PIR sensor orientation

[Aaron]

I was reading about PIR sensors and how they work. I came across this image and found it quite useful.




If I understand it right, because you have to move across the detection area from left to right or vice versa, detecting motion coming straight at the sensor is difficult.

Here's a question for the tech guys: if the camera had dual PIR sensors, one in the horizontal orientation and a second in vertical orientation, would that solve the problem of direct approach to the camera?

[Crimp On_62210811129]

My guess is "no" and that PIR sensors already detect objects moving "up or down". It is the "straight on" issue that PIR cannot handle.
PIR sensors are a standard, ma*s produced module that seems to be "it does what it does, takes almost no power, and is cheap."