Ramot University Authority for Applied Research and Industrial Development Limited

Ben-gurion University of the Negev Research and Development Authority

Ramot University Authority for Applied Research and Industrial

Ady Seidman

Jan Grinberg

Benjamin Sheinfux

Zohar Avrahami

Uri Shimoni

Nadav Bar-Chaim

Eliezer Wiener-Avnear

A system and method are described for the real-time conversion of a two-cr optical input into coherent light of two colors. The system includes a first electrooptic device oriented to receive the optical input, the device having applied thereto a periodic voltage producing an electrical field periodically varying between magnitudes effective to block one or the other color of the optical input. The system further includes a second electrooptic device oriented to produce coherent light of two colors, this device having applied thereto a second periodic voltage in synchronization with the first-mentioned voltage to produce an electrical field periodically varying between magnitudes effective to block one or the other color of the coherent light source. A gate applies the second periodic voltage to the second electrooptic device only when light of either of the two colors is outputted by the first electrooptic device.

System and method for the real-time conversion of two-color incoherent

A channel electron multiplier is described having a tubular wall coated w a secondary-electron emitting material and including an electric field for accelerating the electrons, the electric field comprising a plurality of low-resistive conductive rings each alternating with a high-resistive insulating ring. The thickness of the low-resistive rings is many times larger than that of the high-resistive rings, being in the order of tens of microns for the low-resistive rings and at least one order of magnitude lower for the high-resistive rings; and the diameter of the channel tubular walls is also many times larger than the thickness of the high-resistive rings. Both single-channel and multiple-channel electron multipliers are described. A very important advantage, particularly in making multiple-channel multipliers, is the simplicity of the procedure that may be used in constructing such multipliers. Other operational advantages are described.

Channel electron multipliers

A gamma-ray camera is described including a collimator receiving and collimating the gamma rays, a converter matrix converting the gamma rays to electrons, an electron-image multiplier receiving the electrons and producing a multiplied electron output, and means for reading out the output of the electron-image multiplier. A converter matrix is described for converting gamma-rays to electrons comprising a metal plate emitting electrons upon being impinged by gamma-photons, the metal plate having a face formed with a plurality of spaced parallel surfaces which extend substantially parallel to the direction of the gamma-rays. Also described is a converter matrix of scintillation crystals, one face of each crystal including a photo-sensitive coating, the opposite face of each crystal being clear, the remaining faces of each crystal being coated with a light-reflecting coating.

Gamma-ray camera including novel converter matrix useful therein

Growing community of inventors

Tel Aviv, Israel

Ady Seidman