CNRS Technologies

Find the best CNRS technologies to boost your innovative project.

Newest patents

You are a research scientist?

We can guide you through the whole technology transfer process.

See all our services

You are a corporate player?

Thanks to our expertise, our network and our know-how of the innovation ecosystem, we support you throughout your project.

Contact us

Follow our news and upcoming events

Discover CNRS technologies

Meet our team

Close

Switchable directional infrared radiation source

Reference

05425-02

Patents status

French priority patent application filed on November the 30th, 2012 and entitled “Source de rayonnement infrarouge directionnelle commutable.”

Inventors

Philippe BEN-ABDALLAH
Henri BENISTY
Mondher BESBES
Anne-Lise COURTOT

commercial status

Exclusive or non-exclusive license

Laboratory

Laboratoire Charles Fabry (LCF, UMR 8501, in Palaiseau, France

Description

CONTEXT

Based on the thin film coating and structuring of metal oxides, this innovation can provide a directive IR emission with radiation rate control.

TECHNICAL DESCRIPTION

This novel infrared (thermal) source is composed from periodically patterned MIT (Metal Insulator Transition) material with a crystalline and amorphous phase. These two phases allow two functioning modes:

  • Emission off : non emissive state or low emissive state (Figure (a))

  • Emission on: directional with high emissivity state (Figure (b) and Figure (b’))

The necessary time to switch from one functioning mode to another is around one microsecond.
This infrared (heating) source allows :

  • For a given angle, low range infrared emission spectra in which the mean frequency could be easily controlled by changing the period of surface grating cf Figure (b) and Figure (b’).

  • For a given wavelength, the emission angle could be easily controlled through the period of surface grating cf Figure (b) and Figure (b’).

  • Reversible microsecond switching from one functioning mode to another. This functionality could be used to control the heat transfer and radiation rate.

    Figure : TM-polarized emissivity of the VO2-source in (a) its purely crystalline (dark blue) non-emittingphase and (b) in its hybrid (crystalline-amorphous) phase where the amorphous phase forms a surface grating of period P = 4.5 μm (10 unit cells of 450 nm length each) (b’) in its hybrid (crystalline-amorphous) phase where the amorphous phase forms a surface grating of period P = 5.4 μm (12 unit cells of 450 nm length each). The inset shows the structure of one period of the source and its emission pattern at 8.5 μm.

    DEVELOPMENT STAGE

    Promising results were obtained using computer simulation. No difficulties of production were pointed out. A demonstrator could be provided during the first semester of 2015.

    BENEFITS

    This source allows to:

  • Control the radiation rate
  • Directive radiation for a given wavelength
  • Changing the emission wavelength for a given angle
  • Changing the angle of emission for a given wavelengt

    INDUSTRIAL APPLICATIONS

    By coating and structuring the surface of heat sources the IR emission of these surfaces can be controlled. Applications such as heat management in satellites and flip-chip/ 3D packaging are possible. For these applications, better heat management can open the possibility for a more compact integration.

    This invention could possibly have an application for other applications such as :

  • active thermal management of electronic systems,

  • smart heating technologies (household heaters….),

  • industrial process control for chemistry and welding (plastic),

  • in the food processing industry (ovens, drying, Freeze-drying…),

  • infrared source for gas spectroscopy analyses and

  • infrared source.

    For further information, please contact us (Ref 05425-02)        

Need further information ?

Contact us
Close

Contact us

  • This field is for validation purposes and should be left unchanged.
Close

Newest patents