Patent ID: 7377171

Claim:
A transducer for measuring vibrations which is capable of compensating for changes in the transducer's output voltage caused by radiation exposure, the transducer comprising: an accelerometer for generating acceleration signals in response to vibrations, an integrator for generating velocity signals by integrating the acceleration signals output by the accelerometer, the integrator comprising: an amplifier, an alternating current (“AC”) feedback circuit for integrating the acceleration signals input to the amplifier, and a direct current (“DC”) feedback circuit for biasing the amplifier to produce a predetermined output voltage, the DC feedback circuit including a feedback resistor having a predetermined value selected to reduce by a predetermined amount changes in the output voltage of the amplifier due to increases in gate current into the amplifier resulting from the amplifier being exposed to radiation, the AC feed back circuit including a voltage divider circuit formed by first and second resistors, the voltage divider circuit applying a predetermined percentage of feedback voltage to the feedback resistor that causes the feedback resistor to have an effect in the AC feedback circuit as if the value of the feedback resistor were a predetermined multiple of the feedback resistor's actual value.