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Method and system for eliminating mirror images using servo system resonance in ss-oct distance measurement

A measurement system and spacing technology, applied in the field of optical measurement, can solve the problems of easy damage and cost, achieve the effects of reducing cost and complexity, stabilizing the results of image elimination, and increasing the range of single measurement

Active Publication Date: 2021-07-13
SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, PZT, as a nanometer-scale high-precision instrument, is vulnerable to damage and high cost.

Method used

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  • Method and system for eliminating mirror images using servo system resonance in ss-oct distance measurement
  • Method and system for eliminating mirror images using servo system resonance in ss-oct distance measurement
  • Method and system for eliminating mirror images using servo system resonance in ss-oct distance measurement

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with the embodiments, so that those skilled in the art can implement it with reference to the description.

[0041] It should be understood that terms such as "having", "comprising" and "including" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0042] A method of using servo motor 8 system resonance image elimination in a kind of SS-OCT distance measurement of the present embodiment includes:

[0043] 1) Construct the anti-image algorithm formula:

[0044] 1-1) The signal detected by the photodetector 11 in the SS-OCT spacing measurement system is described as:

[0045]

[0046]Among them, k is the wave number, S(k) is the broadband light emitted by the light source with k coded with time, R R , R Sn is the reflectivity of the plane mirror 7 on the reference arm 14 and the reflectivity of the nth mirror of the sample on the s...

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Abstract

The present invention discloses a method and system for using servo system resonance to eliminate mirror image in SS-OCT distance measurement. The method of the invention utilizes resonance caused by servo motor to generate phase sinusoidal vibration, and combines an arbitrary phase mirror image elimination algorithm Mirror elimination is achieved. The system of the present invention includes a frequency-sweeping light source, a circulator, a wavelength division multiplexer, an optical fiber coupler, a reference arm, a sample arm, a photodetector, a data acquisition device, and an electronic computer; the optical fiber coupler is a 50 / 50 coupler . The reference arm includes a first collimator, a plane mirror and a servo motor system. The servo motor system includes a servo motor and a transmission device. The servo motor drives the plane mirror to move and generate phase oscillation through the transmission device. The invention does not need to introduce extra PZT into the system, greatly reduces the cost and complexity of the system, and the image elimination result is stable, and the single measurement range of the system is doubled.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to a method and system for eliminating mirror images by using servo system resonance in SS-OCT distance measurement. Background technique [0002] Optical coherence tomography (OCT) is a non-invasive, non-contact imaging technique that can be applied to non-contact measurement of optical surfaces. However, due to the characteristics of the Fourier transform, the actual measurement is affected by the image, and the range is reduced to half. Therefore, if the image can be eliminated, the range can be doubled. [0003] Image elimination was first reported by M.Wojtkowski in the article "Full range complex spectral optical coherence tomography technique in eye imaging" with a five-step phase-shifting method, which calculated the amplitude and phase information of five interference signals to reconstruct the complex interference spectrum; later by Y The linear B-M method pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/14
CPCG01B11/14
Inventor 史国华王俊翔冯长有邢利娜王冬月潘道伟樊金宇
Owner SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI