N10

Exposure Time Limitations

The camera comes with diffuse and structured light sources operating at 850nm wave length. Both share a common current limit of approximately 200mA on average. This ensures that the LEDs stay inside their specified power limits, also when using only one of the two LEDs. Each LED is powered by a constant 2A current during exposure, backed by capacitors.

Including all losses in current sources and wires, the capacitors can power one LED with constant current for an exposure time of 7ms at 10Hz frame rate. In order to achieve constant illumination conditions, this limit should not be exceeded. Otherwise the image brightness will vary with the delays between image captures and the sensitivity to extraneous light will increase.

Note

When increasing the frame rate by a factor of k, the exposure must be divided by k accordingly to not exceed the current limit. (e.g. 3.5ms at 20Hz ).