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Sensors exposure times

CMOS sensors

Most of CMOS sensors generate the exposure interval internally.
For few it is possible to control it by external signaling.
The sensor internal timing depends on provided system clock.
Most of sensors are using dividers to generate slower clocks for internal state machines.

The exposure time is mostly defined by number of row times, where the row time is dependent on various internal settings.
Almost none of them supports exposure time equal to zero.
There is defined minimal exposure time as well as steps between possible exposure times.


SENSOR Min. exposure Exposure step Max. exposure Note
e2V
EV76C560
15.625us 15.625us 10s
CMOSIS CMV300 54 us 7.4us 1s defined for max. bandwidth (1)
CMOSIS CMV2000 15.32us 2.69us 1s defined for max. bandwidth and 8bit per pixel. For more bits the values will double (1)
CMOSIS CMV4000 25.8us 2.69us 1s defined for max. bandwidth and 8bit per pixel. For more bits the values will double (1)
On Semi VITA1300 73us 1us 1s step 1us if exp < 65.54ms; 4us if exp<262.1ms; 16us otherwise
On Semi PYTHON1300 29us 1us 1s step 1us if exp < 65.54ms; 4us if exp<262.1ms; 16us otherwise
Aptina MT9V034 10.83us 0.042us 10s
Aptina MT9P031 (Currera) 36.38us 36.38us 10s full resolution (2)
Aptina MT9P031 (MU9P) 110us
1ms
110us
110us
10s
10s
full resolution in Rolling Shutter mode(2)
full in Global Reset Release mode(2)

(1) - By decreasing bandwidth the minimum exposure time and exposure step will increase

(2) - Decreasing the width of the image and the use of downsampling further decreases the value of the minimum exposure time.

CCD sensors

Maximum Exposure Times

Following table shows maximum exposure times in minutes for different camera models and different modes:

readout freq 26/52MHz 65MHz
model\readout mode 2/4 TAP 1 TAP 2/4 TAP 1 TAP
MD028 (Sony ICX674) 6.54 11.88 5.24 9.51
MD061 (Sony ICX694) 8.71 16.24 6.98 13
MD091 (Sony ICX814) 10.4 19.62 8.34 15.69
MD120 (Sony ICX834) 12.69 24.18 10.16 19.35

Minimum Exposure Times

Triggered Modes

All triggered modes have minimum possible exposure time 26 micro seconds.

Not Triggered Modes

If camera frame is not triggered by hardware or software, the minimum exposure time is different for different models and modes.

Following table shows minimum exposure times in micro seconds for different camera models and different modes:

readout freq 26/52MHz 65MHz
model\readout mode 2/4 TAP 1 TAP 2/4 TAP 1 TAP
MD028 (Sony ICX674) 47 66 43 58
MD061 (Sony ICX694) 54 82 49 71
MD091 (Sony ICX814) 61 94 54 80
MD120 (Sony ICX834) 69 110 60 94