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Vikas,
The Developer's Guide for the Vital Signs Lab addresses several of your questions under the "Limitations of the Current Demo" section.
The sensor should be placed directly in the line of sight of the target individual. This can be either in front of the person or from behind.
As stated in the Developer's Guide, "the user has to be relatively still for at least 10-15 seconds for the demo to effectively work."
This lab was developed and tested in a stationary environment. This demo was not designed for use in a moving vehicle.
Since the sensor is placed in the direct line of sight of the sensor, the last question becomes irrelevant.
Please refer to the documentation provided in the docs folder for more information.
Regards,
Kyle