NIKHEF
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 RasNik

Rasnik (copyright) is a wide range, high precision alignment monitoring system, developed at NIKHEF.

The basic idea is to create an image of a coded mask on a CMOS sensor by means of a lens. The mask is lit by infrared LEDs. A diffuser is used to minimize effects of imperfections of the light source. In this set up the relative position in X and Y direction is measured along the line mask, optical center of the lens and the CMOS sensor. Also (relative) rotation of the mask or the sensor can be measured. By calculating the actual image spot size and comparing this with the mask spot size, the position of the lens along the Z-axis can be calculated. Also the relative rotation around the X, Y and Z-axis of the mask in respect to the CMOS sensor can be calculated.
The standard video signal from the CMOS sensor is digitized by means of a frame grabber.
The system has a measurement range of several cm's with an absolute accuracy of less than 1 micron.

RasNik system


 
ATLAS RasMux
The ATLAS RasNik system
RasMux proto
ATLAS prototype system
obsolete mux
Before ATLAS
Up to eight RasCams can be connected (RJ45). There are 8 drivers for RasLeds, each having two output connectors (RJ11). Dimensions: 80 * 225 * ~45 mm. Control through COM-port. Up to eight RasCams can be connected (RJ45) and 12 RasLeds (RJ11). Control from LPT port via MasterBrico. The so-called demo kit. A scalable system, up to 32 channels (obsolete).

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updated: may 2002