Patent ID: 8307708

Claim:
A radio frequency identification (RFID) based thermal bubble type accelerometer, comprising: a flexible substrate having a substrate surface parallel to a plane defined by x and y axes in a mutually orthogonal xyz coordinate system; an embedded system on chip (SOC) unit disposed on the flexible substrate, having a modulation/demodulation module; an RFID antenna formed on the flexible substrate, coupled to the modulation/demodulation module; at least one first cavity formed on the substrate surface; and a plurality of first sensing assemblies disposed along a direction parallel to the x-axis direction and suspended over the at least one first cavity, each first sensing assembly including a first heater and two first temperature-sensing elements, the first heater and the two first temperature-sensing elements being arranged in parallel to the x-axis direction, wherein the two first temperature-sensing elements of each first sensing assembly are connected in series, and disposed opposite to and substantially equidistant from the first heater; wherein a series-connecting point of the two first temperature-sensing elements of each first sensing assembly is coupled to the embedded SOC unit, and the embedded SOC unit can obtain an x-axis acceleration signal based on a voltage difference across two of the series-connecting points of the first sensing assemblies, and the x-axis acceleration signal is modulated and coded by the modulation/demodulation module and is sent using the RFID antenna.