How about the microwave method. How does that work?

How about the microwave method. How does that work?

It uses a second Doppler pulse and detects the action of masking, I.e the hand and person with the object in close proximity to the detector. Still can pass the required tests, but not the best method IMHO. Cheaper to manufacture of course has less components and firmware required.

But can cause issues when fitted above a door with a mic fa cause

It uses a second Doppler pulse and detects the action of masking, I.e the hand and person with the object in close proximity to the detector. Still can pass the required tests, but not the best method IMHO. Cheaper to manufacture of course has less components and firmware required.

I see

Pyronix use microwave. The range is adjustable from zero to about one meter. Once an object or mist from a spray gets that close we start a hunt mode. Nothing for 20 seconds (allow polish to dry) then for 40 seconds we look for movement on both parts of the DT. If detected, no fault. If one or other does not see movement, we show the fault. The fault can be cleared by activating the detector proving both parts are now not blocked.

This method protects both the IR an the MW from being blocked.