Methods and apparatus for removing cyclic noise from the output

Details Methods and apparatus for removing cyclic noise from the output Methods and apparatus for removing cyclic noise from the output

1993-06-04

1994-09-06

Wayner, William E.

Refrigeration

Gas compression, heat regeneration and expansion, e.g.,...

62 491, 324248, F25B 900

Patent

active

053437071

ABSTRACT:
A cyclic noise removing method first generates a template of a cyclic noise caused by a cryogenic refrigerator, which template is generated by arithmetically averaging the output signal from a magnetic sensor by every vibration cycle of the cryogenic refrigerator, the magnetic sensor being cooled by the cryogenic refrigerator, then removes noise included in the output signal of the magnetic sensor by subtracting the template from the output signal of the magnetic sensor.

REFERENCES:
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patent: 5173659 (1992-12-01), Chiba et al.
patent: 5193348 (1993-03-01), Schnapper
Yoshida, T., et al., "MCG Measurements with a Squid cooled by a Cryocooler", published on Jun. 5, 1992 for a Japanese academy society related to the study of the body and magnetism, in vol. 5, No. 1 of a collection of articles by the society.
Sata, K., et al. "Biomagnetic Measurements with a SQUID cooled by a GM/JT Cryocooler" for Daikin Industries, Ltd. Aug. 1991.
Kang, Myung-Yoon et al., "4 K GM/JT Cryocooler for Cryogenic Sensors" for Daikin Industries, Ltd. Oct. 25, 1990.
Sata, Ken-ichi et al., "Study of SQUID Cooling by GM/JT Cryocooler" is identified as article B3-15 Dec. 1989.
Sata, Ken-ichi et al., "Study of SQUID Cooling by GM/JT Crycooler" is identified as article D2-17 Nov. 1990.
Sata, Ken-ichi et al., "Study of SQUID Cooling by GM/JT Cryocooler" is identified as article E1-18.

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