# US 2018/0362192 A1 · Systems and Methods for Vibration Control

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- Number: US 2018/0362192 A1
- Document ID: US20180362192A1
- Status: Published application
- Kind: A1
- Application number: 16/009,058
- Filed: 2018-06-14
- Published: 2018-12-20
- Earliest claimed: 2017-06-16
- Assignees: Iris Technology Corporation
- Applicants: Iris Technology Corporation
- Inventors: Tal KIANI; Edgar Moody
- Web page: https://patentgrep.com/patent/US20180362192A1

## CPC

- B64G 1/38: damping of oscillations, e.g. nutation dampers
- B64G 1/228: {Damping of high-frequency vibration effects on spacecraft elements, e.g. by using acoustic vibration dampers}
- B64G 1/50: for temperature control
- B64G 1/66: Arrangements or adaptations of apparatus or instruments, not otherwise provided for
- F16F 7/1011: {by electromagnetic means}
- F16F 15/02: Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems ({F16F15/005 takes precedence } ; layered products B32B; suppression of vibration in ships B63; {relieving load on bearings, using magnetic means F16C39/06})
- F25B 9/14: characterised by the cycle used, e.g. Stirling cycle
- F25B 25/005: {using primary and secondary systems}
- F25B 49/00: Arrangement or mounting of control or safety devices
- G02B 27/646: {compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68)}
- F25B 2500/13: Vibrations
- F25B 2500/19: Calculation of parameters
- G03B 15/006: {Apparatus mounted on flying objects}
- G03B 17/55: with provision for heating or cooling, e.g. in aircraft
- G03B 17/561: {Support related camera accessories}
- B64G: COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

A system for vibration control of a cryocooler that cools an imager. The system includes a vibration sensor that is physically affixed to the cryocooler. The vibration sensor senses a physical vibration of the cryocooler and to generates a vibration signal therefrom. The system also includes cryocooler drive electronics operatively coupled to the vibration sensor and the cryocooler. The cryocooler drive electronics output a drive waveform that drives the cryocooler so as to reduce the vibration impact of the cryocooler. The harmonic content of the cryocooler drive waveform is controlled by the cryocooler drive electronics based on the vibration signal.

## Claims

### Claim 1

A system for vibration control, the system comprising:
a cryocooler configured to cool an imager,
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 a 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.

### Claim 2 (depends on 1)

The system of claim 1, wherein the imager is a focal plane array imager.

### Claim 3 (depends on 1)

The system of claim 1, wherein the cryocooler is configured to cool electronics associated with the imager.

### Claim 4 (depends on 1)

The system of claim 1, wherein the cryocooler includes a cold head and a compressor.

### Claim 5 (depends on 1)

The system of claim 1, wherein the cryocooler drive electronics includes at least one field-programmable-gate array. The system of claim 1, wherein the cryocooler drive electronics are configured to operate the cryocooler to cool the imager in accordance with a temperature control process.

### Claim 6 (depends on 1)

The system of claim 1, wherein the cryocooler includes a compressor, and the

### Claim 7 (depends on 1)

The system of claim 1, wherein the cryocooler drive electronics are configured to discrete Fourier transform the vibration signal according to a specified harmonic number.

### Claim 8 (depends on 1)

The system of claim 1, wherein the cryocooler drive electronics are configured to:
set a start point for each harmonic to a neutral point;
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; and
determine which of the phase-amplitude points has the lowest vibration signal level based on sampling the phase-amplitude matrix from the start point;
set the start point for the current harmonic to the phase-amplitude points having the lowest vibration signal level;
reduce the amplitude step size and the phase step size;
increase the current harmonic number.

### Claim 9 (depends on 8)

The system of claim 8, wherein the cryocooler drive electronics are further configured to: execute a dithering routine.