MAPS Sensor

MAP sensor - Wikipedia, the free encyclopedia

Clearly (see post #1) there are multiple definitions of MAPS (and MAPS sensor).

Below are some quotes from a .pdf that at least confirms the existence of the MAPS sensor you are seeking. Perhaps it is more of a customized / home built sensor (i.e., not commercially available), or maybe you will have some success googling for [AEA Technology MAPS].

from Magnetic Methods for Stress Measurement:

All ferromagnetic materials can be examined, including ferritic steel, cast iron, tool steel, some stainless steels and nickel super-alloys.

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CASE STUDY - RESIDUAL STRESSES IN A SECTION OF TRAIN RAIL.

MAPS was used to make the following stress maps from a section of train rail.

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MAPS (Magnetic Anisotropy and Permeability System). This equipment is shown above. Spatial resolution: 5.2 and 15.5 mm, depending on probe type, to a depth of 0.1 to 5 mm.

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Both are AEA Technology instruments. MAPS is a quick method, requiring under 2 minutes to make a bi-axial stress measurement, and is also a portable system. Marsh and Barkhausen noise are laboratory based techniques.