Method, device and electronic apparatus for estimating physical parameter by discrete chirp fourier transform

US11156450B2 · kind B2 · utility

Assignee

• Beijing Institute of Technology · CN

Inventors

• Mingfeng LU · Beijing, CN
• Jinmin WU · Beijing, CN
• Kun Xiong · Naperville, US
• Xianggen Xia · Nanhu, CN
• Feng Zhang · Greenbelt, US
• Ran Tao · Amsterdam, NL

Key dates

• Filing date: Jul 29, 2020
• Grant date: Oct 26, 2021
• Expiry date: Jul 29, 2040

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M11/0271
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method, device and electronic apparatus for estimating physical parameters are disclosed. The method includes: reading a Newton's rings fringe pattern obtained by performing an interferometric measurement on a unit to be measured; obtaining the number and length of first-direction signals of the Newton's rings fringe pattern; performing, for each of the first-direction signals, a discrete chirp Fourier transform (DCFT) on the first-direction signal based on each first chirp rate parameter within a range of the length of first-direction signals, to obtain a first magnitude spectrum of an intensity distribution signal in a DCFT domain; determining a first chirp rate parameter and a first frequency parameter corresponding to a first magnitude peak value based on the first magnitude spectrum; and estimating the physical parameters involved in the interferometric measurement at least according to the first chirp rate parameter and first frequency parameter corresponding to the first magnitude peak value. In this way, the physical parameters involved in the interferometric measurement can be estimated with high accuracy and stably.