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Tunable transportable spectroradiometer based on an acousto-optical tunable filter: Development and optical

O Kozlova1, A Sadouni1, D Truong1

  • 1Laboratoire Commun de Métrologie LNE-CNAM, 93210 La Plaine, Saint-Denis, France.

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A versatile spectroradiometer using an acousto-optical tunable filter (AOTF) precisely measures thermodynamic temperature. This high-performance instrument offers stable, rapid wavelength control for metrology and industrial thermometry applications.

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Area of Science:

  • Optical Engineering
  • Metrology
  • Spectroscopy

Background:

  • Accurate thermodynamic temperature determination is crucial for scientific and industrial applications.
  • Existing spectroradiometers face challenges with stray light and precise wavelength control.
  • Black body temperature measurements above the silver freezing point require specialized instrumentation.

Purpose of the Study:

  • To develop a high-performance, transportable spectroradiometer for precise thermodynamic temperature metrology.
  • To enable accurate non-contact thermometry for materials with varying emissivity.
  • To overcome limitations of existing instruments regarding stray light and wavelength stability.

Main Methods:

  • Utilized an acousto-optical tunable filter (AOTF) for rapid and continuous wavelength tuning (650 nm-1000 nm).
  • Implemented a double-pass configuration to effectively attenuate diffraction side lobes and stray light.
  • Calibrated instrument tunability using an Argon spectral lamp and characterized spectral responsivity via two complementary methods.

Main Results:

  • Achieved high relative signal stability (few 10⁻⁴) and excellent wavelength stability (1 pm) over several hours.
  • Demonstrated reproducible wavelength calibration within 10 pm over one week.
  • Validated the instrument's capability for thermodynamic temperature determination and multispectral thermometry.

Conclusions:

  • The developed AOTF-based spectroradiometer is a versatile and high-performance instrument for precise temperature metrology.
  • Its design effectively minimizes stray light, enhancing measurement accuracy.
  • The instrument is suitable for both fundamental thermodynamic temperature research and industrial non-contact thermometry.