...

The 2x1 sensor geometry was tested with microscopic measurement. Two slides from Chris Kenney's presentation shows the pixel sizes:

The same presentation in PDF format: Pixels size

Important 2x1 features:

• Number of rows x columns in 2x1 (as defined in DAQ) = 185 x 388.
• Most of pixels have size 109.92 x 109.92 um*um.
• Gap between two ASICS is covered by the two rows of elongated pixels with size 109.92 x 274.8 um*um.
• Two versions of sensors have different dimensions between corners, so it is reasonable to define pixel coordinates w.r.t. the sensor center.

Optical measurement

Optical measurement is maintained by Chris Kenney. Detector or its quad is installed on microscope table and 3-d coordinates of all 2x1 sensor corners are measured with precision about 8um (RMS) in x-y plane. All corners in the measurement are numerated in arbitrary order. This order does not coincide with numeration of 2x1 in DAQ, as shown on plots below. It is expected that numeration order should be the same for different measurements. This procedure depends on CSPAD construction;

...