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Domain-engineered pyroelectric radiometer.

J Lehman1, G Eppeldauer, J A Aust

  • 1Optoelectronics Division, National Institute of Standards and Technology, Boulder, Colorado 80303, USA. lehman@boulder.nist.gov

Applied Optics
|March 8, 2008
PubMed
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A new pyroelectric radiometer was developed for infrared measurements. This advanced detector offers high uniformity and reduced acoustic sensitivity, establishing it as a primary transfer standard.

Area of Science:

  • Infrared Metrology
  • Pyroelectric Detectors
  • Optical Sensing

Background:

  • Accurate measurements in the near- and mid-infrared regions are crucial for various scientific and industrial applications.
  • Existing pyroelectric detectors often face challenges with spatial uniformity and acoustic sensitivity.

Purpose of the Study:

  • To develop a large-area domain-engineered pyroelectric radiometer.
  • To achieve high spatial and spectral response uniformity for infrared measurements.
  • To establish a primary transfer standard for the near- and mid-infrared wavelength regions.

Main Methods:

  • Domain engineering by inverting spontaneous polarization in a lithium niobate (LiNbO3) plate.
  • Application of gold black as an optical absorber.

Related Experiment Videos

  • Incorporation of an aperture to define the detector area.
  • Evaluation of acoustic sensitivity, optical sensitivity, and noise equivalent power.

    • Main Results:

    • Achieved high spatial response uniformity (<0.1% variation across a 7.5-mm aperture).
    • Demonstrated spectral uniformity of the gold black coating within 2% from 800 to 1800 nm.
    • Significantly reduced acoustic sensitivity without compromising optical sensitivity.
    • Observed a nearly constant noise equivalent power across different acoustic backgrounds.

    Conclusions:

    • The developed domain-engineered pyroelectric radiometer serves as an excellent primary transfer standard for infrared measurements.
    • The detector exhibits superior spatial and spectral uniformity, making it reliable for precise metrology.
    • The method effectively mitigates acoustic interference, enhancing measurement stability.