US 11,835,279 B2
Noise reduction method
Anthony J. Matthews, Abingdon (GB); Mark Patton, Abingdon (GB); and Jeremy White, Abingdon (GB)
Assigned to Oxford Instruments Nanotechnology Tools Limited, Oxon (GB)
Appl. No. 17/266,664
Filed by OXFORD INSTRUMENTS NANOTECHNOLOGY TOOLS LIMITED, Abingdon (GB)
PCT Filed Aug. 7, 2019, PCT No. PCT/GB2019/052219
§ 371(c)(1), (2) Date Feb. 8, 2021,
PCT Pub. No. WO2020/030910, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. 1812894 (GB), filed on Aug. 8, 2018.
Prior Publication US 2021/0310710 A1, Oct. 7, 2021
Int. Cl. F25B 49/02 (2006.01); F25B 9/14 (2006.01)
CPC F25B 49/022 (2013.01) [F25B 9/145 (2013.01); F25B 2309/1427 (2013.01); F25B 2500/12 (2013.01); F25B 2500/13 (2013.01); F25B 2600/0253 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of reducing noise in a cryogenic cooling system, the method comprising:
monitoring vibrations in the cryogenic cooling system during operation of only a single mechanical refrigerator;
measuring vibration amplitudes in the monitored vibrations;
determining transfer functions and structural resonance coupling for the cryogenic cooling system based on the measured vibration amplitudes; and
modulating an operating frequency of the mechanical refrigerator based on the determined transfer functions and structural resonance coupling so as to reduce the vibration amplitudes of the monitored vibrations.