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Home Sensors Thermoelectric pyro-geliometer for measuring solar constant

Thermoelectric pyro-geliometer for measuring solar constant


Basic error of measurement over the range of 80-2500 W/m2, % , –––––––– + 0,1
Reproducibility of measurement results at the level of solar constant, % , –– + 0,04
Time constant, s , ––––––––––––––––––––––––––––––––––––––––––––––– 1
Time of reading the indications up to 0,05 % of the amplitude value, s , –––– 10

Dimensions of extermal case pyrheliometer (without places of fastening):
- diameter, mm ,120
- heights ( without aperture pipe), mm ,110
- heights ( with aperture pipe ), mm ,300
Total weight, kg , 2,8

Innovative Aspect and Main Advantages

The highest measurement precision is attained due to:

  • Provision of the isothermal mode of cavity calorimetric receiving element and a system of aperture diaphragms by means of special thermoelectric heating/cooling systems;
  • Utilization of high-precision multi-element differential thermopiles made of optimized semiconductor thermoelectric material. The thermopile provides constant conversion coefficient over the temperature range of -40oC ~ +40oC;
  • Utilization of absolutely black body as a receiving collector of cavity model, with a special-shaped mirror reflector mounted inside the cavity at the point of initial incidence of solar radiation beam;
  • Provision during calibration of the equivalency of replacement of solar radiation thermal effect with the electric calibrator thermal effect;
  • Utilization of stable blackening coatings on the internal surface of receiving cavity with their reflection factor characterized by predominantly mirror component;
  • Utilization in the creation of pyro-geliometer of design principles successfully tested in the development of microcalorimeters with the resolution of 10-8W.

Areas of Application

The pyro-geliometer is intended for the absolute measurement of direct solar radiation with the highest precision.

The pyro-geliometer can be used for the measurement of solar constant both under terrestrial and space flight conditions (as part of meteorological satellites, space stations).

The pyro-geliometer can be used as a meteorological means to provide precise measurement of short-wave and long-wave solar spectrum parts, scattered solar radiation, etc.

Stage of Development

Prototype available for testing. License agreements and cooperation the further development are sought.

Contact Details

Organization: Institute of Thermoelectricity
Contact person: Lavska Lyudmyla
Address: General Post-Office, Box 86, Chernivtsi, 58002, Ukraine
Теl: (3803722) 7 58 60
Fax: (3803722) 41917
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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