Hello everyone,

I've been working with an EVK3 as part of my PHD thesis. In order to quantify the effect that the on and off biases have on the response of the camera, I have set up a simple experiment that uses the camera to measure responses to a pulsing laser (frequency unknown). I plotted the events per second against the threshold for both positive and negative responses. The positive response curve is mostly consistent with what I'd expect. The events remain close to the noise floor and then grow exponentially below a certain bias level until the camera eventually becomes unresponsive, below approximately a threshold of 280.

On the other hand, the negative events are more unpredictable. While there's some linearity between 120 and 230, the events become more sporadic above that range. Interestingly, the camera became unresponsive at a threshold of 375 for negative events, contrasting the wider dynamic range observed in positive responses.

Here are the plots for reference:

Additional Notes:

The ROI was set prior to recording the events to a size of 10x10 pixels

Bias safety override was enabled for this experiment

The events were sampled for 1 second at each bias

Biases were in the range (0, 380) with step size +5 for the negative chart
Biases were in the range (1800, 250) with step size -5 for the positive chart

I'm trying to understand the root cause of these discrepancies:

Is it possible that the hardware is inherently more sensitive to negative events?

Could the source being imaged or ambient conditions play a significant role in these variations?

Are there any other factors or considerations I might be overlooking?

Any insights or suggestions would be greatly appreciated. Thanks in advance for your time and expertise!