A micromechanical shock sensor includes a proof mass coupled to a surface of a substrate and a projection element extending laterally from the proof mass. The shock sensor further includes a latch mechanism and a retention anchor. The latch mechanism has a latch spring attached to the surface and a latch tip extending from a movable end of the latch spring. The retention anchor is attached to the surface and is located proximate the latch tip. The proof mass is configured for planar movement relative to the substrate when the proof mass is subjected to a force of at least a threshold magnitude. Movement of the proof mass in response to the force causes the latch tip to become retained between the projection element and the retention anchor to place the shock sensor in a latched state. The latched state may be detected by optical inspection, probe, or external readout.

For generating a diagnosis, a method irradiates a product surface of a product with infrared light, the product surface including a stress sensitive pigment. The method detects an activation of the stress sensitive pigment as a color change at an infrared visible activation location. The method generates a diagnosis based on the activation.