DLPNIRSCANEVM: Scandata

Hello Hong,

Please let us look into this and we plan to get back to you this week.

Thanks,

Kyle

Hi Hirak,

I found a scanData structure inside the dlp_scan_interpret() function, which defines an int32_t adc_data[ADC_DATA_LEN]. Excuse me, is the ADC sampling value after scanning stored in this array?Is that 8 bytes for a sampling wavelength?

Thanks & Regards,

Hong.

Hi Hirak,

After a lot of debugging, I am a bit suspicious about my data. Hirak, can you provide me with a test data?

Thanks & Regards,

Hong.

Hi Hirak,

I found the code for calculating the light intensity in the DLP Spectrum Library, but I don't understand it very well. Could you please explain to me in detail how to calculate the light intensity through sampling data? or give me a document about it.

Thanks & Regards,

Hong.

Hi Hirak,

I've got the raw ADC value,and here's the code

    /* Compute DC detector level during black patterns */
    for(i=0; i<pScanData->adc_data_length; i++)
 {
        if((i-pattern_first)%pattern_period == 0)
        {
      dc_level += pScanData->adc_data[i];
      num_black_patterns++;
        }
 }
 if(num_black_patterns > 0)
  dc_level /= num_black_patterns;

    /* Subtract found DC detector level from remaining measurements */
    for(res_idx=0, scan_idx=0; scan_idx < pScanData->adc_data_length;)
 {
  if((scan_idx-pScanData->black_pattern_first)
    %pScanData->black_pattern_period == 0)
  {
   scan_idx++; //skip this adc_data (black level)
  }
  else
  {
   pResults->intensity[res_idx] = pScanData->adc_data[scan_idx++] - dc_level;
   res_idx++;
  }
 }

This is how we calculate the intensity of the light by adc_data,but I don't know why we do that.

Can you give me some inspiration?

Thanks & Regards,

Hong.

Thank you Vivek, it's very useful for me.