor for receiving the first and second signals, for calculating the temperature of the object, and for providing a signal representative of the calculated temperature.

Abstract: A unitary probe cover for an infrared radiation thermometer has a frustum-shaped sheath which fits over the thermometer probe. A base, which is engageable with the probe, is formed integrally with and around the periphery of the proximal end of the sheath to hold the sheath over the probe. The sheath is made of an infrared transparent material and is formed to have a thinner distal end portion terminating in a thin window which passes infrared radiation through the probe into the thermometer.

Abstract: An electronic infrared thermometer is disclosed comprising a housing forming an interior chamber, a pyroelectric sensor mounted within the chamber for sensing temperature change and generating an indicative electrical signal, means for directing infrared radiation from the object to be measured to the pyroelectric sensor, a shutter assembly for controlling the passing of infrared radiation to the pyroelectric sensor, an ambient temperature sensor for sensing ambient temperature within the interior chamber and generating an electrical signal indicative thereof, an electrical circuit for processing the electrical signals to calculate the temperature of the object to be measured, and an indicator for indicating the calculated temperature.

Abstract: An electronic infrared thermometer is disclosed comprising a housing forming an interior chamber, a pyroelectric sensor mounted within the chamber for sensing temperature change and generating an indicative electrical signal, means for directing infrared radiation from the object to be measured to the pyroelectric sensor, a shutter assembly for controlling the passing of infrared radiation to the pyroelectric sensor, an ambient temperature sensor for sensing ambient temperature within the interior chamber and generating an electrical signal indicative thereof, an electrical circuit for processing the electrical signals to calculate the temperature of the object to be measured, and an indicator for indicating the calculated temperature.