METHODS AND APPARATUS FOR IMPROVED SENSOR VIBRATION CANCELLATION

摘要

Infrared sensing systems having improved vibration cancelation, and methods of achieving improved vibration cancelation. In one example, an infrared sensing system includes an infrared sensor configured to produce a sensor output signal representative of a response of the infrared sensor to infrared excitation and vibration excitation, an accelerometer configured to provide an acceleration signal responsive to the vibration excitation, and a controller, including an adaptive digital filter, coupled to the infrared sensor and to the accelerometer, and configured to receive the acceleration signal and to adjust coefficients of the adaptive digital filter so as to minimize coherence between a residual signal and the acceleration signal, the residual signal being a difference between the sensor output signal and a filter output signal from the adaptive digital filter.

主权项

1. An infrared (IR) sensing system comprising:
an IR sensor configured to produce a sensor output signal representative of a response of the IR sensor to an IR signature of interest and vibration excitation; a reference sensor configured to provide a reference signal responsive to the vibration excitation; and a controller, including an adaptive digital filter, coupled to the IR sensor and to the reference sensor, and configured to receive the reference signal and to adjust coefficients of the adaptive digital filter so as to minimize coherence between a residual signal and the reference signal, the residual signal being a difference between the sensor output signal and a filter output signal from the adaptive digital filter.