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A device and method for measuring refractive index based on self-mixing interference

A technology of self-mixing interference and measurement method, which is applied in the direction of phase influence characteristic measurement, etc., to achieve the effects of large range of refractive index, easy alignment of the device, and low requirements for coordination

Active Publication Date: 2018-01-19
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] But so far, this mobile measurement method based on laser self-mixing interference has not been applied in the field of refractive index measurement

Method used

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  • A device and method for measuring refractive index based on self-mixing interference
  • A device and method for measuring refractive index based on self-mixing interference
  • A device and method for measuring refractive index based on self-mixing interference

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Embodiment 1

[0046] see figure 2 , the present invention discloses a refractive index measurement device based on self-mixing interference, including a laser light source 1, a displacement stage 2, a mirror 3, a signal processing unit 4 and a data processing unit 5, wherein:

[0047]The laser light source 1 is a semiconductor laser, on which a photodiode is integrated, and the photodiode is used to monitor the optical power of the semiconductor laser. Of course, the laser light source 1 can also use other lasers with optical power monitoring function, which is not specifically limited in the present invention.

[0048] The displacement stage 2 adopts a manual translation stage with an indicator or a readable displacement stage, and the measured sample D is placed on the displacement stage 2.

[0049] refer to figure 2 As shown, the mirror 3 is used to reflect the laser light, so that the laser light returns to the laser light source 1 . The laser light source 1 , the sample D to be te...

Embodiment 2

[0056] Cooperate figure 2 and image 3 As shown, the present invention discloses a method for measuring refractive index based on self-mixing interference. The method uses the device for measuring refractive index based on self-mixing interference in Embodiment 1, and is specifically implemented through the following steps:

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Abstract

The invention discloses a refractive index measurement device based on self-mixing interference, which includes a laser light source, a displacement platform, a reflector, a signal processing unit and a data processing unit, the displacement platform is loaded with a sample to be measured, the laser light source, The sample to be tested and the reflector are sequentially connected in an optical path, the input end of the signal processing unit is connected to the laser light source, and the output end is connected to the data processing unit. The invention also discloses a method for measuring the refractive index based on self-mixing interference. The invention does not need auxiliary optical components such as a beam splitter and a reference mirror of a traditional laser interferometer, has a simple and compact structure, low cost, easy alignment of the device, and wide application range.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to a refractive index measurement device and method based on self-mixing interference. Background technique [0002] At present, a lot of work has been done on the measurement of the refractive index of optical glass materials, and many meaningful measurement methods have been proposed. The methods for measuring the refractive index of optical glass materials are mainly divided into two categories: goniometric method and interferometric method. Angle measurement methods include minimum deflection angle method, right-angle collimation method, self-collimation method and V prism refractometer method; interferometric methods are divided into F-P (Fabry-Perot interferometer) interferometric method and immersion method. Optical glass material refractive index measurement accuracy reaches 10 -6 The most important ones are the minimum deflection angle method, the right angle ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/45
Inventor 黄文财陈晨曦张咏冰陈敏亮王晓忠
Owner XIAMEN UNIV
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