OPT8241: OPT8241 Phase data abnormal

Eric Chen27

Intellectual 470 points

Part Number: OPT8241

Hi TI,

There are different phase when I use different focal lens with the same light source(VCSEL).

Could you explain why?

How can I adjust to make both consistent?

(top is 2.8mm lens, bottom is 3.6mm lens)

Regards,

Eric

over 8 years ago

0 Larry Li over 8 years ago

TI__Expert 3495 points

Eric, whenever a lens is changed, F number will vary and impact the amount of light captured by the imaging sensor, which in turn will create different common phase offset, hence your observed difference. When you change lens, you should redo at least lens calibration and common phase calibration.

0 Subhash Chandra Sadhu over 8 years ago

TI__Expert 3800 points

Eric,

To compare phase values, it is a good idea to rely on actual phase numbers rather than the color map. Can you compare the actual phase numbers for the same point at different places in the scene?
Also, it helps to have an RGB picture of the scene. Are the Red/Blue lines in the scene very dark?

Regards,
Subhash

0 Eric Chen27 over 8 years ago in reply to Subhash Chandra Sadhu

Intellectual 470 points

Yes, the Red/Blue lines are very dark in the scene. (as below picture.)

0 Subhash Chandra Sadhu over 8 years ago in reply to Eric Chen27

TI__Expert 3800 points

Eric,

Can you compare phases in the bright regions in the scene?

Regards,
Subhash

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OPT8241: OPT8241 Phase data abnormal