TPAC1.1 Testing JC/Feb 6th. Laser Scan: Test Pixel Test pixels were mounted specially in centre of pcb hole 2um spot 4um steps 50 measurements/pt  Before:

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Presentation transcript:

TPAC1.1 Testing JC/Feb 6th

Laser Scan: Test Pixel Test pixels were mounted specially in centre of pcb hole 2um spot 4um steps 50 measurements/pt  Before: Effect hasn’t entirely disappeared! Should repeat with aluminium plate removed and check alignment etc

Laser Scan: Repeated! Removed aluminium back plate Black plastic under sensor Next: Rotate sensor 90˚ Repeat

TU calibration Method – Fire laser at ~centre of (v1.1) test pixel – Set fixed threshold for test pixel – Adjust laser intensity Record mean signal magnitude – can adjust aperture or intensity to get larger signals Record probability of hit from scope (>300 samples) Plot s-curve of p(hit) against signal magnitude Estimate p(hit)=0.5 for each threshold setting Plot TU versus signal magnitude Repeat for several sensors…

TU calibration plot: all data

TU calibration plot: refined method 0.4mV/TU 0.5mV/TU