Systems and methods for vibration control

A system for vibration control, the system comprising:

• a cryocooler configured to cool an imager based on a drive waveform,
• a vibration sensor physically affixed to the cryocooler, the vibration sensor configured to sense a physical vibration of the cryocooler and to generate a vibration signal therefrom, and
• cryocooler drive electronics operatively coupled to the vibration sensor and the cryocooler, the cryocooler drive electronics configured to output the drive waveform to drive the cryocooler so as to reduce the vibration impact of the cryocooler, wherein the harmonic content of the cryocooler drive waveform is controlled based on the vibration signal, and wherein the cryocooler drive electronics includes a single field-programmable-gate array configured to determine the drive waveform by executing the following sequence entirely within the field-programmable-gate array:
• (a) set a start point for each harmonic to a neutral point,
• (b) for a current harmonic, generate a phase-amplitude matrix based on an initial start point, an amplitude step size and a phase step size, wherein the phase-amplitude matrix consists of a plurality of phase-amplitude points, each corresponding to a phase-amplitude measurement indicated by the vibration signal,
• (c) determine which of the phase-amplitude points has the lowest vibration signal level based on sampling the phase-amplitude matrix from the start point,
• (d) set the start point for the current harmonic to the phase-amplitude points having the lowest vibration signal level,
• (e) reduce the amplitude step size and the phase step size,
• (f) increase the current harmonic number and return to (b) until the current harmonic is greater than a specified maximum harmonic, and
• (g) execute a dithering routine having a preset dithering step size.