Question:

If this new detector does not have a light to show movement, is there a chashash of a Shabat transgression when walked in front of it?

Answer:

Since you do not care about whether or not your motion is detected and it is non a certainty that you are always close enough for it to operate, therefore  it is not a problem.

Sources:

O:CH 320:18 & 336:3 & Mishnah Berurah 24

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