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  • Introduction to Thermopile Detectors
    Dexter Research Center is a leader in the manufacture of stable, high quality, high output radiation sensing thermopile detectors with a linear dynamic range from the UV to long wave IR. Thermopile detectors are passive radiation sensing voltage-generating devices, that require no bias or cooling
  • Thermopile Time Constant Determination
    The time constant of thermopile detectors can be determined by several methods depending on the specific waveform of the radiation used to excite the detector. If the detector is subject to a step function of radiation, its response follows the function below.
  • Effects of Encapsulation Gas on Thermopile Detectors
    The selection of encapsulating gas in a thermopile detector package affects four important performance parameters: the output voltage, responsivity, signal-to-noise ratio (SNR) and time constant. Different gases have different molecular thermal conductivity. The molecular thermal conductivity
  • Thermistor Options
    To make a radiometric measurement with thermopile detectors, you will need to approximate the thermopile's cold junction temperature. Dexter offers optional externally mounted thermistors for all models as well as internally mounted thermistors on several of our models.
  • A Simple DC Radiometer
    One of many applications of the thermopile detector is the remote measurement of temperature. In this Application brief we explain the basic principles of remote temperature measurement. Every object at temperature T (above absolute zero - 273.15 C) emits electro-magnetic radiation. The total
  • Variations in Calibrations of Radiometers Using Cut-on Optical Filters
    The spectral bandpass of infrared radiometers using thermopile detectors are often controlled with a 6 um cut-on filter. These filters normally have a cut-on tolerance of +1 um and the cut-off wavelengths are determined by the substrate transmission, which is usually germanium or silicon
  • Temperature Compensation of a DC Radiometer
    The thin film thermopile detector like its forefather, the wire thermocouple, requires either a reference junction temperature measurement or a constant temperature sink for its reference junction. The later is usually difficult to implement in an instrument because of size and weight requirements

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