Detection of polyethylene and silicon or other material combinations used in motion sensors or other devices

A system comprising:

• at least one optical source configured to generate first optical energy for transmission towards a space being scanned;
• at least one receiver configured to receive first return optical energy, the first return optical energy based on the transmitted first optical energy;
• and
• at least one processor configured to detect one or more instances of a first material in the space using the first return optical energy;
• wherein, for each of the one or more instances of the first material, the at least one optical source is configured to generate second optical energy for transmission towards a portion of the space in which the instance of the first material was detected;
• wherein the at least one receiver is configured to receive second return optical energy, the second return optical energy based on the transmitted second optical energy;
• and
• wherein the at least one processor is configured to:
• detect one or more instances of a second material in the space using second return optical energy;
• and
• identify a presence of at least one type of device in the space based on instances of the first and second materials detected in the space.

A non-transitory computer readable medium comprising instructions that when executed cause at least one processor to:

• initiate transmission of first optical energy towards a space being scanned;
• detect one or more instances of a first material in the space using first return optical energy, the first return optical energy based on the transmitted first optical energy;
• for each of the one or more instances of the first material, initiate transmission of second optical energy towards a portion of the space in which the instance of the first material was detected;
• detect one or more instances of a second material in the space using second return optical energy, the second return optical energy based on the transmitted second optical energy;
• and
• identify a presence of at least one type of device in the space based on instances of the first and second materials detected in the space.