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SAR Measurement System
eoProbe  Kapteos Logo  Made In France 


Since ultra compact and interference-free electric-field probes allow vector measurement inside biological media, KAPTEOS solution meets specific absorption rate measurement needs for public exposure to electromagnetic fields, especially inside phantoms.  




The Specific Absorption Rate (SAR) assessment measures the exposition of electric fields on people. These measurements are based on standards and must be performed inside a phantom (this is a new European directive). The Kapteos eoProbe can be used in any liquids and complies with this new directive.

Example of specific projects:

 Measuring infantrymen exposure to electric fields from military communication antennas

pdf Application Note: Specific Absorption Rate Assessment


The exposition of people to electromagnetic fields is an historical concern. Electromagnetic fields are generated by a wide variety of systems and the emitted electrical fields have a broad frequency range (from kHz to GHz). The object of a Specific Absorption Rate Assessment is to perform measurements in accordance with standards requiring in-situ electric field in a biological medium.


Kapteos SAR Head 

 An example would be the SAR of a mobile phone


Existing technical E-field measurement solutions

There are 2 different technologies available on the market today:

 To measure the elevation of temperature inside the phantom in various places

 To measure the electric field based on antenna probes inside the phantom in various places


Proposed solution by Kapteos

The Kapteos eoProbe and eoSense electro-optic solution offers the best possible measurement system due to:

 A non-perturbative measurement (no metal parts in the eoProbe)
 A very compact design (5 mm * 35 mm)
 A very small spatial resolution (< 1 mm)
 An ultra-wide band frequency
 An operating temperature from 0 to +50°C for the probe
 The vector measurement of the E- field with excellent rejection ratio of an axis of the field to another (> 50 dB). The measured information is very comprehensive and accurate.


Targeted markets

Any manufacturer producing systems that emit electrical fields due to the transport ion of data or energy:



 Mobile phones


 Communication protocols (Wifi, Bluetooth, RFID…)

 Wireless energy charging systems

 Induction furnaces

 Transport of energy


Customer advantages of using Kapteos solution

 One system that perfectly meets the standards for frequencies from 100kHz to 40GHz

 It allows the measurement of a field vector (amplitude, phase, spectrum, vector direction)


Kapteos references

 Several publications with the XLIM research institute (France)

 Tübingen Clinic (Germany).

 Infantrymen exposure to electric fields from military communication antennas (France).


Specific Absorption Rate Assessment Using Simultaneous Electric Field and Temperature Measurements

Antennas and Wireless Propagation Letters

XLIM, Limoges (FR)

IMEP-LAHC, Le Bourget-du-Lac (FR)

Kapteos, Sainte-Hélène-du-Lac (FR)

Boston University, Boston (US)


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