The ‘L’ in LDT stands for ‘laminated’ sensor. Typically, a0.005” (125µm) polyester layer is laminated to a 28 µm or 52µm piezo filmelement. When used in a ‘bending’ mode, laminated film elements develop muchhigher voltage output when flexed than a non-laminated DT elements series. Theneutral axis is in the laminate instead of in the film so the film is strainedmore when flexed.
Applications for this include beam-type vibration sensorsfor vehicle alarms and solid state switches for counters and momentary closuretype switches.