I was wondering which is the difference or in which is recommended use case for each example: ADPD188BIZ-SK_EVAL_SMOKE_chop_01.dcfg and ADPD188BIZ-SK_TEST_SMOKE_OpenAir_01.dcf
for the Chop example, I notice it has a lower sample frequency and more consumption in LEDs, 4 pulses sequence and it uses an integrator for the photodiode signal (chop)
for the OpenAir example higher sample frequency and lower consumption in LEDs, 8 pulses sequence
Which are the benefits of using one or another regarding smoke detection? because of both returns differents PTR values for the same smoke exposition
Chop mode will eliminate any inherent offsets to the device so that with no input response the output of the device will automatically be nulled to ~0 codes. If not using chop mode then the user needs to take care of nulling the device offset. However, this is a process that needs to take place anyways since once the device is set up and operating with a smoke chamber or some other background that gives a response, this background response must be nulled out so that only a response to aerosol in the optical path will be considered when applying alarm thresholds. Once this background cancellation is performed, it doesn't matter if you're in chop mode or not, the PTR of the aerosol will be the same.
Also, keep in mind that when using chop mode you have to use an even number of pulses.
Hi Buckley thanks for the detailed reply, the reason I am getting different values in the PTR could be related In chop mode I am using the LEDs with 0.1 Scale? and when not in chop mode the LEDs are in full scale 1