Abstract: An infrared sensor calibration system including a calibration body at a known temperature a fixture for a package with at least two infrared sensors each aimed at a different location on the calibration body. Relative motion is provided between the calibration body and the fixture so each infrared sensor is immune to temperature variations across the calibration body during calibration of the infrared sensors.

Abstract: An oxygen analyzer system includes first and second internally calibrated sensors each for detecting oxygen levels, and a processing subsystem responsive to the sensors. The processor is configured to calibrate the first sensor while the second sensor detects oxygen levels, and to calibrate the second sensor while the first sensor detects oxygen levels. The processor is further configured to compare the oxygen level detected by the first internally calibrated oxygen sensor and the oxygen level detected by the second internally calibrated oxygen sensor, to output an error signal if the oxygen levels detected by the first internally calibrated sensor differ from the oxygen level detected by the second internally calibrated oxygen sensor by a predetermined amount, and to output the oxygen level detected by either the first or second internally calibrated oxygen sensor if the oxygen levels detected thereby do not differ by a predetermined amount.

Abstract: An infra-red temperature sensor for sensing the temperature of a medium includes a housing; a thermal infra-red sensor element having a predetermined field of view and disposed in the housing; and a diaphragm closing the housing spaced along an axis from and in the field of view of the thermal sensor element for absorbing on its outer surface heat from the medium and emitting radiation from its inner surface to the thermal sensor element representative of the temperature of the medium.

Abstract: An oxygen analyzer system includes first and second internally calibrated sensors each for detecting oxygen levels, and a processing subsystem responsive to the sensors. The processor is configured to calibrate the first sensor while the second sensor detects oxygen levels, and to calibrate the second sensor while the first sensor detects oxygen levels. The processor is further configured to compare the oxygen level detected by the first internally calibrated oxygen sensor and the oxygen level detected by the second internally calibrated oxygen sensor, to output an error signal if the oxygen levels detected by the first internally calibrated sensor differ from the oxygen level detected by the second internally calibrated oxygen sensor by a predetermined amount, and to output the oxygen level detected by either the first or second internally calibrated oxygen sensor if the oxygen levels detected thereby do not differ by a predetermined amount.

Abstract: An infrared sensor calibration system including a calibration body at a known temperature a fixture for a package with at least two infrared sensors each aimed at a different location on the calibration body. Relative motion is provided between the calibration body and the fixture so each infrared sensor is immune to temperature variations across the calibration body during calibration of the infrared sensor.

Abstract: A method of making a radiation sensor wherein a plurality of thermopiles are formed on one wafer and a plurality of packages for the thermopiles are formed in another wafer. Each package includes a formed well covered by a window. The two wafers are bonded in a controlled gas or vacuum environment such that each thermopile resides in the well below the window of a package.

Abstract: A thermal detection device having hot and cold regions, first and second thermocouples disposed across the hot and cold regions each with terminals at the cold region, a thermal absorber disposed at the hot region and in thermal communication with the first and second thermocouples, and a base header having a support surface and a non-support surface. A portion of the support surface opposes a portion of the cold region, and a portion of the non-support surface opposes a portion of the hot region. The second thermocouple has a polarity opposite to the polarity of the first thermocouple.

Abstract: A thermistor probe with improved heat transfer between the housing and the thermistor element is provided which includes a housing which is adapted to be disposed in an environment with a temperature to be measured by the probe. Within the housing is a thermally conductive insert which corresponds to a cavity within the housing. The insert has an aperture with a generally rectangular cross section to receive a thermistor disk. The thermistor disk has a positive or negative temperature coefficient of electrical resistance. The generally rectangular aperture is constructed such that the thermistor disk can be inserted into the aperture in a close fitting relationship with the aperture. While the entire outer surface of the thermistor disk may not be in contact with the walls of the aperture in the insert, the heat transfer between the housing and the thermistor disk (through the insert) is greatly improved over thermistor probes of the past.