The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 26, 2017
Filed:
Jun. 25, 2013
Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing, CN;
Shihai Yang, Nanjing, CN;
Abstract
A large-caliber telescope non-linear interference detecting and filtering method is provided. The measure of the oil pad interference is accomplished with one of the following two methods, accelerometer and encoder, or using both of the said methods simultaneously. The filtering of the oil pad interference: set a NOTCH frequency as the main interfering frequency by using NOTCH filter to filter the interference and distinctly improve the telescope performance. The telescope and method is specific to a large-caliber telescope with an oil pad, by using an acceleration sensor and an encoder to precisely measure the non-linear interfering frequency of the telescope oil pad system, by using a NOTCH digital filter to accurately filter the interference due to the oil pad system, and through adjusting parameters of the digital filter to change the filter frequency band on the basis of the change of the oil pad interfering frequency.