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RMV Operations Manual Revision Copyright illunis LLC, 2014
Page 95
6.9: Image Detectors
Exposure Time Detector
Exposure Time
of the RMV camera is meas-
ured with a very high resolution counter circuit. The
counter contents are cleared on the electronic erasure
pulse and saved on the photo diode transfer pulse. The
count resolution is the pixel clock so a very accurate
measurement of the exposure can be made.
Quick FAQ’s:
►Temperature is read in degrees Celsius.
►Temperature accuracy is 0.5 degrees.
Quick FAQ’s:
►Exposure is measure in pixel clock periods
For a 40Mhz clock the period is 0.025us
For a 30Mhz clock the period is 0.033us
►The maximum count is 4294967295 (0xFFFFFFFF)
For a 40Mhz clock the maximum is 107 seconds
For a 30Mhz clock the maximum is 143 seconds
Trigger
Transfer Pulse
Strobe
SUB (Erase)
Exposure
Exposure counter is
cleared and count begins
Exposure counter is
saved and count ends
Serial Commands
Target
Index
Command
R/W Description
04
0x27
Camera Exposure
R
0x12 = Low Word (2 bytes)
0x13 = High Word (2 bytes)