Dec 2014 T&M

No compromise on performance in vacuum chamber

HGH Infrared Systems has provided vacuum blackbodies to space agencies and laboratories, to calibrate and test IR sensors of space instruments. For that kind of application, the infrared reference sources have to combine performance of traditional blackbodies with specific features in order to operate in vacuum chamber. To meet the required high level of performance to be measured, special developments have to be made on an extended area blackbody to maintain temperature stability better than 20 mK despite the demanding testing conditions. In addition, a cavity blackbody with an emissivity of 0.999 was necessary to assess the SCARAB instrument from the French-Indian MEGHA-TROPIQUES satellite. To learn more about these projects and find out how we were able to meet such demanding requirements, surpassing the accuracy of usual test tools, please download the paper presented at the SPIE Remote Sensing 2014 conference. The vacuum blackbodies brochure can be found here.

Blackbodies with the widest temperature range

For 30 years, HGH has designed and manufactured infrared reference sources, for all applications of infrared sensor characterization.
The range includes:

These reference sources combine high-end features:

  • broad temperature range, from -40°C to 1300°C
  • high emissivity, up to 0.99, on whole infrared spectral bands,
  • high angular and spatial uniformity,
  • high stability, down to ±0.002°C.

HGH has developed two methods to improve the temperature range of its blackbodies to speed up the cooling/ heating time and to improve the power efficiency of the blackbodies. To learn more about these innovations, please download the paper presented at QIRT 2014 conference.

Blackbody portfolio with the widest temperature range

Thanks to these developments, HGH can provide all the necessary equipment to assess IR systems with the best reliability on the widest temperature range.

Mastering the full characteristics of IRFPA with BIRD test bench

The full characterization of dense focal plane arrays, with an ever increasing number of pixels, lower dot pitches, and wider spectral ranges, can quickly become very difficult. It requires the implementation of ultra-low noise driving electronics and presenting high quality optical stimuli to the detector under test.

As a global provider of high-end IR sensors, integrating by itself state-of-the-art multi-element detectors, HGH knows the challenges of testing these detector arrays. Based on this experience, HGH has developed the BIRD210 test bench to automate the measurements for the main characteristics of IRFPA. HGH is the only company to successfully manufacture and assemble all of the required technologies in-house: the optical bench with high-performance IR blackbodies and visible reference sources, and the electronic cabinet equipped with a set of ultra-low noise electronics, including a clock signal generator, a bias voltage unit and a high frequency analog to digital converter.

BIRD test bench

The BIRD 210 provides in-depth and accurate measurement results:

  • Noise tests: fixed pattern noise, temporal noise, NETD, responsivity, detectivity, 3D-noise, 2D-detectivity, including the exclusive noise and responsivity optimization as a function of the bias voltage values,
  • Dynamic range, linearity,
  • Non-uniformity correction,
  • Bad pixel localization,
  • Spectral response,
  • Crosstalk, MTF.

To download BIRD datasheet, follow this link.