A tab or label for shipping containers containing four proximity sensors will be developed which will detect and record the time and a signature of visitors. The thin-film sensors are on surface of a flexible strip (30 cm x 3 cm) which is affixed to the container side. The four sensors are passive infrared (PIR), E-field, capacitance and RF/microwave which can detect the presence of people in the vicinity. The E-field/capacitance and microwave are metalized areas while the PIR is a thin pyro-electric plastic film on the surface. The PIR is sensitive to the heat of a human while the E-field and capacitance are sensitive to the charge of the approaching object. The microwave Doppler sensor is able to detect the heartbeat at a distance which provides a personal signature. The reflected microwave signal is analyzed to extract the heart beat as an identification signature. An internal clock allows the time and duration of the visitor (or intrusion), along with a signature and other parameters, to be recorded in a flash memory. The data can be retrieved at a later time via a Bluetooth wireless to a smart phone or remotely.
