Ariel-University Research and Development Company Ltd.

Ariel Scientific Innovations Ltd.

Boris Litvak

Moshe Einat

Alexander Shulzinger

Boris Kapilevich

Asher Yahalom

Haim Cohen

Yosef Pinhasi

Yossi Rabinovich

Avner Cahana

Ariel Etinger

The present invention describes a device and a method for grading diamonds using electromagnetic fields with a radiofrequency or terahertz frequency. The method for grading diamonds comprises placing the diamond () into a grading device, applying an electromagnetic field with a frequency range of up to 30 THz to the diamond, recording a modulated signal received from the diamond in a form of S-parameters as a function of frequency or any other parameter that can be deduced by applying said electromagnetic field, processing the recorded signal in the processing unit to obtain data containing information about either an amplitude, or phase, or both of the recorded S-parameters as a function of frequency or said any other parameter, performing calculations relating to the obtained data, and running a computer algorithm correlating the calculated data to either nitrogen concentration, boron concentration or plastic deformation in diamonds, thereby allowing grading of the diamond. The device comprises the following components, RF generator (), transmitting antenna (), waveguide (), receiving antenna (), amplitude and frequency detector () and computing unit ().

Method and device for grading diamonds using radiofrequency (RF) spectroscopy

Disclosed are passive millimeter wave detection devices that in some embodiments are useful for detecting objects such as weapons obscured underneath clothing. Also disclosed are methods for detecting objects using millimeter waves, in some embodiments, objects such as weapons, obscured underneath clothing.

Passive millimeter-wave detector

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Maale Adumim, Israel

Boris Litvak