Patent ID: H002265

Claim:
A differential variable reluctance transducer (DVRT) for measuring a translation parameter of a neighboring component in a high-acceleration environment, the DVRT comprising: a cylindrical housing that defines a cavity containing a bobbin substantially collinear with the housing, a wire coil helically disposed around the bobbin, an insulation otherwise filling the cavity, the housing having a distal end and an attachment end; a membrane that covers the distal end of the housing; an electronics module for receiving an electric signal from the wire coil, the electronics module terminating in an electrical connector to a data recorder; and a cable connecting the housing to the electronics module, wherein the electronics module provides a direct current (DC) output and comprises: a frequency selector including a resistance and capacitor connected in parallel to a selection input; a signal oscillator that receives the selection input from the frequency selector to produce a signal input; an inductance-resistance Wheatstone bridge that receives the signal input from the signal oscillator at a junction tap of an inductor pair; a demodulator that receives calibration and measurement signals from the Wheatstone bridge; and a DC amplifier that receives and differences the calibration and measurement signals and that sends the electronic signal as the DC output.