Isotech Technology Pvt Ltd, Bangalore, achieved one more milestone in its product category, and it is the first time an Environmental chamber integrated with a Black body Radiation system in a low-temperature application for the Defence sectors /ISRO /Aerospace. Etc.
Applications of blackbody radiation. The black bodies are used in applications such as lighting, heating, security, thermal imaging, and testing and measuring. Planck’s Law of Radiation can be used to determine the intensity of energy at any temperature and wavelength.
The blackbodies are used for lighting, heating, security, thermal imaging, as well as testing and measurement applications.
Since the intensity of the energy at any temperature and wavelength can be determined using the Planck Law of radiation. A blackbody radiation source with a known temperature, or, whose temperature can be measured, is usually used for calibrating and testing the radiation thermometers.
A perfectly insulated enclosure that is in thermal equilibrium internally contains blackbody radiation and will emit it through a hole made in its wall, provided the hole is small enough to have a negligible effect on the equilibrium. The thermal radiation spontaneously emitted by many ordinary objects can be approximated as blackbody radiation.
A black body absorbs all radiation incident upon it. Thus, the black body’s Emissive power is universal and can be derived from first principles. A good example of a black body is a cavity with a small hole.
Some examples of blackbody radiators that emit visible light or whose radiation is used for other processes include electric heaters, incandescent light bulbs, stoves, the sun, the stars, night vision equipment, burglar alarms, warm-blooded animals, etc…
The blackbody law may be used to estimate the temperature of a planet orbiting the Sun. The temperature of a planet depends on several factors: Incident radiation from its star. The emitted radiation of the planet (for example, Earth’s infrared glow).
The radiation emitted by a black body in thermal equilibrium with its environment is called black-body radiation. The name “black body” is given because it absorbs all colors of light. In contrast, a white body has a “rough surface that reflects all incident rays completely and uniformly in all directions.
The temperature depends on the object under test. For example, a low-temperature blackbody is suitable for applications such as calibrating an IR sensor that looks at buildings, vehicles, or human bodies.
The Blackbody radiation sources are available in three main categories, based on the temperature range.
- Low-temperature blackbody with a range of between -40 °C to +150 °C
- High temperature extended area blackbody – from ambient temperature up to +600 °C
- High-temperature cavity blackbody – from ambient temperature up to 1200 °C
The Sun emits almost all wavelengths of electromagnetic radiation but 99% of the emitted radiation is in the ultraviolet, visible, and infrared regions. The Sun is a non ideal blackbody, emitting more radiation than expected in the X-ray and far-UV as well as the radio regions of the spectrum.
It then emits thermal radiation at its temperature in a continuous spectrum. A black body receives all the energy from the dropping waves. It releases radiations of all wavelengths when heated to the correct temperature. The mixture of both wavelengths of radiation produces white light.
As the temperature increases, the peak of the emitted blackbody radiation curve moves to higher intensities and shorter wavelengths. The blackbody radiation graph is also compared with the classical model of Rayleigh and Jeans.
- Environmental Chamber Volume: 1000 Litres to 8000 Litres
- Temperature Range: -70° C to +200°C.
- Black Body Absolute Temp. Range -40°C to +150°C
- Differential Temp. Range: -65°C to +125°C
- Uniformity: ±0.010°C
- Set point & read out resolution: 0.001°C
- Differential Accuracy: ° C 0.020 @ -20 < Tamb < 80,0.040 @ Tamb < -20
- Stability: °C 0.005 @ ▲ T<10, 0.01 @ ▲ T>10
- Emissivity: 0.98 ± 0.01
- Settling Time: Less than or equal to 30 sec.
- Head Size: ≤400(H) X 450(W) X 250(D) mm
- Head Weight: 25 Kg ± 5%
Color of a black body from 800 K to 12200 K. This range of colors approximates the range of colors of stars of different temperatures, as seen or photographed in the night sky.