• State
  • Locked Locked
  • Replies 7 replies
  • Subscribers 31 subscribers
  • Views 422 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

OPT3101: Phase and amplitude changes when the material target changes

Daniel Meneses
Prodigy 30 points
Part Number: OPT3101

Hi!

I have a problem with phase and amplitude when the material target changes. The sistem that I use is like this.


The OPT design is custtom design but it was previously calibrated and set to maximum current on HDR1 TX1.

When the target changes, phase and amplitude changes as is shown below.

This is the data set.

Phase, Amplitude
3367, 94
3322, 95
3344, 95
3381, 96
3453, 97
3518, 98
3589, 102
3637, 108
3698, 117
3738, 127
3800, 134
3837, 136
3875, 136
3900, 137
3879, 137
3843, 136
3832, 136
3807, 138
3802, 139
3814, 138
3655, 133
3358, 122
2872, 110
2340, 97
1840, 86
1427, 78
1164, 72
964, 67
842, 64
753, 61
677, 61
634, 61
651, 62
661, 63
790, 64

What is the problem with the signals? Is it normal?

Thank you!

  • 0
    TI__Intellectual 1070 points

    Hello Daniel,

    Will you share the target characteristics? Color, material, etc?

    Rahland

  • 0 in reply to Rahland Gordon
    Prodigy 30 points

    Hello Rahland!

    The target 1 is polished white granite and the Target 2 is smooth gray concrete.

  • 0 in reply to Daniel Meneses
    TI__Intellectual 1070 points

    Hello Daniel,

    Just for clarification, the targets are moving and being sensed at the same distance as each other?

    Rahland

  • 0 in reply to Rahland Gordon
    Prodigy 30 points

    Hello!

    The OPT system is moving and the targets are at the same distance, like the targets were a floor.

  • 0 in reply to Daniel Meneses
    TI__Intellectual 1070 points

    Hi Daniel,

    Amplitude readings are pretty low in this data. What hardware are you testing on - is this an EVM? Is the target very far away? What is size of the target? Is there some surface behind the targets what can also reflect light to the sensor?
    I think what is happening is that if the OPT3101 FoV extends past the target then the phase reading is a weighted average of the reflections of the targets plus reflection from objects behind. Then if you change the reflectivity of the target it will of course change the weighting and thus the phase.
    Can you run the test with nothing behind the target and higher amplitude readings?

    Rahland

  • 0 in reply to Rahland Gordon
    Prodigy 30 points

    Hello!

    The low amplitude reading could be caused because I was using an optical cover glass, I'm using a custom hardware, The targets distance are about 1.6m. The targets are the floor, the problem with phase and amplitude is with the chamge of floor material. And there's not a surface behind.

    I have logged a new data set without optical cover glass and these were the results

    This is the data set


    phase, amplitude
6958, 492
6969, 489
6970, 490
6988, 477
6974, 479
6979, 483
6947, 487
6945, 487
6955, 484
6956, 485
6959, 489
6941, 486
6940, 484
6949, 480
7011, 474
6983, 477
6934, 481
6972, 484
6994, 481
6969, 475
7022, 469
6997, 466
6986, 473
6978, 472
7028, 473
6968, 474
6966, 472
6985, 469
6965, 469
6922, 475
6961, 477
6924, 480
6960, 484
6887, 487
6906, 493
6942, 494
6955, 488
6932, 483
6961, 475
6981, 464
7007, 454
7076, 447
7070, 439
7082, 437
7056, 440
7102, 442
7074, 445
7046, 449
7059, 456
7003, 461
7001, 460
6994, 454
7036, 452
7021, 446
7058, 441
7065, 446
7057, 451
7003, 453
7063, 450
7040, 446
7104, 448
7041, 450
7007, 461
7023, 459
7064, 449
7118, 436
7119, 430
7110, 434
7076, 434
7119, 435
7136, 435
7124, 433
7067, 434
7127, 443
6885, 518
6898, 517
6828, 545
6605, 622
6345, 733
6137, 815
6111, 814
6335, 713
6442, 685
6459, 667
6488, 662
6504, 668
6565, 694
6676, 667
6605, 676
6520, 685
6554, 672
6725, 621
6709, 636
6618, 631
6712, 603
6815, 583
6806, 620
6699, 633
6165, 446
5438, 240
5392, 245
5397, 252
5454, 249
5464, 232
5437, 214
5302, 203
5444, 206
5423, 208
5529, 205
5426, 221
5428, 230
5324, 227
5418, 231
5356, 233
5456, 230
5485, 256
5506, 252
5373, 245
5404, 247
5487, 249

  • 0 in reply to Daniel Meneses
    TI__Mastermind 25895 points

    Hi Daniel,

    Can you share a picture of the test setup/targets. There are two situations you are measuring - one with target 1 and one with target 2 - can you share a picture for each of these states?

    Best,

    Alex